SelectionDAGISel.cpp revision ac22c83e6853c759a10eb7310b019b22e1d42d16
11c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner//===-- SelectionDAGISel.cpp - Implement the SelectionDAGISel class -------===// 2edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman// 31c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner// The LLVM Compiler Infrastructure 41c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner// 51c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner// This file was developed by the LLVM research group and is distributed under 61c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner// the University of Illinois Open Source License. See LICENSE.TXT for details. 7edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman// 81c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner//===----------------------------------------------------------------------===// 91c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner// 101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner// This implements the SelectionDAGISel class. 111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner// 121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner//===----------------------------------------------------------------------===// 131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 141c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#define DEBUG_TYPE "isel" 151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/CodeGen/SelectionDAGISel.h" 16adf6a965a321372c640845407195594835921eb4Chris Lattner#include "llvm/CallingConv.h" 171c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Constants.h" 181c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/DerivedTypes.h" 191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Function.h" 2036ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner#include "llvm/GlobalVariable.h" 211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Instructions.h" 221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Intrinsics.h" 23b1a5a5c4c0182205b91b962def7b008228a1f7e6Chris Lattner#include "llvm/CodeGen/IntrinsicLowering.h" 241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/CodeGen/MachineFunction.h" 251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/CodeGen/MachineFrameInfo.h" 261c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/CodeGen/MachineInstrBuilder.h" 271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/CodeGen/SelectionDAG.h" 281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/CodeGen/SSARegMap.h" 29fa57702388f139e964befecb4b98c7dfe836945fChris Lattner#include "llvm/Target/MRegisterInfo.h" 301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Target/TargetData.h" 311c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Target/TargetFrameInfo.h" 321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Target/TargetInstrInfo.h" 331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Target/TargetLowering.h" 341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Target/TargetMachine.h" 35495a0b51915eb763576874f29192820b731edc22Chris Lattner#include "llvm/Transforms/Utils/BasicBlockUtils.h" 367944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner#include "llvm/Support/CommandLine.h" 377c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner#include "llvm/Support/MathExtras.h" 381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Support/Debug.h" 391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include <map> 401c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include <iostream> 411c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerusing namespace llvm; 421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 43c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattnerstatic cl::opt<bool> 44c88d8e944dae71e31595b8ae264668e68db6b8edChris LattnerGEPISelTest("enable-gep-isel-opt", cl::Hidden, 45c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner cl::desc("temporary for testing")); 46c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 47da8abb02397d7cd62a1e16e7c534edd7096ac873Chris Lattner#ifndef NDEBUG 487944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattnerstatic cl::opt<bool> 497944d9d9957db1efe085d9df3ea89826f50029b7Chris LattnerViewDAGs("view-isel-dags", cl::Hidden, 507944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner cl::desc("Pop up a window to show isel dags as they are selected")); 517944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner#else 52a639a43602cd64087a9730632fbf6f7cf7d88276Chris Lattnerstatic const bool ViewDAGs = 0; 537944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner#endif 547944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner 551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnernamespace llvm { 561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner //===--------------------------------------------------------------------===// 571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// FunctionLoweringInfo - This contains information that is global to a 581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// function that is used when lowering a region of the function. 59f26bc8ef4827cf0023a7052b62b920b41813d473Chris Lattner class FunctionLoweringInfo { 60f26bc8ef4827cf0023a7052b62b920b41813d473Chris Lattner public: 611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TargetLowering &TLI; 621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Function &Fn; 631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineFunction &MF; 641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SSARegMap *RegMap; 651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FunctionLoweringInfo(TargetLowering &TLI, Function &Fn,MachineFunction &MF); 671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// MBBMap - A mapping from LLVM basic blocks to their machine code entry. 691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<const BasicBlock*, MachineBasicBlock *> MBBMap; 701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// ValueMap - Since we emit code for the function a basic block at a time, 721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// we must remember which virtual registers hold the values for 731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// cross-basic-block values. 741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<const Value*, unsigned> ValueMap; 751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 761c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// StaticAllocaMap - Keep track of frame indices for fixed sized allocas in 771c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// the entry block. This allows the allocas to be efficiently referenced 781c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// anywhere in the function. 791c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<const AllocaInst*, int> StaticAllocaMap; 801c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 811c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned MakeReg(MVT::ValueType VT) { 821c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return RegMap->createVirtualRegister(TLI.getRegClassFor(VT)); 831c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 84edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 851c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned CreateRegForValue(const Value *V) { 861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType VT = TLI.getValueType(V->getType()); 871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // The common case is that we will only create one register for this 881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // value. If we have that case, create and return the virtual register. 891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned NV = TLI.getNumElements(VT); 90fb849800ea2040c188365c265421ad54fbdcf219Chris Lattner if (NV == 1) { 91fb849800ea2040c188365c265421ad54fbdcf219Chris Lattner // If we are promoting this value, pick the next largest supported type. 9298e5c0e5e4c5be1b531d287d0a1373a62fe562e2Chris Lattner return MakeReg(TLI.getTypeToTransformTo(VT)); 93fb849800ea2040c188365c265421ad54fbdcf219Chris Lattner } 94edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If this value is represented with multiple target registers, make sure 961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // to create enough consequtive registers of the right (smaller) type. 971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned NT = VT-1; // Find the type to use. 981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner while (TLI.getNumElements((MVT::ValueType)NT) != 1) 991c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner --NT; 100edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 1011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned R = MakeReg((MVT::ValueType)NT); 1021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (unsigned i = 1; i != NV; ++i) 1031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MakeReg((MVT::ValueType)NT); 1041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return R; 1051c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 106edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 1071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned InitializeRegForValue(const Value *V) { 1081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned &R = ValueMap[V]; 1091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(R == 0 && "Already initialized this value register!"); 1101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return R = CreateRegForValue(V); 1111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner }; 1131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 1141c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner/// isUsedOutsideOfDefiningBlock - Return true if this instruction is used by 1161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner/// PHI nodes or outside of the basic block that defines it. 1171c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerstatic bool isUsedOutsideOfDefiningBlock(Instruction *I) { 1181c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (isa<PHINode>(I)) return true; 1191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner BasicBlock *BB = I->getParent(); 1201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (Value::use_iterator UI = I->use_begin(), E = I->use_end(); UI != E; ++UI) 1211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (cast<Instruction>(*UI)->getParent() != BB || isa<PHINode>(*UI)) 1221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return true; 1231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return false; 1241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 1251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 126bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner/// isOnlyUsedInEntryBlock - If the specified argument is only used in the 127bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner/// entry block, return true. 128bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattnerstatic bool isOnlyUsedInEntryBlock(Argument *A) { 129bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner BasicBlock *Entry = A->getParent()->begin(); 130bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner for (Value::use_iterator UI = A->use_begin(), E = A->use_end(); UI != E; ++UI) 131bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner if (cast<Instruction>(*UI)->getParent() != Entry) 132bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner return false; // Use not in entry block. 133bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner return true; 134bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner} 135bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner 1361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris LattnerFunctionLoweringInfo::FunctionLoweringInfo(TargetLowering &tli, 137edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman Function &fn, MachineFunction &mf) 1381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner : TLI(tli), Fn(fn), MF(mf), RegMap(MF.getSSARegMap()) { 1391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 140bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner // Create a vreg for each argument register that is not dead and is used 141bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner // outside of the entry block for the function. 14216ce0df92717cd1474029d87efe596d000dc2caaChris Lattner for (Function::arg_iterator AI = Fn.arg_begin(), E = Fn.arg_end(); 14316ce0df92717cd1474029d87efe596d000dc2caaChris Lattner AI != E; ++AI) 144bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner if (!isOnlyUsedInEntryBlock(AI)) 145bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner InitializeRegForValue(AI); 1461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 147bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner // Initialize the mapping of values to registers. This is only set up for 148bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner // instruction values that are used outside of the block that defines 149bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner // them. 1502aeaf4e839438d51766996006fc22310d05ab2a7Jeff Cohen Function::iterator BB = Fn.begin(), EB = Fn.end(); 1511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) 1521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (AllocaInst *AI = dyn_cast<AllocaInst>(I)) 1531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (ConstantUInt *CUI = dyn_cast<ConstantUInt>(AI->getArraySize())) { 1541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const Type *Ty = AI->getAllocatedType(); 1551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner uint64_t TySize = TLI.getTargetData().getTypeSize(Ty); 156ae232e7a1055033436370c0b3aecf054fa44d5e7Nate Begeman unsigned Align = 157ae232e7a1055033436370c0b3aecf054fa44d5e7Nate Begeman std::max((unsigned)TLI.getTargetData().getTypeAlignment(Ty), 158ae232e7a1055033436370c0b3aecf054fa44d5e7Nate Begeman AI->getAlignment()); 159a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner 160a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner // If the alignment of the value is smaller than the size of the value, 161a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner // and if the size of the value is particularly small (<= 8 bytes), 162a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner // round up to the size of the value for potentially better performance. 163a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner // 164a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner // FIXME: This could be made better with a preferred alignment hook in 165a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner // TargetData. It serves primarily to 8-byte align doubles for X86. 166a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner if (Align < TySize && TySize <= 8) Align = TySize; 1672dfa8192abaad8a3c29132dba50e8b85218e918cChris Lattner TySize *= CUI->getValue(); // Get total allocated size. 168d222f6ab67472fa2b2e211172a11b43905aa9445Chris Lattner if (TySize == 0) TySize = 1; // Don't create zero-sized stack objects. 1691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner StaticAllocaMap[AI] = 170f26bc8ef4827cf0023a7052b62b920b41813d473Chris Lattner MF.getFrameInfo()->CreateStackObject((unsigned)TySize, Align); 1711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1732aeaf4e839438d51766996006fc22310d05ab2a7Jeff Cohen for (; BB != EB; ++BB) 1742aeaf4e839438d51766996006fc22310d05ab2a7Jeff Cohen for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) 1751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (!I->use_empty() && isUsedOutsideOfDefiningBlock(I)) 1761c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (!isa<AllocaInst>(I) || 1771c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner !StaticAllocaMap.count(cast<AllocaInst>(I))) 1781c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner InitializeRegForValue(I); 1791c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1801c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Create an initial MachineBasicBlock for each LLVM BasicBlock in F. This 1811c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // also creates the initial PHI MachineInstrs, though none of the input 1821c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // operands are populated. 1832aeaf4e839438d51766996006fc22310d05ab2a7Jeff Cohen for (BB = Fn.begin(), EB = Fn.end(); BB != EB; ++BB) { 1841c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock *MBB = new MachineBasicBlock(BB); 1851c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MBBMap[BB] = MBB; 1861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MF.getBasicBlockList().push_back(MBB); 1871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Create Machine PHI nodes for LLVM PHI nodes, lowering them as 1891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // appropriate. 1901c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner PHINode *PN; 1911c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (BasicBlock::iterator I = BB->begin(); 192f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner (PN = dyn_cast<PHINode>(I)); ++I) 193f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner if (!PN->use_empty()) { 194f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner unsigned NumElements = 195f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner TLI.getNumElements(TLI.getValueType(PN->getType())); 196f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner unsigned PHIReg = ValueMap[PN]; 197f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner assert(PHIReg &&"PHI node does not have an assigned virtual register!"); 198f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner for (unsigned i = 0; i != NumElements; ++i) 199f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner BuildMI(MBB, TargetInstrInfo::PHI, PN->getNumOperands(), PHIReg+i); 200f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner } 2011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 2021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 2031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2051c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2061c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner//===----------------------------------------------------------------------===// 2071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner/// SelectionDAGLowering - This is the common target-independent lowering 2081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner/// implementation that is parameterized by a TargetLowering object. 2091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner/// Also, targets can overload any lowering method. 2101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner/// 2111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnernamespace llvm { 2121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerclass SelectionDAGLowering { 2131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock *CurMBB; 2141c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<const Value*, SDOperand> NodeMap; 2161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 217d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner /// PendingLoads - Loads are not emitted to the program immediately. We bunch 218d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner /// them up and then emit token factor nodes when possible. This allows us to 219d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner /// get simple disambiguation between loads without worrying about alias 220d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner /// analysis. 221d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner std::vector<SDOperand> PendingLoads; 222d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner 2231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerpublic: 2241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // TLI - This is information that describes the available target features we 2251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // need for lowering. This indicates when operations are unavailable, 2261c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // implemented with a libcall, etc. 2271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TargetLowering &TLI; 2281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SelectionDAG &DAG; 2291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const TargetData &TD; 2301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2311c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// FuncInfo - Information about the function as a whole. 2321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// 2331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FunctionLoweringInfo &FuncInfo; 2341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SelectionDAGLowering(SelectionDAG &dag, TargetLowering &tli, 236edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman FunctionLoweringInfo &funcinfo) 2371c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner : TLI(tli), DAG(dag), TD(DAG.getTarget().getTargetData()), 2381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FuncInfo(funcinfo) { 2391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 2401c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 241a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner /// getRoot - Return the current virtual root of the Selection DAG. 242a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner /// 243a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner SDOperand getRoot() { 244d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner if (PendingLoads.empty()) 245d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner return DAG.getRoot(); 246edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 247d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner if (PendingLoads.size() == 1) { 248d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner SDOperand Root = PendingLoads[0]; 249d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner DAG.setRoot(Root); 250d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner PendingLoads.clear(); 251d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner return Root; 252d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner } 253d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner 254d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner // Otherwise, we have to make a token factor node. 255d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner SDOperand Root = DAG.getNode(ISD::TokenFactor, MVT::Other, PendingLoads); 256d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner PendingLoads.clear(); 257d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner DAG.setRoot(Root); 258d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner return Root; 259a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner } 260a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner 2611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visit(Instruction &I) { visit(I.getOpcode(), I); } 2621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visit(unsigned Opcode, User &I) { 2641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner switch (Opcode) { 2651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner default: assert(0 && "Unknown instruction type encountered!"); 2661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner abort(); 2671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Build the switch statement using the Instruction.def file. 2681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#define HANDLE_INST(NUM, OPCODE, CLASS) \ 2691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case Instruction::OPCODE:return visit##OPCODE((CLASS&)I); 2701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Instruction.def" 2711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 2721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 2731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void setCurrentBasicBlock(MachineBasicBlock *MBB) { CurMBB = MBB; } 2751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2761c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2771c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand getIntPtrConstant(uint64_t Val) { 2781c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return DAG.getConstant(Val, TLI.getPointerTy()); 2791c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 2801c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2811c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand getValue(const Value *V) { 2821c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand &N = NodeMap[V]; 2831c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (N.Val) return N; 2841c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2858cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman const Type *VTy = V->getType(); 2868cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman MVT::ValueType VT = TLI.getValueType(VTy); 2871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V))) 2881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { 2891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner visit(CE->getOpcode(), *CE); 2901c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(N.Val && "visit didn't populate the ValueMap!"); 2911c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return N; 2921c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else if (GlobalValue *GV = dyn_cast<GlobalValue>(C)) { 2931c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return N = DAG.getGlobalAddress(GV, VT); 2941c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else if (isa<ConstantPointerNull>(C)) { 2951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return N = DAG.getConstant(0, TLI.getPointerTy()); 2961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else if (isa<UndefValue>(C)) { 297b882752bd04602249d391699dc7183de007f8964Nate Begeman return N = DAG.getNode(ISD::UNDEF, VT); 2981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) { 2991c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return N = DAG.getConstantFP(CFP->getValue(), VT); 3008cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman } else if (const PackedType *PTy = dyn_cast<PackedType>(VTy)) { 3018cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman unsigned NumElements = PTy->getNumElements(); 3028cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman MVT::ValueType PVT = TLI.getValueType(PTy->getElementType()); 3038cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman MVT::ValueType TVT = MVT::getVectorType(PVT, NumElements); 3048cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman 3058cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman // Now that we know the number and type of the elements, push a 3068cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman // Constant or ConstantFP node onto the ops list for each element of 3078cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman // the packed constant. 3088cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman std::vector<SDOperand> Ops; 3098cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman for (unsigned i = 0; i < NumElements; ++i) { 3108cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman const Constant *CEl = C->getOperand(i); 3118cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman if (MVT::isFloatingPoint(PVT)) 3128cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman Ops.push_back(DAG.getConstantFP(cast<ConstantFP>(CEl)->getValue(), 3138cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman PVT)); 3148cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman else 3158cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman Ops.push_back( 3168cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman DAG.getConstant(cast<ConstantIntegral>(CEl)->getRawValue(), 3178cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman PVT)); 3188cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman } 3198cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman // Handle the case where we have a 1-element vector, in which 3208cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman // case we want to immediately turn it into a scalar constant. 321cc827e60b67b2cbcf08a37b119e68081e4171b8aNate Begeman if (Ops.size() == 1) { 3228cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman return N = Ops[0]; 323cc827e60b67b2cbcf08a37b119e68081e4171b8aNate Begeman } else if (TVT != MVT::Other && TLI.isTypeLegal(TVT)) { 324cc827e60b67b2cbcf08a37b119e68081e4171b8aNate Begeman return N = DAG.getNode(ISD::ConstantVec, TVT, Ops); 325cc827e60b67b2cbcf08a37b119e68081e4171b8aNate Begeman } else { 326cc827e60b67b2cbcf08a37b119e68081e4171b8aNate Begeman // If the packed type isn't legal, then create a ConstantVec node with 327cc827e60b67b2cbcf08a37b119e68081e4171b8aNate Begeman // generic Vector type instead. 328cc827e60b67b2cbcf08a37b119e68081e4171b8aNate Begeman return N = DAG.getNode(ISD::ConstantVec, MVT::Vector, Ops); 329cc827e60b67b2cbcf08a37b119e68081e4171b8aNate Begeman } 3301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else { 3311c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Canonicalize all constant ints to be unsigned. 3321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return N = DAG.getConstant(cast<ConstantIntegral>(C)->getRawValue(),VT); 3331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (const AllocaInst *AI = dyn_cast<AllocaInst>(V)) { 3361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<const AllocaInst*, int>::iterator SI = 3371c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FuncInfo.StaticAllocaMap.find(AI); 3381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (SI != FuncInfo.StaticAllocaMap.end()) 3391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return DAG.getFrameIndex(SI->second, TLI.getPointerTy()); 3401c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3411c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<const Value*, unsigned>::const_iterator VMI = 3431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FuncInfo.ValueMap.find(V); 3441c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(VMI != FuncInfo.ValueMap.end() && "Value not in map!"); 345c8ea3c47103656a0924909f41651bf5d396c26cdChris Lattner 346d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner unsigned InReg = VMI->second; 347d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner 348d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // If this type is not legal, make it so now. 349d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner MVT::ValueType DestVT = TLI.getTypeToTransformTo(VT); 350d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner 351d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner N = DAG.getCopyFromReg(DAG.getEntryNode(), InReg, DestVT); 352d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner if (DestVT < VT) { 353d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // Source must be expanded. This input value is actually coming from the 354d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // register pair VMI->second and VMI->second+1. 355d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner N = DAG.getNode(ISD::BUILD_PAIR, VT, N, 356d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner DAG.getCopyFromReg(DAG.getEntryNode(), InReg+1, DestVT)); 357d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner } else { 358d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner if (DestVT > VT) { // Promotion case 359d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner if (MVT::isFloatingPoint(VT)) 360d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner N = DAG.getNode(ISD::FP_ROUND, VT, N); 361d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner else 362d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner N = DAG.getNode(ISD::TRUNCATE, VT, N); 363d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner } 364d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner } 365d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner 366d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner return N; 3671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const SDOperand &setValue(const Value *V, SDOperand NewN) { 3701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand &N = NodeMap[V]; 3711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(N.Val == 0 && "Already set a value for this node!"); 3721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return N = NewN; 3731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Terminator instructions. 3761c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitRet(ReturnInst &I); 3771c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitBr(BranchInst &I); 3781c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitUnreachable(UnreachableInst &I) { /* noop */ } 3791c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3801c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // These all get lowered before this pass. 3811c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSwitch(SwitchInst &I) { assert(0 && "TODO"); } 3821c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitInvoke(InvokeInst &I) { assert(0 && "TODO"); } 3831c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitUnwind(UnwindInst &I) { assert(0 && "TODO"); } 3841c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3851c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // 3865fbb5d2459a5410590f285250faa604576308a93Nate Begeman void visitBinary(User &I, unsigned IntOp, unsigned FPOp, unsigned VecOp); 387e21ea61588996609f827213a2701a204f2f13fb3Nate Begeman void visitShift(User &I, unsigned Opcode); 3885fbb5d2459a5410590f285250faa604576308a93Nate Begeman void visitAdd(User &I) { 3895fbb5d2459a5410590f285250faa604576308a93Nate Begeman visitBinary(I, ISD::ADD, ISD::FADD, ISD::VADD); 39001b3d73c20f5afb8265ae943a8ba23c2238c5eeaChris Lattner } 391b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner void visitSub(User &I); 3925fbb5d2459a5410590f285250faa604576308a93Nate Begeman void visitMul(User &I) { 3935fbb5d2459a5410590f285250faa604576308a93Nate Begeman visitBinary(I, ISD::MUL, ISD::FMUL, ISD::VMUL); 39401b3d73c20f5afb8265ae943a8ba23c2238c5eeaChris Lattner } 3951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitDiv(User &I) { 39601b3d73c20f5afb8265ae943a8ba23c2238c5eeaChris Lattner const Type *Ty = I.getType(); 3975fbb5d2459a5410590f285250faa604576308a93Nate Begeman visitBinary(I, Ty->isSigned() ? ISD::SDIV : ISD::UDIV, ISD::FDIV, 0); 3981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3991c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitRem(User &I) { 40001b3d73c20f5afb8265ae943a8ba23c2238c5eeaChris Lattner const Type *Ty = I.getType(); 4015fbb5d2459a5410590f285250faa604576308a93Nate Begeman visitBinary(I, Ty->isSigned() ? ISD::SREM : ISD::UREM, ISD::FREM, 0); 4021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 4035fbb5d2459a5410590f285250faa604576308a93Nate Begeman void visitAnd(User &I) { visitBinary(I, ISD::AND, 0, 0); } 4045fbb5d2459a5410590f285250faa604576308a93Nate Begeman void visitOr (User &I) { visitBinary(I, ISD::OR, 0, 0); } 4055fbb5d2459a5410590f285250faa604576308a93Nate Begeman void visitXor(User &I) { visitBinary(I, ISD::XOR, 0, 0); } 406e21ea61588996609f827213a2701a204f2f13fb3Nate Begeman void visitShl(User &I) { visitShift(I, ISD::SHL); } 407e21ea61588996609f827213a2701a204f2f13fb3Nate Begeman void visitShr(User &I) { 408e21ea61588996609f827213a2701a204f2f13fb3Nate Begeman visitShift(I, I.getType()->isUnsigned() ? ISD::SRL : ISD::SRA); 4091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 4101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetCC(User &I, ISD::CondCode SignedOpc, ISD::CondCode UnsignedOpc); 4121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetEQ(User &I) { visitSetCC(I, ISD::SETEQ, ISD::SETEQ); } 4131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetNE(User &I) { visitSetCC(I, ISD::SETNE, ISD::SETNE); } 4141c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetLE(User &I) { visitSetCC(I, ISD::SETLE, ISD::SETULE); } 4151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetGE(User &I) { visitSetCC(I, ISD::SETGE, ISD::SETUGE); } 4161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetLT(User &I) { visitSetCC(I, ISD::SETLT, ISD::SETULT); } 4171c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetGT(User &I) { visitSetCC(I, ISD::SETGT, ISD::SETUGT); } 4181c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitGetElementPtr(User &I); 4201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitCast(User &I); 4211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSelect(User &I); 4221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // 4231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitMalloc(MallocInst &I); 4251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitFree(FreeInst &I); 4261c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitAlloca(AllocaInst &I); 4271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitLoad(LoadInst &I); 4281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitStore(StoreInst &I); 4291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitPHI(PHINode &I) { } // PHI nodes are handled specially. 4301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitCall(CallInst &I); 431c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner const char *visitIntrinsicCall(CallInst &I, unsigned Intrinsic); 4321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitVAStart(CallInst &I); 4341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitVAArg(VAArgInst &I); 4351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitVAEnd(CallInst &I); 4361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitVACopy(CallInst &I); 43739ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner void visitFrameReturnAddress(CallInst &I, bool isFrameAddress); 4381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4397041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner void visitMemIntrinsic(CallInst &I, unsigned Op); 4401c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4411c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitUserOp1(Instruction &I) { 4421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(0 && "UserOp1 should not exist at instruction selection time!"); 4431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner abort(); 4441c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 4451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitUserOp2(Instruction &I) { 4461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(0 && "UserOp2 should not exist at instruction selection time!"); 4471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner abort(); 4481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 4491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner}; 4501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} // end namespace llvm 4511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitRet(ReturnInst &I) { 4531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (I.getNumOperands() == 0) { 454a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(DAG.getNode(ISD::RET, MVT::Other, getRoot())); 4551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return; 4561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 4571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Op1 = getValue(I.getOperand(0)); 459f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner MVT::ValueType TmpVT; 460f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner 4611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner switch (Op1.getValueType()) { 4621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner default: assert(0 && "Unknown value type!"); 4631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::i1: 4641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::i8: 4651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::i16: 466f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner case MVT::i32: 467f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner // If this is a machine where 32-bits is legal or expanded, promote to 468f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner // 32-bits, otherwise, promote to 64-bits. 469f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner if (TLI.getTypeAction(MVT::i32) == TargetLowering::Promote) 470f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner TmpVT = TLI.getTypeToTransformTo(MVT::i32); 471f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner else 472f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner TmpVT = MVT::i32; 473f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner 474f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner // Extend integer types to result type. 4751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (I.getOperand(0)->getType()->isSigned()) 476f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner Op1 = DAG.getNode(ISD::SIGN_EXTEND, TmpVT, Op1); 4771c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner else 478f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner Op1 = DAG.getNode(ISD::ZERO_EXTEND, TmpVT, Op1); 4791c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner break; 4801c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::f32: 4811c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::i64: 4821c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::f64: 4831c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner break; // No extension needed! 4841c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 4854a95945fa5aa431110f50092f4a45d24772a553bNate Begeman // Allow targets to lower this further to meet ABI requirements 4864a95945fa5aa431110f50092f4a45d24772a553bNate Begeman DAG.setRoot(TLI.LowerReturnTo(getRoot(), Op1, DAG)); 4871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 4881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitBr(BranchInst &I) { 4901c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Update machine-CFG edges. 4911c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock *Succ0MBB = FuncInfo.MBBMap[I.getSuccessor(0)]; 4921c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4931c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Figure out which block is immediately after the current one. 4941c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock *NextBlock = 0; 4951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineFunction::iterator BBI = CurMBB; 4961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (++BBI != CurMBB->getParent()->end()) 4971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner NextBlock = BBI; 4981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4991c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (I.isUnconditional()) { 5001c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If this is not a fall-through branch, emit the branch. 5011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Succ0MBB != NextBlock) 502a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(DAG.getNode(ISD::BR, MVT::Other, getRoot(), 503dedf2bd5a34dac25e4245f58bb902ced6b64edd9Misha Brukman DAG.getBasicBlock(Succ0MBB))); 5041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else { 5051c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock *Succ1MBB = FuncInfo.MBBMap[I.getSuccessor(1)]; 5061c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 5071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Cond = getValue(I.getCondition()); 5081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Succ1MBB == NextBlock) { 5091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If the condition is false, fall through. This means we should branch 5101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // if the condition is true to Succ #0. 511a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(DAG.getNode(ISD::BRCOND, MVT::Other, getRoot(), 512dedf2bd5a34dac25e4245f58bb902ced6b64edd9Misha Brukman Cond, DAG.getBasicBlock(Succ0MBB))); 5131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else if (Succ0MBB == NextBlock) { 5141c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If the condition is true, fall through. This means we should branch if 5151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // the condition is false to Succ #1. Invert the condition first. 5161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand True = DAG.getConstant(1, Cond.getValueType()); 5171c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Cond = DAG.getNode(ISD::XOR, Cond.getValueType(), Cond, True); 518a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(DAG.getNode(ISD::BRCOND, MVT::Other, getRoot(), 519dedf2bd5a34dac25e4245f58bb902ced6b64edd9Misha Brukman Cond, DAG.getBasicBlock(Succ1MBB))); 5201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else { 521e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner std::vector<SDOperand> Ops; 522e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner Ops.push_back(getRoot()); 523e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner Ops.push_back(Cond); 524e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner Ops.push_back(DAG.getBasicBlock(Succ0MBB)); 525e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner Ops.push_back(DAG.getBasicBlock(Succ1MBB)); 526e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner DAG.setRoot(DAG.getNode(ISD::BRCONDTWOWAY, MVT::Other, Ops)); 5271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 5281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 5291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 5301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 531b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattnervoid SelectionDAGLowering::visitSub(User &I) { 532b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner // -0.0 - X --> fneg 53301b3d73c20f5afb8265ae943a8ba23c2238c5eeaChris Lattner if (I.getType()->isFloatingPoint()) { 53401b3d73c20f5afb8265ae943a8ba23c2238c5eeaChris Lattner if (ConstantFP *CFP = dyn_cast<ConstantFP>(I.getOperand(0))) 53501b3d73c20f5afb8265ae943a8ba23c2238c5eeaChris Lattner if (CFP->isExactlyValue(-0.0)) { 53601b3d73c20f5afb8265ae943a8ba23c2238c5eeaChris Lattner SDOperand Op2 = getValue(I.getOperand(1)); 53701b3d73c20f5afb8265ae943a8ba23c2238c5eeaChris Lattner setValue(&I, DAG.getNode(ISD::FNEG, Op2.getValueType(), Op2)); 53801b3d73c20f5afb8265ae943a8ba23c2238c5eeaChris Lattner return; 53901b3d73c20f5afb8265ae943a8ba23c2238c5eeaChris Lattner } 54001b3d73c20f5afb8265ae943a8ba23c2238c5eeaChris Lattner } 5415fbb5d2459a5410590f285250faa604576308a93Nate Begeman visitBinary(I, ISD::SUB, ISD::FSUB, ISD::VSUB); 542b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner} 543b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner 5445fbb5d2459a5410590f285250faa604576308a93Nate Begemanvoid SelectionDAGLowering::visitBinary(User &I, unsigned IntOp, unsigned FPOp, 5455fbb5d2459a5410590f285250faa604576308a93Nate Begeman unsigned VecOp) { 5465fbb5d2459a5410590f285250faa604576308a93Nate Begeman const Type *Ty = I.getType(); 5471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Op1 = getValue(I.getOperand(0)); 5481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Op2 = getValue(I.getOperand(1)); 5492c49f2795514a7c56b680ba0310d7eb0a8a43289Chris Lattner 550b67eb9131c5c04d2e55c6b587fde954619feceafChris Lattner if (Ty->isIntegral()) { 5515fbb5d2459a5410590f285250faa604576308a93Nate Begeman setValue(&I, DAG.getNode(IntOp, Op1.getValueType(), Op1, Op2)); 5525fbb5d2459a5410590f285250faa604576308a93Nate Begeman } else if (Ty->isFloatingPoint()) { 5535fbb5d2459a5410590f285250faa604576308a93Nate Begeman setValue(&I, DAG.getNode(FPOp, Op1.getValueType(), Op1, Op2)); 5545fbb5d2459a5410590f285250faa604576308a93Nate Begeman } else { 5555fbb5d2459a5410590f285250faa604576308a93Nate Begeman const PackedType *PTy = cast<PackedType>(Ty); 5564ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman unsigned NumElements = PTy->getNumElements(); 5574ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman MVT::ValueType PVT = TLI.getValueType(PTy->getElementType()); 558f43a3ca26d7bf431be5cdfb5963350a158e840afNate Begeman MVT::ValueType TVT = MVT::getVectorType(PVT, NumElements); 5594ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman 5604ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman // Immediately scalarize packed types containing only one element, so that 561f43a3ca26d7bf431be5cdfb5963350a158e840afNate Begeman // the Legalize pass does not have to deal with them. Similarly, if the 562f43a3ca26d7bf431be5cdfb5963350a158e840afNate Begeman // abstract vector is going to turn into one that the target natively 563f43a3ca26d7bf431be5cdfb5963350a158e840afNate Begeman // supports, generate that type now so that Legalize doesn't have to deal 564f43a3ca26d7bf431be5cdfb5963350a158e840afNate Begeman // with that either. These steps ensure that Legalize only has to handle 565f43a3ca26d7bf431be5cdfb5963350a158e840afNate Begeman // vector types in its Expand case. 566f43a3ca26d7bf431be5cdfb5963350a158e840afNate Begeman unsigned Opc = MVT::isFloatingPoint(PVT) ? FPOp : IntOp; 5674ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman if (NumElements == 1) { 5684ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman setValue(&I, DAG.getNode(Opc, PVT, Op1, Op2)); 569f43a3ca26d7bf431be5cdfb5963350a158e840afNate Begeman } else if (TVT != MVT::Other && TLI.isTypeLegal(TVT)) { 570f43a3ca26d7bf431be5cdfb5963350a158e840afNate Begeman setValue(&I, DAG.getNode(Opc, TVT, Op1, Op2)); 5714ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman } else { 5724ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman SDOperand Num = DAG.getConstant(NumElements, MVT::i32); 5734ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman SDOperand Typ = DAG.getValueType(PVT); 574ab48be377298bd509427a29e174cf4e305138819Nate Begeman setValue(&I, DAG.getNode(VecOp, MVT::Vector, Op1, Op2, Num, Typ)); 5754ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman } 5765fbb5d2459a5410590f285250faa604576308a93Nate Begeman } 577e21ea61588996609f827213a2701a204f2f13fb3Nate Begeman} 5782c49f2795514a7c56b680ba0310d7eb0a8a43289Chris Lattner 579e21ea61588996609f827213a2701a204f2f13fb3Nate Begemanvoid SelectionDAGLowering::visitShift(User &I, unsigned Opcode) { 580e21ea61588996609f827213a2701a204f2f13fb3Nate Begeman SDOperand Op1 = getValue(I.getOperand(0)); 581e21ea61588996609f827213a2701a204f2f13fb3Nate Begeman SDOperand Op2 = getValue(I.getOperand(1)); 582e21ea61588996609f827213a2701a204f2f13fb3Nate Begeman 583e21ea61588996609f827213a2701a204f2f13fb3Nate Begeman Op2 = DAG.getNode(ISD::ANY_EXTEND, TLI.getShiftAmountTy(), Op2); 584e21ea61588996609f827213a2701a204f2f13fb3Nate Begeman 5851c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner setValue(&I, DAG.getNode(Opcode, Op1.getValueType(), Op1, Op2)); 5861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 5871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 5881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitSetCC(User &I,ISD::CondCode SignedOpcode, 5891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner ISD::CondCode UnsignedOpcode) { 5901c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Op1 = getValue(I.getOperand(0)); 5911c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Op2 = getValue(I.getOperand(1)); 5921c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner ISD::CondCode Opcode = SignedOpcode; 5931c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (I.getOperand(0)->getType()->isUnsigned()) 5941c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Opcode = UnsignedOpcode; 5957cf7e3f33f25544d08492d47cc8a1cbba25dc8d7Chris Lattner setValue(&I, DAG.getSetCC(MVT::i1, Op1, Op2, Opcode)); 5961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 5971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 5981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitSelect(User &I) { 5991c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Cond = getValue(I.getOperand(0)); 6001c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand TrueVal = getValue(I.getOperand(1)); 6011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand FalseVal = getValue(I.getOperand(2)); 6021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner setValue(&I, DAG.getNode(ISD::SELECT, TrueVal.getValueType(), Cond, 6031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TrueVal, FalseVal)); 6041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 6051c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6061c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitCast(User &I) { 6071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand N = getValue(I.getOperand(0)); 6081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType SrcTy = TLI.getValueType(I.getOperand(0)->getType()); 6091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType DestTy = TLI.getValueType(I.getType()); 6101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (N.getValueType() == DestTy) { 6121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner setValue(&I, N); // noop cast. 613ef311aa7cf26ae0cbb6e784d767801b9058dd24bChris Lattner } else if (DestTy == MVT::i1) { 614ef311aa7cf26ae0cbb6e784d767801b9058dd24bChris Lattner // Cast to bool is a comparison against zero, not truncation to zero. 615ef311aa7cf26ae0cbb6e784d767801b9058dd24bChris Lattner SDOperand Zero = isInteger(SrcTy) ? DAG.getConstant(0, N.getValueType()) : 616ef311aa7cf26ae0cbb6e784d767801b9058dd24bChris Lattner DAG.getConstantFP(0.0, N.getValueType()); 6177cf7e3f33f25544d08492d47cc8a1cbba25dc8d7Chris Lattner setValue(&I, DAG.getSetCC(MVT::i1, N, Zero, ISD::SETNE)); 618ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner } else if (isInteger(SrcTy)) { 619ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (isInteger(DestTy)) { // Int -> Int cast 620ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (DestTy < SrcTy) // Truncating cast? 621ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::TRUNCATE, DestTy, N)); 622ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner else if (I.getOperand(0)->getType()->isSigned()) 623ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::SIGN_EXTEND, DestTy, N)); 624ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner else 625ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::ZERO_EXTEND, DestTy, N)); 626ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner } else { // Int -> FP cast 627ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (I.getOperand(0)->getType()->isSigned()) 628ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::SINT_TO_FP, DestTy, N)); 629ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner else 630ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::UINT_TO_FP, DestTy, N)); 631ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner } 6321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else { 633ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner assert(isFloatingPoint(SrcTy) && "Unknown value type!"); 634ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (isFloatingPoint(DestTy)) { // FP -> FP cast 635ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (DestTy < SrcTy) // Rounding cast? 636ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::FP_ROUND, DestTy, N)); 637ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner else 638ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::FP_EXTEND, DestTy, N)); 639ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner } else { // FP -> Int cast. 640ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (I.getType()->isSigned()) 641ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::FP_TO_SINT, DestTy, N)); 642ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner else 643ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::FP_TO_UINT, DestTy, N)); 644ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner } 6451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 6461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 6471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitGetElementPtr(User &I) { 6491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand N = getValue(I.getOperand(0)); 6501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const Type *Ty = I.getOperand(0)->getType(); 6511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const Type *UIntPtrTy = TD.getIntPtrType(); 6521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (GetElementPtrInst::op_iterator OI = I.op_begin()+1, E = I.op_end(); 6541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner OI != E; ++OI) { 6551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Value *Idx = *OI; 656c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner if (const StructType *StTy = dyn_cast<StructType>(Ty)) { 6571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned Field = cast<ConstantUInt>(Idx)->getValue(); 6581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Field) { 6591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // N = N + Offset 6601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner uint64_t Offset = TD.getStructLayout(StTy)->MemberOffsets[Field]; 6611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner N = DAG.getNode(ISD::ADD, N.getValueType(), N, 662dedf2bd5a34dac25e4245f58bb902ced6b64edd9Misha Brukman getIntPtrConstant(Offset)); 6631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 6641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Ty = StTy->getElementType(Field); 6651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else { 6661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Ty = cast<SequentialType>(Ty)->getElementType(); 6677c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner 6687c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner // If this is a constant subscript, handle it quickly. 6697c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner if (ConstantInt *CI = dyn_cast<ConstantInt>(Idx)) { 6707c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner if (CI->getRawValue() == 0) continue; 6717c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner 6727c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner uint64_t Offs; 6737c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner if (ConstantSInt *CSI = dyn_cast<ConstantSInt>(CI)) 6747c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner Offs = (int64_t)TD.getTypeSize(Ty)*CSI->getValue(); 6757c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner else 6767c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner Offs = TD.getTypeSize(Ty)*cast<ConstantUInt>(CI)->getValue(); 6777c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner N = DAG.getNode(ISD::ADD, N.getValueType(), N, getIntPtrConstant(Offs)); 6787c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner continue; 6797c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner } 6807c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner 6817c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner // N = N + Idx * ElementSize; 6827c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner uint64_t ElementSize = TD.getTypeSize(Ty); 6837c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner SDOperand IdxN = getValue(Idx); 6847c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner 6857c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner // If the index is smaller or larger than intptr_t, truncate or extend 6867c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner // it. 6877c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner if (IdxN.getValueType() < N.getValueType()) { 6887c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner if (Idx->getType()->isSigned()) 6897c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner IdxN = DAG.getNode(ISD::SIGN_EXTEND, N.getValueType(), IdxN); 6907c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner else 6917c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner IdxN = DAG.getNode(ISD::ZERO_EXTEND, N.getValueType(), IdxN); 6927c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner } else if (IdxN.getValueType() > N.getValueType()) 6937c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner IdxN = DAG.getNode(ISD::TRUNCATE, N.getValueType(), IdxN); 6947c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner 6957c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner // If this is a multiply by a power of two, turn it into a shl 6967c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner // immediately. This is a very common case. 6977c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner if (isPowerOf2_64(ElementSize)) { 6987c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner unsigned Amt = Log2_64(ElementSize); 6997c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner IdxN = DAG.getNode(ISD::SHL, N.getValueType(), IdxN, 7006b2d69655ace2788b244c8a4ebcfb6f2a926ad92Chris Lattner DAG.getConstant(Amt, TLI.getShiftAmountTy())); 7011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner N = DAG.getNode(ISD::ADD, N.getValueType(), N, IdxN); 7027c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner continue; 7031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 7047c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner 7057c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner SDOperand Scale = getIntPtrConstant(ElementSize); 7067c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner IdxN = DAG.getNode(ISD::MUL, N.getValueType(), IdxN, Scale); 7077c0104b525a4ba8b5268ee5455f92b011f7cc263Chris Lattner N = DAG.getNode(ISD::ADD, N.getValueType(), N, IdxN); 7081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 7091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 7101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner setValue(&I, N); 7111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 7121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 7131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitAlloca(AllocaInst &I) { 7141c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If this is a fixed sized alloca in the entry block of the function, 7151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // allocate it statically on the stack. 7161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (FuncInfo.StaticAllocaMap.count(&I)) 7171c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return; // getValue will auto-populate this. 7181c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 7191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const Type *Ty = I.getAllocatedType(); 7201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner uint64_t TySize = TLI.getTargetData().getTypeSize(Ty); 721ae232e7a1055033436370c0b3aecf054fa44d5e7Nate Begeman unsigned Align = std::max((unsigned)TLI.getTargetData().getTypeAlignment(Ty), 722ae232e7a1055033436370c0b3aecf054fa44d5e7Nate Begeman I.getAlignment()); 7231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 7241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand AllocSize = getValue(I.getArraySize()); 72568cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner MVT::ValueType IntPtr = TLI.getPointerTy(); 72668cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner if (IntPtr < AllocSize.getValueType()) 72768cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner AllocSize = DAG.getNode(ISD::TRUNCATE, IntPtr, AllocSize); 72868cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner else if (IntPtr > AllocSize.getValueType()) 72968cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner AllocSize = DAG.getNode(ISD::ZERO_EXTEND, IntPtr, AllocSize); 7301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 73168cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner AllocSize = DAG.getNode(ISD::MUL, IntPtr, AllocSize, 7321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner getIntPtrConstant(TySize)); 7331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 7341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Handle alignment. If the requested alignment is less than or equal to the 7351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // stack alignment, ignore it and round the size of the allocation up to the 7361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // stack alignment size. If the size is greater than the stack alignment, we 7371c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // note this in the DYNAMIC_STACKALLOC node. 7381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned StackAlign = 7391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TLI.getTargetMachine().getFrameInfo()->getStackAlignment(); 7401c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Align <= StackAlign) { 7411c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Align = 0; 7421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Add SA-1 to the size. 7431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner AllocSize = DAG.getNode(ISD::ADD, AllocSize.getValueType(), AllocSize, 7441c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner getIntPtrConstant(StackAlign-1)); 7451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Mask out the low bits for alignment purposes. 7461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner AllocSize = DAG.getNode(ISD::AND, AllocSize.getValueType(), AllocSize, 7471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner getIntPtrConstant(~(uint64_t)(StackAlign-1))); 7481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 7491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 750adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner std::vector<MVT::ValueType> VTs; 751adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner VTs.push_back(AllocSize.getValueType()); 752adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner VTs.push_back(MVT::Other); 753adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner std::vector<SDOperand> Ops; 754adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner Ops.push_back(getRoot()); 755adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner Ops.push_back(AllocSize); 756adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner Ops.push_back(getIntPtrConstant(Align)); 757adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner SDOperand DSA = DAG.getNode(ISD::DYNAMIC_STACKALLOC, VTs, Ops); 7581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DAG.setRoot(setValue(&I, DSA).getValue(1)); 7591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 7601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Inform the Frame Information that we have just allocated a variable-sized 7611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // object. 7621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner CurMBB->getParent()->getFrameInfo()->CreateVariableSizedObject(); 7631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 7641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 76536ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner/// getStringValue - Turn an LLVM constant pointer that eventually points to a 76636ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner/// global into a string value. Return an empty string if we can't do it. 76736ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner/// 76836ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattnerstatic std::string getStringValue(Value *V, unsigned Offset = 0) { 76936ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner if (GlobalVariable *GV = dyn_cast<GlobalVariable>(V)) { 77036ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner if (GV->hasInitializer() && isa<ConstantArray>(GV->getInitializer())) { 77136ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner ConstantArray *Init = cast<ConstantArray>(GV->getInitializer()); 77236ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner if (Init->isString()) { 77336ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner std::string Result = Init->getAsString(); 77436ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner if (Offset < Result.size()) { 77536ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner // If we are pointing INTO The string, erase the beginning... 77636ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner Result.erase(Result.begin(), Result.begin()+Offset); 77736ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner 77836ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner // Take off the null terminator, and any string fragments after it. 77936ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner std::string::size_type NullPos = Result.find_first_of((char)0); 78036ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner if (NullPos != std::string::npos) 78136ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner Result.erase(Result.begin()+NullPos, Result.end()); 78236ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner return Result; 78336ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner } 78436ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner } 78536ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner } 78636ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner } else if (Constant *C = dyn_cast<Constant>(V)) { 78736ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner if (GlobalValue *GV = dyn_cast<GlobalValue>(C)) 78836ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner return getStringValue(GV, Offset); 78936ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { 79036ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner if (CE->getOpcode() == Instruction::GetElementPtr) { 79136ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner // Turn a gep into the specified offset. 79236ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner if (CE->getNumOperands() == 3 && 79336ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner cast<Constant>(CE->getOperand(1))->isNullValue() && 79436ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner isa<ConstantInt>(CE->getOperand(2))) { 79536ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner return getStringValue(CE->getOperand(0), 79636ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner Offset+cast<ConstantInt>(CE->getOperand(2))->getRawValue()); 79736ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner } 79836ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner } 79936ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner } 80036ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner } 80136ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner return ""; 80236ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner} 8031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 8041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitLoad(LoadInst &I) { 8051c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Ptr = getValue(I.getOperand(0)); 806edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 807d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner SDOperand Root; 808d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner if (I.isVolatile()) 809d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner Root = getRoot(); 810d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner else { 811d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner // Do not serialize non-volatile loads against each other. 812d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner Root = DAG.getRoot(); 813d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner } 8145fbb5d2459a5410590f285250faa604576308a93Nate Begeman 8155fbb5d2459a5410590f285250faa604576308a93Nate Begeman const Type *Ty = I.getType(); 8165fbb5d2459a5410590f285250faa604576308a93Nate Begeman SDOperand L; 8175fbb5d2459a5410590f285250faa604576308a93Nate Begeman 8188cfa57b1b4eade4e0101195b2f94ab288cd03563Nate Begeman if (const PackedType *PTy = dyn_cast<PackedType>(Ty)) { 8194ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman unsigned NumElements = PTy->getNumElements(); 8204ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman MVT::ValueType PVT = TLI.getValueType(PTy->getElementType()); 821f43a3ca26d7bf431be5cdfb5963350a158e840afNate Begeman MVT::ValueType TVT = MVT::getVectorType(PVT, NumElements); 8224ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman 8234ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman // Immediately scalarize packed types containing only one element, so that 8244ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman // the Legalize pass does not have to deal with them. 8254ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman if (NumElements == 1) { 8264ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman L = DAG.getLoad(PVT, Root, Ptr, DAG.getSrcValue(I.getOperand(0))); 827f43a3ca26d7bf431be5cdfb5963350a158e840afNate Begeman } else if (TVT != MVT::Other && TLI.isTypeLegal(TVT)) { 828f43a3ca26d7bf431be5cdfb5963350a158e840afNate Begeman L = DAG.getLoad(TVT, Root, Ptr, DAG.getSrcValue(I.getOperand(0))); 8294ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman } else { 8304ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman L = DAG.getVecLoad(NumElements, PVT, Root, Ptr, 8314ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman DAG.getSrcValue(I.getOperand(0))); 8324ef3b817fee7ea5be7219e00ab8e15976bfe279fNate Begeman } 8335fbb5d2459a5410590f285250faa604576308a93Nate Begeman } else { 8345fbb5d2459a5410590f285250faa604576308a93Nate Begeman L = DAG.getLoad(TLI.getValueType(Ty), Root, Ptr, 8355fbb5d2459a5410590f285250faa604576308a93Nate Begeman DAG.getSrcValue(I.getOperand(0))); 8365fbb5d2459a5410590f285250faa604576308a93Nate Begeman } 837d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner setValue(&I, L); 838d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner 839d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner if (I.isVolatile()) 840d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner DAG.setRoot(L.getValue(1)); 841d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner else 842d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner PendingLoads.push_back(L.getValue(1)); 8431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 8441c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 8451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 8461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitStore(StoreInst &I) { 8471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Value *SrcV = I.getOperand(0); 8481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Src = getValue(SrcV); 8491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Ptr = getValue(I.getOperand(1)); 850369e6db9b6033bb60519b0ad84afeacc9ec9b416Chris Lattner DAG.setRoot(DAG.getNode(ISD::STORE, MVT::Other, getRoot(), Src, Ptr, 85106ef88472f7bac3512e224974e87a0a456471b82Andrew Lenharth DAG.getSrcValue(I.getOperand(1)))); 8521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 8531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 854c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner/// visitIntrinsicCall - Lower the call to the specified intrinsic function. If 855c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner/// we want to emit this as a call to a named external function, return the name 856c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner/// otherwise lower it and return null. 857c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattnerconst char * 858c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris LattnerSelectionDAGLowering::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) { 859c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner switch (Intrinsic) { 860c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::vastart: visitVAStart(I); return 0; 861c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::vaend: visitVAEnd(I); return 0; 862c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::vacopy: visitVACopy(I); return 0; 863c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::returnaddress: visitFrameReturnAddress(I, false); return 0; 864c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::frameaddress: visitFrameReturnAddress(I, true); return 0; 865c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::setjmp: 866c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner return "_setjmp"+!TLI.usesUnderscoreSetJmpLongJmp(); 867c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner break; 868c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::longjmp: 869c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner return "_longjmp"+!TLI.usesUnderscoreSetJmpLongJmp(); 870c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner break; 871c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::memcpy: visitMemIntrinsic(I, ISD::MEMCPY); return 0; 872c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::memset: visitMemIntrinsic(I, ISD::MEMSET); return 0; 873c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::memmove: visitMemIntrinsic(I, ISD::MEMMOVE); return 0; 874c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner 875c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::readport: 876c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::readio: { 877c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner std::vector<MVT::ValueType> VTs; 878c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner VTs.push_back(TLI.getValueType(I.getType())); 879c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner VTs.push_back(MVT::Other); 880c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner std::vector<SDOperand> Ops; 881c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner Ops.push_back(getRoot()); 882c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner Ops.push_back(getValue(I.getOperand(1))); 883c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner SDOperand Tmp = DAG.getNode(Intrinsic == Intrinsic::readport ? 884c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner ISD::READPORT : ISD::READIO, VTs, Ops); 885c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner 886c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner setValue(&I, Tmp); 887c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner DAG.setRoot(Tmp.getValue(1)); 888c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner return 0; 889c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner } 890c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::writeport: 891c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::writeio: 892c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner DAG.setRoot(DAG.getNode(Intrinsic == Intrinsic::writeport ? 893c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner ISD::WRITEPORT : ISD::WRITEIO, MVT::Other, 894c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner getRoot(), getValue(I.getOperand(1)), 895c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner getValue(I.getOperand(2)))); 896c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner return 0; 897b1a5a5c4c0182205b91b962def7b008228a1f7e6Chris Lattner 898c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::dbg_stoppoint: 89936ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner { 900b1a5a5c4c0182205b91b962def7b008228a1f7e6Chris Lattner if (TLI.getTargetMachine().getIntrinsicLowering().EmitDebugFunctions()) 901b1a5a5c4c0182205b91b962def7b008228a1f7e6Chris Lattner return "llvm_debugger_stop"; 90236ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner 90336ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner std::string fname = "<unknown>"; 90436ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner std::vector<SDOperand> Ops; 90536ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner 90636ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner // Pull the filename out of the the compilation unit. 90736ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner const GlobalVariable *cunit = dyn_cast<GlobalVariable>(I.getOperand(4)); 90836ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner if (cunit && cunit->hasInitializer()) { 90936ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner ConstantStruct *CS = dyn_cast<ConstantStruct>(cunit->getInitializer()); 91036ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner if (CS->getNumOperands() > 0) { 91136ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner std::string dirname = getStringValue(CS->getOperand(4)); 91236ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner fname = dirname + "/" + getStringValue(CS->getOperand(3)); 91336ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner } 91436ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner } 91536ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner // Input Chain 91636ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner Ops.push_back(getRoot()); 91736ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner 91836ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner // line number 91936ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner Ops.push_back(getValue(I.getOperand(2))); 92036ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner 92136ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner // column 92236ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner Ops.push_back(getValue(I.getOperand(3))); 92336ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner 92436ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner // filename 92536ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner Ops.push_back(DAG.getString(fname)); 92636ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner Ops.push_back(DAG.getString("")); 92736ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner DAG.setRoot(DAG.getNode(ISD::LOCATION, MVT::Other, Ops)); 928d67b3a8bf75d4d3c50263960a9375e6856588f2cChris Lattner setValue(&I, DAG.getNode(ISD::UNDEF, TLI.getValueType(I.getType()))); 929b1a5a5c4c0182205b91b962def7b008228a1f7e6Chris Lattner return 0; 93036ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner } 931c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::dbg_region_start: 932b1a5a5c4c0182205b91b962def7b008228a1f7e6Chris Lattner if (TLI.getTargetMachine().getIntrinsicLowering().EmitDebugFunctions()) 933b1a5a5c4c0182205b91b962def7b008228a1f7e6Chris Lattner return "llvm_dbg_region_start"; 934b1a5a5c4c0182205b91b962def7b008228a1f7e6Chris Lattner if (I.getType() != Type::VoidTy) 935b1a5a5c4c0182205b91b962def7b008228a1f7e6Chris Lattner setValue(&I, DAG.getNode(ISD::UNDEF, TLI.getValueType(I.getType()))); 936b1a5a5c4c0182205b91b962def7b008228a1f7e6Chris Lattner return 0; 937c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::dbg_region_end: 938b1a5a5c4c0182205b91b962def7b008228a1f7e6Chris Lattner if (TLI.getTargetMachine().getIntrinsicLowering().EmitDebugFunctions()) 939b1a5a5c4c0182205b91b962def7b008228a1f7e6Chris Lattner return "llvm_dbg_region_end"; 940b1a5a5c4c0182205b91b962def7b008228a1f7e6Chris Lattner if (I.getType() != Type::VoidTy) 941b1a5a5c4c0182205b91b962def7b008228a1f7e6Chris Lattner setValue(&I, DAG.getNode(ISD::UNDEF, TLI.getValueType(I.getType()))); 942b1a5a5c4c0182205b91b962def7b008228a1f7e6Chris Lattner return 0; 943c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::dbg_func_start: 944b1a5a5c4c0182205b91b962def7b008228a1f7e6Chris Lattner if (TLI.getTargetMachine().getIntrinsicLowering().EmitDebugFunctions()) 945b1a5a5c4c0182205b91b962def7b008228a1f7e6Chris Lattner return "llvm_dbg_subprogram"; 946b1a5a5c4c0182205b91b962def7b008228a1f7e6Chris Lattner if (I.getType() != Type::VoidTy) 947b1a5a5c4c0182205b91b962def7b008228a1f7e6Chris Lattner setValue(&I, DAG.getNode(ISD::UNDEF, TLI.getValueType(I.getType()))); 948b1a5a5c4c0182205b91b962def7b008228a1f7e6Chris Lattner return 0; 949c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::dbg_declare: 950c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner if (I.getType() != Type::VoidTy) 951c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner setValue(&I, DAG.getNode(ISD::UNDEF, TLI.getValueType(I.getType()))); 952c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner return 0; 953c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner 954c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::isunordered: 955c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner setValue(&I, DAG.getSetCC(MVT::i1,getValue(I.getOperand(1)), 956c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner getValue(I.getOperand(2)), ISD::SETUO)); 957c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner return 0; 958c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner 959c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::sqrt: 960c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner setValue(&I, DAG.getNode(ISD::FSQRT, 961c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner getValue(I.getOperand(1)).getValueType(), 962c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner getValue(I.getOperand(1)))); 963c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner return 0; 964c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::pcmarker: { 965c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner SDOperand Tmp = getValue(I.getOperand(1)); 966c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner DAG.setRoot(DAG.getNode(ISD::PCMARKER, MVT::Other, getRoot(), Tmp)); 967c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner return 0; 968c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner } 9698b91c77385a055474d271aa8c10f0382fdeaafebAndrew Lenharth case Intrinsic::readcyclecounter: { 9708b91c77385a055474d271aa8c10f0382fdeaafebAndrew Lenharth std::vector<MVT::ValueType> VTs; 9718b91c77385a055474d271aa8c10f0382fdeaafebAndrew Lenharth VTs.push_back(MVT::i64); 9728b91c77385a055474d271aa8c10f0382fdeaafebAndrew Lenharth VTs.push_back(MVT::Other); 9738b91c77385a055474d271aa8c10f0382fdeaafebAndrew Lenharth std::vector<SDOperand> Ops; 9748b91c77385a055474d271aa8c10f0382fdeaafebAndrew Lenharth Ops.push_back(getRoot()); 9758b91c77385a055474d271aa8c10f0382fdeaafebAndrew Lenharth SDOperand Tmp = DAG.getNode(ISD::READCYCLECOUNTER, VTs, Ops); 9768b91c77385a055474d271aa8c10f0382fdeaafebAndrew Lenharth setValue(&I, Tmp); 9778b91c77385a055474d271aa8c10f0382fdeaafebAndrew Lenharth DAG.setRoot(Tmp.getValue(1)); 97851b8d54922350b7e1c2cd5a5183ef2c5f5d1b1d5Andrew Lenharth return 0; 9798b91c77385a055474d271aa8c10f0382fdeaafebAndrew Lenharth } 980c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::cttz: 981c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner setValue(&I, DAG.getNode(ISD::CTTZ, 982c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner getValue(I.getOperand(1)).getValueType(), 983c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner getValue(I.getOperand(1)))); 984c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner return 0; 985c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::ctlz: 986c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner setValue(&I, DAG.getNode(ISD::CTLZ, 987c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner getValue(I.getOperand(1)).getValueType(), 988c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner getValue(I.getOperand(1)))); 989c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner return 0; 990c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner case Intrinsic::ctpop: 991c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner setValue(&I, DAG.getNode(ISD::CTPOP, 992c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner getValue(I.getOperand(1)).getValueType(), 993c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner getValue(I.getOperand(1)))); 994c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner return 0; 995ac22c83e6853c759a10eb7310b019b22e1d42d16Chris Lattner case Intrinsic::prefetch: 996ac22c83e6853c759a10eb7310b019b22e1d42d16Chris Lattner // FIXME: Currently discarding prefetches. 997ac22c83e6853c759a10eb7310b019b22e1d42d16Chris Lattner return 0; 998c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner default: 999c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner std::cerr << I; 1000c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner assert(0 && "This intrinsic is not implemented yet!"); 1001c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner return 0; 1002c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner } 1003c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner} 1004c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner 1005c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner 10061c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitCall(CallInst &I) { 100764e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner const char *RenameFn = 0; 1008c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner if (Function *F = I.getCalledFunction()) { 1009c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner if (F->isExternal()) 1010c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner if (unsigned IID = F->getIntrinsicID()) { 1011c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner RenameFn = visitIntrinsicCall(I, IID); 1012c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner if (!RenameFn) 1013c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner return; 1014c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner } else { // Not an LLVM intrinsic. 1015c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner const std::string &Name = F->getName(); 1016c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner if (Name[0] == 'f' && (Name == "fabs" || Name == "fabsf")) { 1017c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner if (I.getNumOperands() == 2 && // Basic sanity checks. 1018c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner I.getOperand(1)->getType()->isFloatingPoint() && 1019c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner I.getType() == I.getOperand(1)->getType()) { 1020c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner SDOperand Tmp = getValue(I.getOperand(1)); 1021c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner setValue(&I, DAG.getNode(ISD::FABS, Tmp.getValueType(), Tmp)); 1022c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner return; 1023c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner } 1024c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner } else if (Name[0] == 's' && (Name == "sin" || Name == "sinf")) { 1025f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner if (I.getNumOperands() == 2 && // Basic sanity checks. 1026f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner I.getOperand(1)->getType()->isFloatingPoint() && 1027f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner I.getType() == I.getOperand(1)->getType()) { 1028c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner SDOperand Tmp = getValue(I.getOperand(1)); 1029f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner setValue(&I, DAG.getNode(ISD::FSIN, Tmp.getValueType(), Tmp)); 1030f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner return; 1031f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner } 1032c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner } else if (Name[0] == 'c' && (Name == "cos" || Name == "cosf")) { 1033f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner if (I.getNumOperands() == 2 && // Basic sanity checks. 1034f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner I.getOperand(1)->getType()->isFloatingPoint() && 1035f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner I.getType() == I.getOperand(1)->getType()) { 1036c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner SDOperand Tmp = getValue(I.getOperand(1)); 1037f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner setValue(&I, DAG.getNode(ISD::FCOS, Tmp.getValueType(), Tmp)); 1038f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner return; 1039f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner } 1040f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner } 1041c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner } 1042c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner } 1043edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 104464e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner SDOperand Callee; 104564e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner if (!RenameFn) 104664e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner Callee = getValue(I.getOperand(0)); 104764e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner else 104864e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner Callee = DAG.getExternalSymbol(RenameFn, TLI.getPointerTy()); 10491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::vector<std::pair<SDOperand, const Type*> > Args; 1050c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner Args.reserve(I.getNumOperands()); 10511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (unsigned i = 1, e = I.getNumOperands(); i != e; ++i) { 10521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Value *Arg = I.getOperand(i); 10531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand ArgNode = getValue(Arg); 10541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Args.push_back(std::make_pair(ArgNode, Arg->getType())); 10551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1056edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 10578e21e71b248365c69c0f666518c378b5819ce6fbNate Begeman const PointerType *PT = cast<PointerType>(I.getCalledValue()->getType()); 10588e21e71b248365c69c0f666518c378b5819ce6fbNate Begeman const FunctionType *FTy = cast<FunctionType>(PT->getElementType()); 1059edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 1060cf5734dddd66af9388a171b44996505ede47feedChris Lattner std::pair<SDOperand,SDOperand> Result = 10619092fa310c8b2b1645b0d448c4c34b1e8ddc131dChris Lattner TLI.LowerCallTo(getRoot(), I.getType(), FTy->isVarArg(), I.getCallingConv(), 1062adf6a965a321372c640845407195594835921eb4Chris Lattner I.isTailCall(), Callee, Args, DAG); 10631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (I.getType() != Type::VoidTy) 1064cf5734dddd66af9388a171b44996505ede47feedChris Lattner setValue(&I, Result.first); 1065cf5734dddd66af9388a171b44996505ede47feedChris Lattner DAG.setRoot(Result.second); 10661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 10671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 10681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitMalloc(MallocInst &I) { 10691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Src = getValue(I.getOperand(0)); 10701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 10711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType IntPtr = TLI.getPointerTy(); 107268cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner 107368cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner if (IntPtr < Src.getValueType()) 107468cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner Src = DAG.getNode(ISD::TRUNCATE, IntPtr, Src); 107568cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner else if (IntPtr > Src.getValueType()) 107668cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner Src = DAG.getNode(ISD::ZERO_EXTEND, IntPtr, Src); 10771c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 10781c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Scale the source by the type size. 10791c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner uint64_t ElementSize = TD.getTypeSize(I.getType()->getElementType()); 10801c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Src = DAG.getNode(ISD::MUL, Src.getValueType(), 10811c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Src, getIntPtrConstant(ElementSize)); 10821c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 10831c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::vector<std::pair<SDOperand, const Type*> > Args; 10841c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Args.push_back(std::make_pair(Src, TLI.getTargetData().getIntPtrType())); 1085cf5734dddd66af9388a171b44996505ede47feedChris Lattner 1086cf5734dddd66af9388a171b44996505ede47feedChris Lattner std::pair<SDOperand,SDOperand> Result = 1087adf6a965a321372c640845407195594835921eb4Chris Lattner TLI.LowerCallTo(getRoot(), I.getType(), false, CallingConv::C, true, 1088cf5734dddd66af9388a171b44996505ede47feedChris Lattner DAG.getExternalSymbol("malloc", IntPtr), 1089cf5734dddd66af9388a171b44996505ede47feedChris Lattner Args, DAG); 1090cf5734dddd66af9388a171b44996505ede47feedChris Lattner setValue(&I, Result.first); // Pointers always fit in registers 1091cf5734dddd66af9388a171b44996505ede47feedChris Lattner DAG.setRoot(Result.second); 10921c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 10931c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 10941c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitFree(FreeInst &I) { 10951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::vector<std::pair<SDOperand, const Type*> > Args; 10961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Args.push_back(std::make_pair(getValue(I.getOperand(0)), 10971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TLI.getTargetData().getIntPtrType())); 10981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType IntPtr = TLI.getPointerTy(); 1099cf5734dddd66af9388a171b44996505ede47feedChris Lattner std::pair<SDOperand,SDOperand> Result = 1100adf6a965a321372c640845407195594835921eb4Chris Lattner TLI.LowerCallTo(getRoot(), Type::VoidTy, false, CallingConv::C, true, 1101cf5734dddd66af9388a171b44996505ede47feedChris Lattner DAG.getExternalSymbol("free", IntPtr), Args, DAG); 1102cf5734dddd66af9388a171b44996505ede47feedChris Lattner DAG.setRoot(Result.second); 11031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 11041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1105025c39bf36b6bc2f35a5544338de6cf96fa511a9Chris Lattner// InsertAtEndOfBasicBlock - This method should be implemented by targets that 1106025c39bf36b6bc2f35a5544338de6cf96fa511a9Chris Lattner// mark instructions with the 'usesCustomDAGSchedInserter' flag. These 1107025c39bf36b6bc2f35a5544338de6cf96fa511a9Chris Lattner// instructions are special in various ways, which require special support to 1108025c39bf36b6bc2f35a5544338de6cf96fa511a9Chris Lattner// insert. The specified MachineInstr is created but not inserted into any 1109025c39bf36b6bc2f35a5544338de6cf96fa511a9Chris Lattner// basic blocks, and the scheduler passes ownership of it to this method. 1110025c39bf36b6bc2f35a5544338de6cf96fa511a9Chris LattnerMachineBasicBlock *TargetLowering::InsertAtEndOfBasicBlock(MachineInstr *MI, 1111025c39bf36b6bc2f35a5544338de6cf96fa511a9Chris Lattner MachineBasicBlock *MBB) { 1112025c39bf36b6bc2f35a5544338de6cf96fa511a9Chris Lattner std::cerr << "If a target marks an instruction with " 1113025c39bf36b6bc2f35a5544338de6cf96fa511a9Chris Lattner "'usesCustomDAGSchedInserter', it must implement " 1114025c39bf36b6bc2f35a5544338de6cf96fa511a9Chris Lattner "TargetLowering::InsertAtEndOfBasicBlock!\n"; 1115025c39bf36b6bc2f35a5544338de6cf96fa511a9Chris Lattner abort(); 1116025c39bf36b6bc2f35a5544338de6cf96fa511a9Chris Lattner return 0; 1117025c39bf36b6bc2f35a5544338de6cf96fa511a9Chris Lattner} 1118025c39bf36b6bc2f35a5544338de6cf96fa511a9Chris Lattner 11194a95945fa5aa431110f50092f4a45d24772a553bNate BegemanSDOperand TargetLowering::LowerReturnTo(SDOperand Chain, SDOperand Op, 11204a95945fa5aa431110f50092f4a45d24772a553bNate Begeman SelectionDAG &DAG) { 11214a95945fa5aa431110f50092f4a45d24772a553bNate Begeman return DAG.getNode(ISD::RET, MVT::Other, Chain, Op); 11224a95945fa5aa431110f50092f4a45d24772a553bNate Begeman} 11234a95945fa5aa431110f50092f4a45d24772a553bNate Begeman 1124e64e72b794cfa385372436b3c88460aeee0acbf6Chris LattnerSDOperand TargetLowering::LowerVAStart(SDOperand Chain, 1125e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SDOperand VAListP, Value *VAListV, 1126e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SelectionDAG &DAG) { 11271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // We have no sane default behavior, just emit a useful error message and bail 11281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // out. 112939ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner std::cerr << "Variable arguments handling not implemented on this target!\n"; 11301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner abort(); 1131e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner return SDOperand(); 11321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 11331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1134e64e72b794cfa385372436b3c88460aeee0acbf6Chris LattnerSDOperand TargetLowering::LowerVAEnd(SDOperand Chain, SDOperand LP, Value *LV, 113539ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner SelectionDAG &DAG) { 113639ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner // Default to a noop. 113739ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner return Chain; 113839ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner} 113939ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner 1140e64e72b794cfa385372436b3c88460aeee0acbf6Chris LattnerSDOperand TargetLowering::LowerVACopy(SDOperand Chain, 1141e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SDOperand SrcP, Value *SrcV, 1142e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SDOperand DestP, Value *DestV, 1143e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SelectionDAG &DAG) { 1144e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner // Default to copying the input list. 1145e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SDOperand Val = DAG.getLoad(getPointerTy(), Chain, 1146e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SrcP, DAG.getSrcValue(SrcV)); 1147213e557cef3e653e2d3a00b07b137c143128430aAndrew Lenharth SDOperand Result = DAG.getNode(ISD::STORE, MVT::Other, Val.getValue(1), 1148e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner Val, DestP, DAG.getSrcValue(DestV)); 1149e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner return Result; 115039ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner} 115139ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner 115239ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattnerstd::pair<SDOperand,SDOperand> 1153e64e72b794cfa385372436b3c88460aeee0acbf6Chris LattnerTargetLowering::LowerVAArg(SDOperand Chain, SDOperand VAListP, Value *VAListV, 1154e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner const Type *ArgTy, SelectionDAG &DAG) { 11551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // We have no sane default behavior, just emit a useful error message and bail 11561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // out. 115739ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner std::cerr << "Variable arguments handling not implemented on this target!\n"; 11581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner abort(); 1159d3f03e4b50feb6abfa9fec8b0aa705d45134c59eMisha Brukman return std::make_pair(SDOperand(), SDOperand()); 11601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 116139ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner 116239ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner 116339ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattnervoid SelectionDAGLowering::visitVAStart(CallInst &I) { 1164e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner DAG.setRoot(TLI.LowerVAStart(getRoot(), getValue(I.getOperand(1)), 1165e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner I.getOperand(1), DAG)); 116639ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner} 116739ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner 11681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitVAArg(VAArgInst &I) { 116939ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner std::pair<SDOperand,SDOperand> Result = 1170e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner TLI.LowerVAArg(getRoot(), getValue(I.getOperand(0)), I.getOperand(0), 1171558bc88a00930fce283b240b7c9555f649a18f1bAndrew Lenharth I.getType(), DAG); 117239ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner setValue(&I, Result.first); 117339ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner DAG.setRoot(Result.second); 11741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 11751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11761c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitVAEnd(CallInst &I) { 117700b16889ab461b7ecef1c91ade101186b7f1fce2Jeff Cohen DAG.setRoot(TLI.LowerVAEnd(getRoot(), getValue(I.getOperand(1)), 1178e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner I.getOperand(1), DAG)); 11791c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 11801c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11811c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitVACopy(CallInst &I) { 1182e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SDOperand Result = 1183e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner TLI.LowerVACopy(getRoot(), getValue(I.getOperand(2)), I.getOperand(2), 1184e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner getValue(I.getOperand(1)), I.getOperand(1), DAG); 1185e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner DAG.setRoot(Result); 11861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 11871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 118939ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner// It is always conservatively correct for llvm.returnaddress and 119039ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner// llvm.frameaddress to return 0. 119139ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattnerstd::pair<SDOperand, SDOperand> 119239ae3622791986a0232f7e4797b633f8fa9e54d2Chris LattnerTargetLowering::LowerFrameReturnAddress(bool isFrameAddr, SDOperand Chain, 119339ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner unsigned Depth, SelectionDAG &DAG) { 119439ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner return std::make_pair(DAG.getConstant(0, getPointerTy()), Chain); 11951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 11961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 119750381b6c4180e9a2b983d4623da2e485cd768632Chris LattnerSDOperand TargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) { 1198171453a284b097f1ee89fb87ff495c3a6c7b6297Chris Lattner assert(0 && "LowerOperation not implemented for this target!"); 1199171453a284b097f1ee89fb87ff495c3a6c7b6297Chris Lattner abort(); 1200d3f03e4b50feb6abfa9fec8b0aa705d45134c59eMisha Brukman return SDOperand(); 1201171453a284b097f1ee89fb87ff495c3a6c7b6297Chris Lattner} 1202171453a284b097f1ee89fb87ff495c3a6c7b6297Chris Lattner 120339ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattnervoid SelectionDAGLowering::visitFrameReturnAddress(CallInst &I, bool isFrame) { 120439ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner unsigned Depth = (unsigned)cast<ConstantUInt>(I.getOperand(1))->getValue(); 120539ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner std::pair<SDOperand,SDOperand> Result = 1206a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner TLI.LowerFrameReturnAddress(isFrame, getRoot(), Depth, DAG); 120739ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner setValue(&I, Result.first); 120839ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner DAG.setRoot(Result.second); 120939ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner} 12101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 12117041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattnervoid SelectionDAGLowering::visitMemIntrinsic(CallInst &I, unsigned Op) { 12126ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer#if 0 12136ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer // If the size of the cpy/move/set is constant (known) 12146ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer if (ConstantUInt* op3 = dyn_cast<ConstantUInt>(I.getOperand(3))) { 12156ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer uint64_t size = op3->getValue(); 12166ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer switch (Op) { 12176ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer case ISD::MEMSET: 12186ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer if (size <= TLI.getMaxStoresPerMemSet()) { 12196ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer if (ConstantUInt* op4 = dyn_cast<ConstantUInt>(I.getOperand(4))) { 12206ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer uint64_t TySize = TLI.getTargetData().getTypeSize(Ty); 12216ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer uint64_t align = op4.getValue(); 12226ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer while (size > align) { 12236ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer size -=align; 12246ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer } 12256ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer Value *SrcV = I.getOperand(0); 12266ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer SDOperand Src = getValue(SrcV); 12276ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer SDOperand Ptr = getValue(I.getOperand(1)); 12286ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer DAG.setRoot(DAG.getNode(ISD::STORE, MVT::Other, getRoot(), Src, Ptr, 12296ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer DAG.getSrcValue(I.getOperand(1)))); 12306ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer } 12316ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer break; 12326ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer } 12336ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer break; // don't do this optimization, use a normal memset 12346ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer case ISD::MEMMOVE: 12356ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer case ISD::MEMCPY: 12366ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer break; // FIXME: not implemented yet 12376ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer } 12386ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer } 12396ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer#endif 12406ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer 12416ff7240a5c484af6e42e2ba6a6d7e03ddf844922Reid Spencer // Non-optimized version 12427041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner std::vector<SDOperand> Ops; 1243a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner Ops.push_back(getRoot()); 12447041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner Ops.push_back(getValue(I.getOperand(1))); 12457041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner Ops.push_back(getValue(I.getOperand(2))); 12467041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner Ops.push_back(getValue(I.getOperand(3))); 12477041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner Ops.push_back(getValue(I.getOperand(4))); 12487041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner DAG.setRoot(DAG.getNode(Op, MVT::Other, Ops)); 12491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 12501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 12517041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner//===----------------------------------------------------------------------===// 12527041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner// SelectionDAGISel code 12537041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner//===----------------------------------------------------------------------===// 12541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 12551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerunsigned SelectionDAGISel::MakeReg(MVT::ValueType VT) { 12561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return RegMap->createVirtualRegister(TLI.getRegClassFor(VT)); 12571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 12581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1259495a0b51915eb763576874f29192820b731edc22Chris Lattnervoid SelectionDAGISel::getAnalysisUsage(AnalysisUsage &AU) const { 126036b708f05720c407f5e5657f2fd4b0677702ad46Chris Lattner // FIXME: we only modify the CFG to split critical edges. This 126136b708f05720c407f5e5657f2fd4b0677702ad46Chris Lattner // updates dom and loop info. 1262495a0b51915eb763576874f29192820b731edc22Chris Lattner} 12631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1264c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 1265c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner/// InsertGEPComputeCode - Insert code into BB to compute Ptr+PtrOffset, 1266c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner/// casting to the type of GEPI. 1267c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattnerstatic Value *InsertGEPComputeCode(Value *&V, BasicBlock *BB, Instruction *GEPI, 1268c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner Value *Ptr, Value *PtrOffset) { 1269c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner if (V) return V; // Already computed. 1270c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 1271c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner BasicBlock::iterator InsertPt; 1272c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner if (BB == GEPI->getParent()) { 1273c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // If insert into the GEP's block, insert right after the GEP. 1274c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner InsertPt = GEPI; 1275c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner ++InsertPt; 1276c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner } else { 1277c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // Otherwise, insert at the top of BB, after any PHI nodes 1278c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner InsertPt = BB->begin(); 1279c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner while (isa<PHINode>(InsertPt)) ++InsertPt; 1280c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner } 1281c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 1282c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner // If Ptr is itself a cast, but in some other BB, emit a copy of the cast into 1283c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner // BB so that there is only one value live across basic blocks (the cast 1284c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner // operand). 1285c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner if (CastInst *CI = dyn_cast<CastInst>(Ptr)) 1286c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner if (CI->getParent() != BB && isa<PointerType>(CI->getOperand(0)->getType())) 1287c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner Ptr = new CastInst(CI->getOperand(0), CI->getType(), "", InsertPt); 1288c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner 1289c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // Add the offset, cast it to the right type. 1290c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner Ptr = BinaryOperator::createAdd(Ptr, PtrOffset, "", InsertPt); 1291c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner Ptr = new CastInst(Ptr, GEPI->getType(), "", InsertPt); 1292c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner return V = Ptr; 1293c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner} 1294c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 1295c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 1296c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner/// OptimizeGEPExpression - Since we are doing basic-block-at-a-time instruction 1297c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner/// selection, we want to be a bit careful about some things. In particular, if 1298c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner/// we have a GEP instruction that is used in a different block than it is 1299c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner/// defined, the addressing expression of the GEP cannot be folded into loads or 1300c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner/// stores that use it. In this case, decompose the GEP and move constant 1301c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner/// indices into blocks that use it. 1302c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattnerstatic void OptimizeGEPExpression(GetElementPtrInst *GEPI, 1303c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner const TargetData &TD) { 1304c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner if (!GEPISelTest) return; 1305c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 1306c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // If this GEP is only used inside the block it is defined in, there is no 1307c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // need to rewrite it. 1308c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner bool isUsedOutsideDefBB = false; 1309c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner BasicBlock *DefBB = GEPI->getParent(); 1310c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner for (Value::use_iterator UI = GEPI->use_begin(), E = GEPI->use_end(); 1311c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner UI != E; ++UI) { 1312c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner if (cast<Instruction>(*UI)->getParent() != DefBB) { 1313c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner isUsedOutsideDefBB = true; 1314c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner break; 1315c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner } 1316c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner } 1317c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner if (!isUsedOutsideDefBB) return; 1318c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 1319c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // If this GEP has no non-zero constant indices, there is nothing we can do, 1320c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // ignore it. 1321c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner bool hasConstantIndex = false; 1322c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner for (GetElementPtrInst::op_iterator OI = GEPI->op_begin()+1, 1323c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner E = GEPI->op_end(); OI != E; ++OI) { 1324c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner if (ConstantInt *CI = dyn_cast<ConstantInt>(*OI)) 1325c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner if (CI->getRawValue()) { 1326c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner hasConstantIndex = true; 1327c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner break; 1328c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner } 1329c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner } 13303802c2552fe4475418db3c948e7601d7259f996dChris Lattner // If this is a GEP &Alloca, 0, 0, forward subst the frame index into uses. 13313802c2552fe4475418db3c948e7601d7259f996dChris Lattner if (!hasConstantIndex && !isa<AllocaInst>(GEPI->getOperand(0))) return; 1332c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 1333c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // Otherwise, decompose the GEP instruction into multiplies and adds. Sum the 1334c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // constant offset (which we now know is non-zero) and deal with it later. 1335c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner uint64_t ConstantOffset = 0; 1336c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner const Type *UIntPtrTy = TD.getIntPtrType(); 1337c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner Value *Ptr = new CastInst(GEPI->getOperand(0), UIntPtrTy, "", GEPI); 1338c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner const Type *Ty = GEPI->getOperand(0)->getType(); 1339c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 1340c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner for (GetElementPtrInst::op_iterator OI = GEPI->op_begin()+1, 1341c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner E = GEPI->op_end(); OI != E; ++OI) { 1342c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner Value *Idx = *OI; 1343c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner if (const StructType *StTy = dyn_cast<StructType>(Ty)) { 1344c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner unsigned Field = cast<ConstantUInt>(Idx)->getValue(); 1345c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner if (Field) 1346c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner ConstantOffset += TD.getStructLayout(StTy)->MemberOffsets[Field]; 1347c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner Ty = StTy->getElementType(Field); 1348c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner } else { 1349c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner Ty = cast<SequentialType>(Ty)->getElementType(); 1350c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 1351c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // Handle constant subscripts. 1352c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner if (ConstantInt *CI = dyn_cast<ConstantInt>(Idx)) { 1353c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner if (CI->getRawValue() == 0) continue; 1354c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 1355c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner if (ConstantSInt *CSI = dyn_cast<ConstantSInt>(CI)) 1356c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner ConstantOffset += (int64_t)TD.getTypeSize(Ty)*CSI->getValue(); 1357c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner else 1358c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner ConstantOffset+=TD.getTypeSize(Ty)*cast<ConstantUInt>(CI)->getValue(); 1359c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner continue; 1360c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner } 1361c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 1362c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // Ptr = Ptr + Idx * ElementSize; 1363c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 1364c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // Cast Idx to UIntPtrTy if needed. 1365c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner Idx = new CastInst(Idx, UIntPtrTy, "", GEPI); 1366c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 1367c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner uint64_t ElementSize = TD.getTypeSize(Ty); 1368c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // Mask off bits that should not be set. 1369c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner ElementSize &= ~0ULL >> (64-UIntPtrTy->getPrimitiveSizeInBits()); 1370c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner Constant *SizeCst = ConstantUInt::get(UIntPtrTy, ElementSize); 1371c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 1372c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // Multiply by the element size and add to the base. 1373c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner Idx = BinaryOperator::createMul(Idx, SizeCst, "", GEPI); 1374c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner Ptr = BinaryOperator::createAdd(Ptr, Idx, "", GEPI); 1375c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner } 1376c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner } 1377c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 1378c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // Make sure that the offset fits in uintptr_t. 1379c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner ConstantOffset &= ~0ULL >> (64-UIntPtrTy->getPrimitiveSizeInBits()); 1380c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner Constant *PtrOffset = ConstantUInt::get(UIntPtrTy, ConstantOffset); 1381c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 1382c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // Okay, we have now emitted all of the variable index parts to the BB that 1383c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // the GEP is defined in. Loop over all of the using instructions, inserting 1384c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // an "add Ptr, ConstantOffset" into each block that uses it and update the 1385c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner // instruction to use the newly computed value, making GEPI dead. When the 1386c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner // user is a load or store instruction address, we emit the add into the user 1387c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner // block, otherwise we use a canonical version right next to the gep (these 1388c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner // won't be foldable as addresses, so we might as well share the computation). 1389c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner 1390c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner std::map<BasicBlock*,Value*> InsertedExprs; 1391c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner while (!GEPI->use_empty()) { 1392c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner Instruction *User = cast<Instruction>(GEPI->use_back()); 1393c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner 1394c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner // If this use is not foldable into the addressing mode, use a version 1395c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner // emitted in the GEP block. 1396c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner Value *NewVal; 1397c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner if (!isa<LoadInst>(User) && 1398c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner (!isa<StoreInst>(User) || User->getOperand(0) == GEPI)) { 1399c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner NewVal = InsertGEPComputeCode(InsertedExprs[DefBB], DefBB, GEPI, 1400c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner Ptr, PtrOffset); 1401c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner } else { 1402c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner // Otherwise, insert the code in the User's block so it can be folded into 1403c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner // any users in that block. 1404c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner NewVal = InsertGEPComputeCode(InsertedExprs[User->getParent()], 1405c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner User->getParent(), GEPI, 1406c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner Ptr, PtrOffset); 1407c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner } 1408c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner User->replaceUsesOfWith(GEPI, NewVal); 1409c78b0b740bcf2e00a8871090709c3571fe442f07Chris Lattner } 1410c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 1411c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // Finally, the GEP is dead, remove it. 1412c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner GEPI->eraseFromParent(); 1413c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner} 1414c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 14151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerbool SelectionDAGISel::runOnFunction(Function &Fn) { 14161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineFunction &MF = MachineFunction::construct(&Fn, TLI.getTargetMachine()); 14171c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner RegMap = MF.getSSARegMap(); 14181c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(std::cerr << "\n\n\n=== " << Fn.getName() << "\n"); 14191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1420c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // First, split all critical edges for PHI nodes with incoming values that are 1421c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // constants, this way the load of the constant into a vreg will not be placed 1422c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // into MBBs that are used some other way. 1423c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // 1424c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // In this pass we also look for GEP instructions that are used across basic 1425c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // blocks and rewrites them to improve basic-block-at-a-time selection. 1426c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner // 142736b708f05720c407f5e5657f2fd4b0677702ad46Chris Lattner for (Function::iterator BB = Fn.begin(), E = Fn.end(); BB != E; ++BB) { 142836b708f05720c407f5e5657f2fd4b0677702ad46Chris Lattner PHINode *PN; 1429c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner BasicBlock::iterator BBI; 1430c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner for (BBI = BB->begin(); (PN = dyn_cast<PHINode>(BBI)); ++BBI) 143136b708f05720c407f5e5657f2fd4b0677702ad46Chris Lattner for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) 143236b708f05720c407f5e5657f2fd4b0677702ad46Chris Lattner if (isa<Constant>(PN->getIncomingValue(i))) 143336b708f05720c407f5e5657f2fd4b0677702ad46Chris Lattner SplitCriticalEdge(PN->getIncomingBlock(i), BB); 1434c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner 1435c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner for (BasicBlock::iterator E = BB->end(); BBI != E; ) 1436c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(BBI++)) 1437c88d8e944dae71e31595b8ae264668e68db6b8edChris Lattner OptimizeGEPExpression(GEPI, TLI.getTargetData()); 143836b708f05720c407f5e5657f2fd4b0677702ad46Chris Lattner } 1439c9ea6fde305b35ab7c9f909ac390d4b53e33d536Chris Lattner 14401c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FunctionLoweringInfo FuncInfo(TLI, Fn, MF); 14411c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 14421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (Function::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I) 14431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SelectBasicBlock(I, MF, FuncInfo); 1444edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 14451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return true; 14461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 14471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 14481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1449ddb870b065984007a0df645ad97c6ad6a6f12de0Chris LattnerSDOperand SelectionDAGISel:: 1450ddb870b065984007a0df645ad97c6ad6a6f12de0Chris LattnerCopyValueToVirtualRegister(SelectionDAGLowering &SDL, Value *V, unsigned Reg) { 1451f1fdacae8c1bd9e5ff4619546b3a28e93fb75ab5Chris Lattner SDOperand Op = SDL.getValue(V); 145218c2f13e0f9d0e5d6227cf6d1881e9ee3d1b6109Chris Lattner assert((Op.getOpcode() != ISD::CopyFromReg || 1453d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner cast<RegisterSDNode>(Op.getOperand(1))->getReg() != Reg) && 145418c2f13e0f9d0e5d6227cf6d1881e9ee3d1b6109Chris Lattner "Copy from a reg to the same reg!"); 1455d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner 1456d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // If this type is not legal, we must make sure to not create an invalid 1457d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // register use. 1458d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner MVT::ValueType SrcVT = Op.getValueType(); 1459d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner MVT::ValueType DestVT = TLI.getTypeToTransformTo(SrcVT); 1460d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner SelectionDAG &DAG = SDL.DAG; 1461d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner if (SrcVT == DestVT) { 1462d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner return DAG.getCopyToReg(SDL.getRoot(), Reg, Op); 1463d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner } else if (SrcVT < DestVT) { 1464d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // The src value is promoted to the register. 1465fae59b99b8d1942f30a4be609423282c3fd62dd8Chris Lattner if (MVT::isFloatingPoint(SrcVT)) 1466fae59b99b8d1942f30a4be609423282c3fd62dd8Chris Lattner Op = DAG.getNode(ISD::FP_EXTEND, DestVT, Op); 1467fae59b99b8d1942f30a4be609423282c3fd62dd8Chris Lattner else 1468fab08875b73656f373b10a59aad475615df82bafChris Lattner Op = DAG.getNode(ISD::ANY_EXTEND, DestVT, Op); 1469d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner return DAG.getCopyToReg(SDL.getRoot(), Reg, Op); 1470d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner } else { 1471d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // The src value is expanded into multiple registers. 1472d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, DestVT, 1473d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner Op, DAG.getConstant(0, MVT::i32)); 1474d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, DestVT, 1475d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner Op, DAG.getConstant(1, MVT::i32)); 1476d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner Op = DAG.getCopyToReg(SDL.getRoot(), Reg, Lo); 1477d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner return DAG.getCopyToReg(Op, Reg+1, Hi); 1478d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner } 14791c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 14801c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1481068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattnervoid SelectionDAGISel:: 1482068a81e9fca511b9a3b3a0f28a8988a57f994652Chris LattnerLowerArguments(BasicBlock *BB, SelectionDAGLowering &SDL, 1483068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner std::vector<SDOperand> &UnorderedChains) { 14841c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If this is the entry block, emit arguments. 1485068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner Function &F = *BB->getParent(); 14860afa8e348eab21d3e09ae3240544886d61879266Chris Lattner FunctionLoweringInfo &FuncInfo = SDL.FuncInfo; 1487bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner SDOperand OldRoot = SDL.DAG.getRoot(); 1488bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner std::vector<SDOperand> Args = TLI.LowerArguments(F, SDL.DAG); 1489bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner 1490bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner unsigned a = 0; 1491bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner for (Function::arg_iterator AI = F.arg_begin(), E = F.arg_end(); 1492bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner AI != E; ++AI, ++a) 1493bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner if (!AI->use_empty()) { 1494bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner SDL.setValue(AI, Args[a]); 1495fa57702388f139e964befecb4b98c7dfe836945fChris Lattner 1496bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner // If this argument is live outside of the entry block, insert a copy from 1497bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner // whereever we got it to the vreg that other BB's will reference it as. 1498bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner if (FuncInfo.ValueMap.count(AI)) { 1499bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner SDOperand Copy = 1500bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner CopyValueToVirtualRegister(SDL, AI, FuncInfo.ValueMap[AI]); 1501bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner UnorderedChains.push_back(Copy); 1502bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner } 15030afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } 1504bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner 1505bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner // Next, if the function has live ins that need to be copied into vregs, 1506bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner // emit the copies now, into the top of the block. 1507bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner MachineFunction &MF = SDL.DAG.getMachineFunction(); 1508bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner if (MF.livein_begin() != MF.livein_end()) { 1509bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner SSARegMap *RegMap = MF.getSSARegMap(); 1510bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner const MRegisterInfo &MRI = *MF.getTarget().getRegisterInfo(); 1511bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner for (MachineFunction::livein_iterator LI = MF.livein_begin(), 1512bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner E = MF.livein_end(); LI != E; ++LI) 1513bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner if (LI->second) 1514bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner MRI.copyRegToReg(*MF.begin(), MF.begin()->end(), LI->second, 1515bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner LI->first, RegMap->getRegClass(LI->second)); 15161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1517bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner 1518bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner // Finally, if the target has anything special to do, allow it to do so. 1519bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner EmitFunctionEntryCode(F, SDL.DAG.getMachineFunction()); 1520068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner} 1521068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner 1522068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner 1523068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattnervoid SelectionDAGISel::BuildSelectionDAG(SelectionDAG &DAG, BasicBlock *LLVMBB, 1524068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner std::vector<std::pair<MachineInstr*, unsigned> > &PHINodesToUpdate, 1525068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner FunctionLoweringInfo &FuncInfo) { 1526068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner SelectionDAGLowering SDL(DAG, TLI, FuncInfo); 1527068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner 1528068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner std::vector<SDOperand> UnorderedChains; 1529edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 1530bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner // Lower any arguments needed in this block if this is the entry block. 1531bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner if (LLVMBB == &LLVMBB->getParent()->front()) 1532bf209489ad3f7a38ce6b2159b22d8727500e60c2Chris Lattner LowerArguments(LLVMBB, SDL, UnorderedChains); 15331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 15341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner BB = FuncInfo.MBBMap[LLVMBB]; 15351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDL.setCurrentBasicBlock(BB); 15361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 15371c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Lower all of the non-terminator instructions. 15381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (BasicBlock::iterator I = LLVMBB->begin(), E = --LLVMBB->end(); 15391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner I != E; ++I) 15401c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDL.visit(*I); 15411c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 15421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Ensure that all instructions which are used outside of their defining 15431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // blocks are available as virtual registers. 15441c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (BasicBlock::iterator I = LLVMBB->begin(), E = LLVMBB->end(); I != E;++I) 1545f1fdacae8c1bd9e5ff4619546b3a28e93fb75ab5Chris Lattner if (!I->use_empty() && !isa<PHINode>(I)) { 1546ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner std::map<const Value*, unsigned>::iterator VMI =FuncInfo.ValueMap.find(I); 15471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (VMI != FuncInfo.ValueMap.end()) 1548ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner UnorderedChains.push_back( 1549ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner CopyValueToVirtualRegister(SDL, I, VMI->second)); 15501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 15511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 15521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Handle PHI nodes in successor blocks. Emit code into the SelectionDAG to 15531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // ensure constants are generated when needed. Remember the virtual registers 15541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // that need to be added to the Machine PHI nodes as input. We cannot just 15551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // directly add them, because expansion might result in multiple MBB's for one 15561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // BB. As such, the start of the BB might correspond to a different MBB than 15571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // the end. 1558edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman // 15591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 15601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Emit constants only once even if used by multiple PHI nodes. 15611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<Constant*, unsigned> ConstantsOut; 15621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 15631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Check successor nodes PHI nodes that expect a constant to be available from 15641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // this block. 15651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TerminatorInst *TI = LLVMBB->getTerminator(); 15661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (unsigned succ = 0, e = TI->getNumSuccessors(); succ != e; ++succ) { 15671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner BasicBlock *SuccBB = TI->getSuccessor(succ); 15681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock::iterator MBBI = FuncInfo.MBBMap[SuccBB]->begin(); 15691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner PHINode *PN; 15701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 15711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // At this point we know that there is a 1-1 correspondence between LLVM PHI 15721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // nodes and Machine PHI nodes, but the incoming operands have not been 15731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // emitted yet. 15741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (BasicBlock::iterator I = SuccBB->begin(); 1575f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner (PN = dyn_cast<PHINode>(I)); ++I) 1576f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner if (!PN->use_empty()) { 1577f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner unsigned Reg; 1578f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner Value *PHIOp = PN->getIncomingValueForBlock(LLVMBB); 1579f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner if (Constant *C = dyn_cast<Constant>(PHIOp)) { 1580f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner unsigned &RegOut = ConstantsOut[C]; 1581f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner if (RegOut == 0) { 1582f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner RegOut = FuncInfo.CreateRegForValue(C); 1583ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner UnorderedChains.push_back( 1584ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner CopyValueToVirtualRegister(SDL, C, RegOut)); 1585f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner } 1586f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner Reg = RegOut; 1587f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner } else { 1588f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner Reg = FuncInfo.ValueMap[PHIOp]; 1589ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner if (Reg == 0) { 1590edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman assert(isa<AllocaInst>(PHIOp) && 1591ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner FuncInfo.StaticAllocaMap.count(cast<AllocaInst>(PHIOp)) && 1592ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner "Didn't codegen value into a register!??"); 1593ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner Reg = FuncInfo.CreateRegForValue(PHIOp); 1594ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner UnorderedChains.push_back( 1595ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner CopyValueToVirtualRegister(SDL, PHIOp, Reg)); 1596ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner } 15971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1598edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 1599f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner // Remember that this register needs to added to the machine PHI node as 1600f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner // the input for this MBB. 1601f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner unsigned NumElements = 1602f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner TLI.getNumElements(TLI.getValueType(PN->getType())); 1603f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner for (unsigned i = 0, e = NumElements; i != e; ++i) 1604f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner PHINodesToUpdate.push_back(std::make_pair(MBBI++, Reg+i)); 16051c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 16061c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 16071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner ConstantsOut.clear(); 16081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1609ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner // Turn all of the unordered chains into one factored node. 16105a6c6d98d561df671350a56c8031a3611f1c46faChris Lattner if (!UnorderedChains.empty()) { 16117436b57de32333cc337b8c7cea208c8863eee793Chris Lattner SDOperand Root = SDL.getRoot(); 16127436b57de32333cc337b8c7cea208c8863eee793Chris Lattner if (Root.getOpcode() != ISD::EntryToken) { 16137436b57de32333cc337b8c7cea208c8863eee793Chris Lattner unsigned i = 0, e = UnorderedChains.size(); 16147436b57de32333cc337b8c7cea208c8863eee793Chris Lattner for (; i != e; ++i) { 16157436b57de32333cc337b8c7cea208c8863eee793Chris Lattner assert(UnorderedChains[i].Val->getNumOperands() > 1); 16167436b57de32333cc337b8c7cea208c8863eee793Chris Lattner if (UnorderedChains[i].Val->getOperand(0) == Root) 16177436b57de32333cc337b8c7cea208c8863eee793Chris Lattner break; // Don't add the root if we already indirectly depend on it. 16187436b57de32333cc337b8c7cea208c8863eee793Chris Lattner } 16197436b57de32333cc337b8c7cea208c8863eee793Chris Lattner 16207436b57de32333cc337b8c7cea208c8863eee793Chris Lattner if (i == e) 16217436b57de32333cc337b8c7cea208c8863eee793Chris Lattner UnorderedChains.push_back(Root); 16227436b57de32333cc337b8c7cea208c8863eee793Chris Lattner } 1623ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other, UnorderedChains)); 1624ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner } 1625ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner 16261c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Lower the terminator after the copies are emitted. 16271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDL.visit(*LLVMBB->getTerminator()); 1628a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner 1629a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner // Make sure the root of the DAG is up-to-date. 1630a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(SDL.getRoot()); 16311c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 16321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 16331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGISel::SelectBasicBlock(BasicBlock *LLVMBB, MachineFunction &MF, 16341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FunctionLoweringInfo &FuncInfo) { 1635ac9dc08c7f0ae60c125624d72c3022025d79ee9eChris Lattner SelectionDAG DAG(TLI, MF); 16361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner CurDAG = &DAG; 16371c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::vector<std::pair<MachineInstr*, unsigned> > PHINodesToUpdate; 16381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 16391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // First step, lower LLVM code to some DAG. This DAG may use operations and 16401c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // types that are not supported by the target. 16411c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner BuildSelectionDAG(DAG, LLVMBB, PHINodesToUpdate, FuncInfo); 16421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1643af21d55aee8d6852fedfd630395a3c7c95df8f12Chris Lattner // Run the DAG combiner in pre-legalize mode. 1644af21d55aee8d6852fedfd630395a3c7c95df8f12Chris Lattner DAG.Combine(false); 16452300f5504643eaddc307d3db8a3ccd224c4fa251Nate Begeman 16461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(std::cerr << "Lowered selection DAG:\n"); 16471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(DAG.dump()); 16481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 16491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Second step, hack on the DAG until it only uses operations and types that 16501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // the target supports. 1651ac9dc08c7f0ae60c125624d72c3022025d79ee9eChris Lattner DAG.Legalize(); 16521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 16531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(std::cerr << "Legalized selection DAG:\n"); 16541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(DAG.dump()); 16551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1656af21d55aee8d6852fedfd630395a3c7c95df8f12Chris Lattner // Run the DAG combiner in post-legalize mode. 1657af21d55aee8d6852fedfd630395a3c7c95df8f12Chris Lattner DAG.Combine(true); 16582300f5504643eaddc307d3db8a3ccd224c4fa251Nate Begeman 1659d48050aa1509130871b8bb2453270c92b969c2e7Chris Lattner if (ViewDAGs) DAG.viewGraph(); 1660d48050aa1509130871b8bb2453270c92b969c2e7Chris Lattner 1661a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // Third, instruction select all of the operations to machine code, adding the 1662a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // code to the MachineBasicBlock. 16631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner InstructionSelectBasicBlock(DAG); 16641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 16651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(std::cerr << "Selected machine code:\n"); 16661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(BB->dump()); 16671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1668a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // Next, now that we know what the last MBB the LLVM BB expanded is, update 16691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // PHI nodes in successors. 16701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (unsigned i = 0, e = PHINodesToUpdate.size(); i != e; ++i) { 16711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineInstr *PHI = PHINodesToUpdate[i].first; 16721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(PHI->getOpcode() == TargetInstrInfo::PHI && 16731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner "This is not a machine PHI node that we are updating!"); 16741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner PHI->addRegOperand(PHINodesToUpdate[i].second); 16751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner PHI->addMachineBasicBlockOperand(BB); 16761c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1677a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner 1678a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // Finally, add the CFG edges from the last selected MBB to the successor 1679a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // MBBs. 1680a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner TerminatorInst *TI = LLVMBB->getTerminator(); 1681a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner for (unsigned i = 0, e = TI->getNumSuccessors(); i != e; ++i) { 1682a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner MachineBasicBlock *Succ0MBB = FuncInfo.MBBMap[TI->getSuccessor(i)]; 1683a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner BB->addSuccessor(Succ0MBB); 1684a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner } 16851c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 1686