SelectionDAGISel.cpp revision 82cfa5d616ff0f760425cbf6e2983fbab618fbda
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" 32495a0b51915eb763576874f29192820b731edc22Chris Lattner#include "llvm/Transforms/Utils/BasicBlockUtils.h" 337944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner#include "llvm/Support/CommandLine.h" 341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Support/Debug.h" 351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include <map> 361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include <iostream> 371c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerusing namespace llvm; 381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 397944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner#ifndef _NDEBUG 407944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattnerstatic cl::opt<bool> 417944d9d9957db1efe085d9df3ea89826f50029b7Chris LattnerViewDAGs("view-isel-dags", cl::Hidden, 427944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner cl::desc("Pop up a window to show isel dags as they are selected")); 437944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner#else 447944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattnerstatic const bool ViewDAGS = 0; 457944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner#endif 467944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner 471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnernamespace llvm { 481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner //===--------------------------------------------------------------------===// 491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// FunctionLoweringInfo - This contains information that is global to a 501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// function that is used when lowering a region of the function. 51f26bc8ef4827cf0023a7052b62b920b41813d473Chris Lattner class FunctionLoweringInfo { 52f26bc8ef4827cf0023a7052b62b920b41813d473Chris Lattner public: 531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TargetLowering &TLI; 541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Function &Fn; 551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineFunction &MF; 561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SSARegMap *RegMap; 571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FunctionLoweringInfo(TargetLowering &TLI, Function &Fn,MachineFunction &MF); 591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// MBBMap - A mapping from LLVM basic blocks to their machine code entry. 611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<const BasicBlock*, MachineBasicBlock *> MBBMap; 621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// ValueMap - Since we emit code for the function a basic block at a time, 641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// we must remember which virtual registers hold the values for 651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// cross-basic-block values. 661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<const Value*, unsigned> ValueMap; 671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// StaticAllocaMap - Keep track of frame indices for fixed sized allocas in 691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// the entry block. This allows the allocas to be efficiently referenced 701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// anywhere in the function. 711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<const AllocaInst*, int> StaticAllocaMap; 721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 730afa8e348eab21d3e09ae3240544886d61879266Chris Lattner /// BlockLocalArguments - If any arguments are only used in a single basic 740afa8e348eab21d3e09ae3240544886d61879266Chris Lattner /// block, and if the target can access the arguments without side-effects, 750afa8e348eab21d3e09ae3240544886d61879266Chris Lattner /// avoid emitting CopyToReg nodes for those arguments. This map keeps 760afa8e348eab21d3e09ae3240544886d61879266Chris Lattner /// track of which arguments are local to each BB. 770afa8e348eab21d3e09ae3240544886d61879266Chris Lattner std::multimap<BasicBlock*, std::pair<Argument*, 780afa8e348eab21d3e09ae3240544886d61879266Chris Lattner unsigned> > BlockLocalArguments; 790afa8e348eab21d3e09ae3240544886d61879266Chris Lattner 800afa8e348eab21d3e09ae3240544886d61879266Chris Lattner 811c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned MakeReg(MVT::ValueType VT) { 821c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return RegMap->createVirtualRegister(TLI.getRegClassFor(VT)); 831c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 84edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 851c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned CreateRegForValue(const Value *V) { 861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType VT = TLI.getValueType(V->getType()); 871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // The common case is that we will only create one register for this 881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // value. If we have that case, create and return the virtual register. 891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned NV = TLI.getNumElements(VT); 90fb849800ea2040c188365c265421ad54fbdcf219Chris Lattner if (NV == 1) { 91fb849800ea2040c188365c265421ad54fbdcf219Chris Lattner // If we are promoting this value, pick the next largest supported type. 9298e5c0e5e4c5be1b531d287d0a1373a62fe562e2Chris Lattner return MakeReg(TLI.getTypeToTransformTo(VT)); 93fb849800ea2040c188365c265421ad54fbdcf219Chris Lattner } 94edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If this value is represented with multiple target registers, make sure 961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // to create enough consequtive registers of the right (smaller) type. 971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned NT = VT-1; // Find the type to use. 981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner while (TLI.getNumElements((MVT::ValueType)NT) != 1) 991c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner --NT; 100edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 1011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned R = MakeReg((MVT::ValueType)NT); 1021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (unsigned i = 1; i != NV; ++i) 1031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MakeReg((MVT::ValueType)NT); 1041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return R; 1051c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 106edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 1071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned InitializeRegForValue(const Value *V) { 1081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned &R = ValueMap[V]; 1091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(R == 0 && "Already initialized this value register!"); 1101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return R = CreateRegForValue(V); 1111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner }; 1131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 1141c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner/// isUsedOutsideOfDefiningBlock - Return true if this instruction is used by 1161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner/// PHI nodes or outside of the basic block that defines it. 1171c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerstatic bool isUsedOutsideOfDefiningBlock(Instruction *I) { 1181c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (isa<PHINode>(I)) return true; 1191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner BasicBlock *BB = I->getParent(); 1201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (Value::use_iterator UI = I->use_begin(), E = I->use_end(); UI != E; ++UI) 1211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (cast<Instruction>(*UI)->getParent() != BB || isa<PHINode>(*UI)) 1221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return true; 1231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return false; 1241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 1251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1261c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris LattnerFunctionLoweringInfo::FunctionLoweringInfo(TargetLowering &tli, 127edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman Function &fn, MachineFunction &mf) 1281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner : TLI(tli), Fn(fn), MF(mf), RegMap(MF.getSSARegMap()) { 1291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Initialize the mapping of values to registers. This is only set up for 1311c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // instruction values that are used outside of the block that defines 1321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // them. 13316ce0df92717cd1474029d87efe596d000dc2caaChris Lattner for (Function::arg_iterator AI = Fn.arg_begin(), E = Fn.arg_end(); 13416ce0df92717cd1474029d87efe596d000dc2caaChris Lattner AI != E; ++AI) 1351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner InitializeRegForValue(AI); 1361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1371c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Function::iterator BB = Fn.begin(), E = Fn.end(); 1381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) 1391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (AllocaInst *AI = dyn_cast<AllocaInst>(I)) 1401c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (ConstantUInt *CUI = dyn_cast<ConstantUInt>(AI->getArraySize())) { 1411c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const Type *Ty = AI->getAllocatedType(); 1421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner uint64_t TySize = TLI.getTargetData().getTypeSize(Ty); 1431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned Align = TLI.getTargetData().getTypeAlignment(Ty); 144a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner 145a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner // If the alignment of the value is smaller than the size of the value, 146a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner // and if the size of the value is particularly small (<= 8 bytes), 147a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner // round up to the size of the value for potentially better performance. 148a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner // 149a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner // FIXME: This could be made better with a preferred alignment hook in 150a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner // TargetData. It serves primarily to 8-byte align doubles for X86. 151a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner if (Align < TySize && TySize <= 8) Align = TySize; 152a8217e3000b5b01c4a95316aef078a9d02a9a119Chris Lattner 1531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TySize *= CUI->getValue(); // Get total allocated size. 1541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner StaticAllocaMap[AI] = 155f26bc8ef4827cf0023a7052b62b920b41813d473Chris Lattner MF.getFrameInfo()->CreateStackObject((unsigned)TySize, Align); 1561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (; BB != E; ++BB) 159f26bc8ef4827cf0023a7052b62b920b41813d473Chris Lattner for (BasicBlock::iterator I = BB->begin(), e = BB->end(); I != e; ++I) 1601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (!I->use_empty() && isUsedOutsideOfDefiningBlock(I)) 1611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (!isa<AllocaInst>(I) || 1621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner !StaticAllocaMap.count(cast<AllocaInst>(I))) 1631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner InitializeRegForValue(I); 1641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Create an initial MachineBasicBlock for each LLVM BasicBlock in F. This 1661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // also creates the initial PHI MachineInstrs, though none of the input 1671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // operands are populated. 1681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (Function::iterator BB = Fn.begin(), E = Fn.end(); BB != E; ++BB) { 1691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock *MBB = new MachineBasicBlock(BB); 1701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MBBMap[BB] = MBB; 1711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MF.getBasicBlockList().push_back(MBB); 1721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Create Machine PHI nodes for LLVM PHI nodes, lowering them as 1741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // appropriate. 1751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner PHINode *PN; 1761c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (BasicBlock::iterator I = BB->begin(); 177f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner (PN = dyn_cast<PHINode>(I)); ++I) 178f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner if (!PN->use_empty()) { 179f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner unsigned NumElements = 180f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner TLI.getNumElements(TLI.getValueType(PN->getType())); 181f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner unsigned PHIReg = ValueMap[PN]; 182f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner assert(PHIReg &&"PHI node does not have an assigned virtual register!"); 183f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner for (unsigned i = 0; i != NumElements; ++i) 184f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner BuildMI(MBB, TargetInstrInfo::PHI, PN->getNumOperands(), PHIReg+i); 185f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner } 1861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 1881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1901c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1911c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner//===----------------------------------------------------------------------===// 1921c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner/// SelectionDAGLowering - This is the common target-independent lowering 1931c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner/// implementation that is parameterized by a TargetLowering object. 1941c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner/// Also, targets can overload any lowering method. 1951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner/// 1961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnernamespace llvm { 1971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerclass SelectionDAGLowering { 1981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock *CurMBB; 1991c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2001c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<const Value*, SDOperand> NodeMap; 2011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 202d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner /// PendingLoads - Loads are not emitted to the program immediately. We bunch 203d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner /// them up and then emit token factor nodes when possible. This allows us to 204d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner /// get simple disambiguation between loads without worrying about alias 205d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner /// analysis. 206d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner std::vector<SDOperand> PendingLoads; 207d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner 2081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerpublic: 2091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // TLI - This is information that describes the available target features we 2101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // need for lowering. This indicates when operations are unavailable, 2111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // implemented with a libcall, etc. 2121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TargetLowering &TLI; 2131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SelectionDAG &DAG; 2141c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const TargetData &TD; 2151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// FuncInfo - Information about the function as a whole. 2171c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner /// 2181c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FunctionLoweringInfo &FuncInfo; 2191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SelectionDAGLowering(SelectionDAG &dag, TargetLowering &tli, 221edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman FunctionLoweringInfo &funcinfo) 2221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner : TLI(tli), DAG(dag), TD(DAG.getTarget().getTargetData()), 2231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FuncInfo(funcinfo) { 2241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 2251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 226a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner /// getRoot - Return the current virtual root of the Selection DAG. 227a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner /// 228a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner SDOperand getRoot() { 229d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner if (PendingLoads.empty()) 230d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner return DAG.getRoot(); 231edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 232d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner if (PendingLoads.size() == 1) { 233d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner SDOperand Root = PendingLoads[0]; 234d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner DAG.setRoot(Root); 235d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner PendingLoads.clear(); 236d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner return Root; 237d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner } 238d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner 239d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner // Otherwise, we have to make a token factor node. 240d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner SDOperand Root = DAG.getNode(ISD::TokenFactor, MVT::Other, PendingLoads); 241d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner PendingLoads.clear(); 242d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner DAG.setRoot(Root); 243d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner return Root; 244a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner } 245a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner 2461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visit(Instruction &I) { visit(I.getOpcode(), I); } 2471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visit(unsigned Opcode, User &I) { 2491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner switch (Opcode) { 2501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner default: assert(0 && "Unknown instruction type encountered!"); 2511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner abort(); 2521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Build the switch statement using the Instruction.def file. 2531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#define HANDLE_INST(NUM, OPCODE, CLASS) \ 2541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case Instruction::OPCODE:return visit##OPCODE((CLASS&)I); 2551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Instruction.def" 2561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 2571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 2581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void setCurrentBasicBlock(MachineBasicBlock *MBB) { CurMBB = MBB; } 2601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand getIntPtrConstant(uint64_t Val) { 2631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return DAG.getConstant(Val, TLI.getPointerTy()); 2641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 2651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand getValue(const Value *V) { 2671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand &N = NodeMap[V]; 2681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (N.Val) return N; 2691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType VT = TLI.getValueType(V->getType()); 2711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V))) 2721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { 2731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner visit(CE->getOpcode(), *CE); 2741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(N.Val && "visit didn't populate the ValueMap!"); 2751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return N; 2761c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else if (GlobalValue *GV = dyn_cast<GlobalValue>(C)) { 2771c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return N = DAG.getGlobalAddress(GV, VT); 2781c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else if (isa<ConstantPointerNull>(C)) { 2791c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return N = DAG.getConstant(0, TLI.getPointerTy()); 2801c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else if (isa<UndefValue>(C)) { 281b882752bd04602249d391699dc7183de007f8964Nate Begeman return N = DAG.getNode(ISD::UNDEF, VT); 2821c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) { 2831c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return N = DAG.getConstantFP(CFP->getValue(), VT); 2841c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else { 2851c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Canonicalize all constant ints to be unsigned. 2861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return N = DAG.getConstant(cast<ConstantIntegral>(C)->getRawValue(),VT); 2871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 2881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (const AllocaInst *AI = dyn_cast<AllocaInst>(V)) { 2901c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<const AllocaInst*, int>::iterator SI = 2911c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FuncInfo.StaticAllocaMap.find(AI); 2921c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (SI != FuncInfo.StaticAllocaMap.end()) 2931c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return DAG.getFrameIndex(SI->second, TLI.getPointerTy()); 2941c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 2951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 2961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<const Value*, unsigned>::const_iterator VMI = 2971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FuncInfo.ValueMap.find(V); 2981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(VMI != FuncInfo.ValueMap.end() && "Value not in map!"); 299c8ea3c47103656a0924909f41651bf5d396c26cdChris Lattner 300d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner unsigned InReg = VMI->second; 301d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner 302d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // If this type is not legal, make it so now. 303d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner MVT::ValueType DestVT = TLI.getTypeToTransformTo(VT); 304d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner 305d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner N = DAG.getCopyFromReg(DAG.getEntryNode(), InReg, DestVT); 306d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner if (DestVT < VT) { 307d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // Source must be expanded. This input value is actually coming from the 308d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // register pair VMI->second and VMI->second+1. 309d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner N = DAG.getNode(ISD::BUILD_PAIR, VT, N, 310d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner DAG.getCopyFromReg(DAG.getEntryNode(), InReg+1, DestVT)); 311d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner } else { 312d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner if (DestVT > VT) { // Promotion case 313d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner if (MVT::isFloatingPoint(VT)) 314d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner N = DAG.getNode(ISD::FP_ROUND, VT, N); 315d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner else 316d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner N = DAG.getNode(ISD::TRUNCATE, VT, N); 317d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner } 318d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner } 319d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner 320d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner return N; 3211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const SDOperand &setValue(const Value *V, SDOperand NewN) { 3241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand &N = NodeMap[V]; 3251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(N.Val == 0 && "Already set a value for this node!"); 3261c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return N = NewN; 3271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Terminator instructions. 3301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitRet(ReturnInst &I); 3311c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitBr(BranchInst &I); 3321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitUnreachable(UnreachableInst &I) { /* noop */ } 3331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // These all get lowered before this pass. 3351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSwitch(SwitchInst &I) { assert(0 && "TODO"); } 3361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitInvoke(InvokeInst &I) { assert(0 && "TODO"); } 3371c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitUnwind(UnwindInst &I) { assert(0 && "TODO"); } 3381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // 3408f03405ee57094d627c342fb6087399a30009a02Chris Lattner void visitBinary(User &I, unsigned Opcode, bool isShift = false); 3411c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitAdd(User &I) { visitBinary(I, ISD::ADD); } 342b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner void visitSub(User &I); 3431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitMul(User &I) { visitBinary(I, ISD::MUL); } 3441c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitDiv(User &I) { 3451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner visitBinary(I, I.getType()->isUnsigned() ? ISD::UDIV : ISD::SDIV); 3461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitRem(User &I) { 3481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner visitBinary(I, I.getType()->isUnsigned() ? ISD::UREM : ISD::SREM); 3491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitAnd(User &I) { visitBinary(I, ISD::AND); } 3511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitOr (User &I) { visitBinary(I, ISD::OR); } 3521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitXor(User &I) { visitBinary(I, ISD::XOR); } 3538f03405ee57094d627c342fb6087399a30009a02Chris Lattner void visitShl(User &I) { visitBinary(I, ISD::SHL, true); } 3541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitShr(User &I) { 3558f03405ee57094d627c342fb6087399a30009a02Chris Lattner visitBinary(I, I.getType()->isUnsigned() ? ISD::SRL : ISD::SRA, true); 3561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetCC(User &I, ISD::CondCode SignedOpc, ISD::CondCode UnsignedOpc); 3591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetEQ(User &I) { visitSetCC(I, ISD::SETEQ, ISD::SETEQ); } 3601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetNE(User &I) { visitSetCC(I, ISD::SETNE, ISD::SETNE); } 3611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetLE(User &I) { visitSetCC(I, ISD::SETLE, ISD::SETULE); } 3621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetGE(User &I) { visitSetCC(I, ISD::SETGE, ISD::SETUGE); } 3631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetLT(User &I) { visitSetCC(I, ISD::SETLT, ISD::SETULT); } 3641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSetGT(User &I) { visitSetCC(I, ISD::SETGT, ISD::SETUGT); } 3651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitGetElementPtr(User &I); 3671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitCast(User &I); 3681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitSelect(User &I); 3691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // 3701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitMalloc(MallocInst &I); 3721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitFree(FreeInst &I); 3731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitAlloca(AllocaInst &I); 3741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitLoad(LoadInst &I); 3751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitStore(StoreInst &I); 3761c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitPHI(PHINode &I) { } // PHI nodes are handled specially. 3771c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitCall(CallInst &I); 3781c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3791c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitVAStart(CallInst &I); 3801c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitVAArg(VAArgInst &I); 3811c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitVAEnd(CallInst &I); 3821c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitVACopy(CallInst &I); 38339ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner void visitFrameReturnAddress(CallInst &I, bool isFrameAddress); 3841c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3857041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner void visitMemIntrinsic(CallInst &I, unsigned Op); 3861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitUserOp1(Instruction &I) { 3881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(0 && "UserOp1 should not exist at instruction selection time!"); 3891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner abort(); 3901c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3911c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner void visitUserOp2(Instruction &I) { 3921c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(0 && "UserOp2 should not exist at instruction selection time!"); 3931c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner abort(); 3941c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 3951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner}; 3961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} // end namespace llvm 3971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitRet(ReturnInst &I) { 3991c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (I.getNumOperands() == 0) { 400a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(DAG.getNode(ISD::RET, MVT::Other, getRoot())); 4011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return; 4021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 4031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Op1 = getValue(I.getOperand(0)); 405f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner MVT::ValueType TmpVT; 406f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner 4071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner switch (Op1.getValueType()) { 4081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner default: assert(0 && "Unknown value type!"); 4091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::i1: 4101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::i8: 4111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::i16: 412f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner case MVT::i32: 413f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner // If this is a machine where 32-bits is legal or expanded, promote to 414f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner // 32-bits, otherwise, promote to 64-bits. 415f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner if (TLI.getTypeAction(MVT::i32) == TargetLowering::Promote) 416f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner TmpVT = TLI.getTypeToTransformTo(MVT::i32); 417f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner else 418f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner TmpVT = MVT::i32; 419f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner 420f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner // Extend integer types to result type. 4211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (I.getOperand(0)->getType()->isSigned()) 422f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner Op1 = DAG.getNode(ISD::SIGN_EXTEND, TmpVT, Op1); 4231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner else 424f51d3bd6769d46e7cf7beaa283d1ca449629bd32Chris Lattner Op1 = DAG.getNode(ISD::ZERO_EXTEND, TmpVT, Op1); 4251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner break; 4261c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::f32: 4271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::i64: 4281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner case MVT::f64: 4291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner break; // No extension needed! 4301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 4311c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 432a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(DAG.getNode(ISD::RET, MVT::Other, getRoot(), Op1)); 4331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 4341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitBr(BranchInst &I) { 4361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Update machine-CFG edges. 4371c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock *Succ0MBB = FuncInfo.MBBMap[I.getSuccessor(0)]; 4381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Figure out which block is immediately after the current one. 4401c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock *NextBlock = 0; 4411c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineFunction::iterator BBI = CurMBB; 4421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (++BBI != CurMBB->getParent()->end()) 4431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner NextBlock = BBI; 4441c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (I.isUnconditional()) { 4461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If this is not a fall-through branch, emit the branch. 4471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Succ0MBB != NextBlock) 448a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(DAG.getNode(ISD::BR, MVT::Other, getRoot(), 449dedf2bd5a34dac25e4245f58bb902ced6b64edd9Misha Brukman DAG.getBasicBlock(Succ0MBB))); 4501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else { 4511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock *Succ1MBB = FuncInfo.MBBMap[I.getSuccessor(1)]; 4521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Cond = getValue(I.getCondition()); 4541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Succ1MBB == NextBlock) { 4551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If the condition is false, fall through. This means we should branch 4561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // if the condition is true to Succ #0. 457a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(DAG.getNode(ISD::BRCOND, MVT::Other, getRoot(), 458dedf2bd5a34dac25e4245f58bb902ced6b64edd9Misha Brukman Cond, DAG.getBasicBlock(Succ0MBB))); 4591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else if (Succ0MBB == NextBlock) { 4601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If the condition is true, fall through. This means we should branch if 4611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // the condition is false to Succ #1. Invert the condition first. 4621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand True = DAG.getConstant(1, Cond.getValueType()); 4631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Cond = DAG.getNode(ISD::XOR, Cond.getValueType(), Cond, True); 464a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(DAG.getNode(ISD::BRCOND, MVT::Other, getRoot(), 465dedf2bd5a34dac25e4245f58bb902ced6b64edd9Misha Brukman Cond, DAG.getBasicBlock(Succ1MBB))); 4661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else { 467e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner std::vector<SDOperand> Ops; 468e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner Ops.push_back(getRoot()); 469e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner Ops.push_back(Cond); 470e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner Ops.push_back(DAG.getBasicBlock(Succ0MBB)); 471e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner Ops.push_back(DAG.getBasicBlock(Succ1MBB)); 472e7ccd4acd2ee9753e6d212efd522be5c7de154d7Chris Lattner DAG.setRoot(DAG.getNode(ISD::BRCONDTWOWAY, MVT::Other, Ops)); 4731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 4741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 4751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 4761c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 477b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattnervoid SelectionDAGLowering::visitSub(User &I) { 478b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner // -0.0 - X --> fneg 479b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner if (ConstantFP *CFP = dyn_cast<ConstantFP>(I.getOperand(0))) 480b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner if (CFP->isExactlyValue(-0.0)) { 481b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner SDOperand Op2 = getValue(I.getOperand(1)); 482b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner setValue(&I, DAG.getNode(ISD::FNEG, Op2.getValueType(), Op2)); 483b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner return; 484b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner } 485b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner 486b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner visitBinary(I, ISD::SUB); 487b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner} 488b9fccc41933648647e3f7669612c683eb5de0d58Chris Lattner 4898f03405ee57094d627c342fb6087399a30009a02Chris Lattnervoid SelectionDAGLowering::visitBinary(User &I, unsigned Opcode, bool isShift) { 4901c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Op1 = getValue(I.getOperand(0)); 4911c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Op2 = getValue(I.getOperand(1)); 4922c49f2795514a7c56b680ba0310d7eb0a8a43289Chris Lattner 4938f03405ee57094d627c342fb6087399a30009a02Chris Lattner if (isShift) 4942c49f2795514a7c56b680ba0310d7eb0a8a43289Chris Lattner Op2 = DAG.getNode(ISD::ZERO_EXTEND, TLI.getShiftAmountTy(), Op2); 4952c49f2795514a7c56b680ba0310d7eb0a8a43289Chris Lattner 4961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner setValue(&I, DAG.getNode(Opcode, Op1.getValueType(), Op1, Op2)); 4971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 4981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 4991c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitSetCC(User &I,ISD::CondCode SignedOpcode, 5001c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner ISD::CondCode UnsignedOpcode) { 5011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Op1 = getValue(I.getOperand(0)); 5021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Op2 = getValue(I.getOperand(1)); 5031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner ISD::CondCode Opcode = SignedOpcode; 5041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (I.getOperand(0)->getType()->isUnsigned()) 5051c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Opcode = UnsignedOpcode; 5067cf7e3f33f25544d08492d47cc8a1cbba25dc8d7Chris Lattner setValue(&I, DAG.getSetCC(MVT::i1, Op1, Op2, Opcode)); 5071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 5081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 5091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitSelect(User &I) { 5101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Cond = getValue(I.getOperand(0)); 5111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand TrueVal = getValue(I.getOperand(1)); 5121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand FalseVal = getValue(I.getOperand(2)); 5131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner setValue(&I, DAG.getNode(ISD::SELECT, TrueVal.getValueType(), Cond, 5141c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TrueVal, FalseVal)); 5151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 5161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 5171c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitCast(User &I) { 5181c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand N = getValue(I.getOperand(0)); 5191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType SrcTy = TLI.getValueType(I.getOperand(0)->getType()); 5201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType DestTy = TLI.getValueType(I.getType()); 5211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 5221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (N.getValueType() == DestTy) { 5231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner setValue(&I, N); // noop cast. 524ef311aa7cf26ae0cbb6e784d767801b9058dd24bChris Lattner } else if (DestTy == MVT::i1) { 525ef311aa7cf26ae0cbb6e784d767801b9058dd24bChris Lattner // Cast to bool is a comparison against zero, not truncation to zero. 526ef311aa7cf26ae0cbb6e784d767801b9058dd24bChris Lattner SDOperand Zero = isInteger(SrcTy) ? DAG.getConstant(0, N.getValueType()) : 527ef311aa7cf26ae0cbb6e784d767801b9058dd24bChris Lattner DAG.getConstantFP(0.0, N.getValueType()); 5287cf7e3f33f25544d08492d47cc8a1cbba25dc8d7Chris Lattner setValue(&I, DAG.getSetCC(MVT::i1, N, Zero, ISD::SETNE)); 529ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner } else if (isInteger(SrcTy)) { 530ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (isInteger(DestTy)) { // Int -> Int cast 531ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (DestTy < SrcTy) // Truncating cast? 532ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::TRUNCATE, DestTy, N)); 533ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner else if (I.getOperand(0)->getType()->isSigned()) 534ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::SIGN_EXTEND, DestTy, N)); 535ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner else 536ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::ZERO_EXTEND, DestTy, N)); 537ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner } else { // Int -> FP cast 538ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (I.getOperand(0)->getType()->isSigned()) 539ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::SINT_TO_FP, DestTy, N)); 540ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner else 541ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::UINT_TO_FP, DestTy, N)); 542ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner } 5431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else { 544ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner assert(isFloatingPoint(SrcTy) && "Unknown value type!"); 545ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (isFloatingPoint(DestTy)) { // FP -> FP cast 546ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (DestTy < SrcTy) // Rounding cast? 547ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::FP_ROUND, DestTy, N)); 548ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner else 549ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::FP_EXTEND, DestTy, N)); 550ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner } else { // FP -> Int cast. 551ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner if (I.getType()->isSigned()) 552ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::FP_TO_SINT, DestTy, N)); 553ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner else 554ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner setValue(&I, DAG.getNode(ISD::FP_TO_UINT, DestTy, N)); 555ae0aacb8331e1227abea6601e531a10d0e65fdcaChris Lattner } 5561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 5571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 5581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 5591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitGetElementPtr(User &I) { 5601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand N = getValue(I.getOperand(0)); 5611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const Type *Ty = I.getOperand(0)->getType(); 5621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const Type *UIntPtrTy = TD.getIntPtrType(); 5631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 5641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (GetElementPtrInst::op_iterator OI = I.op_begin()+1, E = I.op_end(); 5651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner OI != E; ++OI) { 5661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Value *Idx = *OI; 5671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (const StructType *StTy = dyn_cast<StructType> (Ty)) { 5681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned Field = cast<ConstantUInt>(Idx)->getValue(); 5691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Field) { 5701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // N = N + Offset 5711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner uint64_t Offset = TD.getStructLayout(StTy)->MemberOffsets[Field]; 5721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner N = DAG.getNode(ISD::ADD, N.getValueType(), N, 573dedf2bd5a34dac25e4245f58bb902ced6b64edd9Misha Brukman getIntPtrConstant(Offset)); 5741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 5751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Ty = StTy->getElementType(Field); 5761c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } else { 5771c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Ty = cast<SequentialType>(Ty)->getElementType(); 5781c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (!isa<Constant>(Idx) || !cast<Constant>(Idx)->isNullValue()) { 5791c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // N = N + Idx * ElementSize; 5801c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner uint64_t ElementSize = TD.getTypeSize(Ty); 5817cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner SDOperand IdxN = getValue(Idx), Scale = getIntPtrConstant(ElementSize); 5827cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner 5837cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner // If the index is smaller or larger than intptr_t, truncate or extend 5847cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner // it. 5857cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner if (IdxN.getValueType() < Scale.getValueType()) { 5867cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner if (Idx->getType()->isSigned()) 5877cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner IdxN = DAG.getNode(ISD::SIGN_EXTEND, Scale.getValueType(), IdxN); 5887cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner else 5897cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner IdxN = DAG.getNode(ISD::ZERO_EXTEND, Scale.getValueType(), IdxN); 5907cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner } else if (IdxN.getValueType() > Scale.getValueType()) 5917cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner IdxN = DAG.getNode(ISD::TRUNCATE, Scale.getValueType(), IdxN); 5927cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner 5937cc4777a263f6a52877d29201311fde5f6edb632Chris Lattner IdxN = DAG.getNode(ISD::MUL, N.getValueType(), IdxN, Scale); 5941c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner N = DAG.getNode(ISD::ADD, N.getValueType(), N, IdxN); 5951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 5961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 5971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 5981c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner setValue(&I, N); 5991c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 6001c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6011c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitAlloca(AllocaInst &I) { 6021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If this is a fixed sized alloca in the entry block of the function, 6031c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // allocate it statically on the stack. 6041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (FuncInfo.StaticAllocaMap.count(&I)) 6051c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return; // getValue will auto-populate this. 6061c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner const Type *Ty = I.getAllocatedType(); 6081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner uint64_t TySize = TLI.getTargetData().getTypeSize(Ty); 6091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned Align = TLI.getTargetData().getTypeAlignment(Ty); 6101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand AllocSize = getValue(I.getArraySize()); 61268cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner MVT::ValueType IntPtr = TLI.getPointerTy(); 61368cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner if (IntPtr < AllocSize.getValueType()) 61468cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner AllocSize = DAG.getNode(ISD::TRUNCATE, IntPtr, AllocSize); 61568cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner else if (IntPtr > AllocSize.getValueType()) 61668cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner AllocSize = DAG.getNode(ISD::ZERO_EXTEND, IntPtr, AllocSize); 6171c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 61868cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner AllocSize = DAG.getNode(ISD::MUL, IntPtr, AllocSize, 6191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner getIntPtrConstant(TySize)); 6201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Handle alignment. If the requested alignment is less than or equal to the 6221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // stack alignment, ignore it and round the size of the allocation up to the 6231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // stack alignment size. If the size is greater than the stack alignment, we 6241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // note this in the DYNAMIC_STACKALLOC node. 6251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner unsigned StackAlign = 6261c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TLI.getTargetMachine().getFrameInfo()->getStackAlignment(); 6271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Align <= StackAlign) { 6281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Align = 0; 6291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Add SA-1 to the size. 6301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner AllocSize = DAG.getNode(ISD::ADD, AllocSize.getValueType(), AllocSize, 6311c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner getIntPtrConstant(StackAlign-1)); 6321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Mask out the low bits for alignment purposes. 6331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner AllocSize = DAG.getNode(ISD::AND, AllocSize.getValueType(), AllocSize, 6341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner getIntPtrConstant(~(uint64_t)(StackAlign-1))); 6351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 6361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 637adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner std::vector<MVT::ValueType> VTs; 638adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner VTs.push_back(AllocSize.getValueType()); 639adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner VTs.push_back(MVT::Other); 640adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner std::vector<SDOperand> Ops; 641adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner Ops.push_back(getRoot()); 642adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner Ops.push_back(AllocSize); 643adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner Ops.push_back(getIntPtrConstant(Align)); 644adf6c2a0cb638e8b211200b57b927d16f6e1cfc4Chris Lattner SDOperand DSA = DAG.getNode(ISD::DYNAMIC_STACKALLOC, VTs, Ops); 6451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DAG.setRoot(setValue(&I, DSA).getValue(1)); 6461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Inform the Frame Information that we have just allocated a variable-sized 6481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // object. 6491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner CurMBB->getParent()->getFrameInfo()->CreateVariableSizedObject(); 6501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 6511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitLoad(LoadInst &I) { 6541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Ptr = getValue(I.getOperand(0)); 655edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 656d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner SDOperand Root; 657d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner if (I.isVolatile()) 658d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner Root = getRoot(); 659d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner else { 660d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner // Do not serialize non-volatile loads against each other. 661d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner Root = DAG.getRoot(); 662d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner } 663d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner 664369e6db9b6033bb60519b0ad84afeacc9ec9b416Chris Lattner SDOperand L = DAG.getLoad(TLI.getValueType(I.getType()), Root, Ptr, 66506ef88472f7bac3512e224974e87a0a456471b82Andrew Lenharth DAG.getSrcValue(I.getOperand(0))); 666d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner setValue(&I, L); 667d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner 668d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner if (I.isVolatile()) 669d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner DAG.setRoot(L.getValue(1)); 670d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner else 671d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner PendingLoads.push_back(L.getValue(1)); 6721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 6731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6741c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6751c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitStore(StoreInst &I) { 6761c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Value *SrcV = I.getOperand(0); 6771c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Src = getValue(SrcV); 6781c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Ptr = getValue(I.getOperand(1)); 679369e6db9b6033bb60519b0ad84afeacc9ec9b416Chris Lattner DAG.setRoot(DAG.getNode(ISD::STORE, MVT::Other, getRoot(), Src, Ptr, 68006ef88472f7bac3512e224974e87a0a456471b82Andrew Lenharth DAG.getSrcValue(I.getOperand(1)))); 6811c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 6821c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 6831c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitCall(CallInst &I) { 68464e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner const char *RenameFn = 0; 685d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner SDOperand Tmp; 6861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (Function *F = I.getCalledFunction()) 687c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner if (F->isExternal()) 688c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner switch (F->getIntrinsicID()) { 689c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case 0: // Not an LLVM intrinsic. 690c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner if (F->getName() == "fabs" || F->getName() == "fabsf") { 691c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner if (I.getNumOperands() == 2 && // Basic sanity checks. 692c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner I.getOperand(1)->getType()->isFloatingPoint() && 693c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner I.getType() == I.getOperand(1)->getType()) { 694d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner Tmp = getValue(I.getOperand(1)); 695c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner setValue(&I, DAG.getNode(ISD::FABS, Tmp.getValueType(), Tmp)); 696c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner return; 697c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner } 698c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner } 699f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner else if (F->getName() == "sin" || F->getName() == "sinf") { 700f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner if (I.getNumOperands() == 2 && // Basic sanity checks. 701f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner I.getOperand(1)->getType()->isFloatingPoint() && 702f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner I.getType() == I.getOperand(1)->getType()) { 703d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner Tmp = getValue(I.getOperand(1)); 704f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner setValue(&I, DAG.getNode(ISD::FSIN, Tmp.getValueType(), Tmp)); 705f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner return; 706f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner } 707f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner } 708f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner else if (F->getName() == "cos" || F->getName() == "cosf") { 709f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner if (I.getNumOperands() == 2 && // Basic sanity checks. 710f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner I.getOperand(1)->getType()->isFloatingPoint() && 711f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner I.getType() == I.getOperand(1)->getType()) { 712d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner Tmp = getValue(I.getOperand(1)); 713f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner setValue(&I, DAG.getNode(ISD::FCOS, Tmp.getValueType(), Tmp)); 714f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner return; 715f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner } 716f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner } 717c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner break; 718c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::vastart: visitVAStart(I); return; 719c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::vaend: visitVAEnd(I); return; 720c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::vacopy: visitVACopy(I); return; 721c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::returnaddress: visitFrameReturnAddress(I, false); return; 722c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::frameaddress: visitFrameReturnAddress(I, true); return; 723d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner 724c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::setjmp: RenameFn = "setjmp"; break; 725c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::longjmp: RenameFn = "longjmp"; break; 726c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::memcpy: visitMemIntrinsic(I, ISD::MEMCPY); return; 727c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::memset: visitMemIntrinsic(I, ISD::MEMSET); return; 728c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::memmove: visitMemIntrinsic(I, ISD::MEMMOVE); return; 729edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 730d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner case Intrinsic::readport: 7311ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner case Intrinsic::readio: { 7321ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner std::vector<MVT::ValueType> VTs; 7331ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner VTs.push_back(TLI.getValueType(I.getType())); 7341ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner VTs.push_back(MVT::Other); 7351ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner std::vector<SDOperand> Ops; 7361ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner Ops.push_back(getRoot()); 7371ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner Ops.push_back(getValue(I.getOperand(1))); 738d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner Tmp = DAG.getNode(F->getIntrinsicID() == Intrinsic::readport ? 7391ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner ISD::READPORT : ISD::READIO, VTs, Ops); 74000b16889ab461b7ecef1c91ade101186b7f1fce2Jeff Cohen 741d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner setValue(&I, Tmp); 742d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner DAG.setRoot(Tmp.getValue(1)); 743d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner return; 7441ca85d567c8860a8a7cf0730107f4ee701fa4fd0Chris Lattner } 745d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner case Intrinsic::writeport: 746d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner case Intrinsic::writeio: 747d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner DAG.setRoot(DAG.getNode(F->getIntrinsicID() == Intrinsic::writeport ? 748d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner ISD::WRITEPORT : ISD::WRITEIO, MVT::Other, 749d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner getRoot(), getValue(I.getOperand(1)), 750d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner getValue(I.getOperand(2)))); 751d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner return; 7527ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner case Intrinsic::dbg_stoppoint: 7537ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner case Intrinsic::dbg_region_start: 7547ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner case Intrinsic::dbg_region_end: 7557ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner case Intrinsic::dbg_func_start: 7567ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner case Intrinsic::dbg_declare: 7577ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner if (I.getType() != Type::VoidTy) 7587ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner setValue(&I, DAG.getNode(ISD::UNDEF, TLI.getValueType(I.getType()))); 7597ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner return; 7607ea0ade1b6a16b5836645b61da671715180ab039Chris Lattner 761c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner case Intrinsic::isunordered: 7627cf7e3f33f25544d08492d47cc8a1cbba25dc8d7Chris Lattner setValue(&I, DAG.getSetCC(MVT::i1,getValue(I.getOperand(1)), 7637cf7e3f33f25544d08492d47cc8a1cbba25dc8d7Chris Lattner getValue(I.getOperand(2)), ISD::SETUO)); 764c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner return; 765f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner 766f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner case Intrinsic::sqrt: 767f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner setValue(&I, DAG.getNode(ISD::FSQRT, 768f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner getValue(I.getOperand(1)).getValueType(), 769f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner getValue(I.getOperand(1)))); 770f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner return; 771f76e7dc8d8ac1855ef59698e82c757548ef4ca65Chris Lattner 772d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner case Intrinsic::pcmarker: 773d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner Tmp = getValue(I.getOperand(1)); 774d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner DAG.setRoot(DAG.getNode(ISD::PCMARKER, MVT::Other, getRoot(), Tmp)); 775c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner return; 776691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth case Intrinsic::cttz: 777691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth setValue(&I, DAG.getNode(ISD::CTTZ, 778691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth getValue(I.getOperand(1)).getValueType(), 779691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth getValue(I.getOperand(1)))); 780691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth return; 781691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth case Intrinsic::ctlz: 782691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth setValue(&I, DAG.getNode(ISD::CTLZ, 783691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth getValue(I.getOperand(1)).getValueType(), 784691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth getValue(I.getOperand(1)))); 785691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth return; 786691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth case Intrinsic::ctpop: 787691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth setValue(&I, DAG.getNode(ISD::CTPOP, 788691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth getValue(I.getOperand(1)).getValueType(), 789691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth getValue(I.getOperand(1)))); 790691ef2ba066dda14ae4ac0ad645054fbc967785aAndrew Lenharth return; 791d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner default: 792d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner std::cerr << I; 793d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner assert(0 && "This intrinsic is not implemented yet!"); 794d0f6c1f52dddf11701406c31fd3e9448314a8366Chris Lattner return; 795c0f18152d94bf65061fab4b80869998cfb0439e1Chris Lattner } 796edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 79764e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner SDOperand Callee; 79864e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner if (!RenameFn) 79964e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner Callee = getValue(I.getOperand(0)); 80064e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner else 80164e14b1679fa3649b286402ea254d663ac43ef91Chris Lattner Callee = DAG.getExternalSymbol(RenameFn, TLI.getPointerTy()); 8021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::vector<std::pair<SDOperand, const Type*> > Args; 803edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 8041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (unsigned i = 1, e = I.getNumOperands(); i != e; ++i) { 8051c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Value *Arg = I.getOperand(i); 8061c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand ArgNode = getValue(Arg); 8071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Args.push_back(std::make_pair(ArgNode, Arg->getType())); 8081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 809edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 8108e21e71b248365c69c0f666518c378b5819ce6fbNate Begeman const PointerType *PT = cast<PointerType>(I.getCalledValue()->getType()); 8118e21e71b248365c69c0f666518c378b5819ce6fbNate Begeman const FunctionType *FTy = cast<FunctionType>(PT->getElementType()); 812edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 813cf5734dddd66af9388a171b44996505ede47feedChris Lattner std::pair<SDOperand,SDOperand> Result = 8149092fa310c8b2b1645b0d448c4c34b1e8ddc131dChris Lattner TLI.LowerCallTo(getRoot(), I.getType(), FTy->isVarArg(), I.getCallingConv(), 815adf6a965a321372c640845407195594835921eb4Chris Lattner I.isTailCall(), Callee, Args, DAG); 8161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (I.getType() != Type::VoidTy) 817cf5734dddd66af9388a171b44996505ede47feedChris Lattner setValue(&I, Result.first); 818cf5734dddd66af9388a171b44996505ede47feedChris Lattner DAG.setRoot(Result.second); 8191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 8201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 8211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitMalloc(MallocInst &I) { 8221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDOperand Src = getValue(I.getOperand(0)); 8231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 8241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType IntPtr = TLI.getPointerTy(); 82568cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner 82668cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner if (IntPtr < Src.getValueType()) 82768cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner Src = DAG.getNode(ISD::TRUNCATE, IntPtr, Src); 82868cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner else if (IntPtr > Src.getValueType()) 82968cd65ea689907fb8a4aa80d72d182921e94607fChris Lattner Src = DAG.getNode(ISD::ZERO_EXTEND, IntPtr, Src); 8301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 8311c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Scale the source by the type size. 8321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner uint64_t ElementSize = TD.getTypeSize(I.getType()->getElementType()); 8331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Src = DAG.getNode(ISD::MUL, Src.getValueType(), 8341c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Src, getIntPtrConstant(ElementSize)); 8351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 8361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::vector<std::pair<SDOperand, const Type*> > Args; 8371c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Args.push_back(std::make_pair(Src, TLI.getTargetData().getIntPtrType())); 838cf5734dddd66af9388a171b44996505ede47feedChris Lattner 839cf5734dddd66af9388a171b44996505ede47feedChris Lattner std::pair<SDOperand,SDOperand> Result = 840adf6a965a321372c640845407195594835921eb4Chris Lattner TLI.LowerCallTo(getRoot(), I.getType(), false, CallingConv::C, true, 841cf5734dddd66af9388a171b44996505ede47feedChris Lattner DAG.getExternalSymbol("malloc", IntPtr), 842cf5734dddd66af9388a171b44996505ede47feedChris Lattner Args, DAG); 843cf5734dddd66af9388a171b44996505ede47feedChris Lattner setValue(&I, Result.first); // Pointers always fit in registers 844cf5734dddd66af9388a171b44996505ede47feedChris Lattner DAG.setRoot(Result.second); 8451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 8461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 8471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitFree(FreeInst &I) { 8481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::vector<std::pair<SDOperand, const Type*> > Args; 8491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner Args.push_back(std::make_pair(getValue(I.getOperand(0)), 8501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TLI.getTargetData().getIntPtrType())); 8511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MVT::ValueType IntPtr = TLI.getPointerTy(); 852cf5734dddd66af9388a171b44996505ede47feedChris Lattner std::pair<SDOperand,SDOperand> Result = 853adf6a965a321372c640845407195594835921eb4Chris Lattner TLI.LowerCallTo(getRoot(), Type::VoidTy, false, CallingConv::C, true, 854cf5734dddd66af9388a171b44996505ede47feedChris Lattner DAG.getExternalSymbol("free", IntPtr), Args, DAG); 855cf5734dddd66af9388a171b44996505ede47feedChris Lattner DAG.setRoot(Result.second); 8561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 8571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 858e64e72b794cfa385372436b3c88460aeee0acbf6Chris LattnerSDOperand TargetLowering::LowerVAStart(SDOperand Chain, 859e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SDOperand VAListP, Value *VAListV, 860e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SelectionDAG &DAG) { 8611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // We have no sane default behavior, just emit a useful error message and bail 8621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // out. 86339ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner std::cerr << "Variable arguments handling not implemented on this target!\n"; 8641c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner abort(); 865e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner return SDOperand(); 8661c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 8671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 868e64e72b794cfa385372436b3c88460aeee0acbf6Chris LattnerSDOperand TargetLowering::LowerVAEnd(SDOperand Chain, SDOperand LP, Value *LV, 86939ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner SelectionDAG &DAG) { 87039ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner // Default to a noop. 87139ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner return Chain; 87239ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner} 87339ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner 874e64e72b794cfa385372436b3c88460aeee0acbf6Chris LattnerSDOperand TargetLowering::LowerVACopy(SDOperand Chain, 875e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SDOperand SrcP, Value *SrcV, 876e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SDOperand DestP, Value *DestV, 877e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SelectionDAG &DAG) { 878e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner // Default to copying the input list. 879e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SDOperand Val = DAG.getLoad(getPointerTy(), Chain, 880e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SrcP, DAG.getSrcValue(SrcV)); 881213e557cef3e653e2d3a00b07b137c143128430aAndrew Lenharth SDOperand Result = DAG.getNode(ISD::STORE, MVT::Other, Val.getValue(1), 882e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner Val, DestP, DAG.getSrcValue(DestV)); 883e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner return Result; 88439ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner} 88539ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner 88639ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattnerstd::pair<SDOperand,SDOperand> 887e64e72b794cfa385372436b3c88460aeee0acbf6Chris LattnerTargetLowering::LowerVAArg(SDOperand Chain, SDOperand VAListP, Value *VAListV, 888e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner const Type *ArgTy, SelectionDAG &DAG) { 8891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // We have no sane default behavior, just emit a useful error message and bail 8901c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // out. 89139ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner std::cerr << "Variable arguments handling not implemented on this target!\n"; 8921c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner abort(); 893d3f03e4b50feb6abfa9fec8b0aa705d45134c59eMisha Brukman return std::make_pair(SDOperand(), SDOperand()); 8941c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 89539ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner 89639ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner 89739ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattnervoid SelectionDAGLowering::visitVAStart(CallInst &I) { 898e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner DAG.setRoot(TLI.LowerVAStart(getRoot(), getValue(I.getOperand(1)), 899e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner I.getOperand(1), DAG)); 90039ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner} 90139ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner 9021c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitVAArg(VAArgInst &I) { 90339ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner std::pair<SDOperand,SDOperand> Result = 904e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner TLI.LowerVAArg(getRoot(), getValue(I.getOperand(0)), I.getOperand(0), 905558bc88a00930fce283b240b7c9555f649a18f1bAndrew Lenharth I.getType(), DAG); 90639ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner setValue(&I, Result.first); 90739ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner DAG.setRoot(Result.second); 9081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 9091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitVAEnd(CallInst &I) { 91100b16889ab461b7ecef1c91ade101186b7f1fce2Jeff Cohen DAG.setRoot(TLI.LowerVAEnd(getRoot(), getValue(I.getOperand(1)), 912e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner I.getOperand(1), DAG)); 9131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 9141c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGLowering::visitVACopy(CallInst &I) { 916e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner SDOperand Result = 917e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner TLI.LowerVACopy(getRoot(), getValue(I.getOperand(2)), I.getOperand(2), 918e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner getValue(I.getOperand(1)), I.getOperand(1), DAG); 919e64e72b794cfa385372436b3c88460aeee0acbf6Chris Lattner DAG.setRoot(Result); 9201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 9211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 92339ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner// It is always conservatively correct for llvm.returnaddress and 92439ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner// llvm.frameaddress to return 0. 92539ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattnerstd::pair<SDOperand, SDOperand> 92639ae3622791986a0232f7e4797b633f8fa9e54d2Chris LattnerTargetLowering::LowerFrameReturnAddress(bool isFrameAddr, SDOperand Chain, 92739ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner unsigned Depth, SelectionDAG &DAG) { 92839ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner return std::make_pair(DAG.getConstant(0, getPointerTy()), Chain); 9291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 9301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 93150381b6c4180e9a2b983d4623da2e485cd768632Chris LattnerSDOperand TargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) { 932171453a284b097f1ee89fb87ff495c3a6c7b6297Chris Lattner assert(0 && "LowerOperation not implemented for this target!"); 933171453a284b097f1ee89fb87ff495c3a6c7b6297Chris Lattner abort(); 934d3f03e4b50feb6abfa9fec8b0aa705d45134c59eMisha Brukman return SDOperand(); 935171453a284b097f1ee89fb87ff495c3a6c7b6297Chris Lattner} 936171453a284b097f1ee89fb87ff495c3a6c7b6297Chris Lattner 93739ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattnervoid SelectionDAGLowering::visitFrameReturnAddress(CallInst &I, bool isFrame) { 93839ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner unsigned Depth = (unsigned)cast<ConstantUInt>(I.getOperand(1))->getValue(); 93939ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner std::pair<SDOperand,SDOperand> Result = 940a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner TLI.LowerFrameReturnAddress(isFrame, getRoot(), Depth, DAG); 94139ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner setValue(&I, Result.first); 94239ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner DAG.setRoot(Result.second); 94339ae3622791986a0232f7e4797b633f8fa9e54d2Chris Lattner} 9441c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9457041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattnervoid SelectionDAGLowering::visitMemIntrinsic(CallInst &I, unsigned Op) { 9467041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner std::vector<SDOperand> Ops; 947a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner Ops.push_back(getRoot()); 9487041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner Ops.push_back(getValue(I.getOperand(1))); 9497041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner Ops.push_back(getValue(I.getOperand(2))); 9507041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner Ops.push_back(getValue(I.getOperand(3))); 9517041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner Ops.push_back(getValue(I.getOperand(4))); 9527041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner DAG.setRoot(DAG.getNode(Op, MVT::Other, Ops)); 9531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 9541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9557041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner//===----------------------------------------------------------------------===// 9567041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner// SelectionDAGISel code 9577041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner//===----------------------------------------------------------------------===// 9581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerunsigned SelectionDAGISel::MakeReg(MVT::ValueType VT) { 9601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return RegMap->createVirtualRegister(TLI.getRegClassFor(VT)); 9611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 9621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 963495a0b51915eb763576874f29192820b731edc22Chris Lattnervoid SelectionDAGISel::getAnalysisUsage(AnalysisUsage &AU) const { 96436b708f05720c407f5e5657f2fd4b0677702ad46Chris Lattner // FIXME: we only modify the CFG to split critical edges. This 96536b708f05720c407f5e5657f2fd4b0677702ad46Chris Lattner // updates dom and loop info. 966495a0b51915eb763576874f29192820b731edc22Chris Lattner} 9671c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9681c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9691c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerbool SelectionDAGISel::runOnFunction(Function &Fn) { 9701c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineFunction &MF = MachineFunction::construct(&Fn, TLI.getTargetMachine()); 9711c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner RegMap = MF.getSSARegMap(); 9721c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(std::cerr << "\n\n\n=== " << Fn.getName() << "\n"); 9731c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 974495a0b51915eb763576874f29192820b731edc22Chris Lattner // First pass, split all critical edges for PHI nodes with incoming values 975495a0b51915eb763576874f29192820b731edc22Chris Lattner // that are constants, this way the load of the constant into a vreg will not 976495a0b51915eb763576874f29192820b731edc22Chris Lattner // be placed into MBBs that are used some other way. 97736b708f05720c407f5e5657f2fd4b0677702ad46Chris Lattner for (Function::iterator BB = Fn.begin(), E = Fn.end(); BB != E; ++BB) { 97836b708f05720c407f5e5657f2fd4b0677702ad46Chris Lattner PHINode *PN; 97936b708f05720c407f5e5657f2fd4b0677702ad46Chris Lattner for (BasicBlock::iterator BBI = BB->begin(); 98036b708f05720c407f5e5657f2fd4b0677702ad46Chris Lattner (PN = dyn_cast<PHINode>(BBI)); ++BBI) 98136b708f05720c407f5e5657f2fd4b0677702ad46Chris Lattner for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) 98236b708f05720c407f5e5657f2fd4b0677702ad46Chris Lattner if (isa<Constant>(PN->getIncomingValue(i))) 98336b708f05720c407f5e5657f2fd4b0677702ad46Chris Lattner SplitCriticalEdge(PN->getIncomingBlock(i), BB); 98436b708f05720c407f5e5657f2fd4b0677702ad46Chris Lattner } 985495a0b51915eb763576874f29192820b731edc22Chris Lattner 9861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FunctionLoweringInfo FuncInfo(TLI, Fn, MF); 9871c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9881c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (Function::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I) 9891c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SelectBasicBlock(I, MF, FuncInfo); 990edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 9911c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return true; 9921c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 9931c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 9941c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 995ddb870b065984007a0df645ad97c6ad6a6f12de0Chris LattnerSDOperand SelectionDAGISel:: 996ddb870b065984007a0df645ad97c6ad6a6f12de0Chris LattnerCopyValueToVirtualRegister(SelectionDAGLowering &SDL, Value *V, unsigned Reg) { 997f1fdacae8c1bd9e5ff4619546b3a28e93fb75ab5Chris Lattner SDOperand Op = SDL.getValue(V); 99818c2f13e0f9d0e5d6227cf6d1881e9ee3d1b6109Chris Lattner assert((Op.getOpcode() != ISD::CopyFromReg || 999d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner cast<RegisterSDNode>(Op.getOperand(1))->getReg() != Reg) && 100018c2f13e0f9d0e5d6227cf6d1881e9ee3d1b6109Chris Lattner "Copy from a reg to the same reg!"); 1001d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner 1002d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // If this type is not legal, we must make sure to not create an invalid 1003d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // register use. 1004d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner MVT::ValueType SrcVT = Op.getValueType(); 1005d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner MVT::ValueType DestVT = TLI.getTypeToTransformTo(SrcVT); 1006d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner SelectionDAG &DAG = SDL.DAG; 1007d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner if (SrcVT == DestVT) { 1008d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner return DAG.getCopyToReg(SDL.getRoot(), Reg, Op); 1009d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner } else if (SrcVT < DestVT) { 1010d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // The src value is promoted to the register. 1011fae59b99b8d1942f30a4be609423282c3fd62dd8Chris Lattner if (MVT::isFloatingPoint(SrcVT)) 1012fae59b99b8d1942f30a4be609423282c3fd62dd8Chris Lattner Op = DAG.getNode(ISD::FP_EXTEND, DestVT, Op); 1013fae59b99b8d1942f30a4be609423282c3fd62dd8Chris Lattner else 1014fae59b99b8d1942f30a4be609423282c3fd62dd8Chris Lattner Op = DAG.getNode(ISD::ZERO_EXTEND, DestVT, Op); 1015d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner return DAG.getCopyToReg(SDL.getRoot(), Reg, Op); 1016d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner } else { 1017d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner // The src value is expanded into multiple registers. 1018d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, DestVT, 1019d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner Op, DAG.getConstant(0, MVT::i32)); 1020d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, DestVT, 1021d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner Op, DAG.getConstant(1, MVT::i32)); 1022d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner Op = DAG.getCopyToReg(SDL.getRoot(), Reg, Lo); 1023d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner return DAG.getCopyToReg(Op, Reg+1, Hi); 1024d5d0f9bd20d9df07d6b4d41b7e8ed6d33b6a649dChris Lattner } 10251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 10261c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 10270afa8e348eab21d3e09ae3240544886d61879266Chris Lattner/// IsOnlyUsedInOneBasicBlock - If the specified argument is only used in a 10280afa8e348eab21d3e09ae3240544886d61879266Chris Lattner/// single basic block, return that block. Otherwise, return a null pointer. 10290afa8e348eab21d3e09ae3240544886d61879266Chris Lattnerstatic BasicBlock *IsOnlyUsedInOneBasicBlock(Argument *A) { 10300afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (A->use_empty()) return 0; 10310afa8e348eab21d3e09ae3240544886d61879266Chris Lattner BasicBlock *BB = cast<Instruction>(A->use_back())->getParent(); 10320afa8e348eab21d3e09ae3240544886d61879266Chris Lattner for (Argument::use_iterator UI = A->use_begin(), E = A->use_end(); UI != E; 10330afa8e348eab21d3e09ae3240544886d61879266Chris Lattner ++UI) 10340afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (isa<PHINode>(*UI) || cast<Instruction>(*UI)->getParent() != BB) 10350afa8e348eab21d3e09ae3240544886d61879266Chris Lattner return 0; // Disagreement among the users? 1036aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner 1037aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner // Okay, there is a single BB user. Only permit this optimization if this is 1038aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner // the entry block, otherwise, we might sink argument loads into loops and 1039aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner // stuff. Later, when we have global instruction selection, this won't be an 1040aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner // issue clearly. 1041aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner if (BB == BB->getParent()->begin()) 1042aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner return BB; 1043aa781b34040f07db00fb4b59cb567e6ad9ef5861Chris Lattner return 0; 10440afa8e348eab21d3e09ae3240544886d61879266Chris Lattner} 10450afa8e348eab21d3e09ae3240544886d61879266Chris Lattner 1046068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattnervoid SelectionDAGISel:: 1047068a81e9fca511b9a3b3a0f28a8988a57f994652Chris LattnerLowerArguments(BasicBlock *BB, SelectionDAGLowering &SDL, 1048068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner std::vector<SDOperand> &UnorderedChains) { 10491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // If this is the entry block, emit arguments. 1050068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner Function &F = *BB->getParent(); 10510afa8e348eab21d3e09ae3240544886d61879266Chris Lattner FunctionLoweringInfo &FuncInfo = SDL.FuncInfo; 1052068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner 1053068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner if (BB == &F.front()) { 10540afa8e348eab21d3e09ae3240544886d61879266Chris Lattner SDOperand OldRoot = SDL.DAG.getRoot(); 10550afa8e348eab21d3e09ae3240544886d61879266Chris Lattner 1056068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner std::vector<SDOperand> Args = TLI.LowerArguments(F, SDL.DAG); 1057068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner 10580afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // If there were side effects accessing the argument list, do not do 10590afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // anything special. 10600afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (OldRoot != SDL.DAG.getRoot()) { 10610afa8e348eab21d3e09ae3240544886d61879266Chris Lattner unsigned a = 0; 1062a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner for (Function::arg_iterator AI = F.arg_begin(), E = F.arg_end(); 1063a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner AI != E; ++AI,++a) 10640afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (!AI->use_empty()) { 10650afa8e348eab21d3e09ae3240544886d61879266Chris Lattner SDL.setValue(AI, Args[a]); 1066edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman SDOperand Copy = 10670afa8e348eab21d3e09ae3240544886d61879266Chris Lattner CopyValueToVirtualRegister(SDL, AI, FuncInfo.ValueMap[AI]); 10680afa8e348eab21d3e09ae3240544886d61879266Chris Lattner UnorderedChains.push_back(Copy); 10690afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } 10700afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } else { 10710afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // Otherwise, if any argument is only accessed in a single basic block, 10720afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // emit that argument only to that basic block. 10730afa8e348eab21d3e09ae3240544886d61879266Chris Lattner unsigned a = 0; 1074a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner for (Function::arg_iterator AI = F.arg_begin(), E = F.arg_end(); 1075a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner AI != E; ++AI,++a) 10760afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (!AI->use_empty()) { 10770afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (BasicBlock *BBU = IsOnlyUsedInOneBasicBlock(AI)) { 10780afa8e348eab21d3e09ae3240544886d61879266Chris Lattner FuncInfo.BlockLocalArguments.insert(std::make_pair(BBU, 10790afa8e348eab21d3e09ae3240544886d61879266Chris Lattner std::make_pair(AI, a))); 10800afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } else { 10810afa8e348eab21d3e09ae3240544886d61879266Chris Lattner SDL.setValue(AI, Args[a]); 1082edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman SDOperand Copy = 10830afa8e348eab21d3e09ae3240544886d61879266Chris Lattner CopyValueToVirtualRegister(SDL, AI, FuncInfo.ValueMap[AI]); 10840afa8e348eab21d3e09ae3240544886d61879266Chris Lattner UnorderedChains.push_back(Copy); 10850afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } 10860afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } 10870afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } 1088405ef9e28d955c1b107c27bedfd4be8b9165af01Chris Lattner 1089405ef9e28d955c1b107c27bedfd4be8b9165af01Chris Lattner EmitFunctionEntryCode(F, SDL.DAG.getMachineFunction()); 10900afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } 10911c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 10920afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // See if there are any block-local arguments that need to be emitted in this 10930afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // block. 10940afa8e348eab21d3e09ae3240544886d61879266Chris Lattner 10950afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (!FuncInfo.BlockLocalArguments.empty()) { 10960afa8e348eab21d3e09ae3240544886d61879266Chris Lattner std::multimap<BasicBlock*, std::pair<Argument*, unsigned> >::iterator BLAI = 10970afa8e348eab21d3e09ae3240544886d61879266Chris Lattner FuncInfo.BlockLocalArguments.lower_bound(BB); 10980afa8e348eab21d3e09ae3240544886d61879266Chris Lattner if (BLAI != FuncInfo.BlockLocalArguments.end() && BLAI->first == BB) { 10990afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // Lower the arguments into this block. 11000afa8e348eab21d3e09ae3240544886d61879266Chris Lattner std::vector<SDOperand> Args = TLI.LowerArguments(F, SDL.DAG); 1101edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 11020afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // Set up the value mapping for the local arguments. 11030afa8e348eab21d3e09ae3240544886d61879266Chris Lattner for (; BLAI != FuncInfo.BlockLocalArguments.end() && BLAI->first == BB; 11040afa8e348eab21d3e09ae3240544886d61879266Chris Lattner ++BLAI) 11050afa8e348eab21d3e09ae3240544886d61879266Chris Lattner SDL.setValue(BLAI->second.first, Args[BLAI->second.second]); 1106edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 11070afa8e348eab21d3e09ae3240544886d61879266Chris Lattner // Any dead arguments will just be ignored here. 11080afa8e348eab21d3e09ae3240544886d61879266Chris Lattner } 11091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1110068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner} 1111068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner 1112068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner 1113068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattnervoid SelectionDAGISel::BuildSelectionDAG(SelectionDAG &DAG, BasicBlock *LLVMBB, 1114068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner std::vector<std::pair<MachineInstr*, unsigned> > &PHINodesToUpdate, 1115068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner FunctionLoweringInfo &FuncInfo) { 1116068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner SelectionDAGLowering SDL(DAG, TLI, FuncInfo); 1117068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner 1118068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner std::vector<SDOperand> UnorderedChains; 1119edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 1120068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner // Lower any arguments needed in this block. 1121068a81e9fca511b9a3b3a0f28a8988a57f994652Chris Lattner LowerArguments(LLVMBB, SDL, UnorderedChains); 11221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner BB = FuncInfo.MBBMap[LLVMBB]; 11241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDL.setCurrentBasicBlock(BB); 11251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11261c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Lower all of the non-terminator instructions. 11271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (BasicBlock::iterator I = LLVMBB->begin(), E = --LLVMBB->end(); 11281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner I != E; ++I) 11291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDL.visit(*I); 11301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11311c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Ensure that all instructions which are used outside of their defining 11321c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // blocks are available as virtual registers. 11331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (BasicBlock::iterator I = LLVMBB->begin(), E = LLVMBB->end(); I != E;++I) 1134f1fdacae8c1bd9e5ff4619546b3a28e93fb75ab5Chris Lattner if (!I->use_empty() && !isa<PHINode>(I)) { 1135ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner std::map<const Value*, unsigned>::iterator VMI =FuncInfo.ValueMap.find(I); 11361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner if (VMI != FuncInfo.ValueMap.end()) 1137ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner UnorderedChains.push_back( 1138ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner CopyValueToVirtualRegister(SDL, I, VMI->second)); 11391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 11401c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11411c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Handle PHI nodes in successor blocks. Emit code into the SelectionDAG to 11421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // ensure constants are generated when needed. Remember the virtual registers 11431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // that need to be added to the Machine PHI nodes as input. We cannot just 11441c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // directly add them, because expansion might result in multiple MBB's for one 11451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // BB. As such, the start of the BB might correspond to a different MBB than 11461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // the end. 1147edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman // 11481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Emit constants only once even if used by multiple PHI nodes. 11501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::map<Constant*, unsigned> ConstantsOut; 11511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Check successor nodes PHI nodes that expect a constant to be available from 11531c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // this block. 11541c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner TerminatorInst *TI = LLVMBB->getTerminator(); 11551c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (unsigned succ = 0, e = TI->getNumSuccessors(); succ != e; ++succ) { 11561c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner BasicBlock *SuccBB = TI->getSuccessor(succ); 11571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineBasicBlock::iterator MBBI = FuncInfo.MBBMap[SuccBB]->begin(); 11581c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner PHINode *PN; 11591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 11601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // At this point we know that there is a 1-1 correspondence between LLVM PHI 11611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // nodes and Machine PHI nodes, but the incoming operands have not been 11621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // emitted yet. 11631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (BasicBlock::iterator I = SuccBB->begin(); 1164f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner (PN = dyn_cast<PHINode>(I)); ++I) 1165f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner if (!PN->use_empty()) { 1166f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner unsigned Reg; 1167f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner Value *PHIOp = PN->getIncomingValueForBlock(LLVMBB); 1168f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner if (Constant *C = dyn_cast<Constant>(PHIOp)) { 1169f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner unsigned &RegOut = ConstantsOut[C]; 1170f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner if (RegOut == 0) { 1171f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner RegOut = FuncInfo.CreateRegForValue(C); 1172ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner UnorderedChains.push_back( 1173ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner CopyValueToVirtualRegister(SDL, C, RegOut)); 1174f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner } 1175f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner Reg = RegOut; 1176f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner } else { 1177f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner Reg = FuncInfo.ValueMap[PHIOp]; 1178ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner if (Reg == 0) { 1179edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman assert(isa<AllocaInst>(PHIOp) && 1180ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner FuncInfo.StaticAllocaMap.count(cast<AllocaInst>(PHIOp)) && 1181ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner "Didn't codegen value into a register!??"); 1182ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner Reg = FuncInfo.CreateRegForValue(PHIOp); 1183ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner UnorderedChains.push_back( 1184ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner CopyValueToVirtualRegister(SDL, PHIOp, Reg)); 1185ee749d7488bd42df0f67e2d80048c63415943785Chris Lattner } 11861c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1187edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 1188f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner // Remember that this register needs to added to the machine PHI node as 1189f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner // the input for this MBB. 1190f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner unsigned NumElements = 1191f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner TLI.getNumElements(TLI.getValueType(PN->getType())); 1192f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner for (unsigned i = 0, e = NumElements; i != e; ++i) 1193f44fd88e9cdd7b47acb71ac78e3dccb91319c72dChris Lattner PHINodesToUpdate.push_back(std::make_pair(MBBI++, Reg+i)); 11941c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 11951c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 11961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner ConstantsOut.clear(); 11971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1198ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner // Turn all of the unordered chains into one factored node. 11995a6c6d98d561df671350a56c8031a3611f1c46faChris Lattner if (!UnorderedChains.empty()) { 1200d3948116b81b11e82246c11389a9b4ce7e619fbbChris Lattner UnorderedChains.push_back(SDL.getRoot()); 1201ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other, UnorderedChains)); 1202ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner } 1203ddb870b065984007a0df645ad97c6ad6a6f12de0Chris Lattner 12041c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Lower the terminator after the copies are emitted. 12051c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner SDL.visit(*LLVMBB->getTerminator()); 1206a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner 1207a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner // Make sure the root of the DAG is up-to-date. 1208a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner DAG.setRoot(SDL.getRoot()); 12091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 12101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 12111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnervoid SelectionDAGISel::SelectBasicBlock(BasicBlock *LLVMBB, MachineFunction &MF, 12121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner FunctionLoweringInfo &FuncInfo) { 1213ac9dc08c7f0ae60c125624d72c3022025d79ee9eChris Lattner SelectionDAG DAG(TLI, MF); 12141c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner CurDAG = &DAG; 12151c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner std::vector<std::pair<MachineInstr*, unsigned> > PHINodesToUpdate; 12161c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 12171c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // First step, lower LLVM code to some DAG. This DAG may use operations and 12181c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // types that are not supported by the target. 12191c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner BuildSelectionDAG(DAG, LLVMBB, PHINodesToUpdate, FuncInfo); 12201c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 12211c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(std::cerr << "Lowered selection DAG:\n"); 12221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(DAG.dump()); 12231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 12241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Second step, hack on the DAG until it only uses operations and types that 12251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // the target supports. 1226ac9dc08c7f0ae60c125624d72c3022025d79ee9eChris Lattner DAG.Legalize(); 12271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 12281c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(std::cerr << "Legalized selection DAG:\n"); 12291c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(DAG.dump()); 12301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 123182cfa5d616ff0f760425cbf6e2983fbab618fbdaChris Lattner if (ViewDAGs) DAG.viewGraph(); 123282cfa5d616ff0f760425cbf6e2983fbab618fbdaChris Lattner 1233a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // Third, instruction select all of the operations to machine code, adding the 1234a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // code to the MachineBasicBlock. 12351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner InstructionSelectBasicBlock(DAG); 12361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 12371c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(std::cerr << "Selected machine code:\n"); 12381c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(BB->dump()); 12391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 1240a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // Next, now that we know what the last MBB the LLVM BB expanded is, update 12411c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // PHI nodes in successors. 12421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner for (unsigned i = 0, e = PHINodesToUpdate.size(); i != e; ++i) { 12431c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner MachineInstr *PHI = PHINodesToUpdate[i].first; 12441c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner assert(PHI->getOpcode() == TargetInstrInfo::PHI && 12451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner "This is not a machine PHI node that we are updating!"); 12461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner PHI->addRegOperand(PHINodesToUpdate[i].second); 12471c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner PHI->addMachineBasicBlockOperand(BB); 12481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 1249a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner 1250a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // Finally, add the CFG edges from the last selected MBB to the successor 1251a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // MBBs. 1252a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner TerminatorInst *TI = LLVMBB->getTerminator(); 1253a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner for (unsigned i = 0, e = TI->getNumSuccessors(); i != e; ++i) { 1254a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner MachineBasicBlock *Succ0MBB = FuncInfo.MBBMap[TI->getSuccessor(i)]; 1255a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner BB->addSuccessor(Succ0MBB); 1256a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner } 12571c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 1258