VirtRegMap.cpp revision 172c362fefe3d6e762ada119d4084ed4ed31595b
134d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos//===-- llvm/CodeGen/VirtRegMap.cpp - Virtual Register Map ----------------===// 234d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos// 334d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos// The LLVM Compiler Infrastructure 434d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos// 534d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos// This file was developed by the LLVM research group and is distributed under 634d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos// the University of Illinois Open Source License. See LICENSE.TXT for details. 734d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos// 834d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos//===----------------------------------------------------------------------===// 934d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos// 108c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner// This file implements the VirtRegMap class. 118c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner// 128c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner// It also contains implementations of the the Spiller interface, which, given a 138c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner// virtual register map and a machine function, eliminates all virtual 148c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner// references by replacing them with physical register references - adding spill 150d6c5b6489b9abb634a1506d183ba47f1bf4d1f0Alkis Evlogimenos// code as necessary. 1634d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos// 1734d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos//===----------------------------------------------------------------------===// 1834d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos 198c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner#define DEBUG_TYPE "spiller" 2034d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos#include "VirtRegMap.h" 210d6c5b6489b9abb634a1506d183ba47f1bf4d1f0Alkis Evlogimenos#include "llvm/Function.h" 2234d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos#include "llvm/CodeGen/MachineFrameInfo.h" 238c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner#include "llvm/CodeGen/MachineFunction.h" 248c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner#include "llvm/CodeGen/SSARegMap.h" 2534d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos#include "llvm/Target/TargetMachine.h" 260d6c5b6489b9abb634a1506d183ba47f1bf4d1f0Alkis Evlogimenos#include "llvm/Target/TargetInstrInfo.h" 27551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#include "llvm/Support/CommandLine.h" 28551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#include "llvm/Support/Debug.h" 29551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#include "llvm/ADT/Statistic.h" 30551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#include "llvm/ADT/STLExtras.h" 3127f291600b04c382c390b16fdacd52b910b9164dChris Lattner#include <algorithm> 3234d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenosusing namespace llvm; 3334d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos 3434d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenosnamespace { 358c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner Statistic<> NumSpills("spiller", "Number of register spills"); 368c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner Statistic<> NumStores("spiller", "Number of stores added"); 378c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner Statistic<> NumLoads ("spiller", "Number of loads added"); 387fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner Statistic<> NumReused("spiller", "Number of values reused"); 3952b25db3ef9390271bbfa0b5c6efe0a72ce7cb8eChris Lattner Statistic<> NumDSE ("spiller", "Number of dead stores elided"); 408c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 418c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner enum SpillerName { simple, local }; 428c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 438c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner cl::opt<SpillerName> 448c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner SpillerOpt("spiller", 457fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner cl::desc("Spiller to use: (default: local)"), 468c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner cl::Prefix, 478c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner cl::values(clEnumVal(simple, " simple spiller"), 488c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner clEnumVal(local, " local spiller"), 498c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner clEnumValEnd), 507fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner cl::init(local)); 518c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner} 528c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 538c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner//===----------------------------------------------------------------------===// 548c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner// VirtRegMap implementation 558c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner//===----------------------------------------------------------------------===// 568c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 578c4d88d3697835371ecf6823f4142af13603ad2dChris Lattnervoid VirtRegMap::grow() { 587f690e625807b9320bf4ae437b8f35258acc99deChris Lattner Virt2PhysMap.grow(MF.getSSARegMap()->getLastVirtReg()); 597f690e625807b9320bf4ae437b8f35258acc99deChris Lattner Virt2StackSlotMap.grow(MF.getSSARegMap()->getLastVirtReg()); 6034d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos} 6134d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos 628c4d88d3697835371ecf6823f4142af13603ad2dChris Lattnerint VirtRegMap::assignVirt2StackSlot(unsigned virtReg) { 638c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner assert(MRegisterInfo::isVirtualRegister(virtReg)); 647f690e625807b9320bf4ae437b8f35258acc99deChris Lattner assert(Virt2StackSlotMap[virtReg] == NO_STACK_SLOT && 658c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner "attempt to assign stack slot to already spilled register"); 667f690e625807b9320bf4ae437b8f35258acc99deChris Lattner const TargetRegisterClass* RC = MF.getSSARegMap()->getRegClass(virtReg); 677f690e625807b9320bf4ae437b8f35258acc99deChris Lattner int frameIndex = MF.getFrameInfo()->CreateStackObject(RC->getSize(), 687f690e625807b9320bf4ae437b8f35258acc99deChris Lattner RC->getAlignment()); 697f690e625807b9320bf4ae437b8f35258acc99deChris Lattner Virt2StackSlotMap[virtReg] = frameIndex; 708c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner ++NumSpills; 718c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner return frameIndex; 7234d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos} 7334d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos 748c4d88d3697835371ecf6823f4142af13603ad2dChris Lattnervoid VirtRegMap::assignVirt2StackSlot(unsigned virtReg, int frameIndex) { 758c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner assert(MRegisterInfo::isVirtualRegister(virtReg)); 767f690e625807b9320bf4ae437b8f35258acc99deChris Lattner assert(Virt2StackSlotMap[virtReg] == NO_STACK_SLOT && 778c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner "attempt to assign stack slot to already spilled register"); 787f690e625807b9320bf4ae437b8f35258acc99deChris Lattner Virt2StackSlotMap[virtReg] = frameIndex; 7938af59a43c4176d8f34bd26faeb18b23080a1d9bAlkis Evlogimenos} 8038af59a43c4176d8f34bd26faeb18b23080a1d9bAlkis Evlogimenos 81bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattnervoid VirtRegMap::virtFolded(unsigned VirtReg, MachineInstr *OldMI, 82bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner unsigned OpNo, MachineInstr *NewMI) { 83bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner // Move previous memory references folded to new instruction. 84bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner MI2VirtMapTy::iterator IP = MI2VirtMap.lower_bound(NewMI); 85edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman for (MI2VirtMapTy::iterator I = MI2VirtMap.lower_bound(OldMI), 86bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner E = MI2VirtMap.end(); I != E && I->first == OldMI; ) { 87bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner MI2VirtMap.insert(IP, std::make_pair(NewMI, I->second)); 88dbea9731b12e62f70d9da40cf273cdd9105f987cChris Lattner MI2VirtMap.erase(I++); 898c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 90dbea9731b12e62f70d9da40cf273cdd9105f987cChris Lattner 91bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner ModRef MRInfo; 92bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner if (!OldMI->getOperand(OpNo).isDef()) { 93bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner assert(OldMI->getOperand(OpNo).isUse() && "Operand is not use or def?"); 94bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner MRInfo = isRef; 95bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner } else { 96bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner MRInfo = OldMI->getOperand(OpNo).isUse() ? isModRef : isMod; 97bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner } 988c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 998c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner // add new memory reference 100bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner MI2VirtMap.insert(IP, std::make_pair(NewMI, std::make_pair(VirtReg, MRInfo))); 1018c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner} 1025f37502bfbadfa65de087627bd67fd58bb03725cAlkis Evlogimenos 1037f690e625807b9320bf4ae437b8f35258acc99deChris Lattnervoid VirtRegMap::print(std::ostream &OS) const { 1047f690e625807b9320bf4ae437b8f35258acc99deChris Lattner const MRegisterInfo* MRI = MF.getTarget().getRegisterInfo(); 1058c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 1067f690e625807b9320bf4ae437b8f35258acc99deChris Lattner OS << "********** REGISTER MAP **********\n"; 1078c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner for (unsigned i = MRegisterInfo::FirstVirtualRegister, 1087f690e625807b9320bf4ae437b8f35258acc99deChris Lattner e = MF.getSSARegMap()->getLastVirtReg(); i <= e; ++i) { 1097f690e625807b9320bf4ae437b8f35258acc99deChris Lattner if (Virt2PhysMap[i] != (unsigned)VirtRegMap::NO_PHYS_REG) 1107f690e625807b9320bf4ae437b8f35258acc99deChris Lattner OS << "[reg" << i << " -> " << MRI->getName(Virt2PhysMap[i]) << "]\n"; 111edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 1128c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 1138c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 1148c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner for (unsigned i = MRegisterInfo::FirstVirtualRegister, 1157f690e625807b9320bf4ae437b8f35258acc99deChris Lattner e = MF.getSSARegMap()->getLastVirtReg(); i <= e; ++i) 1167f690e625807b9320bf4ae437b8f35258acc99deChris Lattner if (Virt2StackSlotMap[i] != VirtRegMap::NO_STACK_SLOT) 1177f690e625807b9320bf4ae437b8f35258acc99deChris Lattner OS << "[reg" << i << " -> fi#" << Virt2StackSlotMap[i] << "]\n"; 1187f690e625807b9320bf4ae437b8f35258acc99deChris Lattner OS << '\n'; 1195f37502bfbadfa65de087627bd67fd58bb03725cAlkis Evlogimenos} 1205f37502bfbadfa65de087627bd67fd58bb03725cAlkis Evlogimenos 1218c4d88d3697835371ecf6823f4142af13603ad2dChris Lattnervoid VirtRegMap::dump() const { print(std::cerr); } 12234d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos 1230d6c5b6489b9abb634a1506d183ba47f1bf4d1f0Alkis Evlogimenos 1248c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner//===----------------------------------------------------------------------===// 1258c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner// Simple Spiller Implementation 1268c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner//===----------------------------------------------------------------------===// 127dd420e060accd1d773c731e77335cff65ca34013Alkis Evlogimenos 1288c4d88d3697835371ecf6823f4142af13603ad2dChris LattnerSpiller::~Spiller() {} 129dd420e060accd1d773c731e77335cff65ca34013Alkis Evlogimenos 1300d6c5b6489b9abb634a1506d183ba47f1bf4d1f0Alkis Evlogimenosnamespace { 1318c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner struct SimpleSpiller : public Spiller { 1328c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner bool runOnMachineFunction(MachineFunction& mf, const VirtRegMap &VRM); 1338c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner }; 1348c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner} 1350d6c5b6489b9abb634a1506d183ba47f1bf4d1f0Alkis Evlogimenos 136b0f31bf19b9cd0107900728123d4848eae462e6cChris Lattnerbool SimpleSpiller::runOnMachineFunction(MachineFunction &MF, 137b0f31bf19b9cd0107900728123d4848eae462e6cChris Lattner const VirtRegMap &VRM) { 1388c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner DEBUG(std::cerr << "********** REWRITE MACHINE CODE **********\n"); 1398c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner DEBUG(std::cerr << "********** Function: " 1408c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner << MF.getFunction()->getName() << '\n'); 141b0f31bf19b9cd0107900728123d4848eae462e6cChris Lattner const TargetMachine &TM = MF.getTarget(); 142b0f31bf19b9cd0107900728123d4848eae462e6cChris Lattner const MRegisterInfo &MRI = *TM.getRegisterInfo(); 143b0f31bf19b9cd0107900728123d4848eae462e6cChris Lattner bool *PhysRegsUsed = MF.getUsedPhysregs(); 1448c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 1454ea1b828ebc5d2e8711acf13c2a3fdd7c14fe339Chris Lattner // LoadedRegs - Keep track of which vregs are loaded, so that we only load 1464ea1b828ebc5d2e8711acf13c2a3fdd7c14fe339Chris Lattner // each vreg once (in the case where a spilled vreg is used by multiple 1474ea1b828ebc5d2e8711acf13c2a3fdd7c14fe339Chris Lattner // operands). This is always smaller than the number of operands to the 1484ea1b828ebc5d2e8711acf13c2a3fdd7c14fe339Chris Lattner // current machine instr, so it should be small. 1494ea1b828ebc5d2e8711acf13c2a3fdd7c14fe339Chris Lattner std::vector<unsigned> LoadedRegs; 1508c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 1510fc27ccdd374799c8d65b61e89db53ba1ea47358Chris Lattner for (MachineFunction::iterator MBBI = MF.begin(), E = MF.end(); 1520fc27ccdd374799c8d65b61e89db53ba1ea47358Chris Lattner MBBI != E; ++MBBI) { 1530fc27ccdd374799c8d65b61e89db53ba1ea47358Chris Lattner DEBUG(std::cerr << MBBI->getBasicBlock()->getName() << ":\n"); 1540fc27ccdd374799c8d65b61e89db53ba1ea47358Chris Lattner MachineBasicBlock &MBB = *MBBI; 1550fc27ccdd374799c8d65b61e89db53ba1ea47358Chris Lattner for (MachineBasicBlock::iterator MII = MBB.begin(), 1560fc27ccdd374799c8d65b61e89db53ba1ea47358Chris Lattner E = MBB.end(); MII != E; ++MII) { 1570fc27ccdd374799c8d65b61e89db53ba1ea47358Chris Lattner MachineInstr &MI = *MII; 1580fc27ccdd374799c8d65b61e89db53ba1ea47358Chris Lattner for (unsigned i = 0, e = MI.getNumOperands(); i != e; ++i) { 1597fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner MachineOperand &MO = MI.getOperand(i); 160886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner if (MO.isRegister() && MO.getReg()) 161886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner if (MRegisterInfo::isVirtualRegister(MO.getReg())) { 162886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner unsigned VirtReg = MO.getReg(); 163886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner unsigned PhysReg = VRM.getPhys(VirtReg); 164886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner if (VRM.hasStackSlot(VirtReg)) { 165886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner int StackSlot = VRM.getStackSlot(VirtReg); 166bf9716b9c48d3b0370c715cd79540945f73dc296Chris Lattner const TargetRegisterClass* RC = 167bf9716b9c48d3b0370c715cd79540945f73dc296Chris Lattner MF.getSSARegMap()->getRegClass(VirtReg); 168edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 169886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner if (MO.isUse() && 170886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner std::find(LoadedRegs.begin(), LoadedRegs.end(), VirtReg) 171886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner == LoadedRegs.end()) { 172bf9716b9c48d3b0370c715cd79540945f73dc296Chris Lattner MRI.loadRegFromStackSlot(MBB, &MI, PhysReg, StackSlot, RC); 173886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner LoadedRegs.push_back(VirtReg); 174886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner ++NumLoads; 175886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner DEBUG(std::cerr << '\t' << *prior(MII)); 176886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner } 177edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 178886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner if (MO.isDef()) { 179bf9716b9c48d3b0370c715cd79540945f73dc296Chris Lattner MRI.storeRegToStackSlot(MBB, next(MII), PhysReg, StackSlot, RC); 180886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner ++NumStores; 181886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner } 1820fc27ccdd374799c8d65b61e89db53ba1ea47358Chris Lattner } 183886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner PhysRegsUsed[PhysReg] = true; 184886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner MI.SetMachineOperandReg(i, PhysReg); 185886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner } else { 186886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner PhysRegsUsed[MO.getReg()] = true; 1878c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 1888c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 189886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner 190477e4555de341c5de780de3720d6f115ec133c4eChris Lattner DEBUG(std::cerr << '\t' << MI); 1914ea1b828ebc5d2e8711acf13c2a3fdd7c14fe339Chris Lattner LoadedRegs.clear(); 1928c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 1938c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 1948c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner return true; 1958c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner} 1960d6c5b6489b9abb634a1506d183ba47f1bf4d1f0Alkis Evlogimenos 1978c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner//===----------------------------------------------------------------------===// 1988c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner// Local Spiller Implementation 1998c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner//===----------------------------------------------------------------------===// 2000d6c5b6489b9abb634a1506d183ba47f1bf4d1f0Alkis Evlogimenos 2018c4d88d3697835371ecf6823f4142af13603ad2dChris Lattnernamespace { 2027fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner /// LocalSpiller - This spiller does a simple pass over the machine basic 2037fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner /// block to attempt to keep spills in registers as much as possible for 2047fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner /// blocks that have low register pressure (the vreg may be spilled due to 2057fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner /// register pressure in other blocks). 2068c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner class LocalSpiller : public Spiller { 2078c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner const MRegisterInfo *MRI; 2087fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner const TargetInstrInfo *TII; 2098c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner public: 2107fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner bool runOnMachineFunction(MachineFunction &MF, const VirtRegMap &VRM) { 2117fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner MRI = MF.getTarget().getRegisterInfo(); 2127fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner TII = MF.getTarget().getInstrInfo(); 2137fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner DEBUG(std::cerr << "\n**** Local spiller rewriting function '" 2147fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner << MF.getFunction()->getName() << "':\n"); 2157fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 2167fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner for (MachineFunction::iterator MBB = MF.begin(), E = MF.end(); 2177fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner MBB != E; ++MBB) 2187fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner RewriteMBB(*MBB, VRM); 2197fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner return true; 2208c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 2217fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner private: 2227fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner void RewriteMBB(MachineBasicBlock &MBB, const VirtRegMap &VRM); 2237fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner void ClobberPhysReg(unsigned PR, std::map<int, unsigned> &SpillSlots, 2247fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner std::map<unsigned, int> &PhysRegs); 2257fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner void ClobberPhysRegOnly(unsigned PR, std::map<int, unsigned> &SpillSlots, 2267fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner std::map<unsigned, int> &PhysRegs); 2278c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner }; 2288c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner} 2298c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 2307fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattnervoid LocalSpiller::ClobberPhysRegOnly(unsigned PhysReg, 2317fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner std::map<int, unsigned> &SpillSlots, 2327fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner std::map<unsigned, int> &PhysRegs) { 2337fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner std::map<unsigned, int>::iterator I = PhysRegs.find(PhysReg); 2347fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner if (I != PhysRegs.end()) { 2357fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner int Slot = I->second; 2367fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner PhysRegs.erase(I); 2377fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner assert(SpillSlots[Slot] == PhysReg && "Bidirectional map mismatch!"); 2387fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner SpillSlots.erase(Slot); 2397fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner DEBUG(std::cerr << "PhysReg " << MRI->getName(PhysReg) 2407fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner << " clobbered, invalidating SS#" << Slot << "\n"); 2418c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 2428c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 2438c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner} 2440d6c5b6489b9abb634a1506d183ba47f1bf4d1f0Alkis Evlogimenos 2457fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattnervoid LocalSpiller::ClobberPhysReg(unsigned PhysReg, 2467fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner std::map<int, unsigned> &SpillSlots, 2477fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner std::map<unsigned, int> &PhysRegs) { 2487fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner for (const unsigned *AS = MRI->getAliasSet(PhysReg); *AS; ++AS) 2497fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner ClobberPhysRegOnly(*AS, SpillSlots, PhysRegs); 2507fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner ClobberPhysRegOnly(PhysReg, SpillSlots, PhysRegs); 2518c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner} 2528c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 2538c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 2547fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner// ReusedOp - For each reused operand, we keep track of a bit of information, in 2557fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner// case we need to rollback upon processing a new operand. See comments below. 2567fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattnernamespace { 2577fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner struct ReusedOp { 2587fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // The MachineInstr operand that reused an available value. 2597fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner unsigned Operand; 260edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 2617fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // StackSlot - The spill slot of the value being reused. 2627fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner unsigned StackSlot; 263edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 2647fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // PhysRegReused - The physical register the value was available in. 2657fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner unsigned PhysRegReused; 266edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 2677fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // AssignedPhysReg - The physreg that was assigned for use by the reload. 2687fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner unsigned AssignedPhysReg; 2698a61a7524af19d67bd11f8e7d868ca75efbf5c91Chris Lattner 2708a61a7524af19d67bd11f8e7d868ca75efbf5c91Chris Lattner // VirtReg - The virtual register itself. 2718a61a7524af19d67bd11f8e7d868ca75efbf5c91Chris Lattner unsigned VirtReg; 2728a61a7524af19d67bd11f8e7d868ca75efbf5c91Chris Lattner 2738a61a7524af19d67bd11f8e7d868ca75efbf5c91Chris Lattner ReusedOp(unsigned o, unsigned ss, unsigned prr, unsigned apr, 2748a61a7524af19d67bd11f8e7d868ca75efbf5c91Chris Lattner unsigned vreg) 2758a61a7524af19d67bd11f8e7d868ca75efbf5c91Chris Lattner : Operand(o), StackSlot(ss), PhysRegReused(prr), AssignedPhysReg(apr), 2768a61a7524af19d67bd11f8e7d868ca75efbf5c91Chris Lattner VirtReg(vreg) {} 2777fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner }; 2787fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner} 2797fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 2807fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 2817fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner/// rewriteMBB - Keep track of which spills are available even after the 2827fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner/// register allocator is done with them. If possible, avoid reloading vregs. 2837fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattnervoid LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, const VirtRegMap &VRM) { 2847fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 2857fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // SpillSlotsAvailable - This map keeps track of all of the spilled virtual 2867fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // register values that are still available, due to being loaded to stored to, 2877fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // but not invalidated yet. 2887fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner std::map<int, unsigned> SpillSlotsAvailable; 2897fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 2907fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // PhysRegsAvailable - This is the inverse of SpillSlotsAvailable, indicating 2917fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // which physregs are in use holding a stack slot value. 2927fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner std::map<unsigned, int> PhysRegsAvailable; 2937fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 2947fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner DEBUG(std::cerr << MBB.getBasicBlock()->getName() << ":\n"); 2957fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 2967fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner std::vector<ReusedOp> ReusedOperands; 2977fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 2987fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // DefAndUseVReg - When we see a def&use operand that is spilled, keep track 2997fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // of it. ".first" is the machine operand index (should always be 0 for now), 3007fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // and ".second" is the virtual register that is spilled. 3017fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner std::vector<std::pair<unsigned, unsigned> > DefAndUseVReg; 3027fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 30352b25db3ef9390271bbfa0b5c6efe0a72ce7cb8eChris Lattner // MaybeDeadStores - When we need to write a value back into a stack slot, 30452b25db3ef9390271bbfa0b5c6efe0a72ce7cb8eChris Lattner // keep track of the inserted store. If the stack slot value is never read 30552b25db3ef9390271bbfa0b5c6efe0a72ce7cb8eChris Lattner // (because the value was used from some available register, for example), and 30652b25db3ef9390271bbfa0b5c6efe0a72ce7cb8eChris Lattner // subsequently stored to, the original store is dead. This map keeps track 30752b25db3ef9390271bbfa0b5c6efe0a72ce7cb8eChris Lattner // of inserted stores that are not used. If we see a subsequent store to the 30852b25db3ef9390271bbfa0b5c6efe0a72ce7cb8eChris Lattner // same stack slot, the original store is deleted. 30952b25db3ef9390271bbfa0b5c6efe0a72ce7cb8eChris Lattner std::map<int, MachineInstr*> MaybeDeadStores; 31052b25db3ef9390271bbfa0b5c6efe0a72ce7cb8eChris Lattner 311b0f31bf19b9cd0107900728123d4848eae462e6cChris Lattner bool *PhysRegsUsed = MBB.getParent()->getUsedPhysregs(); 312b0f31bf19b9cd0107900728123d4848eae462e6cChris Lattner 3137fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner for (MachineBasicBlock::iterator MII = MBB.begin(), E = MBB.end(); 3147fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner MII != E; ) { 3157fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner MachineInstr &MI = *MII; 3167fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner MachineBasicBlock::iterator NextMII = MII; ++NextMII; 3177fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 3187fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner ReusedOperands.clear(); 3197fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner DefAndUseVReg.clear(); 3207fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 3217fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // Process all of the spilled uses and all non spilled reg references. 3227fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner for (unsigned i = 0, e = MI.getNumOperands(); i != e; ++i) { 3237fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner MachineOperand &MO = MI.getOperand(i); 32450ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner if (!MO.isRegister() || MO.getReg() == 0) 32550ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner continue; // Ignore non-register operands. 32650ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner 32750ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner if (MRegisterInfo::isPhysicalRegister(MO.getReg())) { 32850ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // Ignore physregs for spilling, but remember that it is used by this 32950ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // function. 330886dd9136f4c5b4523a0958e726955272eb9dfb2Chris Lattner PhysRegsUsed[MO.getReg()] = true; 33150ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner continue; 33250ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner } 33350ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner 33450ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner assert(MRegisterInfo::isVirtualRegister(MO.getReg()) && 33550ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner "Not a virtual or a physical register?"); 33650ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner 33750ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner unsigned VirtReg = MO.getReg(); 33850ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner if (!VRM.hasStackSlot(VirtReg)) { 33950ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // This virtual register was assigned a physreg! 34050ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner unsigned Phys = VRM.getPhys(VirtReg); 34150ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner PhysRegsUsed[Phys] = true; 34250ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner MI.SetMachineOperandReg(i, Phys); 34350ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner continue; 34450ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner } 34550ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner 34650ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // This virtual register is now known to be a spilled value. 34750ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner if (!MO.isUse()) 34850ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner continue; // Handle defs in the loop below (handle use&def here though) 34950ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner 35050ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // If this is both a def and a use, we need to emit a store to the 35150ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // stack slot after the instruction. Keep track of D&U operands 35250ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // because we are about to change it to a physreg here. 35350ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner if (MO.isDef()) { 35450ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // Remember that this was a def-and-use operand, and that the 35550ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // stack slot is live after this instruction executes. 35650ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner DefAndUseVReg.push_back(std::make_pair(i, VirtReg)); 35750ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner } 35850ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner 35950ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner int StackSlot = VRM.getStackSlot(VirtReg); 36050ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner unsigned PhysReg; 36150ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner 36250ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // Check to see if this stack slot is available. 36350ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner std::map<int, unsigned>::iterator SSI = 36450ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner SpillSlotsAvailable.find(StackSlot); 36550ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner if (SSI != SpillSlotsAvailable.end()) { 36650ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner DEBUG(std::cerr << "Reusing SS#" << StackSlot << " from physreg " 36750ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner << MRI->getName(SSI->second) << " for vreg" 36850ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner << VirtReg <<" instead of reloading into physreg " 36950ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner << MRI->getName(VRM.getPhys(VirtReg)) << "\n"); 37050ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // If this stack slot value is already available, reuse it! 37150ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner PhysReg = SSI->second; 37250ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner MI.SetMachineOperandReg(i, PhysReg); 37350ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner 37450ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // The only technical detail we have is that we don't know that 37550ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // PhysReg won't be clobbered by a reloaded stack slot that occurs 37650ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // later in the instruction. In particular, consider 'op V1, V2'. 37750ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // If V1 is available in physreg R0, we would choose to reuse it 37850ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // here, instead of reloading it into the register the allocator 37950ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // indicated (say R1). However, V2 might have to be reloaded 38050ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // later, and it might indicate that it needs to live in R0. When 38150ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // this occurs, we need to have information available that 38250ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // indicates it is safe to use R1 for the reload instead of R0. 38350ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // 38450ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // To further complicate matters, we might conflict with an alias, 38550ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // or R0 and R1 might not be compatible with each other. In this 38650ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // case, we actually insert a reload for V1 in R1, ensuring that 38750ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // we can get at R0 or its alias. 38850ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner ReusedOperands.push_back(ReusedOp(i, StackSlot, PhysReg, 3898a61a7524af19d67bd11f8e7d868ca75efbf5c91Chris Lattner VRM.getPhys(VirtReg), VirtReg)); 39050ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner ++NumReused; 39150ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner continue; 39250ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner } 39350ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner 39450ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // Otherwise, reload it and remember that we have it. 39550ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner PhysReg = VRM.getPhys(VirtReg); 396172c362fefe3d6e762ada119d4084ed4ed31595bChris Lattner assert(PhysReg && "Must map virtreg to physreg!"); 397bf9716b9c48d3b0370c715cd79540945f73dc296Chris Lattner const TargetRegisterClass* RC = 398bf9716b9c48d3b0370c715cd79540945f73dc296Chris Lattner MBB.getParent()->getSSARegMap()->getRegClass(VirtReg); 39950ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner 40050ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner RecheckRegister: 40150ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // Note that, if we reused a register for a previous operand, the 40250ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // register we want to reload into might not actually be 40350ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // available. If this occurs, use the register indicated by the 40450ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // reuser. 40550ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner if (!ReusedOperands.empty()) // This is most often empty. 40650ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner for (unsigned ro = 0, e = ReusedOperands.size(); ro != e; ++ro) 40750ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner if (ReusedOperands[ro].PhysRegReused == PhysReg) { 40850ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // Yup, use the reload register that we didn't use before. 40950ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner PhysReg = ReusedOperands[ro].AssignedPhysReg; 41050ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner goto RecheckRegister; 41150ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner } else { 41250ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner ReusedOp &Op = ReusedOperands[ro]; 41350ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner unsigned PRRU = Op.PhysRegReused; 41450ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner if (MRI->areAliases(PRRU, PhysReg)) { 41550ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // Okay, we found out that an alias of a reused register 41650ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // was used. This isn't good because it means we have 41750ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // to undo a previous reuse. 4188a61a7524af19d67bd11f8e7d868ca75efbf5c91Chris Lattner const TargetRegisterClass *AliasRC = 4198a61a7524af19d67bd11f8e7d868ca75efbf5c91Chris Lattner MBB.getParent()->getSSARegMap()->getRegClass(Op.VirtReg); 42050ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner MRI->loadRegFromStackSlot(MBB, &MI, Op.AssignedPhysReg, 4218a61a7524af19d67bd11f8e7d868ca75efbf5c91Chris Lattner Op.StackSlot, AliasRC); 42250ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner ClobberPhysReg(Op.AssignedPhysReg, SpillSlotsAvailable, 42350ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner PhysRegsAvailable); 4247fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 42552b25db3ef9390271bbfa0b5c6efe0a72ce7cb8eChris Lattner // Any stores to this stack slot are not dead anymore. 42650ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner MaybeDeadStores.erase(Op.StackSlot); 42750ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner 42850ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner MI.SetMachineOperandReg(Op.Operand, Op.AssignedPhysReg); 42950ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner PhysRegsAvailable[Op.AssignedPhysReg] = Op.StackSlot; 43050ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner SpillSlotsAvailable[Op.StackSlot] = Op.AssignedPhysReg; 43150ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner PhysRegsAvailable.erase(Op.PhysRegReused); 43250ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner DEBUG(std::cerr << "Remembering SS#" << Op.StackSlot 43350ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner << " in physreg " 43450ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner << MRI->getName(Op.AssignedPhysReg) << "\n"); 4357fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner ++NumLoads; 4367fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner DEBUG(std::cerr << '\t' << *prior(MII)); 4377fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 43850ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner DEBUG(std::cerr << "Reuse undone!\n"); 43950ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner ReusedOperands.erase(ReusedOperands.begin()+ro); 44050ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner --NumReused; 44150ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner goto ContinueReload; 4427fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner } 4437fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner } 44450ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner ContinueReload: 44550ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner PhysRegsUsed[PhysReg] = true; 446bf9716b9c48d3b0370c715cd79540945f73dc296Chris Lattner MRI->loadRegFromStackSlot(MBB, &MI, PhysReg, StackSlot, RC); 44750ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // This invalidates PhysReg. 44850ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner ClobberPhysReg(PhysReg, SpillSlotsAvailable, PhysRegsAvailable); 44950ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner 45050ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner // Any stores to this stack slot are not dead anymore. 45150ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner MaybeDeadStores.erase(StackSlot); 45250ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner 45350ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner MI.SetMachineOperandReg(i, PhysReg); 45450ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner PhysRegsAvailable[PhysReg] = StackSlot; 45550ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner SpillSlotsAvailable[StackSlot] = PhysReg; 45650ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner DEBUG(std::cerr << "Remembering SS#" << StackSlot <<" in physreg " 45750ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner << MRI->getName(PhysReg) << "\n"); 45850ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner ++NumLoads; 45950ea01ed5ba23c8988af9fed0b91178e69140a80Chris Lattner DEBUG(std::cerr << '\t' << *prior(MII)); 4608c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 4610d6c5b6489b9abb634a1506d183ba47f1bf4d1f0Alkis Evlogimenos 4627fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // Loop over all of the implicit defs, clearing them from our available 4637fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // sets. 464b0f31bf19b9cd0107900728123d4848eae462e6cChris Lattner for (const unsigned *ImpDef = TII->getImplicitDefs(MI.getOpcode()); 465b0f31bf19b9cd0107900728123d4848eae462e6cChris Lattner *ImpDef; ++ImpDef) { 466b0f31bf19b9cd0107900728123d4848eae462e6cChris Lattner PhysRegsUsed[*ImpDef] = true; 4677fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner ClobberPhysReg(*ImpDef, SpillSlotsAvailable, PhysRegsAvailable); 468b0f31bf19b9cd0107900728123d4848eae462e6cChris Lattner } 4697fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 4707fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner DEBUG(std::cerr << '\t' << MI); 4717fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 4727fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // If we have folded references to memory operands, make sure we clear all 4737fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // physical registers that may contain the value of the spilled virtual 4747fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // register 4758f1d6402ba73b96993ffd1eb9434b28c828d8856Chris Lattner VirtRegMap::MI2VirtMapTy::const_iterator I, End; 4768f1d6402ba73b96993ffd1eb9434b28c828d8856Chris Lattner for (tie(I, End) = VRM.getFoldedVirts(&MI); I != End; ++I) { 477bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner DEBUG(std::cerr << "Folded vreg: " << I->second.first << " MR: " 478bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner << I->second.second); 479bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner unsigned VirtReg = I->second.first; 480bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner VirtRegMap::ModRef MR = I->second.second; 481cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner if (!VRM.hasStackSlot(VirtReg)) { 482cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner DEBUG(std::cerr << ": No stack slot!\n"); 483cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner continue; 484cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner } 485cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner int SS = VRM.getStackSlot(VirtReg); 486cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner DEBUG(std::cerr << " - StackSlot: " << SS << "\n"); 487cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner 488cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner // If this folded instruction is just a use, check to see if it's a 489cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner // straight load from the virt reg slot. 490cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner if ((MR & VirtRegMap::isRef) && !(MR & VirtRegMap::isMod)) { 491cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner int FrameIdx; 492cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner if (unsigned DestReg = MRI->isLoadFromStackSlot(&MI, FrameIdx)) { 493cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner // If this spill slot is available, insert a copy for it! 494cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner std::map<int, unsigned>::iterator It = SpillSlotsAvailable.find(SS); 495cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner if (FrameIdx == SS && It != SpillSlotsAvailable.end()) { 496cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner DEBUG(std::cerr << "Promoted Load To Copy: " << MI); 497cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner MachineFunction &MF = *MBB.getParent(); 498cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner if (DestReg != It->second) { 499cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner MRI->copyRegToReg(MBB, &MI, DestReg, It->second, 500cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner MF.getSSARegMap()->getRegClass(VirtReg)); 50122480c43504eca3092f79d9b42bdbb1b413e8e53Chris Lattner // Revisit the copy so we make sure to notice the effects of the 50222480c43504eca3092f79d9b42bdbb1b413e8e53Chris Lattner // operation on the destreg (either needing to RA it if it's 50322480c43504eca3092f79d9b42bdbb1b413e8e53Chris Lattner // virtual or needing to clobber any values if it's physical). 50422480c43504eca3092f79d9b42bdbb1b413e8e53Chris Lattner NextMII = &MI; 50522480c43504eca3092f79d9b42bdbb1b413e8e53Chris Lattner --NextMII; // backtrack to the copy. 506cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner } 507cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner MBB.erase(&MI); 508cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner goto ProcessNextInst; 509bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner } 510bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner } 511cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner } 51252b25db3ef9390271bbfa0b5c6efe0a72ce7cb8eChris Lattner 513cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner // If this reference is not a use, any previous store is now dead. 514cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner // Otherwise, the store to this stack slot is not dead anymore. 515cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner std::map<int, MachineInstr*>::iterator MDSI = MaybeDeadStores.find(SS); 516cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner if (MDSI != MaybeDeadStores.end()) { 517cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner if (MR & VirtRegMap::isRef) // Previous store is not dead. 518cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner MaybeDeadStores.erase(MDSI); 519cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner else { 520cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner // If we get here, the store is dead, nuke it now. 521cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner assert(MR == VirtRegMap::isMod && "Can't be modref!"); 522cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner MBB.erase(MDSI->second); 523cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner MaybeDeadStores.erase(MDSI); 524cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner ++NumDSE; 525cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner } 526cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner } 527cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner 528cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner // If the spill slot value is available, and this is a new definition of 529cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner // the value, the value is not available anymore. 530cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner if (MR & VirtRegMap::isMod) { 531cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner std::map<int, unsigned>::iterator It = SpillSlotsAvailable.find(SS); 532cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner if (It != SpillSlotsAvailable.end()) { 533cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner PhysRegsAvailable.erase(It->second); 534cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner SpillSlotsAvailable.erase(It); 5357fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner } 5367fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner } 5378c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 5380d6c5b6489b9abb634a1506d183ba47f1bf4d1f0Alkis Evlogimenos 5397fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // Process all of the spilled defs. 5407fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner for (unsigned i = 0, e = MI.getNumOperands(); i != e; ++i) { 5417fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner MachineOperand &MO = MI.getOperand(i); 5427fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner if (MO.isRegister() && MO.getReg() && MO.isDef()) { 5437fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner unsigned VirtReg = MO.getReg(); 5447fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 5457fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner bool TakenCareOf = false; 5467fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner if (!MRegisterInfo::isVirtualRegister(VirtReg)) { 5477fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // Check to see if this is a def-and-use vreg operand that we do need 5487fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // to insert a store for. 5497fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner bool OpTakenCareOf = false; 5507fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner if (MO.isUse() && !DefAndUseVReg.empty()) { 5517fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner for (unsigned dau = 0, e = DefAndUseVReg.size(); dau != e; ++dau) 5527fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner if (DefAndUseVReg[dau].first == i) { 5537fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner VirtReg = DefAndUseVReg[dau].second; 5547fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner OpTakenCareOf = true; 5557fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner break; 5567fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner } 5577fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner } 558edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 5597fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner if (!OpTakenCareOf) { 5607fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner ClobberPhysReg(VirtReg, SpillSlotsAvailable, PhysRegsAvailable); 5617fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner TakenCareOf = true; 5627fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner } 563edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman } 5647fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 5657fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner if (!TakenCareOf) { 5667fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // The only vregs left are stack slot definitions. 5677fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner int StackSlot = VRM.getStackSlot(VirtReg); 568bf9716b9c48d3b0370c715cd79540945f73dc296Chris Lattner const TargetRegisterClass *RC = 569bf9716b9c48d3b0370c715cd79540945f73dc296Chris Lattner MBB.getParent()->getSSARegMap()->getRegClass(VirtReg); 5707fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner unsigned PhysReg; 5717fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 5727fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // If this is a def&use operand, and we used a different physreg for 5737fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // it than the one assigned, make sure to execute the store from the 5747fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // correct physical register. 5757fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner if (MO.getReg() == VirtReg) 5767fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner PhysReg = VRM.getPhys(VirtReg); 5777fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner else 5787fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner PhysReg = MO.getReg(); 5797fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 580b0f31bf19b9cd0107900728123d4848eae462e6cChris Lattner PhysRegsUsed[PhysReg] = true; 581bf9716b9c48d3b0370c715cd79540945f73dc296Chris Lattner MRI->storeRegToStackSlot(MBB, next(MII), PhysReg, StackSlot, RC); 5827fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner DEBUG(std::cerr << "Store:\t" << *next(MII)); 5837fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner MI.SetMachineOperandReg(i, PhysReg); 5847fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 58552b25db3ef9390271bbfa0b5c6efe0a72ce7cb8eChris Lattner // If there is a dead store to this stack slot, nuke it now. 58652b25db3ef9390271bbfa0b5c6efe0a72ce7cb8eChris Lattner MachineInstr *&LastStore = MaybeDeadStores[StackSlot]; 58752b25db3ef9390271bbfa0b5c6efe0a72ce7cb8eChris Lattner if (LastStore) { 5888df6a594d2781777cd25fe2d00818419a8b10e5cChris Lattner DEBUG(std::cerr << " Killed store:\t" << *LastStore); 58952b25db3ef9390271bbfa0b5c6efe0a72ce7cb8eChris Lattner ++NumDSE; 59052b25db3ef9390271bbfa0b5c6efe0a72ce7cb8eChris Lattner MBB.erase(LastStore); 59152b25db3ef9390271bbfa0b5c6efe0a72ce7cb8eChris Lattner } 59252b25db3ef9390271bbfa0b5c6efe0a72ce7cb8eChris Lattner LastStore = next(MII); 59352b25db3ef9390271bbfa0b5c6efe0a72ce7cb8eChris Lattner 5947fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // If the stack slot value was previously available in some other 5957fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // register, change it now. Otherwise, make the register available, 5967fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // in PhysReg. 5977fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner std::map<int, unsigned>::iterator SSA = 5987fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner SpillSlotsAvailable.find(StackSlot); 5997fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner if (SSA != SpillSlotsAvailable.end()) { 6007fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner // Remove the record for physreg. 6017fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner PhysRegsAvailable.erase(SSA->second); 6027fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner SpillSlotsAvailable.erase(SSA); 6037fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner } 6047fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner ClobberPhysReg(PhysReg, SpillSlotsAvailable, PhysRegsAvailable); 6057fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 6067fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner PhysRegsAvailable[PhysReg] = StackSlot; 6077fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner SpillSlotsAvailable[StackSlot] = PhysReg; 6087fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner DEBUG(std::cerr << "Updating SS#" << StackSlot <<" in physreg " 6098df6a594d2781777cd25fe2d00818419a8b10e5cChris Lattner << MRI->getName(PhysReg) << " for virtreg #" 6108df6a594d2781777cd25fe2d00818419a8b10e5cChris Lattner << VirtReg << "\n"); 6117fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 6127fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner ++NumStores; 6137fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner VirtReg = PhysReg; 6140d6c5b6489b9abb634a1506d183ba47f1bf4d1f0Alkis Evlogimenos } 6157fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner } 6168c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 617cea8688ee4637e0f3cffc75e47f15be756f043bfChris Lattner ProcessNextInst: 6187fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner MII = NextMII; 6198c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 6200d6c5b6489b9abb634a1506d183ba47f1bf4d1f0Alkis Evlogimenos} 6210d6c5b6489b9abb634a1506d183ba47f1bf4d1f0Alkis Evlogimenos 6228c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 6237fb64347d7d1310b5f3f06f7ae97031c73a21797Chris Lattner 6248c4d88d3697835371ecf6823f4142af13603ad2dChris Lattnerllvm::Spiller* llvm::createSpiller() { 6258c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner switch (SpillerOpt) { 6268c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner default: assert(0 && "Unreachable!"); 6278c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner case local: 6288c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner return new LocalSpiller(); 6298c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner case simple: 6308c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner return new SimpleSpiller(); 6318c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 6320d6c5b6489b9abb634a1506d183ba47f1bf4d1f0Alkis Evlogimenos} 633