ARMConstantIslandPass.cpp revision 00a6a1f0225b01229134ecee7a853be638703c36
1a8e2989ece6dc46df59b0768184028257f913843Evan Cheng//===-- ARMConstantIslandPass.cpp - ARM constant islands --------*- C++ -*-===// 2a8e2989ece6dc46df59b0768184028257f913843Evan Cheng// 3a8e2989ece6dc46df59b0768184028257f913843Evan Cheng// The LLVM Compiler Infrastructure 4a8e2989ece6dc46df59b0768184028257f913843Evan Cheng// 54ee451de366474b9c228b4e5fa573795a715216dChris Lattner// This file is distributed under the University of Illinois Open Source 64ee451de366474b9c228b4e5fa573795a715216dChris Lattner// License. See LICENSE.TXT for details. 7a8e2989ece6dc46df59b0768184028257f913843Evan Cheng// 8a8e2989ece6dc46df59b0768184028257f913843Evan Cheng//===----------------------------------------------------------------------===// 9a8e2989ece6dc46df59b0768184028257f913843Evan Cheng// 10a8e2989ece6dc46df59b0768184028257f913843Evan Cheng// This file contains a pass that splits the constant pool up into 'islands' 11a8e2989ece6dc46df59b0768184028257f913843Evan Cheng// which are scattered through-out the function. This is required due to the 12a8e2989ece6dc46df59b0768184028257f913843Evan Cheng// limited pc-relative displacements that ARM has. 13a8e2989ece6dc46df59b0768184028257f913843Evan Cheng// 14a8e2989ece6dc46df59b0768184028257f913843Evan Cheng//===----------------------------------------------------------------------===// 15a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 16a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#define DEBUG_TYPE "arm-cp-islands" 17a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#include "ARM.h" 18d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng#include "ARMAddressingModes.h" 19af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng#include "ARMMachineFunctionInfo.h" 20a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#include "ARMInstrInfo.h" 21a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#include "llvm/CodeGen/MachineConstantPool.h" 22a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#include "llvm/CodeGen/MachineFunctionPass.h" 23a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#include "llvm/CodeGen/MachineInstrBuilder.h" 245657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng#include "llvm/CodeGen/MachineJumpTableInfo.h" 25a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#include "llvm/Target/TargetData.h" 26a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#include "llvm/Target/TargetMachine.h" 27a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#include "llvm/Support/Debug.h" 28c25e7581b9b8088910da31702d4ca21c4734c6d7Torok Edwin#include "llvm/Support/ErrorHandling.h" 29705e07f578e2b3af47ddab610feb4e7f2d3063a5Chris Lattner#include "llvm/Support/raw_ostream.h" 30b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson#include "llvm/ADT/SmallSet.h" 31c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng#include "llvm/ADT/SmallVector.h" 32a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#include "llvm/ADT/STLExtras.h" 33a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#include "llvm/ADT/Statistic.h" 341fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach#include "llvm/Support/CommandLine.h" 35b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson#include <algorithm> 36a8e2989ece6dc46df59b0768184028257f913843Evan Chengusing namespace llvm; 37a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 38a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan ChengSTATISTIC(NumCPEs, "Number of constpool entries"); 39a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan ChengSTATISTIC(NumSplit, "Number of uncond branches inserted"); 40a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan ChengSTATISTIC(NumCBrFixed, "Number of cond branches fixed"); 41a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan ChengSTATISTIC(NumUBrFixed, "Number of uncond branches fixed"); 42a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan ChengSTATISTIC(NumTBs, "Number of table branches generated"); 43a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan ChengSTATISTIC(NumT2CPShrunk, "Number of Thumb2 constantpool instructions shrunk"); 4431b99dd76035067b1c3cc6c7e9d663b7b0210938Evan ChengSTATISTIC(NumT2BrShrunk, "Number of Thumb2 immediate branches shrunk"); 45de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan ChengSTATISTIC(NumCBZ, "Number of CBZ / CBNZ formed"); 461fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim GrosbachSTATISTIC(NumJTMoved, "Number of jump table destination blocks moved"); 4780697d1b266cd3cd3b92edd424d66d573db6b4b1Jim GrosbachSTATISTIC(NumJTInserted, "Number of jump table intermediate blocks inserted"); 481fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach 491fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach 501fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbachstatic cl::opt<bool> 511fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim GrosbachAdjustJumpTableBlocks("arm-adjust-jump-tables", cl::Hidden, cl::init(false), 521fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach cl::desc("Adjust basic block layout to better use TB[BH]")); 53a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 54a8e2989ece6dc46df59b0768184028257f913843Evan Chengnamespace { 5588e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen /// ARMConstantIslands - Due to limited PC-relative displacements, ARM 56a8e2989ece6dc46df59b0768184028257f913843Evan Cheng /// requires constant pool entries to be scattered among the instructions 57a8e2989ece6dc46df59b0768184028257f913843Evan Cheng /// inside a function. To do this, it completely ignores the normal LLVM 5888e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen /// constant pool; instead, it places constants wherever it feels like with 59a8e2989ece6dc46df59b0768184028257f913843Evan Cheng /// special instructions. 60a8e2989ece6dc46df59b0768184028257f913843Evan Cheng /// 61a8e2989ece6dc46df59b0768184028257f913843Evan Cheng /// The terminology used in this pass includes: 62a8e2989ece6dc46df59b0768184028257f913843Evan Cheng /// Islands - Clumps of constants placed in the function. 63a8e2989ece6dc46df59b0768184028257f913843Evan Cheng /// Water - Potential places where an island could be formed. 64a8e2989ece6dc46df59b0768184028257f913843Evan Cheng /// CPE - A constant pool entry that has been placed somewhere, which 65a8e2989ece6dc46df59b0768184028257f913843Evan Cheng /// tracks a list of users. 666726b6d75a8b679068a58cb954ba97cf9d1690baNick Lewycky class ARMConstantIslands : public MachineFunctionPass { 67a8e2989ece6dc46df59b0768184028257f913843Evan Cheng /// BBSizes - The size of each MachineBasicBlock in bytes of code, indexed 688593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen /// by MBB Number. The two-byte pads required for Thumb alignment are 698593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen /// counted as part of the following block (i.e., the offset and size for 708593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen /// a padded block will both be ==2 mod 4). 71e03cff6812ac41598e2bca7854985dc821a07f44Evan Cheng std::vector<unsigned> BBSizes; 728494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 7399c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen /// BBOffsets - the offset of each MBB in bytes, starting from 0. 748593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen /// The two-byte pads required for Thumb alignment are counted as part of 758593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen /// the following block. 7699c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen std::vector<unsigned> BBOffsets; 7799c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen 78a8e2989ece6dc46df59b0768184028257f913843Evan Cheng /// WaterList - A sorted list of basic blocks where islands could be placed 79a8e2989ece6dc46df59b0768184028257f913843Evan Cheng /// (i.e. blocks that don't fall through to the following block, due 80a8e2989ece6dc46df59b0768184028257f913843Evan Cheng /// to a return, unreachable, or unconditional branch). 81e03cff6812ac41598e2bca7854985dc821a07f44Evan Cheng std::vector<MachineBasicBlock*> WaterList; 82c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng 83b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson /// NewWaterList - The subset of WaterList that was created since the 84b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson /// previous iteration by inserting unconditional branches. 85b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson SmallSet<MachineBasicBlock*, 4> NewWaterList; 86b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson 87034de5f65f9139954cb01d94eaebbaefd294946eBob Wilson typedef std::vector<MachineBasicBlock*>::iterator water_iterator; 88034de5f65f9139954cb01d94eaebbaefd294946eBob Wilson 89a8e2989ece6dc46df59b0768184028257f913843Evan Cheng /// CPUser - One user of a constant pool, keeping the machine instruction 90a8e2989ece6dc46df59b0768184028257f913843Evan Cheng /// pointer, the constant pool being referenced, and the max displacement 91549dda9d82a5ec0a0cbf429a18d33a8e66062424Bob Wilson /// allowed from the instruction to the CP. The HighWaterMark records the 92549dda9d82a5ec0a0cbf429a18d33a8e66062424Bob Wilson /// highest basic block where a new CPEntry can be placed. To ensure this 93549dda9d82a5ec0a0cbf429a18d33a8e66062424Bob Wilson /// pass terminates, the CP entries are initially placed at the end of the 94549dda9d82a5ec0a0cbf429a18d33a8e66062424Bob Wilson /// function and then move monotonically to lower addresses. The 95549dda9d82a5ec0a0cbf429a18d33a8e66062424Bob Wilson /// exception to this rule is when the current CP entry for a particular 96549dda9d82a5ec0a0cbf429a18d33a8e66062424Bob Wilson /// CPUser is out of range, but there is another CP entry for the same 97549dda9d82a5ec0a0cbf429a18d33a8e66062424Bob Wilson /// constant value in range. We want to use the existing in-range CP 98549dda9d82a5ec0a0cbf429a18d33a8e66062424Bob Wilson /// entry, but if it later moves out of range, the search for new water 99549dda9d82a5ec0a0cbf429a18d33a8e66062424Bob Wilson /// should resume where it left off. The HighWaterMark is used to record 100549dda9d82a5ec0a0cbf429a18d33a8e66062424Bob Wilson /// that point. 101a8e2989ece6dc46df59b0768184028257f913843Evan Cheng struct CPUser { 102a8e2989ece6dc46df59b0768184028257f913843Evan Cheng MachineInstr *MI; 103a8e2989ece6dc46df59b0768184028257f913843Evan Cheng MachineInstr *CPEMI; 104549dda9d82a5ec0a0cbf429a18d33a8e66062424Bob Wilson MachineBasicBlock *HighWaterMark; 105a8e2989ece6dc46df59b0768184028257f913843Evan Cheng unsigned MaxDisp; 1065d8f1cae76e4e424bf3b4392eddb3f4dbf38662aEvan Cheng bool NegOk; 107d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng bool IsSoImm; 108d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng CPUser(MachineInstr *mi, MachineInstr *cpemi, unsigned maxdisp, 109d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng bool neg, bool soimm) 110549dda9d82a5ec0a0cbf429a18d33a8e66062424Bob Wilson : MI(mi), CPEMI(cpemi), MaxDisp(maxdisp), NegOk(neg), IsSoImm(soimm) { 111549dda9d82a5ec0a0cbf429a18d33a8e66062424Bob Wilson HighWaterMark = CPEMI->getParent(); 112549dda9d82a5ec0a0cbf429a18d33a8e66062424Bob Wilson } 113a8e2989ece6dc46df59b0768184028257f913843Evan Cheng }; 1148494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 115a8e2989ece6dc46df59b0768184028257f913843Evan Cheng /// CPUsers - Keep track of all of the machine instructions that use various 116a8e2989ece6dc46df59b0768184028257f913843Evan Cheng /// constant pools and their max displacement. 117e03cff6812ac41598e2bca7854985dc821a07f44Evan Cheng std::vector<CPUser> CPUsers; 1188494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 119c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng /// CPEntry - One per constant pool entry, keeping the machine instruction 120c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng /// pointer, the constpool index, and the number of CPUser's which 121c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng /// reference this entry. 122c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng struct CPEntry { 123c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng MachineInstr *CPEMI; 124c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng unsigned CPI; 125c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng unsigned RefCount; 126c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng CPEntry(MachineInstr *cpemi, unsigned cpi, unsigned rc = 0) 127c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng : CPEMI(cpemi), CPI(cpi), RefCount(rc) {} 128c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng }; 129c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng 130c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng /// CPEntries - Keep track of all of the constant pool entry machine 13188e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen /// instructions. For each original constpool index (i.e. those that 13288e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen /// existed upon entry to this pass), it keeps a vector of entries. 13388e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen /// Original elements are cloned as we go along; the clones are 13488e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen /// put in the vector of the original element, but have distinct CPIs. 135c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng std::vector<std::vector<CPEntry> > CPEntries; 1368494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 137af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng /// ImmBranch - One per immediate branch, keeping the machine instruction 138af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng /// pointer, conditional or unconditional, the max displacement, 139af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng /// and (if isCond is true) the corresponding unconditional branch 140af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng /// opcode. 141af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng struct ImmBranch { 142af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng MachineInstr *MI; 143c285414988ba026d01e5d8acc07a21cd06fd5732Evan Cheng unsigned MaxDisp : 31; 144c285414988ba026d01e5d8acc07a21cd06fd5732Evan Cheng bool isCond : 1; 145af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng int UncondBr; 146c285414988ba026d01e5d8acc07a21cd06fd5732Evan Cheng ImmBranch(MachineInstr *mi, unsigned maxdisp, bool cond, int ubr) 147c285414988ba026d01e5d8acc07a21cd06fd5732Evan Cheng : MI(mi), MaxDisp(maxdisp), isCond(cond), UncondBr(ubr) {} 148af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng }; 149af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng 1502706f9771de8e90ee6379e70afedd91892bb9c8cEvan Cheng /// ImmBranches - Keep track of all the immediate branch instructions. 151af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng /// 152e03cff6812ac41598e2bca7854985dc821a07f44Evan Cheng std::vector<ImmBranch> ImmBranches; 153af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng 154d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng /// PushPopMIs - Keep track of all the Thumb push / pop instructions. 155d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng /// 156c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng SmallVector<MachineInstr*, 4> PushPopMIs; 157d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng 1585657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng /// T2JumpTables - Keep track of all the Thumb2 jumptable instructions. 1595657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng SmallVector<MachineInstr*, 4> T2JumpTables; 1605657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng 161d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng /// HasFarJump - True if any far jump instruction has been emitted during 162d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng /// the branch fix up pass. 163d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng bool HasFarJump; 164d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng 165a8e2989ece6dc46df59b0768184028257f913843Evan Cheng const TargetInstrInfo *TII; 16625f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng const ARMSubtarget *STI; 1678593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen ARMFunctionInfo *AFI; 168b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen bool isThumb; 169d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng bool isThumb1; 1705e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin bool isThumb2; 171a8e2989ece6dc46df59b0768184028257f913843Evan Cheng public: 1721997473cf72957d0e70322e2fe6fe2ab141c58a6Devang Patel static char ID; 173ae73dc1448d25b02cabc7c64c86c64371453dda8Dan Gohman ARMConstantIslands() : MachineFunctionPass(&ID) {} 174794fd75c67a2cdc128d67342c6d88a504d186896Devang Patel 1755657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng virtual bool runOnMachineFunction(MachineFunction &MF); 176a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 177a8e2989ece6dc46df59b0768184028257f913843Evan Cheng virtual const char *getPassName() const { 178af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng return "ARM constant island placement and branch shortening pass"; 179a8e2989ece6dc46df59b0768184028257f913843Evan Cheng } 1808494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 181a8e2989ece6dc46df59b0768184028257f913843Evan Cheng private: 1825657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng void DoInitialPlacement(MachineFunction &MF, 183e03cff6812ac41598e2bca7854985dc821a07f44Evan Cheng std::vector<MachineInstr*> &CPEMIs); 184c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng CPEntry *findConstPoolEntry(unsigned CPI, const MachineInstr *CPEMI); 18580697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach void JumpTableFunctionScan(MachineFunction &MF); 1865657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng void InitialFunctionScan(MachineFunction &MF, 187e03cff6812ac41598e2bca7854985dc821a07f44Evan Cheng const std::vector<MachineInstr*> &CPEMIs); 1880c61584d05894a5543f690803191a8b0da05b8fcEvan Cheng MachineBasicBlock *SplitBlockBeforeInstr(MachineInstr *MI); 189a8e2989ece6dc46df59b0768184028257f913843Evan Cheng void UpdateForInsertedWaterBlock(MachineBasicBlock *NewBB); 19099c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen void AdjustBBOffsetsAfter(MachineBasicBlock *BB, int delta); 191ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng bool DecrementOldEntry(unsigned CPI, MachineInstr* CPEMI); 19288e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen int LookForExistingCPEntry(CPUser& U, unsigned UserOffset); 193b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson bool LookForWater(CPUser&U, unsigned UserOffset, water_iterator &WaterIter); 194b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen void CreateNewWater(unsigned CPUserIndex, unsigned UserOffset, 195757652c5ba820bbea75d8713d7bf3749e4113778Bob Wilson MachineBasicBlock *&NewMBB); 1965657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng bool HandleConstantPoolUser(MachineFunction &MF, unsigned CPUserIndex); 197ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng void RemoveDeadCPEMI(MachineInstr *CPEMI); 198ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng bool RemoveUnusedCPEntries(); 1998494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson bool CPEIsInRange(MachineInstr *MI, unsigned UserOffset, 2005d8f1cae76e4e424bf3b4392eddb3f4dbf38662aEvan Cheng MachineInstr *CPEMI, unsigned Disp, bool NegOk, 2015d8f1cae76e4e424bf3b4392eddb3f4dbf38662aEvan Cheng bool DoDump = false); 20299c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen bool WaterIsInRange(unsigned UserOffset, MachineBasicBlock *Water, 2035d9c4b60204d741c213456e21b87e9af6a3dc627Dale Johannesen CPUser &U); 20499c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen bool OffsetIsInRange(unsigned UserOffset, unsigned TrialOffset, 205d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng unsigned Disp, bool NegativeOK, bool IsSoImm = false); 206c0dbec7e1038ee60b8525eb1e8e3eaa6a839bd5bEvan Cheng bool BBIsInRange(MachineInstr *MI, MachineBasicBlock *BB, unsigned Disp); 2075657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng bool FixUpImmediateBr(MachineFunction &MF, ImmBranch &Br); 2085657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng bool FixUpConditionalBr(MachineFunction &MF, ImmBranch &Br); 2095657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng bool FixUpUnconditionalBr(MachineFunction &MF, ImmBranch &Br); 210d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng bool UndoLRSpillRestore(); 211a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng bool OptimizeThumb2Instructions(MachineFunction &MF); 212a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng bool OptimizeThumb2Branches(MachineFunction &MF); 21380697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach bool ReorderThumb2JumpTables(MachineFunction &MF); 2145657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng bool OptimizeThumb2JumpTables(MachineFunction &MF); 2151fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach MachineBasicBlock *AdjustJTTargetBlockForward(MachineBasicBlock *BB, 2161fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach MachineBasicBlock *JTBB); 217a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 218a8e2989ece6dc46df59b0768184028257f913843Evan Cheng unsigned GetOffsetOf(MachineInstr *MI) const; 2198593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen void dumpBBs(); 2205657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng void verify(MachineFunction &MF); 221a8e2989ece6dc46df59b0768184028257f913843Evan Cheng }; 2221997473cf72957d0e70322e2fe6fe2ab141c58a6Devang Patel char ARMConstantIslands::ID = 0; 223a8e2989ece6dc46df59b0768184028257f913843Evan Cheng} 224a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 2258593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen/// verify - check BBOffsets, BBSizes, alignment of islands 2265657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Chengvoid ARMConstantIslands::verify(MachineFunction &MF) { 2278593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen assert(BBOffsets.size() == BBSizes.size()); 2288593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen for (unsigned i = 1, e = BBOffsets.size(); i != e; ++i) 2298593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen assert(BBOffsets[i-1]+BBSizes[i-1] == BBOffsets[i]); 230d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng if (!isThumb) 231d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng return; 232d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng#ifndef NDEBUG 2335657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng for (MachineFunction::iterator MBBI = MF.begin(), E = MF.end(); 234d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng MBBI != E; ++MBBI) { 235d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng MachineBasicBlock *MBB = MBBI; 236d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng if (!MBB->empty() && 237d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng MBB->begin()->getOpcode() == ARM::CONSTPOOL_ENTRY) { 238d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng unsigned MBBId = MBB->getNumber(); 239d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng assert((BBOffsets[MBBId]%4 == 0 && BBSizes[MBBId]%4 == 0) || 240d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng (BBOffsets[MBBId]%4 != 0 && BBSizes[MBBId]%4 != 0)); 2418593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen } 2428593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen } 243d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng#endif 2448593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen} 2458593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen 2468593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen/// print block size and offset information - debugging 2478593e418555fdae21a070357fd8734b4069c17d0Dale Johannesenvoid ARMConstantIslands::dumpBBs() { 2488593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen for (unsigned J = 0, E = BBOffsets.size(); J !=E; ++J) { 249893e1c90a03a53cf13f73849324e83612688428aChris Lattner DEBUG(errs() << "block " << J << " offset " << BBOffsets[J] 250893e1c90a03a53cf13f73849324e83612688428aChris Lattner << " size " << BBSizes[J] << "\n"); 2518593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen } 2528593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen} 2538593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen 254af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng/// createARMConstantIslandPass - returns an instance of the constpool 255af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng/// island pass. 256a8e2989ece6dc46df59b0768184028257f913843Evan ChengFunctionPass *llvm::createARMConstantIslandPass() { 257a8e2989ece6dc46df59b0768184028257f913843Evan Cheng return new ARMConstantIslands(); 258a8e2989ece6dc46df59b0768184028257f913843Evan Cheng} 259a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 2605657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Chengbool ARMConstantIslands::runOnMachineFunction(MachineFunction &MF) { 2615657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng MachineConstantPool &MCP = *MF.getConstantPool(); 2628494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 2635657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng TII = MF.getTarget().getInstrInfo(); 2645657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng AFI = MF.getInfo<ARMFunctionInfo>(); 26525f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng STI = &MF.getTarget().getSubtarget<ARMSubtarget>(); 26625f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng 267b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen isThumb = AFI->isThumbFunction(); 268d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng isThumb1 = AFI->isThumb1OnlyFunction(); 2695e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin isThumb2 = AFI->isThumb2Function(); 270d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng 271d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng HasFarJump = false; 272d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng 273a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Renumber all of the machine basic blocks in the function, guaranteeing that 274a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // the numbers agree with the position of the block in the function. 2755657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng MF.RenumberBlocks(); 276a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 27780697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach // Try to reorder and otherwise adjust the block layout to make good use 27880697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach // of the TB[BH] instructions. 27980697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach bool MadeChange = false; 28080697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach if (isThumb2 && AdjustJumpTableBlocks) { 28180697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach JumpTableFunctionScan(MF); 28280697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach MadeChange |= ReorderThumb2JumpTables(MF); 28380697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach // Data is out of date, so clear it. It'll be re-computed later. 28480697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach BBSizes.clear(); 28580697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach BBOffsets.clear(); 28680697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach T2JumpTables.clear(); 28780697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach // Blocks may have shifted around. Keep the numbering up to date. 28880697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach MF.RenumberBlocks(); 28980697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach } 29080697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach 291d26b14c34cbcee1448b86b524578fc51cc979023Evan Cheng // Thumb1 functions containing constant pools get 4-byte alignment. 292d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng // This is so we can keep exact track of where the alignment padding goes. 293d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng 294d26b14c34cbcee1448b86b524578fc51cc979023Evan Cheng // Set default. Thumb1 function is 2-byte aligned, ARM and Thumb2 are 4-byte 295d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng // aligned. 296d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng AFI->setAlign(isThumb1 ? 1U : 2U); 29756c42ef3e43f8eb75c435e781d0ac8251c7588a1Dale Johannesen 298a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Perform the initial placement of the constant pool entries. To start with, 299a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // we put them all at the end of the function. 300e03cff6812ac41598e2bca7854985dc821a07f44Evan Cheng std::vector<MachineInstr*> CPEMIs; 30156c42ef3e43f8eb75c435e781d0ac8251c7588a1Dale Johannesen if (!MCP.isEmpty()) { 3025657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng DoInitialPlacement(MF, CPEMIs); 303d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng if (isThumb1) 30456c42ef3e43f8eb75c435e781d0ac8251c7588a1Dale Johannesen AFI->setAlign(2U); 30556c42ef3e43f8eb75c435e781d0ac8251c7588a1Dale Johannesen } 3068494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 307a8e2989ece6dc46df59b0768184028257f913843Evan Cheng /// The next UID to take is the first unused one. 308f1bbb9577a42cf7dc3079412f1dd7683e3a03665Evan Cheng AFI->initConstPoolEntryUId(CPEMIs.size()); 3098494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 310a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Do the initial scan of the function, building up information about the 311a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // sizes of each block, the location of all the water, and finding all of the 312a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // constant pool users. 3135657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng InitialFunctionScan(MF, CPEMIs); 314a8e2989ece6dc46df59b0768184028257f913843Evan Cheng CPEMIs.clear(); 3158494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 316ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng /// Remove dead constant pool entries. 317ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng RemoveUnusedCPEntries(); 318ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng 319d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng // Iteratively place constant pool entries and fix up branches until there 320d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng // is no change. 321b6879b2b84df2f642cd39f5bf58584c4a39f8080Evan Cheng unsigned NoCPIters = 0, NoBRIters = 0; 322d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng while (true) { 323b6879b2b84df2f642cd39f5bf58584c4a39f8080Evan Cheng bool CPChange = false; 324a8e2989ece6dc46df59b0768184028257f913843Evan Cheng for (unsigned i = 0, e = CPUsers.size(); i != e; ++i) 325b6879b2b84df2f642cd39f5bf58584c4a39f8080Evan Cheng CPChange |= HandleConstantPoolUser(MF, i); 326b6879b2b84df2f642cd39f5bf58584c4a39f8080Evan Cheng if (CPChange && ++NoCPIters > 30) 327b6879b2b84df2f642cd39f5bf58584c4a39f8080Evan Cheng llvm_unreachable("Constant Island pass failed to converge!"); 3288202010364e1bfe6111f1ce62f154499b80877fbEvan Cheng DEBUG(dumpBBs()); 329b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson 330b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // Clear NewWaterList now. If we split a block for branches, it should 331b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // appear as "new water" for the next iteration of constant pool placement. 332b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson NewWaterList.clear(); 333b6879b2b84df2f642cd39f5bf58584c4a39f8080Evan Cheng 334b6879b2b84df2f642cd39f5bf58584c4a39f8080Evan Cheng bool BRChange = false; 335af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng for (unsigned i = 0, e = ImmBranches.size(); i != e; ++i) 336b6879b2b84df2f642cd39f5bf58584c4a39f8080Evan Cheng BRChange |= FixUpImmediateBr(MF, ImmBranches[i]); 337b6879b2b84df2f642cd39f5bf58584c4a39f8080Evan Cheng if (BRChange && ++NoBRIters > 30) 338b6879b2b84df2f642cd39f5bf58584c4a39f8080Evan Cheng llvm_unreachable("Branch Fix Up pass failed to converge!"); 3398202010364e1bfe6111f1ce62f154499b80877fbEvan Cheng DEBUG(dumpBBs()); 340b6879b2b84df2f642cd39f5bf58584c4a39f8080Evan Cheng 341b6879b2b84df2f642cd39f5bf58584c4a39f8080Evan Cheng if (!CPChange && !BRChange) 342d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng break; 343d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng MadeChange = true; 344d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng } 345ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng 346a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng // Shrink 32-bit Thumb2 branch, load, and store instructions. 347a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng if (isThumb2) 348a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng MadeChange |= OptimizeThumb2Instructions(MF); 34925f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng 3508593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // After a while, this might be made debug-only, but it is not expensive. 3515657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng verify(MF); 3528593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen 353d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng // If LR has been forced spilled and no far jumps (i.e. BL) has been issued. 354d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng // Undo the spill / restore of LR if possible. 3555657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng if (isThumb && !HasFarJump && AFI->isLRSpilledForFarJump()) 356d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng MadeChange |= UndoLRSpillRestore(); 357d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng 358a8e2989ece6dc46df59b0768184028257f913843Evan Cheng BBSizes.clear(); 35999c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen BBOffsets.clear(); 360a8e2989ece6dc46df59b0768184028257f913843Evan Cheng WaterList.clear(); 361a8e2989ece6dc46df59b0768184028257f913843Evan Cheng CPUsers.clear(); 362c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng CPEntries.clear(); 363af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng ImmBranches.clear(); 364c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng PushPopMIs.clear(); 3655657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng T2JumpTables.clear(); 366d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng 367d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng return MadeChange; 368a8e2989ece6dc46df59b0768184028257f913843Evan Cheng} 369a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 370a8e2989ece6dc46df59b0768184028257f913843Evan Cheng/// DoInitialPlacement - Perform the initial placement of the constant pool 371a8e2989ece6dc46df59b0768184028257f913843Evan Cheng/// entries. To start with, we put them all at the end of the function. 3725657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Chengvoid ARMConstantIslands::DoInitialPlacement(MachineFunction &MF, 3738494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson std::vector<MachineInstr*> &CPEMIs) { 374a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Create the basic block to hold the CPE's. 3755657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng MachineBasicBlock *BB = MF.CreateMachineBasicBlock(); 3765657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng MF.push_back(BB); 3778494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 378a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Add all of the constants from the constant pool to the end block, use an 379a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // identity mapping of CPI's to CPE's. 380a8e2989ece6dc46df59b0768184028257f913843Evan Cheng const std::vector<MachineConstantPoolEntry> &CPs = 3815657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng MF.getConstantPool()->getConstants(); 3828494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 3835657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng const TargetData &TD = *MF.getTarget().getTargetData(); 384a8e2989ece6dc46df59b0768184028257f913843Evan Cheng for (unsigned i = 0, e = CPs.size(); i != e; ++i) { 385777d2306b36816a53bc1ae1244c0dc7d998ae691Duncan Sands unsigned Size = TD.getTypeAllocSize(CPs[i].getType()); 386a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Verify that all constant pool entries are a multiple of 4 bytes. If not, 387a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // we would have to pad them out or something so that instructions stay 388a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // aligned. 389a8e2989ece6dc46df59b0768184028257f913843Evan Cheng assert((Size & 3) == 0 && "CP Entry not multiple of 4 bytes!"); 390a8e2989ece6dc46df59b0768184028257f913843Evan Cheng MachineInstr *CPEMI = 391b67284057ee130114055309eabe0bcd1af13777dDale Johannesen BuildMI(BB, DebugLoc::getUnknownLoc(), TII->get(ARM::CONSTPOOL_ENTRY)) 392a8e2989ece6dc46df59b0768184028257f913843Evan Cheng .addImm(i).addConstantPoolIndex(i).addImm(Size); 393a8e2989ece6dc46df59b0768184028257f913843Evan Cheng CPEMIs.push_back(CPEMI); 394c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng 395c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng // Add a new CPEntry, but no corresponding CPUser yet. 396c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng std::vector<CPEntry> CPEs; 397c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng CPEs.push_back(CPEntry(CPEMI, i)); 398c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng CPEntries.push_back(CPEs); 399c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng NumCPEs++; 400893e1c90a03a53cf13f73849324e83612688428aChris Lattner DEBUG(errs() << "Moved CPI#" << i << " to end of function as #" << i 401893e1c90a03a53cf13f73849324e83612688428aChris Lattner << "\n"); 402a8e2989ece6dc46df59b0768184028257f913843Evan Cheng } 403a8e2989ece6dc46df59b0768184028257f913843Evan Cheng} 404a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 40588e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen/// BBHasFallthrough - Return true if the specified basic block can fallthrough 406a8e2989ece6dc46df59b0768184028257f913843Evan Cheng/// into the block immediately after it. 407a8e2989ece6dc46df59b0768184028257f913843Evan Chengstatic bool BBHasFallthrough(MachineBasicBlock *MBB) { 408a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Get the next machine basic block in the function. 409a8e2989ece6dc46df59b0768184028257f913843Evan Cheng MachineFunction::iterator MBBI = MBB; 410a8e2989ece6dc46df59b0768184028257f913843Evan Cheng if (next(MBBI) == MBB->getParent()->end()) // Can't fall off end of function. 411a8e2989ece6dc46df59b0768184028257f913843Evan Cheng return false; 4128494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 413a8e2989ece6dc46df59b0768184028257f913843Evan Cheng MachineBasicBlock *NextBB = next(MBBI); 414a8e2989ece6dc46df59b0768184028257f913843Evan Cheng for (MachineBasicBlock::succ_iterator I = MBB->succ_begin(), 415a8e2989ece6dc46df59b0768184028257f913843Evan Cheng E = MBB->succ_end(); I != E; ++I) 416a8e2989ece6dc46df59b0768184028257f913843Evan Cheng if (*I == NextBB) 417a8e2989ece6dc46df59b0768184028257f913843Evan Cheng return true; 4188494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 419a8e2989ece6dc46df59b0768184028257f913843Evan Cheng return false; 420a8e2989ece6dc46df59b0768184028257f913843Evan Cheng} 421a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 422c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng/// findConstPoolEntry - Given the constpool index and CONSTPOOL_ENTRY MI, 423c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng/// look up the corresponding CPEntry. 424c99ef085b90b32952b484e8843fb66ad65215b61Evan ChengARMConstantIslands::CPEntry 425c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng*ARMConstantIslands::findConstPoolEntry(unsigned CPI, 426c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng const MachineInstr *CPEMI) { 427c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng std::vector<CPEntry> &CPEs = CPEntries[CPI]; 428c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng // Number of entries per constpool index should be small, just do a 429c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng // linear search. 430c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng for (unsigned i = 0, e = CPEs.size(); i != e; ++i) { 431c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng if (CPEs[i].CPEMI == CPEMI) 432c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng return &CPEs[i]; 433c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng } 434c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng return NULL; 435c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng} 436c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng 43780697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach/// JumpTableFunctionScan - Do a scan of the function, building up 43880697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach/// information about the sizes of each block and the locations of all 43980697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach/// the jump tables. 44080697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbachvoid ARMConstantIslands::JumpTableFunctionScan(MachineFunction &MF) { 44180697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach unsigned Offset = 0; 44280697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach for (MachineFunction::iterator MBBI = MF.begin(), E = MF.end(); 44380697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach MBBI != E; ++MBBI) { 44480697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach MachineBasicBlock &MBB = *MBBI; 44580697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach 44680697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach unsigned MBBSize = 0; 44780697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); 44880697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach I != E; ++I) { 44980697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach // Add instruction size to MBBSize. 45080697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach MBBSize += TII->GetInstSizeInBytes(I); 45180697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach 45280697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach int Opc = I->getOpcode(); 45380697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach if (I->getDesc().isBranch()) { 45480697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach switch (Opc) { 45580697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach default: 45680697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach continue; // Ignore other JT branches 45780697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach case ARM::t2BR_JT: 45880697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach T2JumpTables.push_back(I); 45980697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach continue; // Does not get an entry in ImmBranches 46080697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach } 46180697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach } 46280697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach } 46380697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach 46480697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach BBSizes.push_back(MBBSize); 46580697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach BBOffsets.push_back(Offset); 46680697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach Offset += MBBSize; 46780697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach } 46880697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach} 46980697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach 470a8e2989ece6dc46df59b0768184028257f913843Evan Cheng/// InitialFunctionScan - Do the initial scan of the function, building up 471a8e2989ece6dc46df59b0768184028257f913843Evan Cheng/// information about the sizes of each block, the location of all the water, 472a8e2989ece6dc46df59b0768184028257f913843Evan Cheng/// and finding all of the constant pool users. 4735657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Chengvoid ARMConstantIslands::InitialFunctionScan(MachineFunction &MF, 474e03cff6812ac41598e2bca7854985dc821a07f44Evan Cheng const std::vector<MachineInstr*> &CPEMIs) { 47599c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen unsigned Offset = 0; 4765657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng for (MachineFunction::iterator MBBI = MF.begin(), E = MF.end(); 477a8e2989ece6dc46df59b0768184028257f913843Evan Cheng MBBI != E; ++MBBI) { 478a8e2989ece6dc46df59b0768184028257f913843Evan Cheng MachineBasicBlock &MBB = *MBBI; 4798494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 480a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // If this block doesn't fall through into the next MBB, then this is 481a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // 'water' that a constant pool island could be placed. 482a8e2989ece6dc46df59b0768184028257f913843Evan Cheng if (!BBHasFallthrough(&MBB)) 483a8e2989ece6dc46df59b0768184028257f913843Evan Cheng WaterList.push_back(&MBB); 4848494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 485a8e2989ece6dc46df59b0768184028257f913843Evan Cheng unsigned MBBSize = 0; 486a8e2989ece6dc46df59b0768184028257f913843Evan Cheng for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); 487a8e2989ece6dc46df59b0768184028257f913843Evan Cheng I != E; ++I) { 488a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Add instruction size to MBBSize. 48952e724ad7e679ee590f4bd763d55280586a8f1bcNicolas Geoffray MBBSize += TII->GetInstSizeInBytes(I); 490a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 491af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng int Opc = I->getOpcode(); 492749c6f6b5ed301c84aac562e414486549d7b98ebChris Lattner if (I->getDesc().isBranch()) { 493af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng bool isCond = false; 494af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng unsigned Bits = 0; 495af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng unsigned Scale = 1; 496af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng int UOpc = Opc; 497af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng switch (Opc) { 4985657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng default: 4995657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng continue; // Ignore other JT branches 5008593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen case ARM::tBR_JTr: 50166ac53165e17b7c76b8c69e57bde623d44ec492eEvan Cheng // A Thumb1 table jump may involve padding; for the offsets to 5028593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // be right, functions containing these must be 4-byte aligned. 5038593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen AFI->setAlign(2U); 5048593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen if ((Offset+MBBSize)%4 != 0) 5055657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng // FIXME: Add a pseudo ALIGN instruction instead. 5068593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen MBBSize += 2; // padding 5078593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen continue; // Does not get an entry in ImmBranches 5085657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng case ARM::t2BR_JT: 5095657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng T2JumpTables.push_back(I); 5105657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng continue; // Does not get an entry in ImmBranches 511af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng case ARM::Bcc: 512af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng isCond = true; 513af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng UOpc = ARM::B; 514af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng // Fallthrough 515af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng case ARM::B: 516af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng Bits = 24; 517af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng Scale = 4; 518af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng break; 519af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng case ARM::tBcc: 520af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng isCond = true; 521af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng UOpc = ARM::tB; 522af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng Bits = 8; 523af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng Scale = 2; 524af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng break; 525af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng case ARM::tB: 526af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng Bits = 11; 527af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng Scale = 2; 528af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng break; 5295e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin case ARM::t2Bcc: 5305e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin isCond = true; 5315e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin UOpc = ARM::t2B; 5325e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin Bits = 20; 5335e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin Scale = 2; 5345e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin break; 5355e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin case ARM::t2B: 5365e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin Bits = 24; 5375e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin Scale = 2; 5385e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin break; 539af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng } 540b43216ee4a418257ce5530c02601b77efe86c354Evan Cheng 541b43216ee4a418257ce5530c02601b77efe86c354Evan Cheng // Record this immediate branch. 542bd5d3dbdbe46c7325545a7cb8c891c0347375451Evan Cheng unsigned MaxOffs = ((1 << (Bits-1))-1) * Scale; 543b43216ee4a418257ce5530c02601b77efe86c354Evan Cheng ImmBranches.push_back(ImmBranch(I, MaxOffs, isCond, UOpc)); 544af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng } 545af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng 546d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng if (Opc == ARM::tPUSH || Opc == ARM::tPOP_RET) 547d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng PushPopMIs.push_back(I); 548d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng 549d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng if (Opc == ARM::CONSTPOOL_ENTRY) 550d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng continue; 551d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng 552a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Scan the instructions for constant pool operands. 553a8e2989ece6dc46df59b0768184028257f913843Evan Cheng for (unsigned op = 0, e = I->getNumOperands(); op != e; ++op) 554d735b8019b0f297d7c14b55adcd887af24d8e602Dan Gohman if (I->getOperand(op).isCPI()) { 555a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // We found one. The addressing mode tells us the max displacement 556a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // from the PC that this instruction permits. 5578494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 558a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Basic size info comes from the TSFlags field. 559b43216ee4a418257ce5530c02601b77efe86c354Evan Cheng unsigned Bits = 0; 560b43216ee4a418257ce5530c02601b77efe86c354Evan Cheng unsigned Scale = 1; 5615d8f1cae76e4e424bf3b4392eddb3f4dbf38662aEvan Cheng bool NegOk = false; 562d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng bool IsSoImm = false; 563d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng 564d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng switch (Opc) { 5658494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson default: 566c23197a26f34f559ea9797de51e187087c039c42Torok Edwin llvm_unreachable("Unknown addressing mode for CP reference!"); 567a8e2989ece6dc46df59b0768184028257f913843Evan Cheng break; 568d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng 569d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng // Taking the address of a CP entry. 570d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng case ARM::LEApcrel: 571d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng // This takes a SoImm, which is 8 bit immediate rotated. We'll 572d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng // pretend the maximum offset is 255 * 4. Since each instruction 573d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng // 4 byte wide, this is always correct. We'llc heck for other 574d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng // displacements that fits in a SoImm as well. 575d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng Bits = 8; 576d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng Scale = 4; 5775d8f1cae76e4e424bf3b4392eddb3f4dbf38662aEvan Cheng NegOk = true; 578d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng IsSoImm = true; 579a8e2989ece6dc46df59b0768184028257f913843Evan Cheng break; 580d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng case ARM::t2LEApcrel: 581d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng Bits = 12; 5825d8f1cae76e4e424bf3b4392eddb3f4dbf38662aEvan Cheng NegOk = true; 583a8e2989ece6dc46df59b0768184028257f913843Evan Cheng break; 584d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng case ARM::tLEApcrel: 585b43216ee4a418257ce5530c02601b77efe86c354Evan Cheng Bits = 8; 586d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng Scale = 4; 587a8e2989ece6dc46df59b0768184028257f913843Evan Cheng break; 588d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng 589d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng case ARM::LDR: 590d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng case ARM::LDRcp: 591d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng case ARM::t2LDRpci: 592d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng Bits = 12; // +-offset_12 593d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng NegOk = true; 594a8e2989ece6dc46df59b0768184028257f913843Evan Cheng break; 595d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng 596d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng case ARM::tLDRpci: 597d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng case ARM::tLDRcp: 598b43216ee4a418257ce5530c02601b77efe86c354Evan Cheng Bits = 8; 599b43216ee4a418257ce5530c02601b77efe86c354Evan Cheng Scale = 4; // +(offset_8*4) 600012f2d97b78e4eb9128f1d491f2c177768dbe527Evan Cheng break; 601d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng 602e5165490b7ba24bb2f3043399e0d60e7f3bcf8a5Jim Grosbach case ARM::VLDRD: 603e5165490b7ba24bb2f3043399e0d60e7f3bcf8a5Jim Grosbach case ARM::VLDRS: 604d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng Bits = 8; 605d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng Scale = 4; // +-(offset_8*4) 606d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng NegOk = true; 607055b0310f862b91f33699037ce67d3ab8137c20cEvan Cheng break; 608a8e2989ece6dc46df59b0768184028257f913843Evan Cheng } 609b43216ee4a418257ce5530c02601b77efe86c354Evan Cheng 610a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Remember that this is a user of a CP entry. 6118aa797aa51cd4ea1ec6f46f4891a6897944b75b2Chris Lattner unsigned CPI = I->getOperand(op).getIndex(); 612c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng MachineInstr *CPEMI = CPEMIs[CPI]; 61331b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng unsigned MaxOffs = ((1 << Bits)-1) * Scale; 614d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng CPUsers.push_back(CPUser(I, CPEMI, MaxOffs, NegOk, IsSoImm)); 615c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng 616c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng // Increment corresponding CPEntry reference count. 617c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng CPEntry *CPE = findConstPoolEntry(CPI, CPEMI); 618c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng assert(CPE && "Cannot find a corresponding CPEntry!"); 619c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng CPE->RefCount++; 6208494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 621a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Instructions can only use one CP entry, don't bother scanning the 622a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // rest of the operands. 623a8e2989ece6dc46df59b0768184028257f913843Evan Cheng break; 624a8e2989ece6dc46df59b0768184028257f913843Evan Cheng } 625a8e2989ece6dc46df59b0768184028257f913843Evan Cheng } 6262021abe154e3cac523755b74fc5e62a2c9dad1fcEvan Cheng 6278593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // In thumb mode, if this block is a constpool island, we may need padding 6288593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // so it's aligned on 4 byte boundary. 629b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen if (isThumb && 63005cc424082f797c5820b19f29f398c9cce9b9928Evan Cheng !MBB.empty() && 6318593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen MBB.begin()->getOpcode() == ARM::CONSTPOOL_ENTRY && 6328593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen (Offset%4) != 0) 6332021abe154e3cac523755b74fc5e62a2c9dad1fcEvan Cheng MBBSize += 2; 6342021abe154e3cac523755b74fc5e62a2c9dad1fcEvan Cheng 635a8e2989ece6dc46df59b0768184028257f913843Evan Cheng BBSizes.push_back(MBBSize); 63699c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen BBOffsets.push_back(Offset); 63799c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen Offset += MBBSize; 638a8e2989ece6dc46df59b0768184028257f913843Evan Cheng } 639a8e2989ece6dc46df59b0768184028257f913843Evan Cheng} 640a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 641a8e2989ece6dc46df59b0768184028257f913843Evan Cheng/// GetOffsetOf - Return the current offset of the specified machine instruction 642a8e2989ece6dc46df59b0768184028257f913843Evan Cheng/// from the start of the function. This offset changes as stuff is moved 643a8e2989ece6dc46df59b0768184028257f913843Evan Cheng/// around inside the function. 644a8e2989ece6dc46df59b0768184028257f913843Evan Chengunsigned ARMConstantIslands::GetOffsetOf(MachineInstr *MI) const { 645a8e2989ece6dc46df59b0768184028257f913843Evan Cheng MachineBasicBlock *MBB = MI->getParent(); 6468494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 647a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // The offset is composed of two things: the sum of the sizes of all MBB's 648a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // before this instruction's block, and the offset from the start of the block 649a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // it is in. 65099c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen unsigned Offset = BBOffsets[MBB->getNumber()]; 651a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 6528593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // If we're looking for a CONSTPOOL_ENTRY in Thumb, see if this block has 6538593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // alignment padding, and compensate if so. 6548494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson if (isThumb && 6558494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson MI->getOpcode() == ARM::CONSTPOOL_ENTRY && 6568593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen Offset%4 != 0) 6578593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen Offset += 2; 6588593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen 659a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Sum instructions before MI in MBB. 660a8e2989ece6dc46df59b0768184028257f913843Evan Cheng for (MachineBasicBlock::iterator I = MBB->begin(); ; ++I) { 661a8e2989ece6dc46df59b0768184028257f913843Evan Cheng assert(I != MBB->end() && "Didn't find MI in its own basic block?"); 662a8e2989ece6dc46df59b0768184028257f913843Evan Cheng if (&*I == MI) return Offset; 66352e724ad7e679ee590f4bd763d55280586a8f1bcNicolas Geoffray Offset += TII->GetInstSizeInBytes(I); 664a8e2989ece6dc46df59b0768184028257f913843Evan Cheng } 665a8e2989ece6dc46df59b0768184028257f913843Evan Cheng} 666a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 667a8e2989ece6dc46df59b0768184028257f913843Evan Cheng/// CompareMBBNumbers - Little predicate function to sort the WaterList by MBB 668a8e2989ece6dc46df59b0768184028257f913843Evan Cheng/// ID. 669a8e2989ece6dc46df59b0768184028257f913843Evan Chengstatic bool CompareMBBNumbers(const MachineBasicBlock *LHS, 670a8e2989ece6dc46df59b0768184028257f913843Evan Cheng const MachineBasicBlock *RHS) { 671a8e2989ece6dc46df59b0768184028257f913843Evan Cheng return LHS->getNumber() < RHS->getNumber(); 672a8e2989ece6dc46df59b0768184028257f913843Evan Cheng} 673a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 674a8e2989ece6dc46df59b0768184028257f913843Evan Cheng/// UpdateForInsertedWaterBlock - When a block is newly inserted into the 675a8e2989ece6dc46df59b0768184028257f913843Evan Cheng/// machine function, it upsets all of the block numbers. Renumber the blocks 676a8e2989ece6dc46df59b0768184028257f913843Evan Cheng/// and update the arrays that parallel this numbering. 677a8e2989ece6dc46df59b0768184028257f913843Evan Chengvoid ARMConstantIslands::UpdateForInsertedWaterBlock(MachineBasicBlock *NewBB) { 678a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Renumber the MBB's to keep them consequtive. 679a8e2989ece6dc46df59b0768184028257f913843Evan Cheng NewBB->getParent()->RenumberBlocks(NewBB); 6808494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 681a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Insert a size into BBSizes to align it properly with the (newly 682a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // renumbered) block numbers. 683a8e2989ece6dc46df59b0768184028257f913843Evan Cheng BBSizes.insert(BBSizes.begin()+NewBB->getNumber(), 0); 68499c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen 68599c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen // Likewise for BBOffsets. 68699c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen BBOffsets.insert(BBOffsets.begin()+NewBB->getNumber(), 0); 6878494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 6888494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson // Next, update WaterList. Specifically, we need to add NewMBB as having 689a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // available water after it. 690034de5f65f9139954cb01d94eaebbaefd294946eBob Wilson water_iterator IP = 691a8e2989ece6dc46df59b0768184028257f913843Evan Cheng std::lower_bound(WaterList.begin(), WaterList.end(), NewBB, 692a8e2989ece6dc46df59b0768184028257f913843Evan Cheng CompareMBBNumbers); 693a8e2989ece6dc46df59b0768184028257f913843Evan Cheng WaterList.insert(IP, NewBB); 694a8e2989ece6dc46df59b0768184028257f913843Evan Cheng} 695a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 696a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 697a8e2989ece6dc46df59b0768184028257f913843Evan Cheng/// Split the basic block containing MI into two blocks, which are joined by 698b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson/// an unconditional branch. Update data structures and renumber blocks to 6990c61584d05894a5543f690803191a8b0da05b8fcEvan Cheng/// account for this change and returns the newly created block. 7000c61584d05894a5543f690803191a8b0da05b8fcEvan ChengMachineBasicBlock *ARMConstantIslands::SplitBlockBeforeInstr(MachineInstr *MI) { 701a8e2989ece6dc46df59b0768184028257f913843Evan Cheng MachineBasicBlock *OrigBB = MI->getParent(); 7028e5f2c6f65841542e2a7092553fe42a00048e4c7Dan Gohman MachineFunction &MF = *OrigBB->getParent(); 703a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 704a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Create a new MBB for the code after the OrigBB. 7058494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson MachineBasicBlock *NewBB = 7068494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson MF.CreateMachineBasicBlock(OrigBB->getBasicBlock()); 707a8e2989ece6dc46df59b0768184028257f913843Evan Cheng MachineFunction::iterator MBBI = OrigBB; ++MBBI; 7088e5f2c6f65841542e2a7092553fe42a00048e4c7Dan Gohman MF.insert(MBBI, NewBB); 7098494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 710a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Splice the instructions starting with MI over to NewBB. 711a8e2989ece6dc46df59b0768184028257f913843Evan Cheng NewBB->splice(NewBB->end(), OrigBB, MI, OrigBB->end()); 7128494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 713a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Add an unconditional branch from OrigBB to NewBB. 714a9b8b8d62c67e96bc4dc2ed25298c539102f8638Evan Cheng // Note the new unconditional branch is not being recorded. 715b67284057ee130114055309eabe0bcd1af13777dDale Johannesen // There doesn't seem to be meaningful DebugInfo available; this doesn't 716b67284057ee130114055309eabe0bcd1af13777dDale Johannesen // correspond to anything in the source. 71758541fd62707b6856beee3db9e254b0110607bb1Evan Cheng unsigned Opc = isThumb ? (isThumb2 ? ARM::t2B : ARM::tB) : ARM::B; 71858541fd62707b6856beee3db9e254b0110607bb1Evan Cheng BuildMI(OrigBB, DebugLoc::getUnknownLoc(), TII->get(Opc)).addMBB(NewBB); 719a8e2989ece6dc46df59b0768184028257f913843Evan Cheng NumSplit++; 7208494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 721a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Update the CFG. All succs of OrigBB are now succs of NewBB. 722a8e2989ece6dc46df59b0768184028257f913843Evan Cheng while (!OrigBB->succ_empty()) { 723a8e2989ece6dc46df59b0768184028257f913843Evan Cheng MachineBasicBlock *Succ = *OrigBB->succ_begin(); 724a8e2989ece6dc46df59b0768184028257f913843Evan Cheng OrigBB->removeSuccessor(Succ); 725a8e2989ece6dc46df59b0768184028257f913843Evan Cheng NewBB->addSuccessor(Succ); 7268494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 727a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // This pass should be run after register allocation, so there should be no 728a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // PHI nodes to update. 729a8e2989ece6dc46df59b0768184028257f913843Evan Cheng assert((Succ->empty() || Succ->begin()->getOpcode() != TargetInstrInfo::PHI) 730a8e2989ece6dc46df59b0768184028257f913843Evan Cheng && "PHI nodes should be eliminated by now!"); 731a8e2989ece6dc46df59b0768184028257f913843Evan Cheng } 7328494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 733a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // OrigBB branches to NewBB. 734a8e2989ece6dc46df59b0768184028257f913843Evan Cheng OrigBB->addSuccessor(NewBB); 7358494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 736a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Update internal data structures to account for the newly inserted MBB. 73788e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // This is almost the same as UpdateForInsertedWaterBlock, except that 73888e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // the Water goes after OrigBB, not NewBB. 7398e5f2c6f65841542e2a7092553fe42a00048e4c7Dan Gohman MF.RenumberBlocks(NewBB); 7408494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 74188e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // Insert a size into BBSizes to align it properly with the (newly 74288e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // renumbered) block numbers. 74388e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen BBSizes.insert(BBSizes.begin()+NewBB->getNumber(), 0); 7448494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 74599c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen // Likewise for BBOffsets. 74699c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen BBOffsets.insert(BBOffsets.begin()+NewBB->getNumber(), 0); 74799c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen 7488494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson // Next, update WaterList. Specifically, we need to add OrigMBB as having 74988e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // available water after it (but not if it's already there, which happens 75088e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // when splitting before a conditional branch that is followed by an 75188e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // unconditional branch - in that case we want to insert NewBB). 752034de5f65f9139954cb01d94eaebbaefd294946eBob Wilson water_iterator IP = 75388e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen std::lower_bound(WaterList.begin(), WaterList.end(), OrigBB, 75488e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen CompareMBBNumbers); 75588e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen MachineBasicBlock* WaterBB = *IP; 75688e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen if (WaterBB == OrigBB) 75788e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen WaterList.insert(next(IP), NewBB); 75888e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen else 75988e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen WaterList.insert(IP, OrigBB); 760b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson NewWaterList.insert(OrigBB); 76188e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen 7628593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // Figure out how large the first NewMBB is. (It cannot 7638593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // contain a constpool_entry or tablejump.) 764a8e2989ece6dc46df59b0768184028257f913843Evan Cheng unsigned NewBBSize = 0; 765a8e2989ece6dc46df59b0768184028257f913843Evan Cheng for (MachineBasicBlock::iterator I = NewBB->begin(), E = NewBB->end(); 766a8e2989ece6dc46df59b0768184028257f913843Evan Cheng I != E; ++I) 76752e724ad7e679ee590f4bd763d55280586a8f1bcNicolas Geoffray NewBBSize += TII->GetInstSizeInBytes(I); 7688494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 76999c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen unsigned OrigBBI = OrigBB->getNumber(); 77099c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen unsigned NewBBI = NewBB->getNumber(); 771a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Set the size of NewBB in BBSizes. 77299c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen BBSizes[NewBBI] = NewBBSize; 7738494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 774a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // We removed instructions from UserMBB, subtract that off from its size. 775af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng // Add 2 or 4 to the block to count the unconditional branch we added to it. 77625f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng int delta = isThumb1 ? 2 : 4; 77799c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen BBSizes[OrigBBI] -= NewBBSize - delta; 77899c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen 77999c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen // ...and adjust BBOffsets for NewBB accordingly. 78099c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen BBOffsets[NewBBI] = BBOffsets[OrigBBI] + BBSizes[OrigBBI]; 78199c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen 78299c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen // All BBOffsets following these blocks must be modified. 78399c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen AdjustBBOffsetsAfter(NewBB, delta); 7840c61584d05894a5543f690803191a8b0da05b8fcEvan Cheng 7850c61584d05894a5543f690803191a8b0da05b8fcEvan Cheng return NewBB; 786a8e2989ece6dc46df59b0768184028257f913843Evan Cheng} 787a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 7888593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen/// OffsetIsInRange - Checks whether UserOffset (the location of a constant pool 7898494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson/// reference) is within MaxDisp of TrialOffset (a proposed location of a 7908593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen/// constant pool entry). 7918494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilsonbool ARMConstantIslands::OffsetIsInRange(unsigned UserOffset, 792d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng unsigned TrialOffset, unsigned MaxDisp, 793d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng bool NegativeOK, bool IsSoImm) { 7948494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson // On Thumb offsets==2 mod 4 are rounded down by the hardware for 7958494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson // purposes of the displacement computation; compensate for that here. 7968593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // Effectively, the valid range of displacements is 2 bytes smaller for such 7978593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // references. 79831b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng unsigned TotalAdj = 0; 79931b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng if (isThumb && UserOffset%4 !=0) { 8008593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen UserOffset -= 2; 80131b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng TotalAdj = 2; 80231b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng } 8038593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // CPEs will be rounded up to a multiple of 4. 80431b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng if (isThumb && TrialOffset%4 != 0) { 8058593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen TrialOffset += 2; 80631b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng TotalAdj += 2; 80731b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng } 80831b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng 80931b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng // In Thumb2 mode, later branch adjustments can shift instructions up and 81031b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng // cause alignment change. In the worst case scenario this can cause the 81131b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng // user's effective address to be subtracted by 2 and the CPE's address to 81231b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng // be plus 2. 81331b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng if (isThumb2 && TotalAdj != 4) 81431b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng MaxDisp -= (4 - TotalAdj); 8158593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen 81699c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen if (UserOffset <= TrialOffset) { 81799c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen // User before the Trial. 818d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng if (TrialOffset - UserOffset <= MaxDisp) 819d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng return true; 82040efc251cd7a52dd2375ec95ee38b1be4572178fEvan Cheng // FIXME: Make use full range of soimm values. 82199c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen } else if (NegativeOK) { 822d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng if (UserOffset - TrialOffset <= MaxDisp) 823d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng return true; 82440efc251cd7a52dd2375ec95ee38b1be4572178fEvan Cheng // FIXME: Make use full range of soimm values. 82599c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen } 82699c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen return false; 82799c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen} 82899c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen 82988e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen/// WaterIsInRange - Returns true if a CPE placed after the specified 83088e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen/// Water (a basic block) will be in range for the specific MI. 83188e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen 83288e37ae36652546c8e409cab69a1777af63cf095Dale Johannesenbool ARMConstantIslands::WaterIsInRange(unsigned UserOffset, 8335d8f1cae76e4e424bf3b4392eddb3f4dbf38662aEvan Cheng MachineBasicBlock* Water, CPUser &U) { 8345d9c4b60204d741c213456e21b87e9af6a3dc627Dale Johannesen unsigned MaxDisp = U.MaxDisp; 8358494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson unsigned CPEOffset = BBOffsets[Water->getNumber()] + 83688e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen BBSizes[Water->getNumber()]; 83788e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen 838d959aa421a8d14fc5aad29141f816db8f4362c7fDale Johannesen // If the CPE is to be inserted before the instruction, that will raise 839af4b7352193e4a024d4a4e87cac1ba1589e4de57Bob Wilson // the offset of the instruction. 840d959aa421a8d14fc5aad29141f816db8f4362c7fDale Johannesen if (CPEOffset < UserOffset) 8415d9c4b60204d741c213456e21b87e9af6a3dc627Dale Johannesen UserOffset += U.CPEMI->getOperand(2).getImm(); 842d959aa421a8d14fc5aad29141f816db8f4362c7fDale Johannesen 843d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng return OffsetIsInRange(UserOffset, CPEOffset, MaxDisp, U.NegOk, U.IsSoImm); 84488e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen} 84588e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen 84688e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen/// CPEIsInRange - Returns true if the distance between specific MI and 847c0dbec7e1038ee60b8525eb1e8e3eaa6a839bd5bEvan Cheng/// specific ConstPool entry instruction can fit in MI's displacement field. 84888e37ae36652546c8e409cab69a1777af63cf095Dale Johannesenbool ARMConstantIslands::CPEIsInRange(MachineInstr *MI, unsigned UserOffset, 8495d8f1cae76e4e424bf3b4392eddb3f4dbf38662aEvan Cheng MachineInstr *CPEMI, unsigned MaxDisp, 8505d8f1cae76e4e424bf3b4392eddb3f4dbf38662aEvan Cheng bool NegOk, bool DoDump) { 8518593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen unsigned CPEOffset = GetOffsetOf(CPEMI); 8528593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen assert(CPEOffset%4 == 0 && "Misaligned CPE"); 8532021abe154e3cac523755b74fc5e62a2c9dad1fcEvan Cheng 85488e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen if (DoDump) { 855705e07f578e2b3af47ddab610feb4e7f2d3063a5Chris Lattner DEBUG(errs() << "User of CPE#" << CPEMI->getOperand(0).getImm() 856705e07f578e2b3af47ddab610feb4e7f2d3063a5Chris Lattner << " max delta=" << MaxDisp 857705e07f578e2b3af47ddab610feb4e7f2d3063a5Chris Lattner << " insn address=" << UserOffset 858705e07f578e2b3af47ddab610feb4e7f2d3063a5Chris Lattner << " CPE address=" << CPEOffset 859705e07f578e2b3af47ddab610feb4e7f2d3063a5Chris Lattner << " offset=" << int(CPEOffset-UserOffset) << "\t" << *MI); 86088e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen } 861a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 8625d8f1cae76e4e424bf3b4392eddb3f4dbf38662aEvan Cheng return OffsetIsInRange(UserOffset, CPEOffset, MaxDisp, NegOk); 863c0dbec7e1038ee60b8525eb1e8e3eaa6a839bd5bEvan Cheng} 864c0dbec7e1038ee60b8525eb1e8e3eaa6a839bd5bEvan Cheng 865d1e7d9a88b5f4fa5e9a85affc4599c650c591ffbEvan Cheng#ifndef NDEBUG 866c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng/// BBIsJumpedOver - Return true of the specified basic block's only predecessor 867c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng/// unconditionally branches to its only successor. 868c99ef085b90b32952b484e8843fb66ad65215b61Evan Chengstatic bool BBIsJumpedOver(MachineBasicBlock *MBB) { 869c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng if (MBB->pred_size() != 1 || MBB->succ_size() != 1) 870c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng return false; 871c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng 872c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng MachineBasicBlock *Succ = *MBB->succ_begin(); 873c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng MachineBasicBlock *Pred = *MBB->pred_begin(); 874c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng MachineInstr *PredMI = &Pred->back(); 8755e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin if (PredMI->getOpcode() == ARM::B || PredMI->getOpcode() == ARM::tB 8765e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin || PredMI->getOpcode() == ARM::t2B) 877c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng return PredMI->getOperand(0).getMBB() == Succ; 878c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng return false; 879c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng} 880d1e7d9a88b5f4fa5e9a85affc4599c650c591ffbEvan Cheng#endif // NDEBUG 881c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng 8828494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilsonvoid ARMConstantIslands::AdjustBBOffsetsAfter(MachineBasicBlock *BB, 8838593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen int delta) { 8848593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen MachineFunction::iterator MBBI = BB; MBBI = next(MBBI); 885d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng for(unsigned i = BB->getNumber()+1, e = BB->getParent()->getNumBlockIDs(); 886d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng i < e; ++i) { 88799c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen BBOffsets[i] += delta; 8888593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // If some existing blocks have padding, adjust the padding as needed, a 8898593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // bit tricky. delta can be negative so don't use % on that. 890d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng if (!isThumb) 891d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng continue; 892d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng MachineBasicBlock *MBB = MBBI; 893d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng if (!MBB->empty()) { 894d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng // Constant pool entries require padding. 895d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng if (MBB->begin()->getOpcode() == ARM::CONSTPOOL_ENTRY) { 8964a8ea215e69e9ca19c8acf1c236b73860188a023Evan Cheng unsigned OldOffset = BBOffsets[i] - delta; 8974a8ea215e69e9ca19c8acf1c236b73860188a023Evan Cheng if ((OldOffset%4) == 0 && (BBOffsets[i]%4) != 0) { 898d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng // add new padding 899d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng BBSizes[i] += 2; 900d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng delta += 2; 9014a8ea215e69e9ca19c8acf1c236b73860188a023Evan Cheng } else if ((OldOffset%4) != 0 && (BBOffsets[i]%4) == 0) { 902d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng // remove existing padding 9034a8ea215e69e9ca19c8acf1c236b73860188a023Evan Cheng BBSizes[i] -= 2; 904d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng delta -= 2; 9058593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen } 906d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng } 907d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng // Thumb1 jump tables require padding. They should be at the end; 908d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng // following unconditional branches are removed by AnalyzeBranch. 909789476240d6b6f8ad9366cadf790a82bd41bb0b3Evan Cheng MachineInstr *ThumbJTMI = prior(MBB->end()); 91066ac53165e17b7c76b8c69e57bde623d44ec492eEvan Cheng if (ThumbJTMI->getOpcode() == ARM::tBR_JTr) { 9114a8ea215e69e9ca19c8acf1c236b73860188a023Evan Cheng unsigned NewMIOffset = GetOffsetOf(ThumbJTMI); 9124a8ea215e69e9ca19c8acf1c236b73860188a023Evan Cheng unsigned OldMIOffset = NewMIOffset - delta; 9134a8ea215e69e9ca19c8acf1c236b73860188a023Evan Cheng if ((OldMIOffset%4) == 0 && (NewMIOffset%4) != 0) { 914d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng // remove existing padding 915d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng BBSizes[i] -= 2; 916d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng delta -= 2; 9174a8ea215e69e9ca19c8acf1c236b73860188a023Evan Cheng } else if ((OldMIOffset%4) != 0 && (NewMIOffset%4) == 0) { 918d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng // add new padding 919d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng BBSizes[i] += 2; 920d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng delta += 2; 9218593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen } 9228593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen } 923d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng if (delta==0) 924d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng return; 9258593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen } 926d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng MBBI = next(MBBI); 9278593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen } 92899c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen} 92999c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen 93088e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen/// DecrementOldEntry - find the constant pool entry with index CPI 93188e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen/// and instruction CPEMI, and decrement its refcount. If the refcount 9328494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson/// becomes 0 remove the entry and instruction. Returns true if we removed 93388e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen/// the entry, false if we didn't. 934b43216ee4a418257ce5530c02601b77efe86c354Evan Cheng 935ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Chengbool ARMConstantIslands::DecrementOldEntry(unsigned CPI, MachineInstr *CPEMI) { 936c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng // Find the old entry. Eliminate it if it is no longer used. 937ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng CPEntry *CPE = findConstPoolEntry(CPI, CPEMI); 938ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng assert(CPE && "Unexpected!"); 939ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng if (--CPE->RefCount == 0) { 940ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng RemoveDeadCPEMI(CPEMI); 941ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng CPE->CPEMI = NULL; 942c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng NumCPEs--; 94388e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen return true; 94488e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen } 94588e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen return false; 94688e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen} 94788e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen 94888e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen/// LookForCPEntryInRange - see if the currently referenced CPE is in range; 94988e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen/// if not, see if an in-range clone of the CPE is in range, and if so, 95088e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen/// change the data structures so the user references the clone. Returns: 95188e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen/// 0 = no existing entry found 95288e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen/// 1 = entry found, and there were no code insertions or deletions 95388e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen/// 2 = entry found, and there were code insertions or deletions 95488e37ae36652546c8e409cab69a1777af63cf095Dale Johannesenint ARMConstantIslands::LookForExistingCPEntry(CPUser& U, unsigned UserOffset) 95588e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen{ 95688e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen MachineInstr *UserMI = U.MI; 95788e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen MachineInstr *CPEMI = U.CPEMI; 95888e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen 95988e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // Check to see if the CPE is already in-range. 9605d8f1cae76e4e424bf3b4392eddb3f4dbf38662aEvan Cheng if (CPEIsInRange(UserMI, UserOffset, CPEMI, U.MaxDisp, U.NegOk, true)) { 961893e1c90a03a53cf13f73849324e83612688428aChris Lattner DEBUG(errs() << "In range\n"); 96288e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen return 1; 963c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng } 964c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng 96588e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // No. Look for previously created clones of the CPE that are in range. 9668aa797aa51cd4ea1ec6f46f4891a6897944b75b2Chris Lattner unsigned CPI = CPEMI->getOperand(1).getIndex(); 96788e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen std::vector<CPEntry> &CPEs = CPEntries[CPI]; 96888e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen for (unsigned i = 0, e = CPEs.size(); i != e; ++i) { 96988e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // We already tried this one 97088e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen if (CPEs[i].CPEMI == CPEMI) 97188e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen continue; 97288e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // Removing CPEs can leave empty entries, skip 97388e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen if (CPEs[i].CPEMI == NULL) 97488e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen continue; 9755d8f1cae76e4e424bf3b4392eddb3f4dbf38662aEvan Cheng if (CPEIsInRange(UserMI, UserOffset, CPEs[i].CPEMI, U.MaxDisp, U.NegOk)) { 976893e1c90a03a53cf13f73849324e83612688428aChris Lattner DEBUG(errs() << "Replacing CPE#" << CPI << " with CPE#" 977893e1c90a03a53cf13f73849324e83612688428aChris Lattner << CPEs[i].CPI << "\n"); 97888e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // Point the CPUser node to the replacement 97988e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen U.CPEMI = CPEs[i].CPEMI; 98088e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // Change the CPI in the instruction operand to refer to the clone. 98188e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen for (unsigned j = 0, e = UserMI->getNumOperands(); j != e; ++j) 982d735b8019b0f297d7c14b55adcd887af24d8e602Dan Gohman if (UserMI->getOperand(j).isCPI()) { 9838aa797aa51cd4ea1ec6f46f4891a6897944b75b2Chris Lattner UserMI->getOperand(j).setIndex(CPEs[i].CPI); 98488e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen break; 98588e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen } 98688e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // Adjust the refcount of the clone... 98788e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen CPEs[i].RefCount++; 98888e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // ...and the original. If we didn't remove the old entry, none of the 98988e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // addresses changed, so we don't need another pass. 990ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng return DecrementOldEntry(CPI, CPEMI) ? 2 : 1; 99188e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen } 99288e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen } 99388e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen return 0; 99488e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen} 99588e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen 996f1b214d3ca12f2d85f0d092b4920172bcc797bacDale Johannesen/// getUnconditionalBrDisp - Returns the maximum displacement that can fit in 997f1b214d3ca12f2d85f0d092b4920172bcc797bacDale Johannesen/// the specific unconditional branch instruction. 998f1b214d3ca12f2d85f0d092b4920172bcc797bacDale Johannesenstatic inline unsigned getUnconditionalBrDisp(int Opc) { 9995e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin switch (Opc) { 10005e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin case ARM::tB: 10015e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin return ((1<<10)-1)*2; 10025e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin case ARM::t2B: 10035e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin return ((1<<23)-1)*2; 10045e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin default: 10055e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin break; 10065e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin } 1007764ab52dd80310a205c9888bf166d09dab858f90Jim Grosbach 10085e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin return ((1<<23)-1)*4; 1009f1b214d3ca12f2d85f0d092b4920172bcc797bacDale Johannesen} 1010f1b214d3ca12f2d85f0d092b4920172bcc797bacDale Johannesen 1011b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson/// LookForWater - Look for an existing entry in the WaterList in which 1012b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen/// we can place the CPE referenced from U so it's within range of U's MI. 1013b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson/// Returns true if found, false if not. If it returns true, WaterIter 1014f98032ef64a777fe63d390539f901d7d6d4e868cBob Wilson/// is set to the WaterList entry. For Thumb, prefer water that will not 1015f98032ef64a777fe63d390539f901d7d6d4e868cBob Wilson/// introduce padding to water that will. To ensure that this pass 1016f98032ef64a777fe63d390539f901d7d6d4e868cBob Wilson/// terminates, the CPE location for a particular CPUser is only allowed to 1017f98032ef64a777fe63d390539f901d7d6d4e868cBob Wilson/// move to a lower address, so search backward from the end of the list and 1018f98032ef64a777fe63d390539f901d7d6d4e868cBob Wilson/// prefer the first water that is in range. 1019b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesenbool ARMConstantIslands::LookForWater(CPUser &U, unsigned UserOffset, 1020b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson water_iterator &WaterIter) { 10213b7573517ccd0f8f9e4bc64cf1923bae68e40d3fBob Wilson if (WaterList.empty()) 10223b7573517ccd0f8f9e4bc64cf1923bae68e40d3fBob Wilson return false; 10233b7573517ccd0f8f9e4bc64cf1923bae68e40d3fBob Wilson 102432c50e8f9920bb7835eb42926945c9a1e6385de5Bob Wilson bool FoundWaterThatWouldPad = false; 102532c50e8f9920bb7835eb42926945c9a1e6385de5Bob Wilson water_iterator IPThatWouldPad; 10263b7573517ccd0f8f9e4bc64cf1923bae68e40d3fBob Wilson for (water_iterator IP = prior(WaterList.end()), 10273b7573517ccd0f8f9e4bc64cf1923bae68e40d3fBob Wilson B = WaterList.begin();; --IP) { 10283b7573517ccd0f8f9e4bc64cf1923bae68e40d3fBob Wilson MachineBasicBlock* WaterBB = *IP; 1029b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // Check if water is in range and is either at a lower address than the 1030b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // current "high water mark" or a new water block that was created since 1031b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // the previous iteration by inserting an unconditional branch. In the 1032b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // latter case, we want to allow resetting the high water mark back to 1033b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // this new water since we haven't seen it before. Inserting branches 1034b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // should be relatively uncommon and when it does happen, we want to be 1035b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // sure to take advantage of it for all the CPEs near that block, so that 1036b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // we don't insert more branches than necessary. 1037b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson if (WaterIsInRange(UserOffset, WaterBB, U) && 1038b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson (WaterBB->getNumber() < U.HighWaterMark->getNumber() || 1039b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson NewWaterList.count(WaterBB))) { 10403b7573517ccd0f8f9e4bc64cf1923bae68e40d3fBob Wilson unsigned WBBId = WaterBB->getNumber(); 10413b7573517ccd0f8f9e4bc64cf1923bae68e40d3fBob Wilson if (isThumb && 10423b7573517ccd0f8f9e4bc64cf1923bae68e40d3fBob Wilson (BBOffsets[WBBId] + BBSizes[WBBId])%4 != 0) { 10433b7573517ccd0f8f9e4bc64cf1923bae68e40d3fBob Wilson // This is valid Water, but would introduce padding. Remember 10443b7573517ccd0f8f9e4bc64cf1923bae68e40d3fBob Wilson // it in case we don't find any Water that doesn't do this. 104532c50e8f9920bb7835eb42926945c9a1e6385de5Bob Wilson if (!FoundWaterThatWouldPad) { 104632c50e8f9920bb7835eb42926945c9a1e6385de5Bob Wilson FoundWaterThatWouldPad = true; 10473b7573517ccd0f8f9e4bc64cf1923bae68e40d3fBob Wilson IPThatWouldPad = IP; 1048f1b214d3ca12f2d85f0d092b4920172bcc797bacDale Johannesen } 10493b7573517ccd0f8f9e4bc64cf1923bae68e40d3fBob Wilson } else { 1050b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson WaterIter = IP; 10513b7573517ccd0f8f9e4bc64cf1923bae68e40d3fBob Wilson return true; 1052d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng } 105388e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen } 10543b7573517ccd0f8f9e4bc64cf1923bae68e40d3fBob Wilson if (IP == B) 10553b7573517ccd0f8f9e4bc64cf1923bae68e40d3fBob Wilson break; 105688e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen } 105732c50e8f9920bb7835eb42926945c9a1e6385de5Bob Wilson if (FoundWaterThatWouldPad) { 1058b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson WaterIter = IPThatWouldPad; 10598593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen return true; 10608593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen } 1061b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen return false; 1062b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen} 106388e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen 10648494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson/// CreateNewWater - No existing WaterList entry will work for 1065b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen/// CPUsers[CPUserIndex], so create a place to put the CPE. The end of the 1066b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen/// block is used if in range, and the conditional branch munged so control 1067b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen/// flow is correct. Otherwise the block is split to create a hole with an 1068757652c5ba820bbea75d8713d7bf3749e4113778Bob Wilson/// unconditional branch around it. In either case NewMBB is set to a 1069b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen/// block following which the new island can be inserted (the WaterList 1070b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen/// is not adjusted). 10718494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilsonvoid ARMConstantIslands::CreateNewWater(unsigned CPUserIndex, 1072757652c5ba820bbea75d8713d7bf3749e4113778Bob Wilson unsigned UserOffset, 1073757652c5ba820bbea75d8713d7bf3749e4113778Bob Wilson MachineBasicBlock *&NewMBB) { 1074b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen CPUser &U = CPUsers[CPUserIndex]; 1075b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen MachineInstr *UserMI = U.MI; 1076b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen MachineInstr *CPEMI = U.CPEMI; 1077b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen MachineBasicBlock *UserMBB = UserMI->getParent(); 10788494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson unsigned OffsetOfNextBlock = BBOffsets[UserMBB->getNumber()] + 1079b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen BBSizes[UserMBB->getNumber()]; 10808593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen assert(OffsetOfNextBlock== BBOffsets[UserMBB->getNumber()+1]); 1081b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen 108236fa5321bacf351f47d6193f56c464e6ab93b934Bob Wilson // If the block does not end in an unconditional branch already, and if the 108336fa5321bacf351f47d6193f56c464e6ab93b934Bob Wilson // end of the block is within range, make new water there. (The addition 108436fa5321bacf351f47d6193f56c464e6ab93b934Bob Wilson // below is for the unconditional branch we will be adding: 4 bytes on ARM + 108536fa5321bacf351f47d6193f56c464e6ab93b934Bob Wilson // Thumb2, 2 on Thumb1. Possible Thumb1 alignment padding is allowed for 10868593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // inside OffsetIsInRange. 108736fa5321bacf351f47d6193f56c464e6ab93b934Bob Wilson if (BBHasFallthrough(UserMBB) && 1088d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng OffsetIsInRange(UserOffset, OffsetOfNextBlock + (isThumb1 ? 2: 4), 1089d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng U.MaxDisp, U.NegOk, U.IsSoImm)) { 1090893e1c90a03a53cf13f73849324e83612688428aChris Lattner DEBUG(errs() << "Split at end of block\n"); 1091b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen if (&UserMBB->back() == UserMI) 1092b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen assert(BBHasFallthrough(UserMBB) && "Expected a fallthrough BB!"); 1093757652c5ba820bbea75d8713d7bf3749e4113778Bob Wilson NewMBB = next(MachineFunction::iterator(UserMBB)); 1094b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // Add an unconditional branch from UserMBB to fallthrough block. 1095b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // Record it for branch lengthening; this new branch will not get out of 1096b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // range, but if the preceding conditional branch is out of range, the 1097b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // targets will be exchanged, and the altered branch may be out of 1098b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // range, so the machinery has to know about it. 10995e47a9a6e46bd271eba058fb831da1a1edf8707cDavid Goodwin int UncondBr = isThumb ? ((isThumb2) ? ARM::t2B : ARM::tB) : ARM::B; 1100b67284057ee130114055309eabe0bcd1af13777dDale Johannesen BuildMI(UserMBB, DebugLoc::getUnknownLoc(), 1101757652c5ba820bbea75d8713d7bf3749e4113778Bob Wilson TII->get(UncondBr)).addMBB(NewMBB); 1102b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen unsigned MaxDisp = getUnconditionalBrDisp(UncondBr); 11038494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson ImmBranches.push_back(ImmBranch(&UserMBB->back(), 1104b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen MaxDisp, false, UncondBr)); 1105d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng int delta = isThumb1 ? 2 : 4; 1106b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen BBSizes[UserMBB->getNumber()] += delta; 1107b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen AdjustBBOffsetsAfter(UserMBB, delta); 1108b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen } else { 1109b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // What a big block. Find a place within the block to split it. 1110d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng // This is a little tricky on Thumb1 since instructions are 2 bytes 1111b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // and constant pool entries are 4 bytes: if instruction I references 1112b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // island CPE, and instruction I+1 references CPE', it will 1113b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // not work well to put CPE as far forward as possible, since then 1114b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // CPE' cannot immediately follow it (that location is 2 bytes 1115b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // farther away from I+1 than CPE was from I) and we'd need to create 11168593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // a new island. So, we make a first guess, then walk through the 11178593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // instructions between the one currently being looked at and the 11188593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // possible insertion point, and make sure any other instructions 11198593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // that reference CPEs will be able to use the same island area; 11208593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // if not, we back up the insertion point. 11218593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen 1122b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // The 4 in the following is for the unconditional branch we'll be 1123d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng // inserting (allows for long branch on Thumb1). Alignment of the 11248593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // island is handled inside OffsetIsInRange. 11258593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen unsigned BaseInsertOffset = UserOffset + U.MaxDisp -4; 1126b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // This could point off the end of the block if we've already got 1127b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // constant pool entries following this block; only the last one is 1128b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // in the water list. Back past any possible branches (allow for a 1129b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // conditional and a maximally long unconditional). 1130b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen if (BaseInsertOffset >= BBOffsets[UserMBB->getNumber()+1]) 11318494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson BaseInsertOffset = BBOffsets[UserMBB->getNumber()+1] - 1132d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng (isThumb1 ? 6 : 8); 1133b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen unsigned EndInsertOffset = BaseInsertOffset + 1134b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen CPEMI->getOperand(2).getImm(); 1135b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen MachineBasicBlock::iterator MI = UserMI; 1136b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen ++MI; 1137b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen unsigned CPUIndex = CPUserIndex+1; 113852e724ad7e679ee590f4bd763d55280586a8f1bcNicolas Geoffray for (unsigned Offset = UserOffset+TII->GetInstSizeInBytes(UserMI); 1139b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen Offset < BaseInsertOffset; 114052e724ad7e679ee590f4bd763d55280586a8f1bcNicolas Geoffray Offset += TII->GetInstSizeInBytes(MI), 1141b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen MI = next(MI)) { 1142b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen if (CPUIndex < CPUsers.size() && CPUsers[CPUIndex].MI == MI) { 1143d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng CPUser &U = CPUsers[CPUIndex]; 11448494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson if (!OffsetIsInRange(Offset, EndInsertOffset, 1145d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng U.MaxDisp, U.NegOk, U.IsSoImm)) { 1146d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng BaseInsertOffset -= (isThumb1 ? 2 : 4); 1147d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng EndInsertOffset -= (isThumb1 ? 2 : 4); 1148f1b214d3ca12f2d85f0d092b4920172bcc797bacDale Johannesen } 1149b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // This is overly conservative, as we don't account for CPEMIs 1150b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // being reused within the block, but it doesn't matter much. 1151b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen EndInsertOffset += CPUsers[CPUIndex].CPEMI->getOperand(2).getImm(); 1152b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen CPUIndex++; 1153f1b214d3ca12f2d85f0d092b4920172bcc797bacDale Johannesen } 115488e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen } 1155893e1c90a03a53cf13f73849324e83612688428aChris Lattner DEBUG(errs() << "Split in middle of big block\n"); 1156757652c5ba820bbea75d8713d7bf3749e4113778Bob Wilson NewMBB = SplitBlockBeforeInstr(prior(MI)); 1157b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen } 1158b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen} 1159b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen 1160b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen/// HandleConstantPoolUser - Analyze the specified user, checking to see if it 116139bf051ec2865cd715c41473d2a9fc34ff252534Bob Wilson/// is out-of-range. If so, pick up the constant pool value and move it some 1162b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen/// place in-range. Return true if we changed any addresses (thus must run 1163b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen/// another pass of branch lengthening), false otherwise. 11645657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Chengbool ARMConstantIslands::HandleConstantPoolUser(MachineFunction &MF, 11658494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson unsigned CPUserIndex) { 1166b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen CPUser &U = CPUsers[CPUserIndex]; 1167b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen MachineInstr *UserMI = U.MI; 1168b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen MachineInstr *CPEMI = U.CPEMI; 11698aa797aa51cd4ea1ec6f46f4891a6897944b75b2Chris Lattner unsigned CPI = CPEMI->getOperand(1).getIndex(); 1170b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen unsigned Size = CPEMI->getOperand(2).getImm(); 11718593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // Compute this only once, it's expensive. The 4 or 8 is the value the 1172a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng // hardware keeps in the PC. 1173b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen unsigned UserOffset = GetOffsetOf(UserMI) + (isThumb ? 4 : 8); 1174768c9f725bda048b3406b6289beb586ff6e933dfEvan Cheng 1175b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // See if the current entry is within range, or there is a clone of it 1176b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // in range. 1177b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen int result = LookForExistingCPEntry(U, UserOffset); 1178b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen if (result==1) return false; 1179b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen else if (result==2) return true; 1180b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen 1181b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // No existing clone of this CPE is within range. 1182b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // We will be generating a new clone. Get a UID for it. 118339bf051ec2865cd715c41473d2a9fc34ff252534Bob Wilson unsigned ID = AFI->createConstPoolEntryUId(); 1184b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen 1185f98032ef64a777fe63d390539f901d7d6d4e868cBob Wilson // Look for water where we can place this CPE. 1186b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson MachineBasicBlock *NewIsland = MF.CreateMachineBasicBlock(); 1187b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson MachineBasicBlock *NewMBB; 1188b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson water_iterator IP; 1189b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson if (LookForWater(U, UserOffset, IP)) { 1190b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson DEBUG(errs() << "found water in range\n"); 1191b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson MachineBasicBlock *WaterBB = *IP; 1192b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson 1193b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // If the original WaterList entry was "new water" on this iteration, 1194b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // propagate that to the new island. This is just keeping NewWaterList 1195b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // updated to match the WaterList, which will be updated below. 1196b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson if (NewWaterList.count(WaterBB)) { 1197b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson NewWaterList.erase(WaterBB); 1198b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson NewWaterList.insert(NewIsland); 1199b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson } 1200b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // The new CPE goes before the following block (NewMBB). 1201b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson NewMBB = next(MachineFunction::iterator(WaterBB)); 1202b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson 1203b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson } else { 1204b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen // No water found. 1205893e1c90a03a53cf13f73849324e83612688428aChris Lattner DEBUG(errs() << "No water found\n"); 1206757652c5ba820bbea75d8713d7bf3749e4113778Bob Wilson CreateNewWater(CPUserIndex, UserOffset, NewMBB); 1207b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson 1208b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // SplitBlockBeforeInstr adds to WaterList, which is important when it is 1209b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // called while handling branches so that the water will be seen on the 1210b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // next iteration for constant pools, but in this context, we don't want 1211b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // it. Check for this so it will be removed from the WaterList. 1212b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // Also remove any entry from NewWaterList. 1213b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson MachineBasicBlock *WaterBB = prior(MachineFunction::iterator(NewMBB)); 1214b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson IP = std::find(WaterList.begin(), WaterList.end(), WaterBB); 1215b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson if (IP != WaterList.end()) 1216b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson NewWaterList.erase(WaterBB); 1217b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson 1218b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // We are adding new water. Update NewWaterList. 1219b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson NewWaterList.insert(NewIsland); 122088e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen } 122188e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen 1222b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // Remove the original WaterList entry; we want subsequent insertions in 1223b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // this vicinity to go after the one we're about to insert. This 1224b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // considerably reduces the number of times we have to move the same CPE 1225b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson // more than once and is also important to ensure the algorithm terminates. 1226b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson if (IP != WaterList.end()) 1227b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson WaterList.erase(IP); 1228b923953733ee6b0f477cd767dcc16f94a0966158Bob Wilson 122988e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // Okay, we know we can put an island before NewMBB now, do it! 12305657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng MF.insert(NewMBB, NewIsland); 123188e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen 123288e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // Update internal data structures to account for the newly inserted MBB. 123388e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen UpdateForInsertedWaterBlock(NewIsland); 123488e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen 123588e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // Decrement the old entry, and remove it if refcount becomes 0. 1236ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng DecrementOldEntry(CPI, CPEMI); 123788e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen 123888e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // Now that we have an island to add the CPE to, clone the original CPE and 123988e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen // add it to the island. 1240549dda9d82a5ec0a0cbf429a18d33a8e66062424Bob Wilson U.HighWaterMark = NewIsland; 1241b67284057ee130114055309eabe0bcd1af13777dDale Johannesen U.CPEMI = BuildMI(NewIsland, DebugLoc::getUnknownLoc(), 1242b67284057ee130114055309eabe0bcd1af13777dDale Johannesen TII->get(ARM::CONSTPOOL_ENTRY)) 1243a8e2989ece6dc46df59b0768184028257f913843Evan Cheng .addImm(ID).addConstantPoolIndex(CPI).addImm(Size); 124488e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen CPEntries[CPI].push_back(CPEntry(U.CPEMI, ID, 1)); 1245c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng NumCPEs++; 1246c99ef085b90b32952b484e8843fb66ad65215b61Evan Cheng 12478593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen BBOffsets[NewIsland->getNumber()] = BBOffsets[NewMBB->getNumber()]; 1248b43216ee4a418257ce5530c02601b77efe86c354Evan Cheng // Compensate for .align 2 in thumb mode. 12498494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson if (isThumb && BBOffsets[NewIsland->getNumber()]%4 != 0) 12508593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen Size += 2; 1251a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Increase the size of the island block to account for the new entry. 1252a8e2989ece6dc46df59b0768184028257f913843Evan Cheng BBSizes[NewIsland->getNumber()] += Size; 125399c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen AdjustBBOffsetsAfter(NewIsland, Size); 12548494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 1255a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Finally, change the CPI in the instruction operand to be ID. 1256a8e2989ece6dc46df59b0768184028257f913843Evan Cheng for (unsigned i = 0, e = UserMI->getNumOperands(); i != e; ++i) 1257d735b8019b0f297d7c14b55adcd887af24d8e602Dan Gohman if (UserMI->getOperand(i).isCPI()) { 12588aa797aa51cd4ea1ec6f46f4891a6897944b75b2Chris Lattner UserMI->getOperand(i).setIndex(ID); 1259a8e2989ece6dc46df59b0768184028257f913843Evan Cheng break; 1260a8e2989ece6dc46df59b0768184028257f913843Evan Cheng } 12618494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 1262705e07f578e2b3af47ddab610feb4e7f2d3063a5Chris Lattner DEBUG(errs() << " Moved CPE to #" << ID << " CPI=" << CPI 1263705e07f578e2b3af47ddab610feb4e7f2d3063a5Chris Lattner << '\t' << *UserMI); 12648494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 1265a8e2989ece6dc46df59b0768184028257f913843Evan Cheng return true; 1266a8e2989ece6dc46df59b0768184028257f913843Evan Cheng} 1267a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 1268ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng/// RemoveDeadCPEMI - Remove a dead constant pool entry instruction. Update 1269ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng/// sizes and offsets of impacted basic blocks. 1270ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Chengvoid ARMConstantIslands::RemoveDeadCPEMI(MachineInstr *CPEMI) { 1271ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng MachineBasicBlock *CPEBB = CPEMI->getParent(); 12728593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen unsigned Size = CPEMI->getOperand(2).getImm(); 12738593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen CPEMI->eraseFromParent(); 12748593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen BBSizes[CPEBB->getNumber()] -= Size; 12758593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // All succeeding offsets have the current size value added in, fix this. 1276ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng if (CPEBB->empty()) { 1277d3d9d66dd211d1267e764c7294876d9a227f04caEvan Cheng // In thumb1 mode, the size of island may be padded by two to compensate for 12788593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // the alignment requirement. Then it will now be 2 when the block is 1279ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng // empty, so fix this. 1280ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng // All succeeding offsets have the current size value added in, fix this. 1281ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng if (BBSizes[CPEBB->getNumber()] != 0) { 12828593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen Size += BBSizes[CPEBB->getNumber()]; 1283ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng BBSizes[CPEBB->getNumber()] = 0; 1284ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng } 1285ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng } 12868593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen AdjustBBOffsetsAfter(CPEBB, -Size); 12878593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // An island has only one predecessor BB and one successor BB. Check if 12888593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // this BB's predecessor jumps directly to this BB's successor. This 12898593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // shouldn't happen currently. 12908593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen assert(!BBIsJumpedOver(CPEBB) && "How did this happen?"); 12918593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // FIXME: remove the empty blocks after all the work is done? 1292ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng} 1293ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng 1294ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng/// RemoveUnusedCPEntries - Remove constant pool entries whose refcounts 1295ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng/// are zero. 1296ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Chengbool ARMConstantIslands::RemoveUnusedCPEntries() { 1297ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng unsigned MadeChange = false; 1298ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng for (unsigned i = 0, e = CPEntries.size(); i != e; ++i) { 1299ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng std::vector<CPEntry> &CPEs = CPEntries[i]; 1300ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng for (unsigned j = 0, ee = CPEs.size(); j != ee; ++j) { 1301ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng if (CPEs[j].RefCount == 0 && CPEs[j].CPEMI) { 1302ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng RemoveDeadCPEMI(CPEs[j].CPEMI); 1303ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng CPEs[j].CPEMI = NULL; 1304ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng MadeChange = true; 1305ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng } 1306ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng } 13078494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson } 1308ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng return MadeChange; 1309ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng} 1310ed884f3a2f7225a0ea40fc18964b6f949cac3680Evan Cheng 131188e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen/// BBIsInRange - Returns true if the distance between specific MI and 131243aeab68a69e443c528092b4424a498d813f96b7Evan Cheng/// specific BB can fit in MI's displacement field. 1313c0dbec7e1038ee60b8525eb1e8e3eaa6a839bd5bEvan Chengbool ARMConstantIslands::BBIsInRange(MachineInstr *MI,MachineBasicBlock *DestBB, 1314c0dbec7e1038ee60b8525eb1e8e3eaa6a839bd5bEvan Cheng unsigned MaxDisp) { 1315b71aa2b6ca801d407c702483c412a290ab4af3b2Dale Johannesen unsigned PCAdj = isThumb ? 4 : 8; 1316c0dbec7e1038ee60b8525eb1e8e3eaa6a839bd5bEvan Cheng unsigned BrOffset = GetOffsetOf(MI) + PCAdj; 131799c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen unsigned DestOffset = BBOffsets[DestBB->getNumber()]; 131843aeab68a69e443c528092b4424a498d813f96b7Evan Cheng 1319705e07f578e2b3af47ddab610feb4e7f2d3063a5Chris Lattner DEBUG(errs() << "Branch of destination BB#" << DestBB->getNumber() 1320705e07f578e2b3af47ddab610feb4e7f2d3063a5Chris Lattner << " from BB#" << MI->getParent()->getNumber() 1321705e07f578e2b3af47ddab610feb4e7f2d3063a5Chris Lattner << " max delta=" << MaxDisp 1322705e07f578e2b3af47ddab610feb4e7f2d3063a5Chris Lattner << " from " << GetOffsetOf(MI) << " to " << DestOffset 1323705e07f578e2b3af47ddab610feb4e7f2d3063a5Chris Lattner << " offset " << int(DestOffset-BrOffset) << "\t" << *MI); 1324c0dbec7e1038ee60b8525eb1e8e3eaa6a839bd5bEvan Cheng 13258593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen if (BrOffset <= DestOffset) { 13268593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // Branch before the Dest. 13278593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen if (DestOffset-BrOffset <= MaxDisp) 13288593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen return true; 13298593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen } else { 13308593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen if (BrOffset-DestOffset <= MaxDisp) 13318593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen return true; 13328593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen } 13338593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen return false; 133443aeab68a69e443c528092b4424a498d813f96b7Evan Cheng} 133543aeab68a69e443c528092b4424a498d813f96b7Evan Cheng 1336d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng/// FixUpImmediateBr - Fix up an immediate branch whose destination is too far 1337d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng/// away to fit in its displacement field. 13385657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Chengbool ARMConstantIslands::FixUpImmediateBr(MachineFunction &MF, ImmBranch &Br) { 1339d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng MachineInstr *MI = Br.MI; 13408aa797aa51cd4ea1ec6f46f4891a6897944b75b2Chris Lattner MachineBasicBlock *DestBB = MI->getOperand(0).getMBB(); 1341d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng 1342c0dbec7e1038ee60b8525eb1e8e3eaa6a839bd5bEvan Cheng // Check to see if the DestBB is already in-range. 1343c0dbec7e1038ee60b8525eb1e8e3eaa6a839bd5bEvan Cheng if (BBIsInRange(MI, DestBB, Br.MaxDisp)) 1344d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng return false; 1345d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng 1346d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng if (!Br.isCond) 13475657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng return FixUpUnconditionalBr(MF, Br); 13485657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng return FixUpConditionalBr(MF, Br); 1349d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng} 1350d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng 135188e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen/// FixUpUnconditionalBr - Fix up an unconditional branch whose destination is 135288e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen/// too far away to fit in its displacement field. If the LR register has been 1353d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng/// spilled in the epilogue, then we can use BL to implement a far jump. 135439bf051ec2865cd715c41473d2a9fc34ff252534Bob Wilson/// Otherwise, add an intermediate branch instruction to a branch. 1355d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Chengbool 13565657c01949dca6c012ac60d242d1a8d2ffdf5603Evan ChengARMConstantIslands::FixUpUnconditionalBr(MachineFunction &MF, ImmBranch &Br) { 1357d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng MachineInstr *MI = Br.MI; 1358d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng MachineBasicBlock *MBB = MI->getParent(); 135953c67c0218d8420234dd71bf2d9df3388909af77Evan Cheng if (!isThumb1) 136053c67c0218d8420234dd71bf2d9df3388909af77Evan Cheng llvm_unreachable("FixUpUnconditionalBr is Thumb1 only!"); 1361d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng 1362d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng // Use BL to implement far jump. 1363d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng Br.MaxDisp = (1 << 21) * 2; 13645080f4d9919d39b367891dc51e739c571a66036cChris Lattner MI->setDesc(TII->get(ARM::tBfar)); 1365d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng BBSizes[MBB->getNumber()] += 2; 136699c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen AdjustBBOffsetsAfter(MBB, 2); 1367d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng HasFarJump = true; 1368d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng NumUBrFixed++; 1369bd5d3dbdbe46c7325545a7cb8c891c0347375451Evan Cheng 1370705e07f578e2b3af47ddab610feb4e7f2d3063a5Chris Lattner DEBUG(errs() << " Changed B to long jump " << *MI); 1371bd5d3dbdbe46c7325545a7cb8c891c0347375451Evan Cheng 1372d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng return true; 1373d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng} 1374d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng 137588e37ae36652546c8e409cab69a1777af63cf095Dale Johannesen/// FixUpConditionalBr - Fix up a conditional branch whose destination is too 1376d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng/// far away to fit in its displacement field. It is converted to an inverse 1377d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng/// conditional branch + an unconditional branch to the destination. 1378af5cbcb809bdbd30ebacab942994721c134d16a2Evan Chengbool 13795657c01949dca6c012ac60d242d1a8d2ffdf5603Evan ChengARMConstantIslands::FixUpConditionalBr(MachineFunction &MF, ImmBranch &Br) { 1380af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng MachineInstr *MI = Br.MI; 13818aa797aa51cd4ea1ec6f46f4891a6897944b75b2Chris Lattner MachineBasicBlock *DestBB = MI->getOperand(0).getMBB(); 1382af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng 138339bf051ec2865cd715c41473d2a9fc34ff252534Bob Wilson // Add an unconditional branch to the destination and invert the branch 1384d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng // condition to jump over it: 1385af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng // blt L1 1386af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng // => 1387af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng // bge L2 1388af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng // b L1 1389af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng // L2: 13909a1ceaedc282f0cae31f2723f4d6c00c7b88fe90Chris Lattner ARMCC::CondCodes CC = (ARMCC::CondCodes)MI->getOperand(1).getImm(); 1391af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng CC = ARMCC::getOppositeCondition(CC); 13920e1d37904abbf7e8c4c478408253dd995f3040f4Evan Cheng unsigned CCReg = MI->getOperand(2).getReg(); 1393af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng 1394af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng // If the branch is at the end of its MBB and that has a fall-through block, 1395af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng // direct the updated conditional branch to the fall-through block. Otherwise, 1396af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng // split the MBB before the next instruction. 1397af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng MachineBasicBlock *MBB = MI->getParent(); 1398bd5d3dbdbe46c7325545a7cb8c891c0347375451Evan Cheng MachineInstr *BMI = &MBB->back(); 1399bd5d3dbdbe46c7325545a7cb8c891c0347375451Evan Cheng bool NeedSplit = (BMI != MI) || !BBHasFallthrough(MBB); 140043aeab68a69e443c528092b4424a498d813f96b7Evan Cheng 1401d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng NumCBrFixed++; 1402bd5d3dbdbe46c7325545a7cb8c891c0347375451Evan Cheng if (BMI != MI) { 14038e5f2c6f65841542e2a7092553fe42a00048e4c7Dan Gohman if (next(MachineBasicBlock::iterator(MI)) == prior(MBB->end()) && 1404bd5d3dbdbe46c7325545a7cb8c891c0347375451Evan Cheng BMI->getOpcode() == Br.UncondBr) { 140539bf051ec2865cd715c41473d2a9fc34ff252534Bob Wilson // Last MI in the BB is an unconditional branch. Can we simply invert the 140643aeab68a69e443c528092b4424a498d813f96b7Evan Cheng // condition and swap destinations: 140743aeab68a69e443c528092b4424a498d813f96b7Evan Cheng // beq L1 140843aeab68a69e443c528092b4424a498d813f96b7Evan Cheng // b L2 140943aeab68a69e443c528092b4424a498d813f96b7Evan Cheng // => 141043aeab68a69e443c528092b4424a498d813f96b7Evan Cheng // bne L2 141143aeab68a69e443c528092b4424a498d813f96b7Evan Cheng // b L1 14128aa797aa51cd4ea1ec6f46f4891a6897944b75b2Chris Lattner MachineBasicBlock *NewDest = BMI->getOperand(0).getMBB(); 1413c0dbec7e1038ee60b8525eb1e8e3eaa6a839bd5bEvan Cheng if (BBIsInRange(MI, NewDest, Br.MaxDisp)) { 1414705e07f578e2b3af47ddab610feb4e7f2d3063a5Chris Lattner DEBUG(errs() << " Invert Bcc condition and swap its destination with " 1415705e07f578e2b3af47ddab610feb4e7f2d3063a5Chris Lattner << *BMI); 14168aa797aa51cd4ea1ec6f46f4891a6897944b75b2Chris Lattner BMI->getOperand(0).setMBB(DestBB); 14178aa797aa51cd4ea1ec6f46f4891a6897944b75b2Chris Lattner MI->getOperand(0).setMBB(NewDest); 141843aeab68a69e443c528092b4424a498d813f96b7Evan Cheng MI->getOperand(1).setImm(CC); 141943aeab68a69e443c528092b4424a498d813f96b7Evan Cheng return true; 142043aeab68a69e443c528092b4424a498d813f96b7Evan Cheng } 142143aeab68a69e443c528092b4424a498d813f96b7Evan Cheng } 142243aeab68a69e443c528092b4424a498d813f96b7Evan Cheng } 142343aeab68a69e443c528092b4424a498d813f96b7Evan Cheng 142443aeab68a69e443c528092b4424a498d813f96b7Evan Cheng if (NeedSplit) { 1425af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng SplitBlockBeforeInstr(MI); 142639bf051ec2865cd715c41473d2a9fc34ff252534Bob Wilson // No need for the branch to the next block. We're adding an unconditional 1427dd353b8ad747a8731a191848ff5db978a70bd0fbEvan Cheng // branch to the destination. 142852e724ad7e679ee590f4bd763d55280586a8f1bcNicolas Geoffray int delta = TII->GetInstSizeInBytes(&MBB->back()); 142956c42ef3e43f8eb75c435e781d0ac8251c7588a1Dale Johannesen BBSizes[MBB->getNumber()] -= delta; 14308593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen MachineBasicBlock* SplitBB = next(MachineFunction::iterator(MBB)); 14318593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen AdjustBBOffsetsAfter(SplitBB, -delta); 1432dd353b8ad747a8731a191848ff5db978a70bd0fbEvan Cheng MBB->back().eraseFromParent(); 14338593e418555fdae21a070357fd8734b4069c17d0Dale Johannesen // BBOffsets[SplitBB] is wrong temporarily, fixed below 1434dd353b8ad747a8731a191848ff5db978a70bd0fbEvan Cheng } 1435af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng MachineBasicBlock *NextBB = next(MachineFunction::iterator(MBB)); 14368494526a2396fd9cde027ab6ae11dd28b54ac90eBob Wilson 1437893e1c90a03a53cf13f73849324e83612688428aChris Lattner DEBUG(errs() << " Insert B to BB#" << DestBB->getNumber() 1438893e1c90a03a53cf13f73849324e83612688428aChris Lattner << " also invert condition and change dest. to BB#" 1439893e1c90a03a53cf13f73849324e83612688428aChris Lattner << NextBB->getNumber() << "\n"); 1440af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng 144156c42ef3e43f8eb75c435e781d0ac8251c7588a1Dale Johannesen // Insert a new conditional branch and a new unconditional branch. 1442af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng // Also update the ImmBranch as well as adding a new entry for the new branch. 1443b67284057ee130114055309eabe0bcd1af13777dDale Johannesen BuildMI(MBB, DebugLoc::getUnknownLoc(), 1444b67284057ee130114055309eabe0bcd1af13777dDale Johannesen TII->get(MI->getOpcode())) 1445b67284057ee130114055309eabe0bcd1af13777dDale Johannesen .addMBB(NextBB).addImm(CC).addReg(CCReg); 1446af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng Br.MI = &MBB->back(); 144752e724ad7e679ee590f4bd763d55280586a8f1bcNicolas Geoffray BBSizes[MBB->getNumber()] += TII->GetInstSizeInBytes(&MBB->back()); 1448b67284057ee130114055309eabe0bcd1af13777dDale Johannesen BuildMI(MBB, DebugLoc::getUnknownLoc(), TII->get(Br.UncondBr)).addMBB(DestBB); 144952e724ad7e679ee590f4bd763d55280586a8f1bcNicolas Geoffray BBSizes[MBB->getNumber()] += TII->GetInstSizeInBytes(&MBB->back()); 1450a9b8b8d62c67e96bc4dc2ed25298c539102f8638Evan Cheng unsigned MaxDisp = getUnconditionalBrDisp(Br.UncondBr); 1451a0bf794eb60b6795a121efcb9ff759e9e0955772Evan Cheng ImmBranches.push_back(ImmBranch(&MBB->back(), MaxDisp, false, Br.UncondBr)); 145256c42ef3e43f8eb75c435e781d0ac8251c7588a1Dale Johannesen 145356c42ef3e43f8eb75c435e781d0ac8251c7588a1Dale Johannesen // Remove the old conditional branch. It may or may not still be in MBB. 145452e724ad7e679ee590f4bd763d55280586a8f1bcNicolas Geoffray BBSizes[MI->getParent()->getNumber()] -= TII->GetInstSizeInBytes(MI); 1455af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng MI->eraseFromParent(); 1456af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng 145756c42ef3e43f8eb75c435e781d0ac8251c7588a1Dale Johannesen // The net size change is an addition of one unconditional branch. 145852e724ad7e679ee590f4bd763d55280586a8f1bcNicolas Geoffray int delta = TII->GetInstSizeInBytes(&MBB->back()); 145999c49a4b94ffabdd22f55e8274c7f92892e25559Dale Johannesen AdjustBBOffsetsAfter(MBB, delta); 1460af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng return true; 1461af5cbcb809bdbd30ebacab942994721c134d16a2Evan Cheng} 1462d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng 1463d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng/// UndoLRSpillRestore - Remove Thumb push / pop instructions that only spills 14644b322e58b77d16f103d88a3af3a4ebd2675245a0Evan Cheng/// LR / restores LR to pc. FIXME: This is done here because it's only possible 14654b322e58b77d16f103d88a3af3a4ebd2675245a0Evan Cheng/// to do this if tBfar is not used. 1466d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Chengbool ARMConstantIslands::UndoLRSpillRestore() { 1467d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng bool MadeChange = false; 1468d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng for (unsigned i = 0, e = PushPopMIs.size(); i != e; ++i) { 1469d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng MachineInstr *MI = PushPopMIs[i]; 147010469f8e48e007989b0469e677d4000a1311ecd2Evan Cheng // First two operands are predicates, the third is a zero since there 147110469f8e48e007989b0469e677d4000a1311ecd2Evan Cheng // is no writeback. 147244bec52b1b7e9a3ac1efbae90db240b8c1ca2ad4Evan Cheng if (MI->getOpcode() == ARM::tPOP_RET && 147310469f8e48e007989b0469e677d4000a1311ecd2Evan Cheng MI->getOperand(3).getReg() == ARM::PC && 147410469f8e48e007989b0469e677d4000a1311ecd2Evan Cheng MI->getNumExplicitOperands() == 4) { 1475b67284057ee130114055309eabe0bcd1af13777dDale Johannesen BuildMI(MI->getParent(), MI->getDebugLoc(), TII->get(ARM::tBX_RET)); 147644bec52b1b7e9a3ac1efbae90db240b8c1ca2ad4Evan Cheng MI->eraseFromParent(); 147744bec52b1b7e9a3ac1efbae90db240b8c1ca2ad4Evan Cheng MadeChange = true; 1478d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng } 1479d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng } 1480d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng return MadeChange; 1481d1b2c1e88fe4a7728ca9739b0f1c6fd90a19c5fdEvan Cheng} 14825657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng 1483a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Chengbool ARMConstantIslands::OptimizeThumb2Instructions(MachineFunction &MF) { 1484a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng bool MadeChange = false; 1485a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng 1486a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng // Shrink ADR and LDR from constantpool. 1487a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng for (unsigned i = 0, e = CPUsers.size(); i != e; ++i) { 1488a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng CPUser &U = CPUsers[i]; 1489a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng unsigned Opcode = U.MI->getOpcode(); 1490a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng unsigned NewOpc = 0; 1491a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng unsigned Scale = 1; 1492a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng unsigned Bits = 0; 1493a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng switch (Opcode) { 1494a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng default: break; 1495a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng case ARM::t2LEApcrel: 1496a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng if (isARMLowRegister(U.MI->getOperand(0).getReg())) { 1497a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng NewOpc = ARM::tLEApcrel; 1498a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng Bits = 8; 1499a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng Scale = 4; 1500a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng } 1501a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng break; 1502a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng case ARM::t2LDRpci: 1503a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng if (isARMLowRegister(U.MI->getOperand(0).getReg())) { 1504a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng NewOpc = ARM::tLDRpci; 1505a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng Bits = 8; 1506a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng Scale = 4; 1507a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng } 1508a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng break; 1509a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng } 1510a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng 1511a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng if (!NewOpc) 1512a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng continue; 1513a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng 1514a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng unsigned UserOffset = GetOffsetOf(U.MI) + 4; 1515a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng unsigned MaxOffs = ((1 << Bits) - 1) * Scale; 1516a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng // FIXME: Check if offset is multiple of scale if scale is not 4. 1517a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng if (CPEIsInRange(U.MI, UserOffset, U.CPEMI, MaxOffs, false, true)) { 1518a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng U.MI->setDesc(TII->get(NewOpc)); 1519a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng MachineBasicBlock *MBB = U.MI->getParent(); 1520a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng BBSizes[MBB->getNumber()] -= 2; 1521a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng AdjustBBOffsetsAfter(MBB, -2); 1522a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng ++NumT2CPShrunk; 1523a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng MadeChange = true; 1524a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng } 1525a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng } 1526a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng 1527a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng MadeChange |= OptimizeThumb2Branches(MF); 152801dec0e545de18aadcd3911563a93d10a625be80Jim Grosbach MadeChange |= OptimizeThumb2JumpTables(MF); 1529a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng return MadeChange; 1530a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng} 1531a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng 1532a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Chengbool ARMConstantIslands::OptimizeThumb2Branches(MachineFunction &MF) { 153331b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng bool MadeChange = false; 153431b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng 153531b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng for (unsigned i = 0, e = ImmBranches.size(); i != e; ++i) { 153631b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng ImmBranch &Br = ImmBranches[i]; 153731b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng unsigned Opcode = Br.MI->getOpcode(); 153831b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng unsigned NewOpc = 0; 153931b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng unsigned Scale = 1; 154031b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng unsigned Bits = 0; 154131b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng switch (Opcode) { 154231b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng default: break; 154331b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng case ARM::t2B: 154431b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng NewOpc = ARM::tB; 154531b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng Bits = 11; 154631b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng Scale = 2; 154731b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng break; 1548de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng case ARM::t2Bcc: { 154931b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng NewOpc = ARM::tBcc; 155031b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng Bits = 8; 1551de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng Scale = 2; 155231b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng break; 155331b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng } 1554de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng } 1555de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng if (NewOpc) { 1556de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng unsigned MaxOffs = ((1 << (Bits-1))-1) * Scale; 1557de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng MachineBasicBlock *DestBB = Br.MI->getOperand(0).getMBB(); 1558de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng if (BBIsInRange(Br.MI, DestBB, MaxOffs)) { 1559de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng Br.MI->setDesc(TII->get(NewOpc)); 1560de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng MachineBasicBlock *MBB = Br.MI->getParent(); 1561de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng BBSizes[MBB->getNumber()] -= 2; 1562de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng AdjustBBOffsetsAfter(MBB, -2); 1563de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng ++NumT2BrShrunk; 1564de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng MadeChange = true; 1565de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng } 1566de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng } 1567de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng 1568de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng Opcode = Br.MI->getOpcode(); 1569de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng if (Opcode != ARM::tBcc) 157031b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng continue; 157131b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng 1572de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng NewOpc = 0; 1573de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng unsigned PredReg = 0; 1574de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng ARMCC::CondCodes Pred = llvm::getInstrPredicate(Br.MI, PredReg); 1575de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng if (Pred == ARMCC::EQ) 1576de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng NewOpc = ARM::tCBZ; 1577de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng else if (Pred == ARMCC::NE) 1578de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng NewOpc = ARM::tCBNZ; 1579de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng if (!NewOpc) 1580de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng continue; 158131b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng MachineBasicBlock *DestBB = Br.MI->getOperand(0).getMBB(); 1582de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng // Check if the distance is within 126. Subtract starting offset by 2 1583de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng // because the cmp will be eliminated. 1584de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng unsigned BrOffset = GetOffsetOf(Br.MI) + 4 - 2; 1585de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng unsigned DestOffset = BBOffsets[DestBB->getNumber()]; 1586de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng if (BrOffset < DestOffset && (DestOffset - BrOffset) <= 126) { 1587de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng MachineBasicBlock::iterator CmpMI = Br.MI; --CmpMI; 1588de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng if (CmpMI->getOpcode() == ARM::tCMPzi8) { 1589de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng unsigned Reg = CmpMI->getOperand(0).getReg(); 1590de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng Pred = llvm::getInstrPredicate(CmpMI, PredReg); 1591de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng if (Pred == ARMCC::AL && 1592de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng CmpMI->getOperand(1).getImm() == 0 && 1593de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng isARMLowRegister(Reg)) { 1594de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng MachineBasicBlock *MBB = Br.MI->getParent(); 1595de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng MachineInstr *NewBR = 1596de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng BuildMI(*MBB, CmpMI, Br.MI->getDebugLoc(), TII->get(NewOpc)) 1597de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng .addReg(Reg).addMBB(DestBB, Br.MI->getOperand(0).getTargetFlags()); 1598de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng CmpMI->eraseFromParent(); 1599de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng Br.MI->eraseFromParent(); 1600de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng Br.MI = NewBR; 1601de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng BBSizes[MBB->getNumber()] -= 2; 1602de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng AdjustBBOffsetsAfter(MBB, -2); 1603de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng ++NumCBZ; 1604de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng MadeChange = true; 1605de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng } 1606de17fb6e4dd8f169f707d58d4e124c8d4d2c7dbaEvan Cheng } 160731b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng } 160831b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng } 160931b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng 161031b99dd76035067b1c3cc6c7e9d663b7b0210938Evan Cheng return MadeChange; 1611a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng} 1612a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng 1613a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng/// OptimizeThumb2JumpTables - Use tbb / tbh instructions to generate smaller 1614a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng/// jumptables when it's possible. 16155657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Chengbool ARMConstantIslands::OptimizeThumb2JumpTables(MachineFunction &MF) { 16165657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng bool MadeChange = false; 16175657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng 16185657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng // FIXME: After the tables are shrunk, can we get rid some of the 16195657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng // constantpool tables? 16201fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach MachineJumpTableInfo *MJTI = MF.getJumpTableInfo(); 16215657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables(); 16225657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng for (unsigned i = 0, e = T2JumpTables.size(); i != e; ++i) { 16235657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng MachineInstr *MI = T2JumpTables[i]; 16245657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng const TargetInstrDesc &TID = MI->getDesc(); 16255657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng unsigned NumOps = TID.getNumOperands(); 16265657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng unsigned JTOpIdx = NumOps - (TID.isPredicable() ? 3 : 2); 16275657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng MachineOperand JTOP = MI->getOperand(JTOpIdx); 16285657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng unsigned JTI = JTOP.getIndex(); 16295657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng assert(JTI < JT.size()); 16305657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng 16311fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach bool ByteOk = true; 16321fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach bool HalfWordOk = true; 163380697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach unsigned JTOffset = GetOffsetOf(MI) + 4; 163480697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs; 16355657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng for (unsigned j = 0, ee = JTBBs.size(); j != ee; ++j) { 16365657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng MachineBasicBlock *MBB = JTBBs[j]; 16375657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng unsigned DstOffset = BBOffsets[MBB->getNumber()]; 16388770f747a98194056805f1b7cbcb0b75a7633b87Evan Cheng // Negative offset is not ok. FIXME: We should change BB layout to make 16398770f747a98194056805f1b7cbcb0b75a7633b87Evan Cheng // sure all the branches are forward. 1640d26b14c34cbcee1448b86b524578fc51cc979023Evan Cheng if (ByteOk && (DstOffset - JTOffset) > ((1<<8)-1)*2) 16415657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng ByteOk = false; 164225f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng unsigned TBHLimit = ((1<<16)-1)*2; 164325f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng if (HalfWordOk && (DstOffset - JTOffset) > TBHLimit) 16445657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng HalfWordOk = false; 16455657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng if (!ByteOk && !HalfWordOk) 16465657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng break; 16475657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng } 16485657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng 16495657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng if (ByteOk || HalfWordOk) { 16505657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng MachineBasicBlock *MBB = MI->getParent(); 16515657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng unsigned BaseReg = MI->getOperand(0).getReg(); 16525657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng bool BaseRegKill = MI->getOperand(0).isKill(); 16535657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng if (!BaseRegKill) 16545657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng continue; 16555657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng unsigned IdxReg = MI->getOperand(1).getReg(); 16565657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng bool IdxRegKill = MI->getOperand(1).isKill(); 16575657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng MachineBasicBlock::iterator PrevI = MI; 16585657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng if (PrevI == MBB->begin()) 16595657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng continue; 16605657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng 16615657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng MachineInstr *AddrMI = --PrevI; 16625657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng bool OptOk = true; 16635657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng // Examine the instruction that calculate the jumptable entry address. 16645657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng // If it's not the one just before the t2BR_JT, we won't delete it, then 16655657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng // it's not worth doing the optimization. 16665657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng for (unsigned k = 0, eee = AddrMI->getNumOperands(); k != eee; ++k) { 16675657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng const MachineOperand &MO = AddrMI->getOperand(k); 16685657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng if (!MO.isReg() || !MO.getReg()) 16695657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng continue; 16705657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng if (MO.isDef() && MO.getReg() != BaseReg) { 16715657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng OptOk = false; 16725657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng break; 16735657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng } 16745657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng if (MO.isUse() && !MO.isKill() && MO.getReg() != IdxReg) { 16755657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng OptOk = false; 16765657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng break; 16775657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng } 16785657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng } 16795657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng if (!OptOk) 16805657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng continue; 16815657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng 1682a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng // The previous instruction should be a tLEApcrel or t2LEApcrelJT, we want 1683a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng // to delete it as well. 16845657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng MachineInstr *LeaMI = --PrevI; 1685a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng if ((LeaMI->getOpcode() != ARM::tLEApcrelJT && 1686a1efbbdbf3217598f334a6f39dab84ca06f5de41Evan Cheng LeaMI->getOpcode() != ARM::t2LEApcrelJT) || 16875657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng LeaMI->getOperand(0).getReg() != BaseReg) 168825f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng OptOk = false; 168925f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng 169025f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng if (!OptOk) 169125f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng continue; 169225f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng 169325f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng unsigned Opc = ByteOk ? ARM::t2TBB : ARM::t2TBH; 169425f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng MachineInstr *NewJTMI = BuildMI(MBB, MI->getDebugLoc(), TII->get(Opc)) 169525f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng .addReg(IdxReg, getKillRegState(IdxRegKill)) 169625f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng .addJumpTableIndex(JTI, JTOP.getTargetFlags()) 169725f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng .addImm(MI->getOperand(JTOpIdx+1).getImm()); 169825f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng // FIXME: Insert an "ALIGN" instruction to ensure the next instruction 169925f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng // is 2-byte aligned. For now, asm printer will fix it up. 170025f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng unsigned NewSize = TII->GetInstSizeInBytes(NewJTMI); 170125f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng unsigned OrigSize = TII->GetInstSizeInBytes(AddrMI); 170225f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng OrigSize += TII->GetInstSizeInBytes(LeaMI); 170325f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng OrigSize += TII->GetInstSizeInBytes(MI); 170425f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng 170525f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng AddrMI->eraseFromParent(); 170625f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng LeaMI->eraseFromParent(); 170725f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng MI->eraseFromParent(); 170825f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng 170925f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng int delta = OrigSize - NewSize; 171025f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng BBSizes[MBB->getNumber()] -= delta; 171125f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng AdjustBBOffsetsAfter(MBB, -delta); 171225f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng 171325f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng ++NumTBs; 171425f7cfc3cccba6f569f29f79ea533bae960b93c0Evan Cheng MadeChange = true; 17155657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng } 17165657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng } 17175657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng 17185657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng return MadeChange; 17195657c01949dca6c012ac60d242d1a8d2ffdf5603Evan Cheng} 17201fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach 172180697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach/// ReorderThumb2JumpTables - Use tbb / tbh instructions to generate smaller 172280697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach/// jumptables when it's possible. 172380697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbachbool ARMConstantIslands::ReorderThumb2JumpTables(MachineFunction &MF) { 172480697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach bool MadeChange = false; 172580697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach 172680697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach MachineJumpTableInfo *MJTI = MF.getJumpTableInfo(); 172780697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables(); 172880697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach for (unsigned i = 0, e = T2JumpTables.size(); i != e; ++i) { 172980697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach MachineInstr *MI = T2JumpTables[i]; 173080697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach const TargetInstrDesc &TID = MI->getDesc(); 173180697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach unsigned NumOps = TID.getNumOperands(); 173280697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach unsigned JTOpIdx = NumOps - (TID.isPredicable() ? 3 : 2); 173380697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach MachineOperand JTOP = MI->getOperand(JTOpIdx); 173480697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach unsigned JTI = JTOP.getIndex(); 173580697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach assert(JTI < JT.size()); 173680697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach 173780697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach // We prefer if target blocks for the jump table come after the jump 173880697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach // instruction so we can use TB[BH]. Loop through the target blocks 173980697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach // and try to adjust them such that that's true. 174080697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach unsigned JTOffset = GetOffsetOf(MI) + 4; 174180697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs; 174280697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach for (unsigned j = 0, ee = JTBBs.size(); j != ee; ++j) { 174380697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach MachineBasicBlock *MBB = JTBBs[j]; 174480697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach unsigned DstOffset = BBOffsets[MBB->getNumber()]; 174580697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach 174680697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach if (DstOffset < JTOffset) { 174780697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach // The destination precedes the switch. Try to move the block forward 174880697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach // so we have a positive offset. 174980697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach MachineBasicBlock *NewBB = 175080697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach AdjustJTTargetBlockForward(MBB, MI->getParent()); 175180697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach if (NewBB) 175200a6a1f0225b01229134ecee7a853be638703c36Jim Grosbach MJTI->ReplaceMBBInJumpTable(JTI, JTBBs[j], NewBB); 175380697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach MadeChange = true; 175480697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach } 175580697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach } 175680697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach } 175780697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach 175880697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach return MadeChange; 175980697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach} 176080697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach 17611fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim GrosbachMachineBasicBlock *ARMConstantIslands:: 17621fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim GrosbachAdjustJTTargetBlockForward(MachineBasicBlock *BB, MachineBasicBlock *JTBB) 17631fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach{ 17641fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach MachineFunction &MF = *BB->getParent(); 17651fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach 176680697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach // FIXME: If it's a small block terminated by an unconditional branch, 176780697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach // try to move it; otherwise, create a new block following the jump 176880697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach // table that branches back to the actual target. This is an overly 176980697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach // simplistic heuristic here for proof-of-concept. 177080697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach 177180697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach int BBI = BB->getNumber(); 177280697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach int Size = BBSizes[BBI]; 177380697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach MachineBasicBlock *TBB = 0, *FBB = 0; 177480697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach SmallVector<MachineOperand, 4> Cond; 177580697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach // If the block is small and ends in an unconditional branch, move it. 177680697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach if (Size < 50 && Cond.empty()) { 177700a6a1f0225b01229134ecee7a853be638703c36Jim Grosbach // If the block terminator isn't analyzable, don't try to move the block 177800a6a1f0225b01229134ecee7a853be638703c36Jim Grosbach if (TII->AnalyzeBranch(*BB, TBB, FBB, Cond)) 177900a6a1f0225b01229134ecee7a853be638703c36Jim Grosbach return NULL; 178000a6a1f0225b01229134ecee7a853be638703c36Jim Grosbach 178180697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach MachineFunction::iterator OldPrior = prior(BB); 178280697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach BB->moveAfter(JTBB); 178380697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach OldPrior->updateTerminator(); 178400a6a1f0225b01229134ecee7a853be638703c36Jim Grosbach BB->updateTerminator(); 178580697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach ++NumJTMoved; 178680697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach return NULL; 178780697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach } 17881fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach 17891fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach // Create a new MBB for the code after the jump BB. 17901fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach MachineBasicBlock *NewBB = 17911fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach MF.CreateMachineBasicBlock(JTBB->getBasicBlock()); 17921fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach MachineFunction::iterator MBBI = JTBB; ++MBBI; 17931fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach MF.insert(MBBI, NewBB); 17941fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach 179500a6a1f0225b01229134ecee7a853be638703c36Jim Grosbach //MF.splice(MBBI, NewBB, NewBB); 179600a6a1f0225b01229134ecee7a853be638703c36Jim Grosbach 17971fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach // Add an unconditional branch from NewBB to BB. 17981fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach // There doesn't seem to be meaningful DebugInfo available; this doesn't 17991fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach // correspond directly to anything in the source. 18001fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach assert (isThumb2 && "Adjusting for TB[BH] but not in Thumb2?"); 18011fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach BuildMI(NewBB, DebugLoc::getUnknownLoc(), TII->get(ARM::t2B)).addMBB(BB); 18021fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach 180300a6a1f0225b01229134ecee7a853be638703c36Jim Grosbach // Update internal data structures to account for the newly inserted MBB. 180400a6a1f0225b01229134ecee7a853be638703c36Jim Grosbach MF.RenumberBlocks(NewBB); 180500a6a1f0225b01229134ecee7a853be638703c36Jim Grosbach 18061fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach // Update the CFG. 18071fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach NewBB->addSuccessor(BB); 18081fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach JTBB->removeSuccessor(BB); 18091fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach JTBB->addSuccessor(NewBB); 18101fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach 18111fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach // Insert a size into BBSizes to align it properly with the (newly 18121fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach // renumbered) block numbers. 18131fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach BBSizes.insert(BBSizes.begin()+NewBB->getNumber(), 0); 18141fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach 18151fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach // Likewise for BBOffsets. 18161fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach BBOffsets.insert(BBOffsets.begin()+NewBB->getNumber(), 0); 18171fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach 18181fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach // Figure out how large the first NewMBB is. 18191fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach unsigned NewBBSize = 0; 18201fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach for (MachineBasicBlock::iterator I = NewBB->begin(), E = NewBB->end(); 18211fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach I != E; ++I) 18221fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach NewBBSize += TII->GetInstSizeInBytes(I); 18231fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach 18241fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach unsigned NewBBI = NewBB->getNumber(); 18251fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach unsigned JTBBI = JTBB->getNumber(); 18261fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach // Set the size of NewBB in BBSizes. 18271fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach BBSizes[NewBBI] = NewBBSize; 18281fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach 18291fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach // ...and adjust BBOffsets for NewBB accordingly. 18301fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach BBOffsets[NewBBI] = BBOffsets[JTBBI] + BBSizes[JTBBI]; 18311fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach 18321fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach // All BBOffsets following these blocks must be modified. 18331fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach AdjustBBOffsetsAfter(NewBB, 4); 18341fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach 183580697d1b266cd3cd3b92edd424d66d573db6b4b1Jim Grosbach ++NumJTInserted; 18361fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach return NewBB; 18371fc7d715aa35703fcc4a87ece718a8c447e8ee72Jim Grosbach} 1838