SelectionDAGISel.cpp revision 06ef88472f7bac3512e224974e87a0a456471b82
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 299ef5cd1d3cf7d0b20987a545fcd2d0af2bfe6c422Chris Lattner return N = DAG.getCopyFromReg(VMI->second, VT, DAG.getEntryNode()); 3001c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const SDOperand &setValue(const Value *V, SDOperand NewN) { 3031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand &N = NodeMap[V]; 3041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(N.Val == 0 && "Already set a value for this node!"); 3051c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return N = NewN; 3061c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Terminator instructions. 3091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitRet(ReturnInst &I); 3101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitBr(BranchInst &I); 3111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitUnreachable(UnreachableInst &I) { /* noop */ } 3121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // These all get lowered before this pass. 3141c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSwitch(SwitchInst &I) { assert(0 && "TODO"); } 3151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitInvoke(InvokeInst &I) { assert(0 && "TODO"); } 3161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitUnwind(UnwindInst &I) { assert(0 && "TODO"); } 3171c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3181c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // 3191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitBinary(User &I, unsigned Opcode); 3201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitAdd(User &I) { visitBinary(I, ISD::ADD); } 321b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner void visitSub(User &I); 3221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitMul(User &I) { visitBinary(I, ISD::MUL); } 3231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitDiv(User &I) { 3241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner visitBinary(I, I.getType()->isUnsigned() ? ISD::UDIV : ISD::SDIV); 3251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3261c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitRem(User &I) { 3271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner visitBinary(I, I.getType()->isUnsigned() ? ISD::UREM : ISD::SREM); 3281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitAnd(User &I) { visitBinary(I, ISD::AND); } 3301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitOr (User &I) { visitBinary(I, ISD::OR); } 3311c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitXor(User &I) { visitBinary(I, ISD::XOR); } 3321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitShl(User &I) { visitBinary(I, ISD::SHL); } 3331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitShr(User &I) { 3341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner visitBinary(I, I.getType()->isUnsigned() ? ISD::SRL : ISD::SRA); 3351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3371c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetCC(User &I, ISD::CondCode SignedOpc, ISD::CondCode UnsignedOpc); 3381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetEQ(User &I) { visitSetCC(I, ISD::SETEQ, ISD::SETEQ); } 3391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetNE(User &I) { visitSetCC(I, ISD::SETNE, ISD::SETNE); } 3401c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetLE(User &I) { visitSetCC(I, ISD::SETLE, ISD::SETULE); } 3411c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetGE(User &I) { visitSetCC(I, ISD::SETGE, ISD::SETUGE); } 3421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetLT(User &I) { visitSetCC(I, ISD::SETLT, ISD::SETULT); } 3431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetGT(User &I) { visitSetCC(I, ISD::SETGT, ISD::SETUGT); } 3441c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitGetElementPtr(User &I); 3461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitCast(User &I); 3471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSelect(User &I); 3481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // 3491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitMalloc(MallocInst &I); 3511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitFree(FreeInst &I); 3521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitAlloca(AllocaInst &I); 3531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitLoad(LoadInst &I); 3541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitStore(StoreInst &I); 3551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitPHI(PHINode &I) { } // PHI nodes are handled specially. 3561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitCall(CallInst &I); 3571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitVAStart(CallInst &I); 3591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitVAArg(VAArgInst &I); 3601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitVAEnd(CallInst &I); 3611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitVACopy(CallInst &I); 36239ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner void visitFrameReturnAddress(CallInst &I, bool isFrameAddress); 3631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3647041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner void visitMemIntrinsic(CallInst &I, unsigned Op); 3651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitUserOp1(Instruction &I) { 3671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(0 && "UserOp1 should not exist at instruction selection time!"); 3681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner abort(); 3691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitUserOp2(Instruction &I) { 3711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(0 && "UserOp2 should not exist at instruction selection time!"); 3721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner abort(); 3731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner}; 3751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} // end namespace llvm 3761c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3771c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitRet(ReturnInst &I) { 3781c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (I.getNumOperands() == 0) { 379a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(DAG.getNode(ISD::RET, MVT::Other, getRoot())); 3801c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return; 3811c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3821c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3831c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Op1 = getValue(I.getOperand(0)); 384f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner MVT::ValueType TmpVT; 385f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner 3861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner switch (Op1.getValueType()) { 3871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner default: assert(0 && "Unknown value type!"); 3881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::i1: 3891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::i8: 3901c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::i16: 391f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner case MVT::i32: 392f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner // If this is a machine where 32-bits is legal or expanded, promote to 393f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner // 32-bits, otherwise, promote to 64-bits. 394f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner if (TLI.getTypeAction(MVT::i32) == TargetLowering::Promote) 395f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner TmpVT = TLI.getTypeToTransformTo(MVT::i32); 396f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner else 397f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner TmpVT = MVT::i32; 398f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner 399f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner // Extend integer types to result type. 4001c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (I.getOperand(0)->getType()->isSigned()) 401f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner Op1 = DAG.getNode(ISD::SIGN_EXTEND, TmpVT, Op1); 4021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner else 403f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner Op1 = DAG.getNode(ISD::ZERO_EXTEND, TmpVT, Op1); 4041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner break; 4051c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::f32: 4061c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Extend float to double. 4071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Op1 = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Op1); 4081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner break; 4091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::i64: 4101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::f64: 4111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner break; // No extension needed! 4121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 4131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 414a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(DAG.getNode(ISD::RET, MVT::Other, getRoot(), Op1)); 4151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 4161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4171c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitBr(BranchInst &I) { 4181c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Update machine-CFG edges. 4191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock *Succ0MBB = FuncInfo.MBBMap[I.getSuccessor(0)]; 4201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Figure out which block is immediately after the current one. 4221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock *NextBlock = 0; 4231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineFunction::iterator BBI = CurMBB; 4241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (++BBI != CurMBB->getParent()->end()) 4251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner NextBlock = BBI; 4261c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (I.isUnconditional()) { 4281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If this is not a fall-through branch, emit the branch. 4291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Succ0MBB != NextBlock) 430a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(DAG.getNode(ISD::BR, MVT::Other, getRoot(), 431dedf2bd5a34dac25e4245f58bb902ced6b64edd9Misha Brukman DAG.getBasicBlock(Succ0MBB))); 4321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else { 4331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock *Succ1MBB = FuncInfo.MBBMap[I.getSuccessor(1)]; 4341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Cond = getValue(I.getCondition()); 4361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Succ1MBB == NextBlock) { 4371c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If the condition is false, fall through. This means we should branch 4381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // if the condition is true to Succ #0. 439a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(DAG.getNode(ISD::BRCOND, MVT::Other, getRoot(), 440dedf2bd5a34dac25e4245f58bb902ced6b64edd9Misha Brukman Cond, DAG.getBasicBlock(Succ0MBB))); 4411c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else if (Succ0MBB == NextBlock) { 4421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If the condition is true, fall through. This means we should branch if 4431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // the condition is false to Succ #1. Invert the condition first. 4441c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand True = DAG.getConstant(1, Cond.getValueType()); 4451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Cond = DAG.getNode(ISD::XOR, Cond.getValueType(), Cond, True); 446a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(DAG.getNode(ISD::BRCOND, MVT::Other, getRoot(), 447dedf2bd5a34dac25e4245f58bb902ced6b64edd9Misha Brukman Cond, DAG.getBasicBlock(Succ1MBB))); 4481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else { 449e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner std::vector<SDOperand> Ops; 450e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner Ops.push_back(getRoot()); 451e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner Ops.push_back(Cond); 452e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner Ops.push_back(DAG.getBasicBlock(Succ0MBB)); 453e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner Ops.push_back(DAG.getBasicBlock(Succ1MBB)); 454e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner DAG.setRoot(DAG.getNode(ISD::BRCONDTWOWAY, MVT::Other, Ops)); 4551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 4561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 4571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 4581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 459b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattnervoid SelectionDAGLowering::visitSub(User &I) { 460b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner // -0.0 - X --> fneg 461b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner if (ConstantFP *CFP = dyn_cast<ConstantFP>(I.getOperand(0))) 462b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner if (CFP->isExactlyValue(-0.0)) { 463b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner SDOperand Op2 = getValue(I.getOperand(1)); 464b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner setValue(&I, DAG.getNode(ISD::FNEG, Op2.getValueType(), Op2)); 465b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner return; 466b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner } 467b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner 468b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner visitBinary(I, ISD::SUB); 469b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner} 470b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner 4711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitBinary(User &I, unsigned Opcode) { 4721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Op1 = getValue(I.getOperand(0)); 4731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Op2 = getValue(I.getOperand(1)); 4742c49f2795514a7c56b680ba0310d7eb0a8a43289Chris Lattner 4752c49f2795514a7c56b680ba0310d7eb0a8a43289Chris Lattner if (isa<ShiftInst>(I)) 4762c49f2795514a7c56b680ba0310d7eb0a8a43289Chris Lattner Op2 = DAG.getNode(ISD::ZERO_EXTEND, TLI.getShiftAmountTy(), Op2); 4772c49f2795514a7c56b680ba0310d7eb0a8a43289Chris Lattner 4781c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner setValue(&I, DAG.getNode(Opcode, Op1.getValueType(), Op1, Op2)); 4791c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 4801c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4811c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitSetCC(User &I,ISD::CondCode SignedOpcode, 4821c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner ISD::CondCode UnsignedOpcode) { 4831c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Op1 = getValue(I.getOperand(0)); 4841c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Op2 = getValue(I.getOperand(1)); 4851c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner ISD::CondCode Opcode = SignedOpcode; 4861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (I.getOperand(0)->getType()->isUnsigned()) 4871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Opcode = UnsignedOpcode; 488f30b73b1c6b6ca8453dc61eb3777b4e4414d3839Chris Lattner setValue(&I, DAG.getSetCC(Opcode, MVT::i1, Op1, Op2)); 4891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 4901c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4911c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitSelect(User &I) { 4921c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Cond = getValue(I.getOperand(0)); 4931c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand TrueVal = getValue(I.getOperand(1)); 4941c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand FalseVal = getValue(I.getOperand(2)); 4951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner setValue(&I, DAG.getNode(ISD::SELECT, TrueVal.getValueType(), Cond, 4961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TrueVal, FalseVal)); 4971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 4981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4991c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitCast(User &I) { 5001c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand N = getValue(I.getOperand(0)); 5011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType SrcTy = TLI.getValueType(I.getOperand(0)->getType()); 5021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType DestTy = TLI.getValueType(I.getType()); 5031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 5041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (N.getValueType() == DestTy) { 5051c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner setValue(&I, N); // noop cast. 506ef311aa7cf26ae0cbb6e784d767801b9058dd24bChris Lattner } else if (DestTy == MVT::i1) { 507ef311aa7cf26ae0cbb6e784d767801b9058dd24bChris Lattner // Cast to bool is a comparison against zero, not truncation to zero. 508ef311aa7cf26ae0cbb6e784d767801b9058dd24bChris Lattner SDOperand Zero = isInteger(SrcTy) ? DAG.getConstant(0, N.getValueType()) : 509ef311aa7cf26ae0cbb6e784d767801b9058dd24bChris Lattner DAG.getConstantFP(0.0, N.getValueType()); 510ef311aa7cf26ae0cbb6e784d767801b9058dd24bChris Lattner setValue(&I, DAG.getSetCC(ISD::SETNE, MVT::i1, N, Zero)); 511ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner } else if (isInteger(SrcTy)) { 512ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (isInteger(DestTy)) { // Int -> Int cast 513ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (DestTy < SrcTy) // Truncating cast? 514ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::TRUNCATE, DestTy, N)); 515ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner else if (I.getOperand(0)->getType()->isSigned()) 516ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::SIGN_EXTEND, DestTy, N)); 517ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner else 518ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::ZERO_EXTEND, DestTy, N)); 519ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner } else { // Int -> FP cast 520ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (I.getOperand(0)->getType()->isSigned()) 521ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::SINT_TO_FP, DestTy, N)); 522ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner else 523ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::UINT_TO_FP, DestTy, N)); 524ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner } 5251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else { 526ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner assert(isFloatingPoint(SrcTy) && "Unknown value type!"); 527ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (isFloatingPoint(DestTy)) { // FP -> FP cast 528ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (DestTy < SrcTy) // Rounding cast? 529ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::FP_ROUND, DestTy, N)); 530ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner else 531ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::FP_EXTEND, DestTy, N)); 532ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner } else { // FP -> Int cast. 533ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (I.getType()->isSigned()) 534ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::FP_TO_SINT, DestTy, N)); 535ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner else 536ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::FP_TO_UINT, DestTy, N)); 537ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner } 5381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 5391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 5401c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 5411c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitGetElementPtr(User &I) { 5421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand N = getValue(I.getOperand(0)); 5431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const Type *Ty = I.getOperand(0)->getType(); 5441c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const Type *UIntPtrTy = TD.getIntPtrType(); 5451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 5461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (GetElementPtrInst::op_iterator OI = I.op_begin()+1, E = I.op_end(); 5471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner OI != E; ++OI) { 5481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Value *Idx = *OI; 5491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (const StructType *StTy = dyn_cast<StructType> (Ty)) { 5501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned Field = cast<ConstantUInt>(Idx)->getValue(); 5511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Field) { 5521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // N = N + Offset 5531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner uint64_t Offset = TD.getStructLayout(StTy)->MemberOffsets[Field]; 5541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner N = DAG.getNode(ISD::ADD, N.getValueType(), N, 555dedf2bd5a34dac25e4245f58bb902ced6b64edd9Misha Brukman getIntPtrConstant(Offset)); 5561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 5571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Ty = StTy->getElementType(Field); 5581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else { 5591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Ty = cast<SequentialType>(Ty)->getElementType(); 5601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (!isa<Constant>(Idx) || !cast<Constant>(Idx)->isNullValue()) { 5611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // N = N + Idx * ElementSize; 5621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner uint64_t ElementSize = TD.getTypeSize(Ty); 5637cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner SDOperand IdxN = getValue(Idx), Scale = getIntPtrConstant(ElementSize); 5647cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner 5657cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner // If the index is smaller or larger than intptr_t, truncate or extend 5667cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner // it. 5677cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner if (IdxN.getValueType() < Scale.getValueType()) { 5687cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner if (Idx->getType()->isSigned()) 5697cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner IdxN = DAG.getNode(ISD::SIGN_EXTEND, Scale.getValueType(), IdxN); 5707cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner else 5717cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner IdxN = DAG.getNode(ISD::ZERO_EXTEND, Scale.getValueType(), IdxN); 5727cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner } else if (IdxN.getValueType() > Scale.getValueType()) 5737cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner IdxN = DAG.getNode(ISD::TRUNCATE, Scale.getValueType(), IdxN); 5747cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner 5757cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner IdxN = DAG.getNode(ISD::MUL, N.getValueType(), IdxN, Scale); 5761c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner N = DAG.getNode(ISD::ADD, N.getValueType(), N, IdxN); 5771c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 5781c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 5791c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 5801c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner setValue(&I, N); 5811c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 5821c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 5831c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitAlloca(AllocaInst &I) { 5841c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If this is a fixed sized alloca in the entry block of the function, 5851c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // allocate it statically on the stack. 5861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (FuncInfo.StaticAllocaMap.count(&I)) 5871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return; // getValue will auto-populate this. 5881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 5891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const Type *Ty = I.getAllocatedType(); 5901c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner uint64_t TySize = TLI.getTargetData().getTypeSize(Ty); 5911c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned Align = TLI.getTargetData().getTypeAlignment(Ty); 5921c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 5931c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand AllocSize = getValue(I.getArraySize()); 59468cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner MVT::ValueType IntPtr = TLI.getPointerTy(); 59568cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner if (IntPtr < AllocSize.getValueType()) 59668cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner AllocSize = DAG.getNode(ISD::TRUNCATE, IntPtr, AllocSize); 59768cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner else if (IntPtr > AllocSize.getValueType()) 59868cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner AllocSize = DAG.getNode(ISD::ZERO_EXTEND, IntPtr, AllocSize); 5991c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 60068cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner AllocSize = DAG.getNode(ISD::MUL, IntPtr, AllocSize, 6011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner getIntPtrConstant(TySize)); 6021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Handle alignment. If the requested alignment is less than or equal to the 6041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // stack alignment, ignore it and round the size of the allocation up to the 6051c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // stack alignment size. If the size is greater than the stack alignment, we 6061c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // note this in the DYNAMIC_STACKALLOC node. 6071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned StackAlign = 6081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TLI.getTargetMachine().getFrameInfo()->getStackAlignment(); 6091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Align <= StackAlign) { 6101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Align = 0; 6111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Add SA-1 to the size. 6121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner AllocSize = DAG.getNode(ISD::ADD, AllocSize.getValueType(), AllocSize, 6131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner getIntPtrConstant(StackAlign-1)); 6141c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Mask out the low bits for alignment purposes. 6151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner AllocSize = DAG.getNode(ISD::AND, AllocSize.getValueType(), AllocSize, 6161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner getIntPtrConstant(~(uint64_t)(StackAlign-1))); 6171c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 6181c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 619adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner std::vector<MVT::ValueType> VTs; 620adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner VTs.push_back(AllocSize.getValueType()); 621adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner VTs.push_back(MVT::Other); 622adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner std::vector<SDOperand> Ops; 623adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner Ops.push_back(getRoot()); 624adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner Ops.push_back(AllocSize); 625adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner Ops.push_back(getIntPtrConstant(Align)); 626adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner SDOperand DSA = DAG.getNode(ISD::DYNAMIC_STACKALLOC, VTs, Ops); 6271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DAG.setRoot(setValue(&I, DSA).getValue(1)); 6281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Inform the Frame Information that we have just allocated a variable-sized 6301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // object. 6311c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner CurMBB->getParent()->getFrameInfo()->CreateVariableSizedObject(); 6321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 6331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitLoad(LoadInst &I) { 6361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Ptr = getValue(I.getOperand(0)); 637edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 638d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner SDOperand Root; 639d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner if (I.isVolatile()) 640d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner Root = getRoot(); 641d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner else { 642d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner // Do not serialize non-volatile loads against each other. 643d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner Root = DAG.getRoot(); 644d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner } 645d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner 646369e6db9b6033bb60519b0ad84afeacc9ec9b416Chris Lattner SDOperand L = DAG.getLoad(TLI.getValueType(I.getType()), Root, Ptr, 64706ef88472f7bac3512e224974e87a0a456471b82Andrew Lenharth DAG.getSrcValue(I.getOperand(0))); 648d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner setValue(&I, L); 649d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner 650d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner if (I.isVolatile()) 651d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner DAG.setRoot(L.getValue(1)); 652d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner else 653d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner PendingLoads.push_back(L.getValue(1)); 6541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 6551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitStore(StoreInst &I) { 6581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Value *SrcV = I.getOperand(0); 6591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Src = getValue(SrcV); 6601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Ptr = getValue(I.getOperand(1)); 661369e6db9b6033bb60519b0ad84afeacc9ec9b416Chris Lattner DAG.setRoot(DAG.getNode(ISD::STORE, MVT::Other, getRoot(), Src, Ptr, 66206ef88472f7bac3512e224974e87a0a456471b82Andrew Lenharth DAG.getSrcValue(I.getOperand(1)))); 6631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 6641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitCall(CallInst &I) { 66664e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner const char *RenameFn = 0; 667d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner SDOperand Tmp; 6681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Function *F = I.getCalledFunction()) 669c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner if (F->isExternal()) 670c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner switch (F->getIntrinsicID()) { 671c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case 0: // Not an LLVM intrinsic. 672c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner if (F->getName() == "fabs" || F->getName() == "fabsf") { 673c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner if (I.getNumOperands() == 2 && // Basic sanity checks. 674c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner I.getOperand(1)->getType()->isFloatingPoint() && 675c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner I.getType() == I.getOperand(1)->getType()) { 676d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner Tmp = getValue(I.getOperand(1)); 677c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner setValue(&I, DAG.getNode(ISD::FABS, Tmp.getValueType(), Tmp)); 678c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner return; 679c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner } 680c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner } 681f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner else if (F->getName() == "sin" || F->getName() == "sinf") { 682f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner if (I.getNumOperands() == 2 && // Basic sanity checks. 683f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner I.getOperand(1)->getType()->isFloatingPoint() && 684f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner I.getType() == I.getOperand(1)->getType()) { 685d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner Tmp = getValue(I.getOperand(1)); 686f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner setValue(&I, DAG.getNode(ISD::FSIN, Tmp.getValueType(), Tmp)); 687f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner return; 688f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner } 689f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner } 690f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner else if (F->getName() == "cos" || F->getName() == "cosf") { 691f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner if (I.getNumOperands() == 2 && // Basic sanity checks. 692f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner I.getOperand(1)->getType()->isFloatingPoint() && 693f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner I.getType() == I.getOperand(1)->getType()) { 694d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner Tmp = getValue(I.getOperand(1)); 695f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner setValue(&I, DAG.getNode(ISD::FCOS, Tmp.getValueType(), Tmp)); 696f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner return; 697f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner } 698f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner } 699c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner break; 700c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::vastart: visitVAStart(I); return; 701c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::vaend: visitVAEnd(I); return; 702c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::vacopy: visitVACopy(I); return; 703c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::returnaddress: visitFrameReturnAddress(I, false); return; 704c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::frameaddress: visitFrameReturnAddress(I, true); return; 705d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner 706c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::setjmp: RenameFn = "setjmp"; break; 707c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::longjmp: RenameFn = "longjmp"; break; 708c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::memcpy: visitMemIntrinsic(I, ISD::MEMCPY); return; 709c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::memset: visitMemIntrinsic(I, ISD::MEMSET); return; 710c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::memmove: visitMemIntrinsic(I, ISD::MEMMOVE); return; 711edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 712d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner case Intrinsic::readport: 7131ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner case Intrinsic::readio: { 7141ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner std::vector<MVT::ValueType> VTs; 7151ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner VTs.push_back(TLI.getValueType(I.getType())); 7161ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner VTs.push_back(MVT::Other); 7171ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner std::vector<SDOperand> Ops; 7181ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner Ops.push_back(getRoot()); 7191ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner Ops.push_back(getValue(I.getOperand(1))); 720d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner Tmp = DAG.getNode(F->getIntrinsicID() == Intrinsic::readport ? 7211ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner ISD::READPORT : ISD::READIO, VTs, Ops); 7221ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner 723d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner setValue(&I, Tmp); 724d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner DAG.setRoot(Tmp.getValue(1)); 725d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner return; 7261ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner } 727d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner case Intrinsic::writeport: 728d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner case Intrinsic::writeio: 729d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner DAG.setRoot(DAG.getNode(F->getIntrinsicID() == Intrinsic::writeport ? 730d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner ISD::WRITEPORT : ISD::WRITEIO, MVT::Other, 731d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner getRoot(), getValue(I.getOperand(1)), 732d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner getValue(I.getOperand(2)))); 733d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner return; 7347ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner case Intrinsic::dbg_stoppoint: 7357ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner case Intrinsic::dbg_region_start: 7367ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner case Intrinsic::dbg_region_end: 7377ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner case Intrinsic::dbg_func_start: 7387ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner case Intrinsic::dbg_declare: 7397ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner if (I.getType() != Type::VoidTy) 7407ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner setValue(&I, DAG.getNode(ISD::UNDEF, TLI.getValueType(I.getType()))); 7417ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner return; 7427ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner 743c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::isunordered: 744c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner setValue(&I, DAG.getSetCC(ISD::SETUO, MVT::i1,getValue(I.getOperand(1)), 745c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner getValue(I.getOperand(2)))); 746c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner return; 747f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner 748f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner case Intrinsic::sqrt: 749f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner setValue(&I, DAG.getNode(ISD::FSQRT, 750f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner getValue(I.getOperand(1)).getValueType(), 751f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner getValue(I.getOperand(1)))); 752f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner return; 753f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner 754d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner case Intrinsic::pcmarker: 755d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner Tmp = getValue(I.getOperand(1)); 756d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner DAG.setRoot(DAG.getNode(ISD::PCMARKER, MVT::Other, getRoot(), Tmp)); 757c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner return; 758691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth case Intrinsic::cttz: 759691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth setValue(&I, DAG.getNode(ISD::CTTZ, 760691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth getValue(I.getOperand(1)).getValueType(), 761691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth getValue(I.getOperand(1)))); 762691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth return; 763691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth case Intrinsic::ctlz: 764691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth setValue(&I, DAG.getNode(ISD::CTLZ, 765691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth getValue(I.getOperand(1)).getValueType(), 766691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth getValue(I.getOperand(1)))); 767691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth return; 768691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth case Intrinsic::ctpop: 769691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth setValue(&I, DAG.getNode(ISD::CTPOP, 770691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth getValue(I.getOperand(1)).getValueType(), 771691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth getValue(I.getOperand(1)))); 772691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth return; 773d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner default: 774d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner std::cerr << I; 775d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner assert(0 && "This intrinsic is not implemented yet!"); 776d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner return; 777c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner } 778edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 77964e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner SDOperand Callee; 78064e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner if (!RenameFn) 78164e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner Callee = getValue(I.getOperand(0)); 78264e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner else 78364e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner Callee = DAG.getExternalSymbol(RenameFn, TLI.getPointerTy()); 7841c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::vector<std::pair<SDOperand, const Type*> > Args; 785edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 7861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (unsigned i = 1, e = I.getNumOperands(); i != e; ++i) { 7871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Value *Arg = I.getOperand(i); 7881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand ArgNode = getValue(Arg); 7891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Args.push_back(std::make_pair(ArgNode, Arg->getType())); 7901c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 791edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 7928e21e71b248365c69c0f666518c378b5819ce6fbNate Begeman const PointerType *PT = cast<PointerType>(I.getCalledValue()->getType()); 7938e21e71b248365c69c0f666518c378b5819ce6fbNate Begeman const FunctionType *FTy = cast<FunctionType>(PT->getElementType()); 794edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 795cf5734dddd66af9388a171b44996505ede47feedChris Lattner std::pair<SDOperand,SDOperand> Result = 7969092fa310c8b2b1645b0d448c4c34b1e8ddc131dChris Lattner TLI.LowerCallTo(getRoot(), I.getType(), FTy->isVarArg(), I.getCallingConv(), 797adf6a965a321372c640845407195594835921eb4Chris Lattner I.isTailCall(), Callee, Args, DAG); 7981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (I.getType() != Type::VoidTy) 799cf5734dddd66af9388a171b44996505ede47feedChris Lattner setValue(&I, Result.first); 800cf5734dddd66af9388a171b44996505ede47feedChris Lattner DAG.setRoot(Result.second); 8011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 8021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 8031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitMalloc(MallocInst &I) { 8041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Src = getValue(I.getOperand(0)); 8051c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 8061c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType IntPtr = TLI.getPointerTy(); 80768cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner 80868cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner if (IntPtr < Src.getValueType()) 80968cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner Src = DAG.getNode(ISD::TRUNCATE, IntPtr, Src); 81068cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner else if (IntPtr > Src.getValueType()) 81168cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner Src = DAG.getNode(ISD::ZERO_EXTEND, IntPtr, Src); 8121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 8131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Scale the source by the type size. 8141c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner uint64_t ElementSize = TD.getTypeSize(I.getType()->getElementType()); 8151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Src = DAG.getNode(ISD::MUL, Src.getValueType(), 8161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Src, getIntPtrConstant(ElementSize)); 8171c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 8181c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::vector<std::pair<SDOperand, const Type*> > Args; 8191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Args.push_back(std::make_pair(Src, TLI.getTargetData().getIntPtrType())); 820cf5734dddd66af9388a171b44996505ede47feedChris Lattner 821cf5734dddd66af9388a171b44996505ede47feedChris Lattner std::pair<SDOperand,SDOperand> Result = 822adf6a965a321372c640845407195594835921eb4Chris Lattner TLI.LowerCallTo(getRoot(), I.getType(), false, CallingConv::C, true, 823cf5734dddd66af9388a171b44996505ede47feedChris Lattner DAG.getExternalSymbol("malloc", IntPtr), 824cf5734dddd66af9388a171b44996505ede47feedChris Lattner Args, DAG); 825cf5734dddd66af9388a171b44996505ede47feedChris Lattner setValue(&I, Result.first); // Pointers always fit in registers 826cf5734dddd66af9388a171b44996505ede47feedChris Lattner DAG.setRoot(Result.second); 8271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 8281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 8291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitFree(FreeInst &I) { 8301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::vector<std::pair<SDOperand, const Type*> > Args; 8311c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Args.push_back(std::make_pair(getValue(I.getOperand(0)), 8321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TLI.getTargetData().getIntPtrType())); 8331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType IntPtr = TLI.getPointerTy(); 834cf5734dddd66af9388a171b44996505ede47feedChris Lattner std::pair<SDOperand,SDOperand> Result = 835adf6a965a321372c640845407195594835921eb4Chris Lattner TLI.LowerCallTo(getRoot(), Type::VoidTy, false, CallingConv::C, true, 836cf5734dddd66af9388a171b44996505ede47feedChris Lattner DAG.getExternalSymbol("free", IntPtr), Args, DAG); 837cf5734dddd66af9388a171b44996505ede47feedChris Lattner DAG.setRoot(Result.second); 8381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 8391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 84039ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattnerstd::pair<SDOperand, SDOperand> 841558bc88a00930fce283b240b7c9555f649a18f1bAndrew LenharthTargetLowering::LowerVAStart(SDOperand Chain, SelectionDAG &DAG, SDOperand Dest) { 8421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // We have no sane default behavior, just emit a useful error message and bail 8431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // out. 84439ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner std::cerr << "Variable arguments handling not implemented on this target!\n"; 8451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner abort(); 846d3f03e4b50feb6abfa9fec8b0aa705d45134c59eMisha Brukman return std::make_pair(SDOperand(), SDOperand()); 8471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 8481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 84939ae3622791986a0232f7e4797b633f8fa9e54d2Chris LattnerSDOperand TargetLowering::LowerVAEnd(SDOperand Chain, SDOperand L, 85039ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner SelectionDAG &DAG) { 85139ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner // Default to a noop. 85239ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner return Chain; 85339ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner} 85439ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner 85539ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattnerstd::pair<SDOperand,SDOperand> 856558bc88a00930fce283b240b7c9555f649a18f1bAndrew LenharthTargetLowering::LowerVACopy(SDOperand Chain, SDOperand Src, SDOperand Dest, 857558bc88a00930fce283b240b7c9555f649a18f1bAndrew Lenharth SelectionDAG &DAG) { 858213e557cef3e653e2d3a00b07b137c143128430aAndrew Lenharth //Default to returning the input list 859213e557cef3e653e2d3a00b07b137c143128430aAndrew Lenharth SDOperand Val = DAG.getLoad(getPointerTy(), Chain, Src, DAG.getSrcValue(NULL)); 860213e557cef3e653e2d3a00b07b137c143128430aAndrew Lenharth SDOperand Result = DAG.getNode(ISD::STORE, MVT::Other, Val.getValue(1), 861213e557cef3e653e2d3a00b07b137c143128430aAndrew Lenharth Val, Dest, DAG.getSrcValue(NULL)); 862213e557cef3e653e2d3a00b07b137c143128430aAndrew Lenharth return std::make_pair(Result, Result); 86339ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner} 86439ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner 86539ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattnerstd::pair<SDOperand,SDOperand> 866558bc88a00930fce283b240b7c9555f649a18f1bAndrew LenharthTargetLowering::LowerVAArgNext(SDOperand Chain, SDOperand VAList, 86739ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner const Type *ArgTy, SelectionDAG &DAG) { 8681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // We have no sane default behavior, just emit a useful error message and bail 8691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // out. 87039ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner std::cerr << "Variable arguments handling not implemented on this target!\n"; 8711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner abort(); 872d3f03e4b50feb6abfa9fec8b0aa705d45134c59eMisha Brukman return std::make_pair(SDOperand(), SDOperand()); 8731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 87439ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner 87539ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner 87639ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattnervoid SelectionDAGLowering::visitVAStart(CallInst &I) { 877558bc88a00930fce283b240b7c9555f649a18f1bAndrew Lenharth std::pair<SDOperand,SDOperand> Result = TLI.LowerVAStart(getRoot(), DAG, getValue(I.getOperand(1))); 87839ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner setValue(&I, Result.first); 87939ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner DAG.setRoot(Result.second); 88039ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner} 88139ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner 8821c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitVAArg(VAArgInst &I) { 88339ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner std::pair<SDOperand,SDOperand> Result = 884558bc88a00930fce283b240b7c9555f649a18f1bAndrew Lenharth TLI.LowerVAArgNext(getRoot(), getValue(I.getOperand(0)), 885558bc88a00930fce283b240b7c9555f649a18f1bAndrew Lenharth I.getType(), DAG); 88639ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner setValue(&I, Result.first); 88739ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner DAG.setRoot(Result.second); 8881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 8891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 8901c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitVAEnd(CallInst &I) { 891a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(TLI.LowerVAEnd(getRoot(), getValue(I.getOperand(1)), DAG)); 8921c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 8931c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 8941c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitVACopy(CallInst &I) { 89539ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner std::pair<SDOperand,SDOperand> Result = 896558bc88a00930fce283b240b7c9555f649a18f1bAndrew Lenharth TLI.LowerVACopy(getRoot(), getValue(I.getOperand(2)), getValue(I.getOperand(1)), DAG); 89739ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner setValue(&I, Result.first); 89839ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner DAG.setRoot(Result.second); 8991c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 9001c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 90239ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner// It is always conservatively correct for llvm.returnaddress and 90339ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner// llvm.frameaddress to return 0. 90439ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattnerstd::pair<SDOperand, SDOperand> 90539ae3622791986a0232f7e4797b633f8fa9e54d2Chris LattnerTargetLowering::LowerFrameReturnAddress(bool isFrameAddr, SDOperand Chain, 90639ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner unsigned Depth, SelectionDAG &DAG) { 90739ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner return std::make_pair(DAG.getConstant(0, getPointerTy()), Chain); 9081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 9091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 91050381b6c4180e9a2b983d4623da2e485cd768632Chris LattnerSDOperand TargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) { 911171453a284b097f1ee89fb87ff495c3a6c7b6297Chris Lattner assert(0 && "LowerOperation not implemented for this target!"); 912171453a284b097f1ee89fb87ff495c3a6c7b6297Chris Lattner abort(); 913d3f03e4b50feb6abfa9fec8b0aa705d45134c59eMisha Brukman return SDOperand(); 914171453a284b097f1ee89fb87ff495c3a6c7b6297Chris Lattner} 915171453a284b097f1ee89fb87ff495c3a6c7b6297Chris Lattner 91639ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattnervoid SelectionDAGLowering::visitFrameReturnAddress(CallInst &I, bool isFrame) { 91739ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner unsigned Depth = (unsigned)cast<ConstantUInt>(I.getOperand(1))->getValue(); 91839ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner std::pair<SDOperand,SDOperand> Result = 919a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner TLI.LowerFrameReturnAddress(isFrame, getRoot(), Depth, DAG); 92039ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner setValue(&I, Result.first); 92139ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner DAG.setRoot(Result.second); 92239ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner} 9231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9247041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattnervoid SelectionDAGLowering::visitMemIntrinsic(CallInst &I, unsigned Op) { 9257041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner std::vector<SDOperand> Ops; 926a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner Ops.push_back(getRoot()); 9277041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner Ops.push_back(getValue(I.getOperand(1))); 9287041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner Ops.push_back(getValue(I.getOperand(2))); 9297041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner Ops.push_back(getValue(I.getOperand(3))); 9307041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner Ops.push_back(getValue(I.getOperand(4))); 9317041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner DAG.setRoot(DAG.getNode(Op, MVT::Other, Ops)); 9321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 9331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9347041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner//===----------------------------------------------------------------------===// 9357041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner// SelectionDAGISel code 9367041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner//===----------------------------------------------------------------------===// 9371c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerunsigned SelectionDAGISel::MakeReg(MVT::ValueType VT) { 9391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return RegMap->createVirtualRegister(TLI.getRegClassFor(VT)); 9401c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 9411c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9441c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerbool SelectionDAGISel::runOnFunction(Function &Fn) { 9451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineFunction &MF = MachineFunction::construct(&Fn, TLI.getTargetMachine()); 9461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner RegMap = MF.getSSARegMap(); 9471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(std::cerr << "\n\n\n=== " << Fn.getName() << "\n"); 9481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FunctionLoweringInfo FuncInfo(TLI, Fn, MF); 9501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (Function::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I) 9521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SelectBasicBlock(I, MF, FuncInfo); 953edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 9541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return true; 9551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 9561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 958ddb870b065984007a0df645ad97c6ad6a6f12de0Chris LattnerSDOperand SelectionDAGISel:: 959ddb870b065984007a0df645ad97c6ad6a6f12de0Chris LattnerCopyValueToVirtualRegister(SelectionDAGLowering &SDL, Value *V, unsigned Reg) { 9601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SelectionDAG &DAG = SDL.DAG; 961f1fdacae8c1bd9e5ff4619546b3a28e93fb75ab5Chris Lattner SDOperand Op = SDL.getValue(V); 96218c2f13e0f9d0e5d6227cf6d1881e9ee3d1b6109Chris Lattner assert((Op.getOpcode() != ISD::CopyFromReg || 96318c2f13e0f9d0e5d6227cf6d1881e9ee3d1b6109Chris Lattner cast<RegSDNode>(Op)->getReg() != Reg) && 96418c2f13e0f9d0e5d6227cf6d1881e9ee3d1b6109Chris Lattner "Copy from a reg to the same reg!"); 965a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner return DAG.getCopyToReg(SDL.getRoot(), Op, Reg); 9661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 9671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9680afa8e348eab21d3e09ae3240544886d61879266Chris Lattner/// IsOnlyUsedInOneBasicBlock - If the specified argument is only used in a 9690afa8e348eab21d3e09ae3240544886d61879266Chris Lattner/// single basic block, return that block. Otherwise, return a null pointer. 9700afa8e348eab21d3e09ae3240544886d61879266Chris Lattnerstatic BasicBlock *IsOnlyUsedInOneBasicBlock(Argument *A) { 9710afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (A->use_empty()) return 0; 9720afa8e348eab21d3e09ae3240544886d61879266Chris Lattner BasicBlock *BB = cast<Instruction>(A->use_back())->getParent(); 9730afa8e348eab21d3e09ae3240544886d61879266Chris Lattner for (Argument::use_iterator UI = A->use_begin(), E = A->use_end(); UI != E; 9740afa8e348eab21d3e09ae3240544886d61879266Chris Lattner ++UI) 9750afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (isa<PHINode>(*UI) || cast<Instruction>(*UI)->getParent() != BB) 9760afa8e348eab21d3e09ae3240544886d61879266Chris Lattner return 0; // Disagreement among the users? 977aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner 978aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner // Okay, there is a single BB user. Only permit this optimization if this is 979aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner // the entry block, otherwise, we might sink argument loads into loops and 980aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner // stuff. Later, when we have global instruction selection, this won't be an 981aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner // issue clearly. 982aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner if (BB == BB->getParent()->begin()) 983aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner return BB; 984aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner return 0; 9850afa8e348eab21d3e09ae3240544886d61879266Chris Lattner} 9860afa8e348eab21d3e09ae3240544886d61879266Chris Lattner 987068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattnervoid SelectionDAGISel:: 988068a81e9fca511b9a3b3a0f28a8988a57f994652Chris LattnerLowerArguments(BasicBlock *BB, SelectionDAGLowering &SDL, 989068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner std::vector<SDOperand> &UnorderedChains) { 9901c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If this is the entry block, emit arguments. 991068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner Function &F = *BB->getParent(); 9920afa8e348eab21d3e09ae3240544886d61879266Chris Lattner FunctionLoweringInfo &FuncInfo = SDL.FuncInfo; 993068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner 994068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner if (BB == &F.front()) { 9950afa8e348eab21d3e09ae3240544886d61879266Chris Lattner SDOperand OldRoot = SDL.DAG.getRoot(); 9960afa8e348eab21d3e09ae3240544886d61879266Chris Lattner 997068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner std::vector<SDOperand> Args = TLI.LowerArguments(F, SDL.DAG); 998068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner 9990afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // If there were side effects accessing the argument list, do not do 10000afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // anything special. 10010afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (OldRoot != SDL.DAG.getRoot()) { 10020afa8e348eab21d3e09ae3240544886d61879266Chris Lattner unsigned a = 0; 1003a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner for (Function::arg_iterator AI = F.arg_begin(), E = F.arg_end(); 1004a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner AI != E; ++AI,++a) 10050afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (!AI->use_empty()) { 10060afa8e348eab21d3e09ae3240544886d61879266Chris Lattner SDL.setValue(AI, Args[a]); 1007edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman SDOperand Copy = 10080afa8e348eab21d3e09ae3240544886d61879266Chris Lattner CopyValueToVirtualRegister(SDL, AI, FuncInfo.ValueMap[AI]); 10090afa8e348eab21d3e09ae3240544886d61879266Chris Lattner UnorderedChains.push_back(Copy); 10100afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } 10110afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } else { 10120afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // Otherwise, if any argument is only accessed in a single basic block, 10130afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // emit that argument only to that basic block. 10140afa8e348eab21d3e09ae3240544886d61879266Chris Lattner unsigned a = 0; 1015a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner for (Function::arg_iterator AI = F.arg_begin(), E = F.arg_end(); 1016a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner AI != E; ++AI,++a) 10170afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (!AI->use_empty()) { 10180afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (BasicBlock *BBU = IsOnlyUsedInOneBasicBlock(AI)) { 10190afa8e348eab21d3e09ae3240544886d61879266Chris Lattner FuncInfo.BlockLocalArguments.insert(std::make_pair(BBU, 10200afa8e348eab21d3e09ae3240544886d61879266Chris Lattner std::make_pair(AI, a))); 10210afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } else { 10220afa8e348eab21d3e09ae3240544886d61879266Chris Lattner SDL.setValue(AI, Args[a]); 1023edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman SDOperand Copy = 10240afa8e348eab21d3e09ae3240544886d61879266Chris Lattner CopyValueToVirtualRegister(SDL, AI, FuncInfo.ValueMap[AI]); 10250afa8e348eab21d3e09ae3240544886d61879266Chris Lattner UnorderedChains.push_back(Copy); 10260afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } 10270afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } 10280afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } 1029405ef9e28d955c1b107c27bedfd4be8b9165af01Chris Lattner 1030405ef9e28d955c1b107c27bedfd4be8b9165af01Chris Lattner EmitFunctionEntryCode(F, SDL.DAG.getMachineFunction()); 10310afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } 10321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 10330afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // See if there are any block-local arguments that need to be emitted in this 10340afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // block. 10350afa8e348eab21d3e09ae3240544886d61879266Chris Lattner 10360afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (!FuncInfo.BlockLocalArguments.empty()) { 10370afa8e348eab21d3e09ae3240544886d61879266Chris Lattner std::multimap<BasicBlock*, std::pair<Argument*, unsigned> >::iterator BLAI = 10380afa8e348eab21d3e09ae3240544886d61879266Chris Lattner FuncInfo.BlockLocalArguments.lower_bound(BB); 10390afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (BLAI != FuncInfo.BlockLocalArguments.end() && BLAI->first == BB) { 10400afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // Lower the arguments into this block. 10410afa8e348eab21d3e09ae3240544886d61879266Chris Lattner std::vector<SDOperand> Args = TLI.LowerArguments(F, SDL.DAG); 1042edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 10430afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // Set up the value mapping for the local arguments. 10440afa8e348eab21d3e09ae3240544886d61879266Chris Lattner for (; BLAI != FuncInfo.BlockLocalArguments.end() && BLAI->first == BB; 10450afa8e348eab21d3e09ae3240544886d61879266Chris Lattner ++BLAI) 10460afa8e348eab21d3e09ae3240544886d61879266Chris Lattner SDL.setValue(BLAI->second.first, Args[BLAI->second.second]); 1047edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 10480afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // Any dead arguments will just be ignored here. 10490afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } 10501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1051068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner} 1052068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner 1053068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner 1054068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattnervoid SelectionDAGISel::BuildSelectionDAG(SelectionDAG &DAG, BasicBlock *LLVMBB, 1055068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner std::vector<std::pair<MachineInstr*, unsigned> > &PHINodesToUpdate, 1056068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner FunctionLoweringInfo &FuncInfo) { 1057068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner SelectionDAGLowering SDL(DAG, TLI, FuncInfo); 1058068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner 1059068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner std::vector<SDOperand> UnorderedChains; 1060edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 1061068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner // Lower any arguments needed in this block. 1062068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner LowerArguments(LLVMBB, SDL, UnorderedChains); 10631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 10641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner BB = FuncInfo.MBBMap[LLVMBB]; 10651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDL.setCurrentBasicBlock(BB); 10661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 10671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Lower all of the non-terminator instructions. 10681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (BasicBlock::iterator I = LLVMBB->begin(), E = --LLVMBB->end(); 10691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner I != E; ++I) 10701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDL.visit(*I); 10711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 10721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Ensure that all instructions which are used outside of their defining 10731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // blocks are available as virtual registers. 10741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (BasicBlock::iterator I = LLVMBB->begin(), E = LLVMBB->end(); I != E;++I) 1075f1fdacae8c1bd9e5ff4619546b3a28e93fb75ab5Chris Lattner if (!I->use_empty() && !isa<PHINode>(I)) { 1076ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner std::map<const Value*, unsigned>::iterator VMI =FuncInfo.ValueMap.find(I); 10771c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (VMI != FuncInfo.ValueMap.end()) 1078ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner UnorderedChains.push_back( 1079ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner CopyValueToVirtualRegister(SDL, I, VMI->second)); 10801c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 10811c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 10821c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Handle PHI nodes in successor blocks. Emit code into the SelectionDAG to 10831c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // ensure constants are generated when needed. Remember the virtual registers 10841c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // that need to be added to the Machine PHI nodes as input. We cannot just 10851c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // directly add them, because expansion might result in multiple MBB's for one 10861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // BB. As such, the start of the BB might correspond to a different MBB than 10871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // the end. 1088edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman // 10891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 10901c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Emit constants only once even if used by multiple PHI nodes. 10911c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<Constant*, unsigned> ConstantsOut; 10921c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 10931c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Check successor nodes PHI nodes that expect a constant to be available from 10941c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // this block. 10951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TerminatorInst *TI = LLVMBB->getTerminator(); 10961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (unsigned succ = 0, e = TI->getNumSuccessors(); succ != e; ++succ) { 10971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner BasicBlock *SuccBB = TI->getSuccessor(succ); 10981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock::iterator MBBI = FuncInfo.MBBMap[SuccBB]->begin(); 10991c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner PHINode *PN; 11001c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // At this point we know that there is a 1-1 correspondence between LLVM PHI 11021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // nodes and Machine PHI nodes, but the incoming operands have not been 11031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // emitted yet. 11041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (BasicBlock::iterator I = SuccBB->begin(); 1105f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner (PN = dyn_cast<PHINode>(I)); ++I) 1106f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner if (!PN->use_empty()) { 1107f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner unsigned Reg; 1108f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner Value *PHIOp = PN->getIncomingValueForBlock(LLVMBB); 1109f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner if (Constant *C = dyn_cast<Constant>(PHIOp)) { 1110f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner unsigned &RegOut = ConstantsOut[C]; 1111f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner if (RegOut == 0) { 1112f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner RegOut = FuncInfo.CreateRegForValue(C); 1113ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner UnorderedChains.push_back( 1114ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner CopyValueToVirtualRegister(SDL, C, RegOut)); 1115f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner } 1116f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner Reg = RegOut; 1117f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner } else { 1118f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner Reg = FuncInfo.ValueMap[PHIOp]; 1119ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner if (Reg == 0) { 1120edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman assert(isa<AllocaInst>(PHIOp) && 1121ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner FuncInfo.StaticAllocaMap.count(cast<AllocaInst>(PHIOp)) && 1122ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner "Didn't codegen value into a register!??"); 1123ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner Reg = FuncInfo.CreateRegForValue(PHIOp); 1124ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner UnorderedChains.push_back( 1125ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner CopyValueToVirtualRegister(SDL, PHIOp, Reg)); 1126ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner } 11271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1128edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 1129f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner // Remember that this register needs to added to the machine PHI node as 1130f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner // the input for this MBB. 1131f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner unsigned NumElements = 1132f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner TLI.getNumElements(TLI.getValueType(PN->getType())); 1133f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner for (unsigned i = 0, e = NumElements; i != e; ++i) 1134f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner PHINodesToUpdate.push_back(std::make_pair(MBBI++, Reg+i)); 11351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 11361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 11371c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner ConstantsOut.clear(); 11381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1139ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner // Turn all of the unordered chains into one factored node. 11405a6c6d98d561df671350a56c8031a3611f1c46faChris Lattner if (!UnorderedChains.empty()) { 1141d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner UnorderedChains.push_back(SDL.getRoot()); 1142ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other, UnorderedChains)); 1143ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner } 1144ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner 11451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Lower the terminator after the copies are emitted. 11461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDL.visit(*LLVMBB->getTerminator()); 1147a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner 1148a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner // Make sure the root of the DAG is up-to-date. 1149a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(SDL.getRoot()); 11501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 11511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGISel::SelectBasicBlock(BasicBlock *LLVMBB, MachineFunction &MF, 11531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FunctionLoweringInfo &FuncInfo) { 1154ac9dc08c7f0ae60c125624d72c3022025d79ee9eChris Lattner SelectionDAG DAG(TLI, MF); 11551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner CurDAG = &DAG; 11561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::vector<std::pair<MachineInstr*, unsigned> > PHINodesToUpdate; 11571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // First step, lower LLVM code to some DAG. This DAG may use operations and 11591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // types that are not supported by the target. 11601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner BuildSelectionDAG(DAG, LLVMBB, PHINodesToUpdate, FuncInfo); 11611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(std::cerr << "Lowered selection DAG:\n"); 11631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(DAG.dump()); 11641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Second step, hack on the DAG until it only uses operations and types that 11661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // the target supports. 1167ac9dc08c7f0ae60c125624d72c3022025d79ee9eChris Lattner DAG.Legalize(); 11681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(std::cerr << "Legalized selection DAG:\n"); 11701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(DAG.dump()); 11711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1172a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // Third, instruction select all of the operations to machine code, adding the 1173a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // code to the MachineBasicBlock. 11741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner InstructionSelectBasicBlock(DAG); 11751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11767944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner if (ViewDAGs) DAG.viewGraph(); 11777944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner 11781c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(std::cerr << "Selected machine code:\n"); 11791c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(BB->dump()); 11801c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1181a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // Next, now that we know what the last MBB the LLVM BB expanded is, update 11821c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // PHI nodes in successors. 11831c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (unsigned i = 0, e = PHINodesToUpdate.size(); i != e; ++i) { 11841c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineInstr *PHI = PHINodesToUpdate[i].first; 11851c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(PHI->getOpcode() == TargetInstrInfo::PHI && 11861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner "This is not a machine PHI node that we are updating!"); 11871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner PHI->addRegOperand(PHINodesToUpdate[i].second); 11881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner PHI->addMachineBasicBlockOperand(BB); 11891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1190a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner 1191a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // Finally, add the CFG edges from the last selected MBB to the successor 1192a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // MBBs. 1193a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner TerminatorInst *TI = LLVMBB->getTerminator(); 1194a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner for (unsigned i = 0, e = TI->getNumSuccessors(); i != e; ++i) { 1195a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner MachineBasicBlock *Succ0MBB = FuncInfo.MBBMap[TI->getSuccessor(i)]; 1196a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner BB->addSuccessor(Succ0MBB); 1197a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner } 11981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 1199