SelectionDAGISel.cpp revision fae59b99b8d1942f30a4be609423282c3fd62dd8
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" 201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Instructions.h" 211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Intrinsics.h" 221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/CodeGen/MachineFunction.h" 231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/CodeGen/MachineFrameInfo.h" 241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/CodeGen/MachineInstrBuilder.h" 251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/CodeGen/SelectionDAG.h" 261c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/CodeGen/SSARegMap.h" 271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Target/TargetData.h" 281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Target/TargetFrameInfo.h" 291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Target/TargetInstrInfo.h" 301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Target/TargetLowering.h" 311c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Target/TargetMachine.h" 327944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner#include "llvm/Support/CommandLine.h" 331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Support/Debug.h" 341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include <map> 351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include <iostream> 361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerusing namespace llvm; 371c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 387944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner#ifndef _NDEBUG 397944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattnerstatic cl::opt<bool> 407944d9d9957db1efe085d9df3ea89826f50029b7Chris LattnerViewDAGs("view-isel-dags", cl::Hidden, 417944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner cl::desc("Pop up a window to show isel dags as they are selected")); 427944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner#else 437944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattnerstatic const bool ViewDAGS = 0; 447944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner#endif 457944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner 461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnernamespace llvm { 471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner //===--------------------------------------------------------------------===// 481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// FunctionLoweringInfo - This contains information that is global to a 491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// function that is used when lowering a region of the function. 50f26bc8ef4827cf0023a7052b62b920b41813d473Chris Lattner class FunctionLoweringInfo { 51f26bc8ef4827cf0023a7052b62b920b41813d473Chris Lattner public: 521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TargetLowering &TLI; 531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Function &Fn; 541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineFunction &MF; 551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SSARegMap *RegMap; 561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FunctionLoweringInfo(TargetLowering &TLI, Function &Fn,MachineFunction &MF); 581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// MBBMap - A mapping from LLVM basic blocks to their machine code entry. 601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<const BasicBlock*, MachineBasicBlock *> MBBMap; 611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// ValueMap - Since we emit code for the function a basic block at a time, 631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// we must remember which virtual registers hold the values for 641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// cross-basic-block values. 651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<const Value*, unsigned> ValueMap; 661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// StaticAllocaMap - Keep track of frame indices for fixed sized allocas in 681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// the entry block. This allows the allocas to be efficiently referenced 691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// anywhere in the function. 701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<const AllocaInst*, int> StaticAllocaMap; 711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 720afa8e348eab21d3e09ae3240544886d61879266Chris Lattner /// BlockLocalArguments - If any arguments are only used in a single basic 730afa8e348eab21d3e09ae3240544886d61879266Chris Lattner /// block, and if the target can access the arguments without side-effects, 740afa8e348eab21d3e09ae3240544886d61879266Chris Lattner /// avoid emitting CopyToReg nodes for those arguments. This map keeps 750afa8e348eab21d3e09ae3240544886d61879266Chris Lattner /// track of which arguments are local to each BB. 760afa8e348eab21d3e09ae3240544886d61879266Chris Lattner std::multimap<BasicBlock*, std::pair<Argument*, 770afa8e348eab21d3e09ae3240544886d61879266Chris Lattner unsigned> > BlockLocalArguments; 780afa8e348eab21d3e09ae3240544886d61879266Chris Lattner 790afa8e348eab21d3e09ae3240544886d61879266Chris Lattner 801c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned MakeReg(MVT::ValueType VT) { 811c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return RegMap->createVirtualRegister(TLI.getRegClassFor(VT)); 821c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 83edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 841c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned CreateRegForValue(const Value *V) { 851c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType VT = TLI.getValueType(V->getType()); 861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // The common case is that we will only create one register for this 871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // value. If we have that case, create and return the virtual register. 881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned NV = TLI.getNumElements(VT); 89fb849800ea2040c188365c265421ad54fbdcf219Chris Lattner if (NV == 1) { 90fb849800ea2040c188365c265421ad54fbdcf219Chris Lattner // If we are promoting this value, pick the next largest supported type. 9198e5c0e5e4c5be1b531d287d0a1373a62fe562e2Chris Lattner return MakeReg(TLI.getTypeToTransformTo(VT)); 92fb849800ea2040c188365c265421ad54fbdcf219Chris Lattner } 93edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 941c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If this value is represented with multiple target registers, make sure 951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // to create enough consequtive registers of the right (smaller) type. 961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned NT = VT-1; // Find the type to use. 971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner while (TLI.getNumElements((MVT::ValueType)NT) != 1) 981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner --NT; 99edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 1001c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned R = MakeReg((MVT::ValueType)NT); 1011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (unsigned i = 1; i != NV; ++i) 1021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MakeReg((MVT::ValueType)NT); 1031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return R; 1041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 105edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 1061c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned InitializeRegForValue(const Value *V) { 1071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned &R = ValueMap[V]; 1081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(R == 0 && "Already initialized this value register!"); 1091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return R = CreateRegForValue(V); 1101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner }; 1121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 1131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1141c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner/// isUsedOutsideOfDefiningBlock - Return true if this instruction is used by 1151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner/// PHI nodes or outside of the basic block that defines it. 1161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerstatic bool isUsedOutsideOfDefiningBlock(Instruction *I) { 1171c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (isa<PHINode>(I)) return true; 1181c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner BasicBlock *BB = I->getParent(); 1191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (Value::use_iterator UI = I->use_begin(), E = I->use_end(); UI != E; ++UI) 1201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (cast<Instruction>(*UI)->getParent() != BB || isa<PHINode>(*UI)) 1211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return true; 1221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return false; 1231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 1241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris LattnerFunctionLoweringInfo::FunctionLoweringInfo(TargetLowering &tli, 126edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman Function &fn, MachineFunction &mf) 1271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner : TLI(tli), Fn(fn), MF(mf), RegMap(MF.getSSARegMap()) { 1281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Initialize the mapping of values to registers. This is only set up for 1301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // instruction values that are used outside of the block that defines 1311c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // them. 13216ce0df92717cd1474029d87efe596d000dc2caaChris Lattner for (Function::arg_iterator AI = Fn.arg_begin(), E = Fn.arg_end(); 13316ce0df92717cd1474029d87efe596d000dc2caaChris Lattner AI != E; ++AI) 1341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner InitializeRegForValue(AI); 1351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Function::iterator BB = Fn.begin(), E = Fn.end(); 1371c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) 1381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (AllocaInst *AI = dyn_cast<AllocaInst>(I)) 1391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (ConstantUInt *CUI = dyn_cast<ConstantUInt>(AI->getArraySize())) { 1401c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const Type *Ty = AI->getAllocatedType(); 1411c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner uint64_t TySize = TLI.getTargetData().getTypeSize(Ty); 1421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned Align = TLI.getTargetData().getTypeAlignment(Ty); 143a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner 144a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner // If the alignment of the value is smaller than the size of the value, 145a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner // and if the size of the value is particularly small (<= 8 bytes), 146a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner // round up to the size of the value for potentially better performance. 147a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner // 148a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner // FIXME: This could be made better with a preferred alignment hook in 149a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner // TargetData. It serves primarily to 8-byte align doubles for X86. 150a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner if (Align < TySize && TySize <= 8) Align = TySize; 151a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner 1521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TySize *= CUI->getValue(); // Get total allocated size. 1531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner StaticAllocaMap[AI] = 154f26bc8ef4827cf0023a7052b62b920b41813d473Chris Lattner MF.getFrameInfo()->CreateStackObject((unsigned)TySize, Align); 1551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (; BB != E; ++BB) 158f26bc8ef4827cf0023a7052b62b920b41813d473Chris Lattner for (BasicBlock::iterator I = BB->begin(), e = BB->end(); I != e; ++I) 1591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (!I->use_empty() && isUsedOutsideOfDefiningBlock(I)) 1601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (!isa<AllocaInst>(I) || 1611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner !StaticAllocaMap.count(cast<AllocaInst>(I))) 1621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner InitializeRegForValue(I); 1631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Create an initial MachineBasicBlock for each LLVM BasicBlock in F. This 1651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // also creates the initial PHI MachineInstrs, though none of the input 1661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // operands are populated. 1671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (Function::iterator BB = Fn.begin(), E = Fn.end(); BB != E; ++BB) { 1681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock *MBB = new MachineBasicBlock(BB); 1691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MBBMap[BB] = MBB; 1701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MF.getBasicBlockList().push_back(MBB); 1711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Create Machine PHI nodes for LLVM PHI nodes, lowering them as 1731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // appropriate. 1741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner PHINode *PN; 1751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (BasicBlock::iterator I = BB->begin(); 176f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner (PN = dyn_cast<PHINode>(I)); ++I) 177f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner if (!PN->use_empty()) { 178f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner unsigned NumElements = 179f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner TLI.getNumElements(TLI.getValueType(PN->getType())); 180f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner unsigned PHIReg = ValueMap[PN]; 181f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner assert(PHIReg &&"PHI node does not have an assigned virtual register!"); 182f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner for (unsigned i = 0; i != NumElements; ++i) 183f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner BuildMI(MBB, TargetInstrInfo::PHI, PN->getNumOperands(), PHIReg+i); 184f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner } 1851c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 1871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1901c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner//===----------------------------------------------------------------------===// 1911c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner/// SelectionDAGLowering - This is the common target-independent lowering 1921c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner/// implementation that is parameterized by a TargetLowering object. 1931c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner/// Also, targets can overload any lowering method. 1941c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner/// 1951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnernamespace llvm { 1961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerclass SelectionDAGLowering { 1971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock *CurMBB; 1981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1991c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<const Value*, SDOperand> NodeMap; 2001c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 201d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner /// PendingLoads - Loads are not emitted to the program immediately. We bunch 202d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner /// them up and then emit token factor nodes when possible. This allows us to 203d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner /// get simple disambiguation between loads without worrying about alias 204d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner /// analysis. 205d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner std::vector<SDOperand> PendingLoads; 206d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner 2071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerpublic: 2081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // TLI - This is information that describes the available target features we 2091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // need for lowering. This indicates when operations are unavailable, 2101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // implemented with a libcall, etc. 2111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TargetLowering &TLI; 2121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SelectionDAG &DAG; 2131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const TargetData &TD; 2141c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// FuncInfo - Information about the function as a whole. 2161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// 2171c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FunctionLoweringInfo &FuncInfo; 2181c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SelectionDAGLowering(SelectionDAG &dag, TargetLowering &tli, 220edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman FunctionLoweringInfo &funcinfo) 2211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner : TLI(tli), DAG(dag), TD(DAG.getTarget().getTargetData()), 2221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FuncInfo(funcinfo) { 2231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 2241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 225a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner /// getRoot - Return the current virtual root of the Selection DAG. 226a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner /// 227a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner SDOperand getRoot() { 228d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner if (PendingLoads.empty()) 229d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner return DAG.getRoot(); 230edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 231d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner if (PendingLoads.size() == 1) { 232d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner SDOperand Root = PendingLoads[0]; 233d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner DAG.setRoot(Root); 234d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner PendingLoads.clear(); 235d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner return Root; 236d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner } 237d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner 238d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner // Otherwise, we have to make a token factor node. 239d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner SDOperand Root = DAG.getNode(ISD::TokenFactor, MVT::Other, PendingLoads); 240d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner PendingLoads.clear(); 241d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner DAG.setRoot(Root); 242d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner return Root; 243a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner } 244a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner 2451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visit(Instruction &I) { visit(I.getOpcode(), I); } 2461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visit(unsigned Opcode, User &I) { 2481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner switch (Opcode) { 2491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner default: assert(0 && "Unknown instruction type encountered!"); 2501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner abort(); 2511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Build the switch statement using the Instruction.def file. 2521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#define HANDLE_INST(NUM, OPCODE, CLASS) \ 2531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case Instruction::OPCODE:return visit##OPCODE((CLASS&)I); 2541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Instruction.def" 2551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 2561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 2571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void setCurrentBasicBlock(MachineBasicBlock *MBB) { CurMBB = MBB; } 2591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand getIntPtrConstant(uint64_t Val) { 2621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return DAG.getConstant(Val, TLI.getPointerTy()); 2631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 2641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand getValue(const Value *V) { 2661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand &N = NodeMap[V]; 2671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (N.Val) return N; 2681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType VT = TLI.getValueType(V->getType()); 2701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V))) 2711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { 2721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner visit(CE->getOpcode(), *CE); 2731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(N.Val && "visit didn't populate the ValueMap!"); 2741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return N; 2751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else if (GlobalValue *GV = dyn_cast<GlobalValue>(C)) { 2761c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return N = DAG.getGlobalAddress(GV, VT); 2771c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else if (isa<ConstantPointerNull>(C)) { 2781c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return N = DAG.getConstant(0, TLI.getPointerTy()); 2791c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else if (isa<UndefValue>(C)) { 280b882752bd04602249d391699dc7183de007f8964Nate Begeman return N = DAG.getNode(ISD::UNDEF, VT); 2811c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) { 2821c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return N = DAG.getConstantFP(CFP->getValue(), VT); 2831c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else { 2841c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Canonicalize all constant ints to be unsigned. 2851c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return N = DAG.getConstant(cast<ConstantIntegral>(C)->getRawValue(),VT); 2861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 2871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (const AllocaInst *AI = dyn_cast<AllocaInst>(V)) { 2891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<const AllocaInst*, int>::iterator SI = 2901c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FuncInfo.StaticAllocaMap.find(AI); 2911c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (SI != FuncInfo.StaticAllocaMap.end()) 2921c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return DAG.getFrameIndex(SI->second, TLI.getPointerTy()); 2931c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 2941c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<const Value*, unsigned>::const_iterator VMI = 2961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FuncInfo.ValueMap.find(V); 2971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(VMI != FuncInfo.ValueMap.end() && "Value not in map!"); 298c8ea3c47103656a0924909f41651bf5d396c26cdChris Lattner 299d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner unsigned InReg = VMI->second; 300d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner 301d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // If this type is not legal, make it so now. 302d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner MVT::ValueType DestVT = TLI.getTypeToTransformTo(VT); 303d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner 304d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner N = DAG.getCopyFromReg(DAG.getEntryNode(), InReg, DestVT); 305d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner if (DestVT < VT) { 306d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // Source must be expanded. This input value is actually coming from the 307d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // register pair VMI->second and VMI->second+1. 308d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner N = DAG.getNode(ISD::BUILD_PAIR, VT, N, 309d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner DAG.getCopyFromReg(DAG.getEntryNode(), InReg+1, DestVT)); 310d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner } else { 311d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner if (DestVT > VT) { // Promotion case 312d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner if (MVT::isFloatingPoint(VT)) 313d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner N = DAG.getNode(ISD::FP_ROUND, VT, N); 314d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner else 315d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner N = DAG.getNode(ISD::TRUNCATE, VT, N); 316d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner } 317d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner } 318d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner 319d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner return N; 3201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const SDOperand &setValue(const Value *V, SDOperand NewN) { 3231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand &N = NodeMap[V]; 3241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(N.Val == 0 && "Already set a value for this node!"); 3251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return N = NewN; 3261c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Terminator instructions. 3291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitRet(ReturnInst &I); 3301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitBr(BranchInst &I); 3311c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitUnreachable(UnreachableInst &I) { /* noop */ } 3321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // These all get lowered before this pass. 3341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSwitch(SwitchInst &I) { assert(0 && "TODO"); } 3351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitInvoke(InvokeInst &I) { assert(0 && "TODO"); } 3361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitUnwind(UnwindInst &I) { assert(0 && "TODO"); } 3371c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // 3391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitBinary(User &I, unsigned Opcode); 3401c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitAdd(User &I) { visitBinary(I, ISD::ADD); } 341b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner void visitSub(User &I); 3421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitMul(User &I) { visitBinary(I, ISD::MUL); } 3431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitDiv(User &I) { 3441c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner visitBinary(I, I.getType()->isUnsigned() ? ISD::UDIV : ISD::SDIV); 3451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitRem(User &I) { 3471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner visitBinary(I, I.getType()->isUnsigned() ? ISD::UREM : ISD::SREM); 3481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitAnd(User &I) { visitBinary(I, ISD::AND); } 3501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitOr (User &I) { visitBinary(I, ISD::OR); } 3511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitXor(User &I) { visitBinary(I, ISD::XOR); } 3521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitShl(User &I) { visitBinary(I, ISD::SHL); } 3531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitShr(User &I) { 3541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner visitBinary(I, I.getType()->isUnsigned() ? ISD::SRL : ISD::SRA); 3551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetCC(User &I, ISD::CondCode SignedOpc, ISD::CondCode UnsignedOpc); 3581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetEQ(User &I) { visitSetCC(I, ISD::SETEQ, ISD::SETEQ); } 3591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetNE(User &I) { visitSetCC(I, ISD::SETNE, ISD::SETNE); } 3601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetLE(User &I) { visitSetCC(I, ISD::SETLE, ISD::SETULE); } 3611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetGE(User &I) { visitSetCC(I, ISD::SETGE, ISD::SETUGE); } 3621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetLT(User &I) { visitSetCC(I, ISD::SETLT, ISD::SETULT); } 3631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetGT(User &I) { visitSetCC(I, ISD::SETGT, ISD::SETUGT); } 3641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitGetElementPtr(User &I); 3661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitCast(User &I); 3671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSelect(User &I); 3681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // 3691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitMalloc(MallocInst &I); 3711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitFree(FreeInst &I); 3721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitAlloca(AllocaInst &I); 3731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitLoad(LoadInst &I); 3741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitStore(StoreInst &I); 3751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitPHI(PHINode &I) { } // PHI nodes are handled specially. 3761c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitCall(CallInst &I); 3771c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3781c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitVAStart(CallInst &I); 3791c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitVAArg(VAArgInst &I); 3801c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitVAEnd(CallInst &I); 3811c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitVACopy(CallInst &I); 38239ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner void visitFrameReturnAddress(CallInst &I, bool isFrameAddress); 3831c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3847041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner void visitMemIntrinsic(CallInst &I, unsigned Op); 3851c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitUserOp1(Instruction &I) { 3871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(0 && "UserOp1 should not exist at instruction selection time!"); 3881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner abort(); 3891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3901c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitUserOp2(Instruction &I) { 3911c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(0 && "UserOp2 should not exist at instruction selection time!"); 3921c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner abort(); 3931c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3941c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner}; 3951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} // end namespace llvm 3961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitRet(ReturnInst &I) { 3981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (I.getNumOperands() == 0) { 399a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(DAG.getNode(ISD::RET, MVT::Other, getRoot())); 4001c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return; 4011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 4021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Op1 = getValue(I.getOperand(0)); 404f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner MVT::ValueType TmpVT; 405f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner 4061c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner switch (Op1.getValueType()) { 4071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner default: assert(0 && "Unknown value type!"); 4081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::i1: 4091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::i8: 4101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::i16: 411f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner case MVT::i32: 412f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner // If this is a machine where 32-bits is legal or expanded, promote to 413f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner // 32-bits, otherwise, promote to 64-bits. 414f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner if (TLI.getTypeAction(MVT::i32) == TargetLowering::Promote) 415f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner TmpVT = TLI.getTypeToTransformTo(MVT::i32); 416f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner else 417f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner TmpVT = MVT::i32; 418f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner 419f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner // Extend integer types to result type. 4201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (I.getOperand(0)->getType()->isSigned()) 421f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner Op1 = DAG.getNode(ISD::SIGN_EXTEND, TmpVT, Op1); 4221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner else 423f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner Op1 = DAG.getNode(ISD::ZERO_EXTEND, TmpVT, Op1); 4241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner break; 4251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::f32: 4261c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::i64: 4271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::f64: 4281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner break; // No extension needed! 4291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 4301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 431a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(DAG.getNode(ISD::RET, MVT::Other, getRoot(), Op1)); 4321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 4331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitBr(BranchInst &I) { 4351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Update machine-CFG edges. 4361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock *Succ0MBB = FuncInfo.MBBMap[I.getSuccessor(0)]; 4371c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Figure out which block is immediately after the current one. 4391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock *NextBlock = 0; 4401c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineFunction::iterator BBI = CurMBB; 4411c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (++BBI != CurMBB->getParent()->end()) 4421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner NextBlock = BBI; 4431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4441c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (I.isUnconditional()) { 4451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If this is not a fall-through branch, emit the branch. 4461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Succ0MBB != NextBlock) 447a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(DAG.getNode(ISD::BR, MVT::Other, getRoot(), 448dedf2bd5a34dac25e4245f58bb902ced6b64edd9Misha Brukman DAG.getBasicBlock(Succ0MBB))); 4491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else { 4501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock *Succ1MBB = FuncInfo.MBBMap[I.getSuccessor(1)]; 4511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Cond = getValue(I.getCondition()); 4531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Succ1MBB == NextBlock) { 4541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If the condition is false, fall through. This means we should branch 4551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // if the condition is true to Succ #0. 456a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(DAG.getNode(ISD::BRCOND, MVT::Other, getRoot(), 457dedf2bd5a34dac25e4245f58bb902ced6b64edd9Misha Brukman Cond, DAG.getBasicBlock(Succ0MBB))); 4581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else if (Succ0MBB == NextBlock) { 4591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If the condition is true, fall through. This means we should branch if 4601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // the condition is false to Succ #1. Invert the condition first. 4611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand True = DAG.getConstant(1, Cond.getValueType()); 4621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Cond = DAG.getNode(ISD::XOR, Cond.getValueType(), Cond, True); 463a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(DAG.getNode(ISD::BRCOND, MVT::Other, getRoot(), 464dedf2bd5a34dac25e4245f58bb902ced6b64edd9Misha Brukman Cond, DAG.getBasicBlock(Succ1MBB))); 4651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else { 466e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner std::vector<SDOperand> Ops; 467e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner Ops.push_back(getRoot()); 468e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner Ops.push_back(Cond); 469e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner Ops.push_back(DAG.getBasicBlock(Succ0MBB)); 470e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner Ops.push_back(DAG.getBasicBlock(Succ1MBB)); 471e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner DAG.setRoot(DAG.getNode(ISD::BRCONDTWOWAY, MVT::Other, Ops)); 4721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 4731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 4741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 4751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 476b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattnervoid SelectionDAGLowering::visitSub(User &I) { 477b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner // -0.0 - X --> fneg 478b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner if (ConstantFP *CFP = dyn_cast<ConstantFP>(I.getOperand(0))) 479b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner if (CFP->isExactlyValue(-0.0)) { 480b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner SDOperand Op2 = getValue(I.getOperand(1)); 481b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner setValue(&I, DAG.getNode(ISD::FNEG, Op2.getValueType(), Op2)); 482b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner return; 483b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner } 484b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner 485b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner visitBinary(I, ISD::SUB); 486b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner} 487b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner 4881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitBinary(User &I, unsigned Opcode) { 4891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Op1 = getValue(I.getOperand(0)); 4901c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Op2 = getValue(I.getOperand(1)); 4912c49f2795514a7c56b680ba0310d7eb0a8a43289Chris Lattner 4922c49f2795514a7c56b680ba0310d7eb0a8a43289Chris Lattner if (isa<ShiftInst>(I)) 4932c49f2795514a7c56b680ba0310d7eb0a8a43289Chris Lattner Op2 = DAG.getNode(ISD::ZERO_EXTEND, TLI.getShiftAmountTy(), Op2); 4942c49f2795514a7c56b680ba0310d7eb0a8a43289Chris Lattner 4951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner setValue(&I, DAG.getNode(Opcode, Op1.getValueType(), Op1, Op2)); 4961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 4971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitSetCC(User &I,ISD::CondCode SignedOpcode, 4991c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner ISD::CondCode UnsignedOpcode) { 5001c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Op1 = getValue(I.getOperand(0)); 5011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Op2 = getValue(I.getOperand(1)); 5021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner ISD::CondCode Opcode = SignedOpcode; 5031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (I.getOperand(0)->getType()->isUnsigned()) 5041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Opcode = UnsignedOpcode; 5057cf7e3f33f25544d08492d47cc8a1cbba25dc8d7Chris Lattner setValue(&I, DAG.getSetCC(MVT::i1, Op1, Op2, Opcode)); 5061c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 5071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 5081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitSelect(User &I) { 5091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Cond = getValue(I.getOperand(0)); 5101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand TrueVal = getValue(I.getOperand(1)); 5111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand FalseVal = getValue(I.getOperand(2)); 5121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner setValue(&I, DAG.getNode(ISD::SELECT, TrueVal.getValueType(), Cond, 5131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TrueVal, FalseVal)); 5141c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 5151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 5161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitCast(User &I) { 5171c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand N = getValue(I.getOperand(0)); 5181c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType SrcTy = TLI.getValueType(I.getOperand(0)->getType()); 5191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType DestTy = TLI.getValueType(I.getType()); 5201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 5211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (N.getValueType() == DestTy) { 5221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner setValue(&I, N); // noop cast. 523ef311aa7cf26ae0cbb6e784d767801b9058dd24bChris Lattner } else if (DestTy == MVT::i1) { 524ef311aa7cf26ae0cbb6e784d767801b9058dd24bChris Lattner // Cast to bool is a comparison against zero, not truncation to zero. 525ef311aa7cf26ae0cbb6e784d767801b9058dd24bChris Lattner SDOperand Zero = isInteger(SrcTy) ? DAG.getConstant(0, N.getValueType()) : 526ef311aa7cf26ae0cbb6e784d767801b9058dd24bChris Lattner DAG.getConstantFP(0.0, N.getValueType()); 5277cf7e3f33f25544d08492d47cc8a1cbba25dc8d7Chris Lattner setValue(&I, DAG.getSetCC(MVT::i1, N, Zero, ISD::SETNE)); 528ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner } else if (isInteger(SrcTy)) { 529ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (isInteger(DestTy)) { // Int -> Int cast 530ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (DestTy < SrcTy) // Truncating cast? 531ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::TRUNCATE, DestTy, N)); 532ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner else if (I.getOperand(0)->getType()->isSigned()) 533ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::SIGN_EXTEND, DestTy, N)); 534ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner else 535ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::ZERO_EXTEND, DestTy, N)); 536ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner } else { // Int -> FP cast 537ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (I.getOperand(0)->getType()->isSigned()) 538ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::SINT_TO_FP, DestTy, N)); 539ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner else 540ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::UINT_TO_FP, DestTy, N)); 541ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner } 5421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else { 543ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner assert(isFloatingPoint(SrcTy) && "Unknown value type!"); 544ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (isFloatingPoint(DestTy)) { // FP -> FP cast 545ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (DestTy < SrcTy) // Rounding cast? 546ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::FP_ROUND, DestTy, N)); 547ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner else 548ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::FP_EXTEND, DestTy, N)); 549ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner } else { // FP -> Int cast. 550ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (I.getType()->isSigned()) 551ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::FP_TO_SINT, DestTy, N)); 552ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner else 553ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::FP_TO_UINT, DestTy, N)); 554ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner } 5551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 5561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 5571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 5581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitGetElementPtr(User &I) { 5591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand N = getValue(I.getOperand(0)); 5601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const Type *Ty = I.getOperand(0)->getType(); 5611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const Type *UIntPtrTy = TD.getIntPtrType(); 5621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 5631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (GetElementPtrInst::op_iterator OI = I.op_begin()+1, E = I.op_end(); 5641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner OI != E; ++OI) { 5651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Value *Idx = *OI; 5661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (const StructType *StTy = dyn_cast<StructType> (Ty)) { 5671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned Field = cast<ConstantUInt>(Idx)->getValue(); 5681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Field) { 5691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // N = N + Offset 5701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner uint64_t Offset = TD.getStructLayout(StTy)->MemberOffsets[Field]; 5711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner N = DAG.getNode(ISD::ADD, N.getValueType(), N, 572dedf2bd5a34dac25e4245f58bb902ced6b64edd9Misha Brukman getIntPtrConstant(Offset)); 5731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 5741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Ty = StTy->getElementType(Field); 5751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else { 5761c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Ty = cast<SequentialType>(Ty)->getElementType(); 5771c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (!isa<Constant>(Idx) || !cast<Constant>(Idx)->isNullValue()) { 5781c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // N = N + Idx * ElementSize; 5791c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner uint64_t ElementSize = TD.getTypeSize(Ty); 5807cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner SDOperand IdxN = getValue(Idx), Scale = getIntPtrConstant(ElementSize); 5817cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner 5827cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner // If the index is smaller or larger than intptr_t, truncate or extend 5837cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner // it. 5847cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner if (IdxN.getValueType() < Scale.getValueType()) { 5857cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner if (Idx->getType()->isSigned()) 5867cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner IdxN = DAG.getNode(ISD::SIGN_EXTEND, Scale.getValueType(), IdxN); 5877cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner else 5887cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner IdxN = DAG.getNode(ISD::ZERO_EXTEND, Scale.getValueType(), IdxN); 5897cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner } else if (IdxN.getValueType() > Scale.getValueType()) 5907cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner IdxN = DAG.getNode(ISD::TRUNCATE, Scale.getValueType(), IdxN); 5917cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner 5927cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner IdxN = DAG.getNode(ISD::MUL, N.getValueType(), IdxN, Scale); 5931c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner N = DAG.getNode(ISD::ADD, N.getValueType(), N, IdxN); 5941c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 5951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 5961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 5971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner setValue(&I, N); 5981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 5991c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6001c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitAlloca(AllocaInst &I) { 6011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If this is a fixed sized alloca in the entry block of the function, 6021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // allocate it statically on the stack. 6031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (FuncInfo.StaticAllocaMap.count(&I)) 6041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return; // getValue will auto-populate this. 6051c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6061c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const Type *Ty = I.getAllocatedType(); 6071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner uint64_t TySize = TLI.getTargetData().getTypeSize(Ty); 6081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned Align = TLI.getTargetData().getTypeAlignment(Ty); 6091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand AllocSize = getValue(I.getArraySize()); 61168cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner MVT::ValueType IntPtr = TLI.getPointerTy(); 61268cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner if (IntPtr < AllocSize.getValueType()) 61368cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner AllocSize = DAG.getNode(ISD::TRUNCATE, IntPtr, AllocSize); 61468cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner else if (IntPtr > AllocSize.getValueType()) 61568cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner AllocSize = DAG.getNode(ISD::ZERO_EXTEND, IntPtr, AllocSize); 6161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 61768cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner AllocSize = DAG.getNode(ISD::MUL, IntPtr, AllocSize, 6181c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner getIntPtrConstant(TySize)); 6191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Handle alignment. If the requested alignment is less than or equal to the 6211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // stack alignment, ignore it and round the size of the allocation up to the 6221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // stack alignment size. If the size is greater than the stack alignment, we 6231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // note this in the DYNAMIC_STACKALLOC node. 6241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned StackAlign = 6251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TLI.getTargetMachine().getFrameInfo()->getStackAlignment(); 6261c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Align <= StackAlign) { 6271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Align = 0; 6281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Add SA-1 to the size. 6291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner AllocSize = DAG.getNode(ISD::ADD, AllocSize.getValueType(), AllocSize, 6301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner getIntPtrConstant(StackAlign-1)); 6311c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Mask out the low bits for alignment purposes. 6321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner AllocSize = DAG.getNode(ISD::AND, AllocSize.getValueType(), AllocSize, 6331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner getIntPtrConstant(~(uint64_t)(StackAlign-1))); 6341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 6351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 636adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner std::vector<MVT::ValueType> VTs; 637adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner VTs.push_back(AllocSize.getValueType()); 638adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner VTs.push_back(MVT::Other); 639adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner std::vector<SDOperand> Ops; 640adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner Ops.push_back(getRoot()); 641adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner Ops.push_back(AllocSize); 642adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner Ops.push_back(getIntPtrConstant(Align)); 643adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner SDOperand DSA = DAG.getNode(ISD::DYNAMIC_STACKALLOC, VTs, Ops); 6441c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DAG.setRoot(setValue(&I, DSA).getValue(1)); 6451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Inform the Frame Information that we have just allocated a variable-sized 6471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // object. 6481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner CurMBB->getParent()->getFrameInfo()->CreateVariableSizedObject(); 6491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 6501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitLoad(LoadInst &I) { 6531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Ptr = getValue(I.getOperand(0)); 654edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 655d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner SDOperand Root; 656d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner if (I.isVolatile()) 657d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner Root = getRoot(); 658d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner else { 659d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner // Do not serialize non-volatile loads against each other. 660d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner Root = DAG.getRoot(); 661d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner } 662d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner 663369e6db9b6033bb60519b0ad84afeacc9ec9b416Chris Lattner SDOperand L = DAG.getLoad(TLI.getValueType(I.getType()), Root, Ptr, 66406ef88472f7bac3512e224974e87a0a456471b82Andrew Lenharth DAG.getSrcValue(I.getOperand(0))); 665d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner setValue(&I, L); 666d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner 667d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner if (I.isVolatile()) 668d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner DAG.setRoot(L.getValue(1)); 669d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner else 670d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner PendingLoads.push_back(L.getValue(1)); 6711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 6721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitStore(StoreInst &I) { 6751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Value *SrcV = I.getOperand(0); 6761c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Src = getValue(SrcV); 6771c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Ptr = getValue(I.getOperand(1)); 678369e6db9b6033bb60519b0ad84afeacc9ec9b416Chris Lattner DAG.setRoot(DAG.getNode(ISD::STORE, MVT::Other, getRoot(), Src, Ptr, 67906ef88472f7bac3512e224974e87a0a456471b82Andrew Lenharth DAG.getSrcValue(I.getOperand(1)))); 6801c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 6811c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6821c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitCall(CallInst &I) { 68364e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner const char *RenameFn = 0; 684d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner SDOperand Tmp; 6851c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Function *F = I.getCalledFunction()) 686c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner if (F->isExternal()) 687c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner switch (F->getIntrinsicID()) { 688c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case 0: // Not an LLVM intrinsic. 689c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner if (F->getName() == "fabs" || F->getName() == "fabsf") { 690c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner if (I.getNumOperands() == 2 && // Basic sanity checks. 691c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner I.getOperand(1)->getType()->isFloatingPoint() && 692c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner I.getType() == I.getOperand(1)->getType()) { 693d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner Tmp = getValue(I.getOperand(1)); 694c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner setValue(&I, DAG.getNode(ISD::FABS, Tmp.getValueType(), Tmp)); 695c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner return; 696c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner } 697c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner } 698f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner else if (F->getName() == "sin" || F->getName() == "sinf") { 699f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner if (I.getNumOperands() == 2 && // Basic sanity checks. 700f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner I.getOperand(1)->getType()->isFloatingPoint() && 701f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner I.getType() == I.getOperand(1)->getType()) { 702d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner Tmp = getValue(I.getOperand(1)); 703f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner setValue(&I, DAG.getNode(ISD::FSIN, Tmp.getValueType(), Tmp)); 704f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner return; 705f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner } 706f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner } 707f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner else if (F->getName() == "cos" || F->getName() == "cosf") { 708f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner if (I.getNumOperands() == 2 && // Basic sanity checks. 709f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner I.getOperand(1)->getType()->isFloatingPoint() && 710f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner I.getType() == I.getOperand(1)->getType()) { 711d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner Tmp = getValue(I.getOperand(1)); 712f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner setValue(&I, DAG.getNode(ISD::FCOS, Tmp.getValueType(), Tmp)); 713f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner return; 714f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner } 715f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner } 716c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner break; 717c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::vastart: visitVAStart(I); return; 718c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::vaend: visitVAEnd(I); return; 719c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::vacopy: visitVACopy(I); return; 720c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::returnaddress: visitFrameReturnAddress(I, false); return; 721c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::frameaddress: visitFrameReturnAddress(I, true); return; 722d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner 723c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::setjmp: RenameFn = "setjmp"; break; 724c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::longjmp: RenameFn = "longjmp"; break; 725c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::memcpy: visitMemIntrinsic(I, ISD::MEMCPY); return; 726c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::memset: visitMemIntrinsic(I, ISD::MEMSET); return; 727c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::memmove: visitMemIntrinsic(I, ISD::MEMMOVE); return; 728edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 729d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner case Intrinsic::readport: 7301ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner case Intrinsic::readio: { 7311ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner std::vector<MVT::ValueType> VTs; 7321ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner VTs.push_back(TLI.getValueType(I.getType())); 7331ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner VTs.push_back(MVT::Other); 7341ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner std::vector<SDOperand> Ops; 7351ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner Ops.push_back(getRoot()); 7361ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner Ops.push_back(getValue(I.getOperand(1))); 737d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner Tmp = DAG.getNode(F->getIntrinsicID() == Intrinsic::readport ? 7381ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner ISD::READPORT : ISD::READIO, VTs, Ops); 73900b16889ab461b7ecef1c91ade101186b7f1fce2Jeff Cohen 740d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner setValue(&I, Tmp); 741d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner DAG.setRoot(Tmp.getValue(1)); 742d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner return; 7431ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner } 744d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner case Intrinsic::writeport: 745d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner case Intrinsic::writeio: 746d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner DAG.setRoot(DAG.getNode(F->getIntrinsicID() == Intrinsic::writeport ? 747d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner ISD::WRITEPORT : ISD::WRITEIO, MVT::Other, 748d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner getRoot(), getValue(I.getOperand(1)), 749d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner getValue(I.getOperand(2)))); 750d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner return; 7517ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner case Intrinsic::dbg_stoppoint: 7527ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner case Intrinsic::dbg_region_start: 7537ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner case Intrinsic::dbg_region_end: 7547ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner case Intrinsic::dbg_func_start: 7557ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner case Intrinsic::dbg_declare: 7567ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner if (I.getType() != Type::VoidTy) 7577ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner setValue(&I, DAG.getNode(ISD::UNDEF, TLI.getValueType(I.getType()))); 7587ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner return; 7597ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner 760c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::isunordered: 7617cf7e3f33f25544d08492d47cc8a1cbba25dc8d7Chris Lattner setValue(&I, DAG.getSetCC(MVT::i1,getValue(I.getOperand(1)), 7627cf7e3f33f25544d08492d47cc8a1cbba25dc8d7Chris Lattner getValue(I.getOperand(2)), ISD::SETUO)); 763c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner return; 764f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner 765f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner case Intrinsic::sqrt: 766f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner setValue(&I, DAG.getNode(ISD::FSQRT, 767f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner getValue(I.getOperand(1)).getValueType(), 768f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner getValue(I.getOperand(1)))); 769f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner return; 770f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner 771d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner case Intrinsic::pcmarker: 772d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner Tmp = getValue(I.getOperand(1)); 773d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner DAG.setRoot(DAG.getNode(ISD::PCMARKER, MVT::Other, getRoot(), Tmp)); 774c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner return; 775691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth case Intrinsic::cttz: 776691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth setValue(&I, DAG.getNode(ISD::CTTZ, 777691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth getValue(I.getOperand(1)).getValueType(), 778691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth getValue(I.getOperand(1)))); 779691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth return; 780691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth case Intrinsic::ctlz: 781691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth setValue(&I, DAG.getNode(ISD::CTLZ, 782691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth getValue(I.getOperand(1)).getValueType(), 783691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth getValue(I.getOperand(1)))); 784691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth return; 785691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth case Intrinsic::ctpop: 786691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth setValue(&I, DAG.getNode(ISD::CTPOP, 787691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth getValue(I.getOperand(1)).getValueType(), 788691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth getValue(I.getOperand(1)))); 789691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth return; 790d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner default: 791d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner std::cerr << I; 792d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner assert(0 && "This intrinsic is not implemented yet!"); 793d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner return; 794c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner } 795edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 79664e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner SDOperand Callee; 79764e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner if (!RenameFn) 79864e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner Callee = getValue(I.getOperand(0)); 79964e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner else 80064e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner Callee = DAG.getExternalSymbol(RenameFn, TLI.getPointerTy()); 8011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::vector<std::pair<SDOperand, const Type*> > Args; 802edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 8031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (unsigned i = 1, e = I.getNumOperands(); i != e; ++i) { 8041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Value *Arg = I.getOperand(i); 8051c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand ArgNode = getValue(Arg); 8061c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Args.push_back(std::make_pair(ArgNode, Arg->getType())); 8071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 808edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 8098e21e71b248365c69c0f666518c378b5819ce6fbNate Begeman const PointerType *PT = cast<PointerType>(I.getCalledValue()->getType()); 8108e21e71b248365c69c0f666518c378b5819ce6fbNate Begeman const FunctionType *FTy = cast<FunctionType>(PT->getElementType()); 811edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 812cf5734dddd66af9388a171b44996505ede47feedChris Lattner std::pair<SDOperand,SDOperand> Result = 8139092fa310c8b2b1645b0d448c4c34b1e8ddc131dChris Lattner TLI.LowerCallTo(getRoot(), I.getType(), FTy->isVarArg(), I.getCallingConv(), 814adf6a965a321372c640845407195594835921eb4Chris Lattner I.isTailCall(), Callee, Args, DAG); 8151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (I.getType() != Type::VoidTy) 816cf5734dddd66af9388a171b44996505ede47feedChris Lattner setValue(&I, Result.first); 817cf5734dddd66af9388a171b44996505ede47feedChris Lattner DAG.setRoot(Result.second); 8181c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 8191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 8201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitMalloc(MallocInst &I) { 8211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Src = getValue(I.getOperand(0)); 8221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 8231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType IntPtr = TLI.getPointerTy(); 82468cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner 82568cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner if (IntPtr < Src.getValueType()) 82668cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner Src = DAG.getNode(ISD::TRUNCATE, IntPtr, Src); 82768cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner else if (IntPtr > Src.getValueType()) 82868cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner Src = DAG.getNode(ISD::ZERO_EXTEND, IntPtr, Src); 8291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 8301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Scale the source by the type size. 8311c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner uint64_t ElementSize = TD.getTypeSize(I.getType()->getElementType()); 8321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Src = DAG.getNode(ISD::MUL, Src.getValueType(), 8331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Src, getIntPtrConstant(ElementSize)); 8341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 8351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::vector<std::pair<SDOperand, const Type*> > Args; 8361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Args.push_back(std::make_pair(Src, TLI.getTargetData().getIntPtrType())); 837cf5734dddd66af9388a171b44996505ede47feedChris Lattner 838cf5734dddd66af9388a171b44996505ede47feedChris Lattner std::pair<SDOperand,SDOperand> Result = 839adf6a965a321372c640845407195594835921eb4Chris Lattner TLI.LowerCallTo(getRoot(), I.getType(), false, CallingConv::C, true, 840cf5734dddd66af9388a171b44996505ede47feedChris Lattner DAG.getExternalSymbol("malloc", IntPtr), 841cf5734dddd66af9388a171b44996505ede47feedChris Lattner Args, DAG); 842cf5734dddd66af9388a171b44996505ede47feedChris Lattner setValue(&I, Result.first); // Pointers always fit in registers 843cf5734dddd66af9388a171b44996505ede47feedChris Lattner DAG.setRoot(Result.second); 8441c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 8451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 8461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitFree(FreeInst &I) { 8471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::vector<std::pair<SDOperand, const Type*> > Args; 8481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Args.push_back(std::make_pair(getValue(I.getOperand(0)), 8491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TLI.getTargetData().getIntPtrType())); 8501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType IntPtr = TLI.getPointerTy(); 851cf5734dddd66af9388a171b44996505ede47feedChris Lattner std::pair<SDOperand,SDOperand> Result = 852adf6a965a321372c640845407195594835921eb4Chris Lattner TLI.LowerCallTo(getRoot(), Type::VoidTy, false, CallingConv::C, true, 853cf5734dddd66af9388a171b44996505ede47feedChris Lattner DAG.getExternalSymbol("free", IntPtr), Args, DAG); 854cf5734dddd66af9388a171b44996505ede47feedChris Lattner DAG.setRoot(Result.second); 8551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 8561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 857e64e72b794cfa385372436b3c88460aeee0acbf6Chris LattnerSDOperand TargetLowering::LowerVAStart(SDOperand Chain, 858e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SDOperand VAListP, Value *VAListV, 859e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SelectionDAG &DAG) { 8601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // We have no sane default behavior, just emit a useful error message and bail 8611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // out. 86239ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner std::cerr << "Variable arguments handling not implemented on this target!\n"; 8631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner abort(); 864e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner return SDOperand(); 8651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 8661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 867e64e72b794cfa385372436b3c88460aeee0acbf6Chris LattnerSDOperand TargetLowering::LowerVAEnd(SDOperand Chain, SDOperand LP, Value *LV, 86839ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner SelectionDAG &DAG) { 86939ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner // Default to a noop. 87039ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner return Chain; 87139ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner} 87239ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner 873e64e72b794cfa385372436b3c88460aeee0acbf6Chris LattnerSDOperand TargetLowering::LowerVACopy(SDOperand Chain, 874e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SDOperand SrcP, Value *SrcV, 875e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SDOperand DestP, Value *DestV, 876e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SelectionDAG &DAG) { 877e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner // Default to copying the input list. 878e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SDOperand Val = DAG.getLoad(getPointerTy(), Chain, 879e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SrcP, DAG.getSrcValue(SrcV)); 880213e557cef3e653e2d3a00b07b137c143128430aAndrew Lenharth SDOperand Result = DAG.getNode(ISD::STORE, MVT::Other, Val.getValue(1), 881e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner Val, DestP, DAG.getSrcValue(DestV)); 882e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner return Result; 88339ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner} 88439ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner 88539ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattnerstd::pair<SDOperand,SDOperand> 886e64e72b794cfa385372436b3c88460aeee0acbf6Chris LattnerTargetLowering::LowerVAArg(SDOperand Chain, SDOperand VAListP, Value *VAListV, 887e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner const Type *ArgTy, SelectionDAG &DAG) { 8881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // We have no sane default behavior, just emit a useful error message and bail 8891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // out. 89039ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner std::cerr << "Variable arguments handling not implemented on this target!\n"; 8911c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner abort(); 892d3f03e4b50feb6abfa9fec8b0aa705d45134c59eMisha Brukman return std::make_pair(SDOperand(), SDOperand()); 8931c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 89439ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner 89539ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner 89639ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattnervoid SelectionDAGLowering::visitVAStart(CallInst &I) { 897e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner DAG.setRoot(TLI.LowerVAStart(getRoot(), getValue(I.getOperand(1)), 898e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner I.getOperand(1), DAG)); 89939ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner} 90039ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner 9011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitVAArg(VAArgInst &I) { 90239ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner std::pair<SDOperand,SDOperand> Result = 903e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner TLI.LowerVAArg(getRoot(), getValue(I.getOperand(0)), I.getOperand(0), 904558bc88a00930fce283b240b7c9555f649a18f1bAndrew Lenharth I.getType(), DAG); 90539ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner setValue(&I, Result.first); 90639ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner DAG.setRoot(Result.second); 9071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 9081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitVAEnd(CallInst &I) { 91000b16889ab461b7ecef1c91ade101186b7f1fce2Jeff Cohen DAG.setRoot(TLI.LowerVAEnd(getRoot(), getValue(I.getOperand(1)), 911e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner I.getOperand(1), DAG)); 9121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 9131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9141c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitVACopy(CallInst &I) { 915e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SDOperand Result = 916e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner TLI.LowerVACopy(getRoot(), getValue(I.getOperand(2)), I.getOperand(2), 917e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner getValue(I.getOperand(1)), I.getOperand(1), DAG); 918e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner DAG.setRoot(Result); 9191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 9201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 92239ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner// It is always conservatively correct for llvm.returnaddress and 92339ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner// llvm.frameaddress to return 0. 92439ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattnerstd::pair<SDOperand, SDOperand> 92539ae3622791986a0232f7e4797b633f8fa9e54d2Chris LattnerTargetLowering::LowerFrameReturnAddress(bool isFrameAddr, SDOperand Chain, 92639ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner unsigned Depth, SelectionDAG &DAG) { 92739ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner return std::make_pair(DAG.getConstant(0, getPointerTy()), Chain); 9281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 9291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 93050381b6c4180e9a2b983d4623da2e485cd768632Chris LattnerSDOperand TargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) { 931171453a284b097f1ee89fb87ff495c3a6c7b6297Chris Lattner assert(0 && "LowerOperation not implemented for this target!"); 932171453a284b097f1ee89fb87ff495c3a6c7b6297Chris Lattner abort(); 933d3f03e4b50feb6abfa9fec8b0aa705d45134c59eMisha Brukman return SDOperand(); 934171453a284b097f1ee89fb87ff495c3a6c7b6297Chris Lattner} 935171453a284b097f1ee89fb87ff495c3a6c7b6297Chris Lattner 93639ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattnervoid SelectionDAGLowering::visitFrameReturnAddress(CallInst &I, bool isFrame) { 93739ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner unsigned Depth = (unsigned)cast<ConstantUInt>(I.getOperand(1))->getValue(); 93839ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner std::pair<SDOperand,SDOperand> Result = 939a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner TLI.LowerFrameReturnAddress(isFrame, getRoot(), Depth, DAG); 94039ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner setValue(&I, Result.first); 94139ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner DAG.setRoot(Result.second); 94239ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner} 9431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9447041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattnervoid SelectionDAGLowering::visitMemIntrinsic(CallInst &I, unsigned Op) { 9457041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner std::vector<SDOperand> Ops; 946a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner Ops.push_back(getRoot()); 9477041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner Ops.push_back(getValue(I.getOperand(1))); 9487041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner Ops.push_back(getValue(I.getOperand(2))); 9497041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner Ops.push_back(getValue(I.getOperand(3))); 9507041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner Ops.push_back(getValue(I.getOperand(4))); 9517041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner DAG.setRoot(DAG.getNode(Op, MVT::Other, Ops)); 9521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 9531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9547041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner//===----------------------------------------------------------------------===// 9557041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner// SelectionDAGISel code 9567041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner//===----------------------------------------------------------------------===// 9571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerunsigned SelectionDAGISel::MakeReg(MVT::ValueType VT) { 9591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return RegMap->createVirtualRegister(TLI.getRegClassFor(VT)); 9601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 9611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerbool SelectionDAGISel::runOnFunction(Function &Fn) { 9651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineFunction &MF = MachineFunction::construct(&Fn, TLI.getTargetMachine()); 9661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner RegMap = MF.getSSARegMap(); 9671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(std::cerr << "\n\n\n=== " << Fn.getName() << "\n"); 9681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FunctionLoweringInfo FuncInfo(TLI, Fn, MF); 9701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (Function::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I) 9721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SelectBasicBlock(I, MF, FuncInfo); 973edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 9741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return true; 9751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 9761c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9771c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 978ddb870b065984007a0df645ad97c6ad6a6f12de0Chris LattnerSDOperand SelectionDAGISel:: 979ddb870b065984007a0df645ad97c6ad6a6f12de0Chris LattnerCopyValueToVirtualRegister(SelectionDAGLowering &SDL, Value *V, unsigned Reg) { 980f1fdacae8c1bd9e5ff4619546b3a28e93fb75ab5Chris Lattner SDOperand Op = SDL.getValue(V); 98118c2f13e0f9d0e5d6227cf6d1881e9ee3d1b6109Chris Lattner assert((Op.getOpcode() != ISD::CopyFromReg || 982d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner cast<RegisterSDNode>(Op.getOperand(1))->getReg() != Reg) && 98318c2f13e0f9d0e5d6227cf6d1881e9ee3d1b6109Chris Lattner "Copy from a reg to the same reg!"); 984d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner 985d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // If this type is not legal, we must make sure to not create an invalid 986d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // register use. 987d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner MVT::ValueType SrcVT = Op.getValueType(); 988d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner MVT::ValueType DestVT = TLI.getTypeToTransformTo(SrcVT); 989d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner SelectionDAG &DAG = SDL.DAG; 990d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner if (SrcVT == DestVT) { 991d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner return DAG.getCopyToReg(SDL.getRoot(), Reg, Op); 992d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner } else if (SrcVT < DestVT) { 993d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // The src value is promoted to the register. 994fae59b99b8d1942f30a4be609423282c3fd62dd8Chris Lattner if (MVT::isFloatingPoint(SrcVT)) 995fae59b99b8d1942f30a4be609423282c3fd62dd8Chris Lattner Op = DAG.getNode(ISD::FP_EXTEND, DestVT, Op); 996fae59b99b8d1942f30a4be609423282c3fd62dd8Chris Lattner else 997fae59b99b8d1942f30a4be609423282c3fd62dd8Chris Lattner Op = DAG.getNode(ISD::ZERO_EXTEND, DestVT, Op); 998d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner return DAG.getCopyToReg(SDL.getRoot(), Reg, Op); 999d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner } else { 1000d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // The src value is expanded into multiple registers. 1001d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, DestVT, 1002d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner Op, DAG.getConstant(0, MVT::i32)); 1003d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, DestVT, 1004d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner Op, DAG.getConstant(1, MVT::i32)); 1005d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner Op = DAG.getCopyToReg(SDL.getRoot(), Reg, Lo); 1006d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner return DAG.getCopyToReg(Op, Reg+1, Hi); 1007d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner } 10081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 10091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 10100afa8e348eab21d3e09ae3240544886d61879266Chris Lattner/// IsOnlyUsedInOneBasicBlock - If the specified argument is only used in a 10110afa8e348eab21d3e09ae3240544886d61879266Chris Lattner/// single basic block, return that block. Otherwise, return a null pointer. 10120afa8e348eab21d3e09ae3240544886d61879266Chris Lattnerstatic BasicBlock *IsOnlyUsedInOneBasicBlock(Argument *A) { 10130afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (A->use_empty()) return 0; 10140afa8e348eab21d3e09ae3240544886d61879266Chris Lattner BasicBlock *BB = cast<Instruction>(A->use_back())->getParent(); 10150afa8e348eab21d3e09ae3240544886d61879266Chris Lattner for (Argument::use_iterator UI = A->use_begin(), E = A->use_end(); UI != E; 10160afa8e348eab21d3e09ae3240544886d61879266Chris Lattner ++UI) 10170afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (isa<PHINode>(*UI) || cast<Instruction>(*UI)->getParent() != BB) 10180afa8e348eab21d3e09ae3240544886d61879266Chris Lattner return 0; // Disagreement among the users? 1019aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner 1020aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner // Okay, there is a single BB user. Only permit this optimization if this is 1021aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner // the entry block, otherwise, we might sink argument loads into loops and 1022aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner // stuff. Later, when we have global instruction selection, this won't be an 1023aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner // issue clearly. 1024aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner if (BB == BB->getParent()->begin()) 1025aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner return BB; 1026aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner return 0; 10270afa8e348eab21d3e09ae3240544886d61879266Chris Lattner} 10280afa8e348eab21d3e09ae3240544886d61879266Chris Lattner 1029068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattnervoid SelectionDAGISel:: 1030068a81e9fca511b9a3b3a0f28a8988a57f994652Chris LattnerLowerArguments(BasicBlock *BB, SelectionDAGLowering &SDL, 1031068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner std::vector<SDOperand> &UnorderedChains) { 10321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If this is the entry block, emit arguments. 1033068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner Function &F = *BB->getParent(); 10340afa8e348eab21d3e09ae3240544886d61879266Chris Lattner FunctionLoweringInfo &FuncInfo = SDL.FuncInfo; 1035068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner 1036068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner if (BB == &F.front()) { 10370afa8e348eab21d3e09ae3240544886d61879266Chris Lattner SDOperand OldRoot = SDL.DAG.getRoot(); 10380afa8e348eab21d3e09ae3240544886d61879266Chris Lattner 1039068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner std::vector<SDOperand> Args = TLI.LowerArguments(F, SDL.DAG); 1040068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner 10410afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // If there were side effects accessing the argument list, do not do 10420afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // anything special. 10430afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (OldRoot != SDL.DAG.getRoot()) { 10440afa8e348eab21d3e09ae3240544886d61879266Chris Lattner unsigned a = 0; 1045a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner for (Function::arg_iterator AI = F.arg_begin(), E = F.arg_end(); 1046a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner AI != E; ++AI,++a) 10470afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (!AI->use_empty()) { 10480afa8e348eab21d3e09ae3240544886d61879266Chris Lattner SDL.setValue(AI, Args[a]); 1049edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman SDOperand Copy = 10500afa8e348eab21d3e09ae3240544886d61879266Chris Lattner CopyValueToVirtualRegister(SDL, AI, FuncInfo.ValueMap[AI]); 10510afa8e348eab21d3e09ae3240544886d61879266Chris Lattner UnorderedChains.push_back(Copy); 10520afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } 10530afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } else { 10540afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // Otherwise, if any argument is only accessed in a single basic block, 10550afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // emit that argument only to that basic block. 10560afa8e348eab21d3e09ae3240544886d61879266Chris Lattner unsigned a = 0; 1057a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner for (Function::arg_iterator AI = F.arg_begin(), E = F.arg_end(); 1058a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner AI != E; ++AI,++a) 10590afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (!AI->use_empty()) { 10600afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (BasicBlock *BBU = IsOnlyUsedInOneBasicBlock(AI)) { 10610afa8e348eab21d3e09ae3240544886d61879266Chris Lattner FuncInfo.BlockLocalArguments.insert(std::make_pair(BBU, 10620afa8e348eab21d3e09ae3240544886d61879266Chris Lattner std::make_pair(AI, a))); 10630afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } else { 10640afa8e348eab21d3e09ae3240544886d61879266Chris Lattner SDL.setValue(AI, Args[a]); 1065edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman SDOperand Copy = 10660afa8e348eab21d3e09ae3240544886d61879266Chris Lattner CopyValueToVirtualRegister(SDL, AI, FuncInfo.ValueMap[AI]); 10670afa8e348eab21d3e09ae3240544886d61879266Chris Lattner UnorderedChains.push_back(Copy); 10680afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } 10690afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } 10700afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } 1071405ef9e28d955c1b107c27bedfd4be8b9165af01Chris Lattner 1072405ef9e28d955c1b107c27bedfd4be8b9165af01Chris Lattner EmitFunctionEntryCode(F, SDL.DAG.getMachineFunction()); 10730afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } 10741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 10750afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // See if there are any block-local arguments that need to be emitted in this 10760afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // block. 10770afa8e348eab21d3e09ae3240544886d61879266Chris Lattner 10780afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (!FuncInfo.BlockLocalArguments.empty()) { 10790afa8e348eab21d3e09ae3240544886d61879266Chris Lattner std::multimap<BasicBlock*, std::pair<Argument*, unsigned> >::iterator BLAI = 10800afa8e348eab21d3e09ae3240544886d61879266Chris Lattner FuncInfo.BlockLocalArguments.lower_bound(BB); 10810afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (BLAI != FuncInfo.BlockLocalArguments.end() && BLAI->first == BB) { 10820afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // Lower the arguments into this block. 10830afa8e348eab21d3e09ae3240544886d61879266Chris Lattner std::vector<SDOperand> Args = TLI.LowerArguments(F, SDL.DAG); 1084edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 10850afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // Set up the value mapping for the local arguments. 10860afa8e348eab21d3e09ae3240544886d61879266Chris Lattner for (; BLAI != FuncInfo.BlockLocalArguments.end() && BLAI->first == BB; 10870afa8e348eab21d3e09ae3240544886d61879266Chris Lattner ++BLAI) 10880afa8e348eab21d3e09ae3240544886d61879266Chris Lattner SDL.setValue(BLAI->second.first, Args[BLAI->second.second]); 1089edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 10900afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // Any dead arguments will just be ignored here. 10910afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } 10921c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1093068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner} 1094068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner 1095068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner 1096068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattnervoid SelectionDAGISel::BuildSelectionDAG(SelectionDAG &DAG, BasicBlock *LLVMBB, 1097068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner std::vector<std::pair<MachineInstr*, unsigned> > &PHINodesToUpdate, 1098068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner FunctionLoweringInfo &FuncInfo) { 1099068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner SelectionDAGLowering SDL(DAG, TLI, FuncInfo); 1100068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner 1101068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner std::vector<SDOperand> UnorderedChains; 1102edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 1103068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner // Lower any arguments needed in this block. 1104068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner LowerArguments(LLVMBB, SDL, UnorderedChains); 11051c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11061c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner BB = FuncInfo.MBBMap[LLVMBB]; 11071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDL.setCurrentBasicBlock(BB); 11081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Lower all of the non-terminator instructions. 11101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (BasicBlock::iterator I = LLVMBB->begin(), E = --LLVMBB->end(); 11111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner I != E; ++I) 11121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDL.visit(*I); 11131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11141c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Ensure that all instructions which are used outside of their defining 11151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // blocks are available as virtual registers. 11161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (BasicBlock::iterator I = LLVMBB->begin(), E = LLVMBB->end(); I != E;++I) 1117f1fdacae8c1bd9e5ff4619546b3a28e93fb75ab5Chris Lattner if (!I->use_empty() && !isa<PHINode>(I)) { 1118ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner std::map<const Value*, unsigned>::iterator VMI =FuncInfo.ValueMap.find(I); 11191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (VMI != FuncInfo.ValueMap.end()) 1120ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner UnorderedChains.push_back( 1121ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner CopyValueToVirtualRegister(SDL, I, VMI->second)); 11221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 11231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Handle PHI nodes in successor blocks. Emit code into the SelectionDAG to 11251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // ensure constants are generated when needed. Remember the virtual registers 11261c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // that need to be added to the Machine PHI nodes as input. We cannot just 11271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // directly add them, because expansion might result in multiple MBB's for one 11281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // BB. As such, the start of the BB might correspond to a different MBB than 11291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // the end. 1130edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman // 11311c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Emit constants only once even if used by multiple PHI nodes. 11331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<Constant*, unsigned> ConstantsOut; 11341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Check successor nodes PHI nodes that expect a constant to be available from 11361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // this block. 11371c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TerminatorInst *TI = LLVMBB->getTerminator(); 11381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (unsigned succ = 0, e = TI->getNumSuccessors(); succ != e; ++succ) { 11391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner BasicBlock *SuccBB = TI->getSuccessor(succ); 11401c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock::iterator MBBI = FuncInfo.MBBMap[SuccBB]->begin(); 11411c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner PHINode *PN; 11421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // At this point we know that there is a 1-1 correspondence between LLVM PHI 11441c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // nodes and Machine PHI nodes, but the incoming operands have not been 11451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // emitted yet. 11461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (BasicBlock::iterator I = SuccBB->begin(); 1147f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner (PN = dyn_cast<PHINode>(I)); ++I) 1148f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner if (!PN->use_empty()) { 1149f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner unsigned Reg; 1150f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner Value *PHIOp = PN->getIncomingValueForBlock(LLVMBB); 1151f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner if (Constant *C = dyn_cast<Constant>(PHIOp)) { 1152f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner unsigned &RegOut = ConstantsOut[C]; 1153f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner if (RegOut == 0) { 1154f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner RegOut = FuncInfo.CreateRegForValue(C); 1155ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner UnorderedChains.push_back( 1156ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner CopyValueToVirtualRegister(SDL, C, RegOut)); 1157f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner } 1158f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner Reg = RegOut; 1159f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner } else { 1160f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner Reg = FuncInfo.ValueMap[PHIOp]; 1161ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner if (Reg == 0) { 1162edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman assert(isa<AllocaInst>(PHIOp) && 1163ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner FuncInfo.StaticAllocaMap.count(cast<AllocaInst>(PHIOp)) && 1164ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner "Didn't codegen value into a register!??"); 1165ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner Reg = FuncInfo.CreateRegForValue(PHIOp); 1166ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner UnorderedChains.push_back( 1167ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner CopyValueToVirtualRegister(SDL, PHIOp, Reg)); 1168ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner } 11691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1170edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 1171f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner // Remember that this register needs to added to the machine PHI node as 1172f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner // the input for this MBB. 1173f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner unsigned NumElements = 1174f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner TLI.getNumElements(TLI.getValueType(PN->getType())); 1175f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner for (unsigned i = 0, e = NumElements; i != e; ++i) 1176f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner PHINodesToUpdate.push_back(std::make_pair(MBBI++, Reg+i)); 11771c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 11781c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 11791c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner ConstantsOut.clear(); 11801c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1181ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner // Turn all of the unordered chains into one factored node. 11825a6c6d98d561df671350a56c8031a3611f1c46faChris Lattner if (!UnorderedChains.empty()) { 1183d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner UnorderedChains.push_back(SDL.getRoot()); 1184ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other, UnorderedChains)); 1185ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner } 1186ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner 11871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Lower the terminator after the copies are emitted. 11881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDL.visit(*LLVMBB->getTerminator()); 1189a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner 1190a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner // Make sure the root of the DAG is up-to-date. 1191a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(SDL.getRoot()); 11921c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 11931c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11941c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGISel::SelectBasicBlock(BasicBlock *LLVMBB, MachineFunction &MF, 11951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FunctionLoweringInfo &FuncInfo) { 1196ac9dc08c7f0ae60c125624d72c3022025d79ee9eChris Lattner SelectionDAG DAG(TLI, MF); 11971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner CurDAG = &DAG; 11981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::vector<std::pair<MachineInstr*, unsigned> > PHINodesToUpdate; 11991c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 12001c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // First step, lower LLVM code to some DAG. This DAG may use operations and 12011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // types that are not supported by the target. 12021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner BuildSelectionDAG(DAG, LLVMBB, PHINodesToUpdate, FuncInfo); 12031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 12041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(std::cerr << "Lowered selection DAG:\n"); 12051c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(DAG.dump()); 12061c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 12071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Second step, hack on the DAG until it only uses operations and types that 12081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // the target supports. 1209ac9dc08c7f0ae60c125624d72c3022025d79ee9eChris Lattner DAG.Legalize(); 12101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 12111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(std::cerr << "Legalized selection DAG:\n"); 12121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(DAG.dump()); 12131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1214a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // Third, instruction select all of the operations to machine code, adding the 1215a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // code to the MachineBasicBlock. 12161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner InstructionSelectBasicBlock(DAG); 12171c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 12187944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner if (ViewDAGs) DAG.viewGraph(); 12197944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner 12201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(std::cerr << "Selected machine code:\n"); 12211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(BB->dump()); 12221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1223a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // Next, now that we know what the last MBB the LLVM BB expanded is, update 12241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // PHI nodes in successors. 12251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (unsigned i = 0, e = PHINodesToUpdate.size(); i != e; ++i) { 12261c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineInstr *PHI = PHINodesToUpdate[i].first; 12271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(PHI->getOpcode() == TargetInstrInfo::PHI && 12281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner "This is not a machine PHI node that we are updating!"); 12291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner PHI->addRegOperand(PHINodesToUpdate[i].second); 12301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner PHI->addMachineBasicBlockOperand(BB); 12311c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1232a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner 1233a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // Finally, add the CFG edges from the last selected MBB to the successor 1234a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // MBBs. 1235a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner TerminatorInst *TI = LLVMBB->getTerminator(); 1236a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner for (unsigned i = 0, e = TI->getNumSuccessors(); i != e; ++i) { 1237a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner MachineBasicBlock *Succ0MBB = FuncInfo.MBBMap[TI->getSuccessor(i)]; 1238a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner BB->addSuccessor(Succ0MBB); 1239a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner } 12401c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 1241