LiveIntervalAnalysis.cpp revision fbc8dd306aa7699a866db278db08d842762b2dc2
1a3b8b5c0e0a1d0942288568b2012592184ca67c5Chris Lattner//===-- LiveIntervalAnalysis.cpp - Live Interval Analysis -----------------===// 2ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos// 3ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos// The LLVM Compiler Infrastructure 4ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos// 54ee451de366474b9c228b4e5fa573795a715216dChris Lattner// This file is distributed under the University of Illinois Open Source 64ee451de366474b9c228b4e5fa573795a715216dChris Lattner// License. See LICENSE.TXT for details. 7ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos// 8ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos//===----------------------------------------------------------------------===// 9ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos// 10ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos// This file implements the LiveInterval analysis pass which is used 11ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos// by the Linear Scan Register allocator. This pass linearizes the 12ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos// basic blocks of the function in DFS order and uses the 13ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos// LiveVariables pass to conservatively compute live intervals for 14ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos// each virtual and physical register. 15ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos// 16ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos//===----------------------------------------------------------------------===// 17ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 184281e20aab7f1fe1b35b31c9237ad89c20937e02Jakob Stoklund Olesen#define DEBUG_TYPE "regalloc" 193c3fe462f7978b429ecdd71750c26be25c3d1335Chris Lattner#include "llvm/CodeGen/LiveIntervalAnalysis.h" 20015959ee38e4fd4a920f6b0065c50e524762f580Chris Lattner#include "llvm/Value.h" 216d69ba8a6901c69d78488cbc41f8dbf080618fdeDan Gohman#include "llvm/Analysis/AliasAnalysis.h" 22ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos#include "llvm/CodeGen/LiveVariables.h" 23ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos#include "llvm/CodeGen/MachineInstr.h" 2484bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner#include "llvm/CodeGen/MachineRegisterInfo.h" 25ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos#include "llvm/CodeGen/Passes.h" 266f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman#include "llvm/Target/TargetRegisterInfo.h" 27ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos#include "llvm/Target/TargetInstrInfo.h" 28ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos#include "llvm/Target/TargetMachine.h" 29551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#include "llvm/Support/CommandLine.h" 30551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#include "llvm/Support/Debug.h" 317d696d80409aad20bb5da0fc4eccab941dd371d4Torok Edwin#include "llvm/Support/ErrorHandling.h" 327d696d80409aad20bb5da0fc4eccab941dd371d4Torok Edwin#include "llvm/Support/raw_ostream.h" 33d35576b3c026cb323c4c240f0b20cf56089a1e5bAndrew Trick#include "llvm/ADT/DenseSet.h" 34551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#include "llvm/ADT/Statistic.h" 35551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#include "llvm/ADT/STLExtras.h" 3620aa474f8fbebde588edc101b90e834df28ce4ceAlkis Evlogimenos#include <algorithm> 37f41538d1b54f55e8900394929b50f7ce3e61125fLang Hames#include <limits> 3897af751deb9b26fd42fbcee082da9ccc4ded5b45Jeff Cohen#include <cmath> 39ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenosusing namespace llvm; 40ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 41844731a7f1909f55935e3514c9e713a62d67662eDan Gohman// Hidden options for help debugging. 421b2932024f098a6968645ac78d5848951d877c19Jakob Stoklund Olesenstatic cl::opt<bool> DisableReMat("disable-rematerialization", 43844731a7f1909f55935e3514c9e713a62d67662eDan Gohman cl::init(false), cl::Hidden); 44844731a7f1909f55935e3514c9e713a62d67662eDan Gohman 45752195e3c662c6b5db042cf897c984624720f3b8Evan ChengSTATISTIC(numIntervals , "Number of original intervals"); 46cd3245ac45c595da96bb768a55cddc356dff55feChris Lattner 471997473cf72957d0e70322e2fe6fe2ab141c58a6Devang Patelchar LiveIntervals::ID = 0; 482ab36d350293c77fc8941ce1023e4899df7e3a82Owen AndersonINITIALIZE_PASS_BEGIN(LiveIntervals, "liveintervals", 492ab36d350293c77fc8941ce1023e4899df7e3a82Owen Anderson "Live Interval Analysis", false, false) 508dd26253f54247e77e5accfdd70e7b4bf27b39c2Andrew TrickINITIALIZE_AG_DEPENDENCY(AliasAnalysis) 512ab36d350293c77fc8941ce1023e4899df7e3a82Owen AndersonINITIALIZE_PASS_DEPENDENCY(LiveVariables) 528dd26253f54247e77e5accfdd70e7b4bf27b39c2Andrew TrickINITIALIZE_PASS_DEPENDENCY(MachineDominatorTree) 532ab36d350293c77fc8941ce1023e4899df7e3a82Owen AndersonINITIALIZE_PASS_DEPENDENCY(SlotIndexes) 542ab36d350293c77fc8941ce1023e4899df7e3a82Owen AndersonINITIALIZE_PASS_END(LiveIntervals, "liveintervals", 55ce665bd2e2b581ab0858d1afe359192bac96b868Owen Anderson "Live Interval Analysis", false, false) 56ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 57f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattnervoid LiveIntervals::getAnalysisUsage(AnalysisUsage &AU) const { 58845012e6d31799c7fbd1193fa1af8ee2d12e9231Dan Gohman AU.setPreservesCFG(); 596d69ba8a6901c69d78488cbc41f8dbf080618fdeDan Gohman AU.addRequired<AliasAnalysis>(); 606d69ba8a6901c69d78488cbc41f8dbf080618fdeDan Gohman AU.addPreserved<AliasAnalysis>(); 611a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos AU.addRequired<LiveVariables>(); 62148341cc9b60d7d88be9c07a2b32b436e0cd301dEvan Cheng AU.addPreserved<LiveVariables>(); 63d35576b3c026cb323c4c240f0b20cf56089a1e5bAndrew Trick AU.addPreservedID(MachineLoopInfoID); 6467d65bb69d5cad957cbb6d672dc0b4a19c211a42Bill Wendling AU.addPreservedID(MachineDominatorsID); 65233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames AU.addPreserved<SlotIndexes>(); 66233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames AU.addRequiredTransitive<SlotIndexes>(); 671a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos MachineFunctionPass::getAnalysisUsage(AU); 68ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos} 69ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 70f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattnervoid LiveIntervals::releaseMemory() { 7103857b29d8271a23943254579e6cf7b7df4b1bd3Owen Anderson // Free the live intervals themselves. 7220e2839cb975a2d4ee931e1ea4c4660a36ef0177Owen Anderson for (DenseMap<unsigned, LiveInterval*>::iterator I = r2iMap_.begin(), 73d6a6b3b7563a3f54ba48d465fc03ee10bbccb7a8Bob Wilson E = r2iMap_.end(); I != E; ++I) 7403857b29d8271a23943254579e6cf7b7df4b1bd3Owen Anderson delete I->second; 751b2932024f098a6968645ac78d5848951d877c19Jakob Stoklund Olesen 761a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos r2iMap_.clear(); 773fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen RegMaskSlots.clear(); 783fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen RegMaskBits.clear(); 7934e85d0307e3c17e5061622dccf8a20e5457b099Jakob Stoklund Olesen RegMaskBlocks.clear(); 80ffd1326ff8dfc652a8026c3faebf55bbba7c32c7Lang Hames 81ce9a20b808ba48adf72e0c0615f903a65e9f9eb8Benjamin Kramer // Release VNInfo memory regions, VNInfo objects don't need to be dtor'd. 82ce9a20b808ba48adf72e0c0615f903a65e9f9eb8Benjamin Kramer VNInfoAllocator.Reset(); 83993141402f57b4d4cbb7f8a3113f19c61688f9b7Evan Cheng} 84993141402f57b4d4cbb7f8a3113f19c61688f9b7Evan Cheng 8580b3ce65e294a28b88c882d44a5e749a2924c9e3Owen Anderson/// runOnMachineFunction - Register allocate the whole function 8680b3ce65e294a28b88c882d44a5e749a2924c9e3Owen Anderson/// 8780b3ce65e294a28b88c882d44a5e749a2924c9e3Owen Andersonbool LiveIntervals::runOnMachineFunction(MachineFunction &fn) { 8880b3ce65e294a28b88c882d44a5e749a2924c9e3Owen Anderson mf_ = &fn; 8980b3ce65e294a28b88c882d44a5e749a2924c9e3Owen Anderson mri_ = &mf_->getRegInfo(); 9080b3ce65e294a28b88c882d44a5e749a2924c9e3Owen Anderson tm_ = &fn.getTarget(); 9180b3ce65e294a28b88c882d44a5e749a2924c9e3Owen Anderson tri_ = tm_->getRegisterInfo(); 9280b3ce65e294a28b88c882d44a5e749a2924c9e3Owen Anderson tii_ = tm_->getInstrInfo(); 936d69ba8a6901c69d78488cbc41f8dbf080618fdeDan Gohman aa_ = &getAnalysis<AliasAnalysis>(); 9480b3ce65e294a28b88c882d44a5e749a2924c9e3Owen Anderson lv_ = &getAnalysis<LiveVariables>(); 95233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames indexes_ = &getAnalysis<SlotIndexes>(); 9680b3ce65e294a28b88c882d44a5e749a2924c9e3Owen Anderson allocatableRegs_ = tri_->getAllocatableSet(fn); 97342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames reservedRegs_ = tri_->getReservedRegs(fn); 98ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 991a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos computeIntervals(); 100ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 1011a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos numIntervals += getNumIntervals(); 102843b160a2040b3ec4d3452678450afa11704c473Alkis Evlogimenos 10370ca358b7d540b6061236ddf757085042873c12cChris Lattner DEBUG(dump()); 1041a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos return true; 105ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos} 106ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 10770ca358b7d540b6061236ddf757085042873c12cChris Lattner/// print - Implement the dump method. 10845cfe545ec8177262dabc70580ce05feaa1c3880Chris Lattnervoid LiveIntervals::print(raw_ostream &OS, const Module* ) const { 109705e07f578e2b3af47ddab610feb4e7f2d3063a5Chris Lattner OS << "********** INTERVALS **********\n"; 110f658af5484855b37c6c651e9e5e671982d39af26Jakob Stoklund Olesen 111f658af5484855b37c6c651e9e5e671982d39af26Jakob Stoklund Olesen // Dump the physregs. 112f658af5484855b37c6c651e9e5e671982d39af26Jakob Stoklund Olesen for (unsigned Reg = 1, RegE = tri_->getNumRegs(); Reg != RegE; ++Reg) 113f658af5484855b37c6c651e9e5e671982d39af26Jakob Stoklund Olesen if (const LiveInterval *LI = r2iMap_.lookup(Reg)) { 114f658af5484855b37c6c651e9e5e671982d39af26Jakob Stoklund Olesen LI->print(OS, tri_); 115f658af5484855b37c6c651e9e5e671982d39af26Jakob Stoklund Olesen OS << '\n'; 116f658af5484855b37c6c651e9e5e671982d39af26Jakob Stoklund Olesen } 117f658af5484855b37c6c651e9e5e671982d39af26Jakob Stoklund Olesen 118f658af5484855b37c6c651e9e5e671982d39af26Jakob Stoklund Olesen // Dump the virtregs. 119f658af5484855b37c6c651e9e5e671982d39af26Jakob Stoklund Olesen for (unsigned Reg = 0, RegE = mri_->getNumVirtRegs(); Reg != RegE; ++Reg) 120f658af5484855b37c6c651e9e5e671982d39af26Jakob Stoklund Olesen if (const LiveInterval *LI = 121f658af5484855b37c6c651e9e5e671982d39af26Jakob Stoklund Olesen r2iMap_.lookup(TargetRegisterInfo::index2VirtReg(Reg))) { 122f658af5484855b37c6c651e9e5e671982d39af26Jakob Stoklund Olesen LI->print(OS, tri_); 123f658af5484855b37c6c651e9e5e671982d39af26Jakob Stoklund Olesen OS << '\n'; 124f658af5484855b37c6c651e9e5e671982d39af26Jakob Stoklund Olesen } 12570ca358b7d540b6061236ddf757085042873c12cChris Lattner 126752195e3c662c6b5db042cf897c984624720f3b8Evan Cheng printInstrs(OS); 127752195e3c662c6b5db042cf897c984624720f3b8Evan Cheng} 128752195e3c662c6b5db042cf897c984624720f3b8Evan Cheng 129752195e3c662c6b5db042cf897c984624720f3b8Evan Chengvoid LiveIntervals::printInstrs(raw_ostream &OS) const { 130705e07f578e2b3af47ddab610feb4e7f2d3063a5Chris Lattner OS << "********** MACHINEINSTRS **********\n"; 131f4a1e1a69f0727762a73ef0d551e3bbd16b7c04eJakob Stoklund Olesen mf_->print(OS, indexes_); 13270ca358b7d540b6061236ddf757085042873c12cChris Lattner} 13370ca358b7d540b6061236ddf757085042873c12cChris Lattner 134752195e3c662c6b5db042cf897c984624720f3b8Evan Chengvoid LiveIntervals::dumpInstrs() const { 1358a34229dcf484739119857988772572ef0cad9f2David Greene printInstrs(dbgs()); 136752195e3c662c6b5db042cf897c984624720f3b8Evan Cheng} 137752195e3c662c6b5db042cf897c984624720f3b8Evan Cheng 138afff40a62da19be15295c0f8ed5d4d450ccb45a5Evan Chengstatic 1393749943648772743c9c0e852553e50e6700a0c1bEvan Chengbool MultipleDefsBySameMI(const MachineInstr &MI, unsigned MOIdx) { 140afff40a62da19be15295c0f8ed5d4d450ccb45a5Evan Cheng unsigned Reg = MI.getOperand(MOIdx).getReg(); 141afff40a62da19be15295c0f8ed5d4d450ccb45a5Evan Cheng for (unsigned i = MOIdx+1, e = MI.getNumOperands(); i < e; ++i) { 142afff40a62da19be15295c0f8ed5d4d450ccb45a5Evan Cheng const MachineOperand &MO = MI.getOperand(i); 143afff40a62da19be15295c0f8ed5d4d450ccb45a5Evan Cheng if (!MO.isReg()) 144afff40a62da19be15295c0f8ed5d4d450ccb45a5Evan Cheng continue; 145afff40a62da19be15295c0f8ed5d4d450ccb45a5Evan Cheng if (MO.getReg() == Reg && MO.isDef()) { 146afff40a62da19be15295c0f8ed5d4d450ccb45a5Evan Cheng assert(MI.getOperand(MOIdx).getSubReg() != MO.getSubReg() && 147afff40a62da19be15295c0f8ed5d4d450ccb45a5Evan Cheng MI.getOperand(MOIdx).getSubReg() && 148ed2185e171a86b8c0e166803fd4066383a6cff08Jakob Stoklund Olesen (MO.getSubReg() || MO.isImplicit())); 149afff40a62da19be15295c0f8ed5d4d450ccb45a5Evan Cheng return true; 150afff40a62da19be15295c0f8ed5d4d450ccb45a5Evan Cheng } 151afff40a62da19be15295c0f8ed5d4d450ccb45a5Evan Cheng } 152afff40a62da19be15295c0f8ed5d4d450ccb45a5Evan Cheng return false; 153afff40a62da19be15295c0f8ed5d4d450ccb45a5Evan Cheng} 154afff40a62da19be15295c0f8ed5d4d450ccb45a5Evan Cheng 1553749943648772743c9c0e852553e50e6700a0c1bEvan Cheng/// isPartialRedef - Return true if the specified def at the specific index is 1563749943648772743c9c0e852553e50e6700a0c1bEvan Cheng/// partially re-defining the specified live interval. A common case of this is 1571b2932024f098a6968645ac78d5848951d877c19Jakob Stoklund Olesen/// a definition of the sub-register. 1583749943648772743c9c0e852553e50e6700a0c1bEvan Chengbool LiveIntervals::isPartialRedef(SlotIndex MIIdx, MachineOperand &MO, 1593749943648772743c9c0e852553e50e6700a0c1bEvan Cheng LiveInterval &interval) { 1603749943648772743c9c0e852553e50e6700a0c1bEvan Cheng if (!MO.getSubReg() || MO.isEarlyClobber()) 1613749943648772743c9c0e852553e50e6700a0c1bEvan Cheng return false; 1623749943648772743c9c0e852553e50e6700a0c1bEvan Cheng 1632debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen SlotIndex RedefIndex = MIIdx.getRegSlot(); 1643749943648772743c9c0e852553e50e6700a0c1bEvan Cheng const LiveRange *OldLR = 1652debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen interval.getLiveRangeContaining(RedefIndex.getRegSlot(true)); 1666e2968c85c1e162ee5bc813769eab223e3df0f15Lang Hames MachineInstr *DefMI = getInstructionFromIndex(OldLR->valno->def); 1676e2968c85c1e162ee5bc813769eab223e3df0f15Lang Hames if (DefMI != 0) { 1683749943648772743c9c0e852553e50e6700a0c1bEvan Cheng return DefMI->findRegisterDefOperandIdx(interval.reg) != -1; 1693749943648772743c9c0e852553e50e6700a0c1bEvan Cheng } 1703749943648772743c9c0e852553e50e6700a0c1bEvan Cheng return false; 1713749943648772743c9c0e852553e50e6700a0c1bEvan Cheng} 1723749943648772743c9c0e852553e50e6700a0c1bEvan Cheng 173be4f88a8b8bb3311e0dc4cde8533763d7923c3eaChris Lattnervoid LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb, 174ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos MachineBasicBlock::iterator mi, 175233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames SlotIndex MIIdx, 1768651125d2885f74546b6e2a556082111d5b75da3Lang Hames MachineOperand& MO, 177ef0732d25a9882c947984ae3f2afbef5463ba00fEvan Cheng unsigned MOIdx, 178be4f88a8b8bb3311e0dc4cde8533763d7923c3eaChris Lattner LiveInterval &interval) { 1794314268128be6d54c9a7f0709680e5a5b40f3ab3Jakob Stoklund Olesen DEBUG(dbgs() << "\t\tregister: " << PrintReg(interval.reg, tri_)); 180419852ca8a01aecde4c0e20af6b7bd6450e70f87Evan Cheng 181706515727c6d024015fffded2b3109a4f0ac5299Alkis Evlogimenos // Virtual registers may be defined multiple times (due to phi 182706515727c6d024015fffded2b3109a4f0ac5299Alkis Evlogimenos // elimination and 2-addr elimination). Much of what we do only has to be 183706515727c6d024015fffded2b3109a4f0ac5299Alkis Evlogimenos // done once for the vreg. We use an empty interval to detect the first 1841a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // time we see a vreg. 185d129d73b725e32d2fc0c87f392c239db8801e922Evan Cheng LiveVariables::VarInfo& vi = lv_->getVarInfo(interval.reg); 1861a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos if (interval.empty()) { 1871a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // Get the Idx of the defining instructions. 188d14614e6777771f8fec3062bcaf2986c189ac84dJakob Stoklund Olesen SlotIndex defIndex = MIIdx.getRegSlot(MO.isEarlyClobber()); 18963e6a488cb6c29983415221719d05fbf99e00193Jakob Stoklund Olesen 19063e6a488cb6c29983415221719d05fbf99e00193Jakob Stoklund Olesen // Make sure the first definition is not a partial redefinition. Add an 19163e6a488cb6c29983415221719d05fbf99e00193Jakob Stoklund Olesen // <imp-def> of the full register. 192b0e1bc7b99809e2b45726affd73f72c60c506ea0Jakob Stoklund Olesen // FIXME: LiveIntervals shouldn't modify the code like this. Whoever 193b0e1bc7b99809e2b45726affd73f72c60c506ea0Jakob Stoklund Olesen // created the machine instruction should annotate it with <undef> flags 194b0e1bc7b99809e2b45726affd73f72c60c506ea0Jakob Stoklund Olesen // as needed. Then we can simply assert here. The REG_SEQUENCE lowering 195b0e1bc7b99809e2b45726affd73f72c60c506ea0Jakob Stoklund Olesen // is the main suspect. 1967016cf66ee21ddf3f7823d4e332b2cb84953bebdJakob Stoklund Olesen if (MO.getSubReg()) { 19763e6a488cb6c29983415221719d05fbf99e00193Jakob Stoklund Olesen mi->addRegisterDefined(interval.reg); 1987016cf66ee21ddf3f7823d4e332b2cb84953bebdJakob Stoklund Olesen // Mark all defs of interval.reg on this instruction as reading <undef>. 1997016cf66ee21ddf3f7823d4e332b2cb84953bebdJakob Stoklund Olesen for (unsigned i = MOIdx, e = mi->getNumOperands(); i != e; ++i) { 2007016cf66ee21ddf3f7823d4e332b2cb84953bebdJakob Stoklund Olesen MachineOperand &MO2 = mi->getOperand(i); 2017016cf66ee21ddf3f7823d4e332b2cb84953bebdJakob Stoklund Olesen if (MO2.isReg() && MO2.getReg() == interval.reg && MO2.getSubReg()) 2027016cf66ee21ddf3f7823d4e332b2cb84953bebdJakob Stoklund Olesen MO2.setIsUndef(); 2037016cf66ee21ddf3f7823d4e332b2cb84953bebdJakob Stoklund Olesen } 2047016cf66ee21ddf3f7823d4e332b2cb84953bebdJakob Stoklund Olesen } 20563e6a488cb6c29983415221719d05fbf99e00193Jakob Stoklund Olesen 2063b1088a2cc15a39c7a7b8dd95a56143f1dda6863Jakob Stoklund Olesen VNInfo *ValNo = interval.getNextValue(defIndex, VNInfoAllocator); 2077ecb38be0a533e7b9c7d3b8e9b5c8a6fa5f6b349Evan Cheng assert(ValNo->id == 0 && "First value in interval is not 0?"); 2081a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 2091a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // Loop over all of the blocks that the vreg is defined in. There are 2101a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // two cases we have to handle here. The most common case is a vreg 2111a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // whose lifetime is contained within a basic block. In this case there 2121a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // will be a single kill, in MBB, which comes after the definition. 2131a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos if (vi.Kills.size() == 1 && vi.Kills[0]->getParent() == mbb) { 2141a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // FIXME: what about dead vars? 215233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames SlotIndex killIdx; 2161a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos if (vi.Kills[0] != mi) 2172debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen killIdx = getInstructionIndex(vi.Kills[0]).getRegSlot(); 2181a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos else 2192debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen killIdx = defIndex.getDeadSlot(); 2201a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 2211a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // If the kill happens after the definition, we have an intra-block 2221a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // live range. 2231a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos if (killIdx > defIndex) { 224493a3d015cbb2bcc18d9293a4dec3b35c7493818Jeffrey Yasskin assert(vi.AliveBlocks.empty() && 2251a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos "Shouldn't be alive across any blocks!"); 2267ecb38be0a533e7b9c7d3b8e9b5c8a6fa5f6b349Evan Cheng LiveRange LR(defIndex, killIdx, ValNo); 2271a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos interval.addRange(LR); 2288a34229dcf484739119857988772572ef0cad9f2David Greene DEBUG(dbgs() << " +" << LR << "\n"); 2291a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos return; 2301a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 2311a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 2326097d13b2a624048dbe02e39e2dfb23bfa269b64Chris Lattner 2331a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // The other case we handle is when a virtual register lives to the end 2341a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // of the defining block, potentially live across some blocks, then is 2351a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // live into some number of blocks, but gets killed. Start by adding a 2361a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // range that goes from this definition to the end of the defining block. 23774ab5eeffbd70f2387338e3ee8195be9f73e6dd8Lang Hames LiveRange NewLR(defIndex, getMBBEndIdx(mbb), ValNo); 2388a34229dcf484739119857988772572ef0cad9f2David Greene DEBUG(dbgs() << " +" << NewLR); 2391a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos interval.addRange(NewLR); 2401a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 241dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen bool PHIJoin = lv_->isPHIJoin(interval.reg); 242dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen 243dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen if (PHIJoin) { 244dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen // A phi join register is killed at the end of the MBB and revived as a new 245dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen // valno in the killing blocks. 246dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen assert(vi.AliveBlocks.empty() && "Phi join can't pass through blocks"); 247dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen DEBUG(dbgs() << " phi-join"); 248dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen ValNo->setHasPHIKill(true); 249dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen } else { 250dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen // Iterate over all of the blocks that the variable is completely 251dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen // live in, adding [insrtIndex(begin), instrIndex(end)+4) to the 252dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen // live interval. 253dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen for (SparseBitVector<>::iterator I = vi.AliveBlocks.begin(), 254dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen E = vi.AliveBlocks.end(); I != E; ++I) { 255dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen MachineBasicBlock *aliveBlock = mf_->getBlockNumbered(*I); 256dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen LiveRange LR(getMBBStartIdx(aliveBlock), getMBBEndIdx(aliveBlock), ValNo); 257dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen interval.addRange(LR); 258dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen DEBUG(dbgs() << " +" << LR); 259dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen } 2601a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 2611a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 2621a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // Finally, this virtual register is live from the start of any killing 2631a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // block to the 'use' slot of the killing instruction. 2641a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos for (unsigned i = 0, e = vi.Kills.size(); i != e; ++i) { 2651a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos MachineInstr *Kill = vi.Kills[i]; 266dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen SlotIndex Start = getMBBStartIdx(Kill->getParent()); 2672debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen SlotIndex killIdx = getInstructionIndex(Kill).getRegSlot(); 268dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen 269dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen // Create interval with one of a NEW value number. Note that this value 270dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen // number isn't actually defined by an instruction, weird huh? :) 271dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen if (PHIJoin) { 2726e2968c85c1e162ee5bc813769eab223e3df0f15Lang Hames assert(getInstructionFromIndex(Start) == 0 && 2736e2968c85c1e162ee5bc813769eab223e3df0f15Lang Hames "PHI def index points at actual instruction."); 2743b1088a2cc15a39c7a7b8dd95a56143f1dda6863Jakob Stoklund Olesen ValNo = interval.getNextValue(Start, VNInfoAllocator); 275dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen ValNo->setIsPHIDef(true); 276dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen } 277dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen LiveRange LR(Start, killIdx, ValNo); 2781a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos interval.addRange(LR); 2798a34229dcf484739119857988772572ef0cad9f2David Greene DEBUG(dbgs() << " +" << LR); 2801a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 2811a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 2821a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } else { 2833749943648772743c9c0e852553e50e6700a0c1bEvan Cheng if (MultipleDefsBySameMI(*mi, MOIdx)) 284761fd4c1d97977c16de9f0cf921056a37b906304Nick Lewycky // Multiple defs of the same virtual register by the same instruction. 285761fd4c1d97977c16de9f0cf921056a37b906304Nick Lewycky // e.g. %reg1031:5<def>, %reg1031:6<def> = VLD1q16 %reg1024<kill>, ... 286afff40a62da19be15295c0f8ed5d4d450ccb45a5Evan Cheng // This is likely due to elimination of REG_SEQUENCE instructions. Return 287afff40a62da19be15295c0f8ed5d4d450ccb45a5Evan Cheng // here since there is nothing to do. 288afff40a62da19be15295c0f8ed5d4d450ccb45a5Evan Cheng return; 289afff40a62da19be15295c0f8ed5d4d450ccb45a5Evan Cheng 2901a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // If this is the second time we see a virtual register definition, it 2911a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // must be due to phi elimination or two addr elimination. If this is 292bf105c842450d3308d024be203ddd533f37051ecEvan Cheng // the result of two address elimination, then the vreg is one of the 293bf105c842450d3308d024be203ddd533f37051ecEvan Cheng // def-and-use register operand. 2943749943648772743c9c0e852553e50e6700a0c1bEvan Cheng 2953749943648772743c9c0e852553e50e6700a0c1bEvan Cheng // It may also be partial redef like this: 2961b2932024f098a6968645ac78d5848951d877c19Jakob Stoklund Olesen // 80 %reg1041:6<def> = VSHRNv4i16 %reg1034<kill>, 12, pred:14, pred:%reg0 2971b2932024f098a6968645ac78d5848951d877c19Jakob Stoklund Olesen // 120 %reg1041:5<def> = VSHRNv4i16 %reg1039<kill>, 12, pred:14, pred:%reg0 2983749943648772743c9c0e852553e50e6700a0c1bEvan Cheng bool PartReDef = isPartialRedef(MIIdx, MO, interval); 2993749943648772743c9c0e852553e50e6700a0c1bEvan Cheng if (PartReDef || mi->isRegTiedToUseOperand(MOIdx)) { 3001a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // If this is a two-address definition, then we have already processed 3011a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // the live range. The only problem is that we didn't realize there 3021a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // are actually two values in the live interval. Because of this we 3031a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // need to take the LiveRegion that defines this register and split it 3041a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // into two values. 305d14614e6777771f8fec3062bcaf2986c189ac84dJakob Stoklund Olesen SlotIndex RedefIndex = MIIdx.getRegSlot(MO.isEarlyClobber()); 3061a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 30735f291d2c5f80e8e713704190230064311bbbbbeLang Hames const LiveRange *OldLR = 3082debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen interval.getLiveRangeContaining(RedefIndex.getRegSlot(true)); 3097ecb38be0a533e7b9c7d3b8e9b5c8a6fa5f6b349Evan Cheng VNInfo *OldValNo = OldLR->valno; 3102debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen SlotIndex DefIndex = OldValNo->def.getRegSlot(); 3114f8ff168de12eabdeb4b9437bf9402489ecf85cbEvan Cheng 312c66d0f2a9386cc7cb3237b8e3cace2b62a9c7dc8Jakob Stoklund Olesen // Delete the previous value, which should be short and continuous, 313be4f88a8b8bb3311e0dc4cde8533763d7923c3eaChris Lattner // because the 2-addr copy must be in the same MBB as the redef. 3141a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos interval.removeRange(DefIndex, RedefIndex); 315706515727c6d024015fffded2b3109a4f0ac5299Alkis Evlogimenos 31691725b75852443923b419fd23215194cfc65dd88Chris Lattner // The new value number (#1) is defined by the instruction we claimed 31791725b75852443923b419fd23215194cfc65dd88Chris Lattner // defined value #0. 3186e2968c85c1e162ee5bc813769eab223e3df0f15Lang Hames VNInfo *ValNo = interval.createValueCopy(OldValNo, VNInfoAllocator); 319857c4e01f85601cf2084adb860616256ee47c177Lang Hames 32091725b75852443923b419fd23215194cfc65dd88Chris Lattner // Value#0 is now defined by the 2-addr instruction. 3213b1088a2cc15a39c7a7b8dd95a56143f1dda6863Jakob Stoklund Olesen OldValNo->def = RedefIndex; 3221b2932024f098a6968645ac78d5848951d877c19Jakob Stoklund Olesen 323be4f88a8b8bb3311e0dc4cde8533763d7923c3eaChris Lattner // Add the new live interval which replaces the range for the input copy. 324be4f88a8b8bb3311e0dc4cde8533763d7923c3eaChris Lattner LiveRange LR(DefIndex, RedefIndex, ValNo); 3258a34229dcf484739119857988772572ef0cad9f2David Greene DEBUG(dbgs() << " replace range with " << LR); 3261a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos interval.addRange(LR); 3271a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 3281a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // If this redefinition is dead, we need to add a dummy unit live 3291a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // range covering the def slot. 3306b098dee286cc6fe5a5a476464d92dec5602e406Owen Anderson if (MO.isDead()) 3312debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen interval.addRange(LiveRange(RedefIndex, RedefIndex.getDeadSlot(), 332233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames OldValNo)); 3331a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 3348e6179fb134af929ee7c937c82d9dc1c9a104c5fBill Wendling DEBUG({ 3358a34229dcf484739119857988772572ef0cad9f2David Greene dbgs() << " RESULT: "; 3368a34229dcf484739119857988772572ef0cad9f2David Greene interval.print(dbgs(), tri_); 3378e6179fb134af929ee7c937c82d9dc1c9a104c5fBill Wendling }); 3383749943648772743c9c0e852553e50e6700a0c1bEvan Cheng } else if (lv_->isPHIJoin(interval.reg)) { 3391a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // In the case of PHI elimination, each variable definition is only 3401a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // live until the end of the block. We've already taken care of the 3411a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // rest of the live range. 342dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen 3432debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen SlotIndex defIndex = MIIdx.getRegSlot(); 344fb11288109329cb736d9f49769581a0d0c23fe19Evan Cheng if (MO.isEarlyClobber()) 3452debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen defIndex = MIIdx.getRegSlot(true); 346752195e3c662c6b5db042cf897c984624720f3b8Evan Cheng 3473b1088a2cc15a39c7a7b8dd95a56143f1dda6863Jakob Stoklund Olesen VNInfo *ValNo = interval.getNextValue(defIndex, VNInfoAllocator); 3481b2932024f098a6968645ac78d5848951d877c19Jakob Stoklund Olesen 34974ab5eeffbd70f2387338e3ee8195be9f73e6dd8Lang Hames SlotIndex killIndex = getMBBEndIdx(mbb); 3507ecb38be0a533e7b9c7d3b8e9b5c8a6fa5f6b349Evan Cheng LiveRange LR(defIndex, killIndex, ValNo); 3511a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos interval.addRange(LR); 352857c4e01f85601cf2084adb860616256ee47c177Lang Hames ValNo->setHasPHIKill(true); 353dcfe5f30b5e262971f601a65bebcc0367fef56c5Jakob Stoklund Olesen DEBUG(dbgs() << " phi-join +" << LR); 3543749943648772743c9c0e852553e50e6700a0c1bEvan Cheng } else { 3553749943648772743c9c0e852553e50e6700a0c1bEvan Cheng llvm_unreachable("Multiply defined register"); 356dd2cc65f34f9b7bfda1cd0c42becedfc361d46f8Alkis Evlogimenos } 3571a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 358ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 3598a34229dcf484739119857988772572ef0cad9f2David Greene DEBUG(dbgs() << '\n'); 360ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos} 361ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 362af8b34dae90fd6d146a3b4a83b50751ed21f07c8Lang Hamesstatic bool isRegLiveIntoSuccessor(const MachineBasicBlock *MBB, unsigned Reg) { 363342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames for (MachineBasicBlock::const_succ_iterator SI = MBB->succ_begin(), 364342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames SE = MBB->succ_end(); 365342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames SI != SE; ++SI) { 366342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames const MachineBasicBlock* succ = *SI; 367342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames if (succ->isLiveIn(Reg)) 368342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames return true; 369342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames } 370342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames return false; 371342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames} 372342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames 373f35fef7060c465dd7b578bf6339a18e8a8911888Chris Lattnervoid LiveIntervals::handlePhysicalRegisterDef(MachineBasicBlock *MBB, 374ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos MachineBasicBlock::iterator mi, 375233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames SlotIndex MIIdx, 3766b098dee286cc6fe5a5a476464d92dec5602e406Owen Anderson MachineOperand& MO, 3773b1088a2cc15a39c7a7b8dd95a56143f1dda6863Jakob Stoklund Olesen LiveInterval &interval) { 3784314268128be6d54c9a7f0709680e5a5b40f3ab3Jakob Stoklund Olesen DEBUG(dbgs() << "\t\tregister: " << PrintReg(interval.reg, tri_)); 3791a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 380233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames SlotIndex baseIndex = MIIdx; 381d14614e6777771f8fec3062bcaf2986c189ac84dJakob Stoklund Olesen SlotIndex start = baseIndex.getRegSlot(MO.isEarlyClobber()); 382233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames SlotIndex end = start; 3831a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 3841a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // If it is not used after definition, it is considered dead at 3851a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // the instruction defining it. Hence its interval is: 3861a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // [defSlot(def), defSlot(def)+1) 38739faac2531268b8555475796c6071556670dc290Dale Johannesen // For earlyclobbers, the defSlot was pushed back one; the extra 38839faac2531268b8555475796c6071556670dc290Dale Johannesen // advance below compensates. 3896b098dee286cc6fe5a5a476464d92dec5602e406Owen Anderson if (MO.isDead()) { 3908a34229dcf484739119857988772572ef0cad9f2David Greene DEBUG(dbgs() << " dead"); 3912debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen end = start.getDeadSlot(); 392ab4b66d4c279e8cd9e448687020fc838e7881dbcChris Lattner goto exit; 3931a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 394ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 3951a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // If it is not dead on definition, it must be killed by a 3961a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // subsequent instruction. Hence its interval is: 3971a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // [defSlot(def), useSlot(kill)+1) 398233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames baseIndex = baseIndex.getNextIndex(); 3995ab6f5fe666d0e3403d9b777324d1a1999118153Chris Lattner while (++mi != MBB->end()) { 400233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames 401bd63520161629385ff5a0b037eccc770d8d15289Dale Johannesen if (mi->isDebugValue()) 402bd63520161629385ff5a0b037eccc770d8d15289Dale Johannesen continue; 403233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames if (getInstructionFromIndex(baseIndex) == 0) 404233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames baseIndex = indexes_->getNextNonNullIndex(baseIndex); 405233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames 4066130f66eaae89f8878590796977678afa8448926Evan Cheng if (mi->killsRegister(interval.reg, tri_)) { 4078a34229dcf484739119857988772572ef0cad9f2David Greene DEBUG(dbgs() << " killed"); 4082debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen end = baseIndex.getRegSlot(); 409ab4b66d4c279e8cd9e448687020fc838e7881dbcChris Lattner goto exit; 410c45288e06bfe7d0b0e74eff350d280fa6c944373Evan Cheng } else { 4111015ba7018c87f48cc7bb45a564eb4a27241e76aEvan Cheng int DefIdx = mi->findRegisterDefOperandIdx(interval.reg,false,false,tri_); 412c45288e06bfe7d0b0e74eff350d280fa6c944373Evan Cheng if (DefIdx != -1) { 413c45288e06bfe7d0b0e74eff350d280fa6c944373Evan Cheng if (mi->isRegTiedToUseOperand(DefIdx)) { 414c45288e06bfe7d0b0e74eff350d280fa6c944373Evan Cheng // Two-address instruction. 4157e899cbb9127c02c58f6e774186a533b0d00681dJakob Stoklund Olesen end = baseIndex.getRegSlot(mi->getOperand(DefIdx).isEarlyClobber()); 416c45288e06bfe7d0b0e74eff350d280fa6c944373Evan Cheng } else { 417c45288e06bfe7d0b0e74eff350d280fa6c944373Evan Cheng // Another instruction redefines the register before it is ever read. 418bd63520161629385ff5a0b037eccc770d8d15289Dale Johannesen // Then the register is essentially dead at the instruction that 419bd63520161629385ff5a0b037eccc770d8d15289Dale Johannesen // defines it. Hence its interval is: 420c45288e06bfe7d0b0e74eff350d280fa6c944373Evan Cheng // [defSlot(def), defSlot(def)+1) 4218a34229dcf484739119857988772572ef0cad9f2David Greene DEBUG(dbgs() << " dead"); 4222debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen end = start.getDeadSlot(); 423c45288e06bfe7d0b0e74eff350d280fa6c944373Evan Cheng } 424c45288e06bfe7d0b0e74eff350d280fa6c944373Evan Cheng goto exit; 425c45288e06bfe7d0b0e74eff350d280fa6c944373Evan Cheng } 426f35fef7060c465dd7b578bf6339a18e8a8911888Chris Lattner } 4271b2932024f098a6968645ac78d5848951d877c19Jakob Stoklund Olesen 428233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames baseIndex = baseIndex.getNextIndex(); 4291a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 4301b2932024f098a6968645ac78d5848951d877c19Jakob Stoklund Olesen 431342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames // If we get here the register *should* be live out. 432342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames assert(!isAllocatable(interval.reg) && "Physregs shouldn't be live out!"); 43302ba13c9897ae2b19f9201e57460d7ee2b753a0bAlkis Evlogimenos 434342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames // FIXME: We need saner rules for reserved regs. 435342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames if (isReserved(interval.reg)) { 436342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames end = start.getDeadSlot(); 437342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames } else { 438342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames // Unreserved, unallocable registers like EFLAGS can be live across basic 439342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames // block boundaries. 440af8b34dae90fd6d146a3b4a83b50751ed21f07c8Lang Hames assert(isRegLiveIntoSuccessor(MBB, interval.reg) && 441af8b34dae90fd6d146a3b4a83b50751ed21f07c8Lang Hames "Unreserved reg not live-out?"); 442342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames end = getMBBEndIdx(MBB); 443342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames } 444ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenosexit: 4451a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos assert(start < end && "did not find end of interval?"); 446f768bba43f5c036039851d2fcca8212edca18467Chris Lattner 44724a3cc4c83e5edb25fadf7b8979a26b4451795c6Evan Cheng // Already exists? Extend old live interval. 44831cc3ec3308c8fafd9865388214ae11662a71af4Jakob Stoklund Olesen VNInfo *ValNo = interval.getVNInfoAt(start); 44931cc3ec3308c8fafd9865388214ae11662a71af4Jakob Stoklund Olesen bool Extend = ValNo != 0; 45031cc3ec3308c8fafd9865388214ae11662a71af4Jakob Stoklund Olesen if (!Extend) 4513b1088a2cc15a39c7a7b8dd95a56143f1dda6863Jakob Stoklund Olesen ValNo = interval.getNextValue(start, VNInfoAllocator); 4527ecb38be0a533e7b9c7d3b8e9b5c8a6fa5f6b349Evan Cheng LiveRange LR(start, end, ValNo); 4531a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos interval.addRange(LR); 4548a34229dcf484739119857988772572ef0cad9f2David Greene DEBUG(dbgs() << " +" << LR << '\n'); 455ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos} 456ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 457f35fef7060c465dd7b578bf6339a18e8a8911888Chris Lattnervoid LiveIntervals::handleRegisterDef(MachineBasicBlock *MBB, 458f35fef7060c465dd7b578bf6339a18e8a8911888Chris Lattner MachineBasicBlock::iterator MI, 459233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames SlotIndex MIIdx, 460ef0732d25a9882c947984ae3f2afbef5463ba00fEvan Cheng MachineOperand& MO, 461ef0732d25a9882c947984ae3f2afbef5463ba00fEvan Cheng unsigned MOIdx) { 4626b098dee286cc6fe5a5a476464d92dec5602e406Owen Anderson if (TargetRegisterInfo::isVirtualRegister(MO.getReg())) 463ef0732d25a9882c947984ae3f2afbef5463ba00fEvan Cheng handleVirtualRegisterDef(MBB, MI, MIIdx, MO, MOIdx, 4646b098dee286cc6fe5a5a476464d92dec5602e406Owen Anderson getOrCreateInterval(MO.getReg())); 4653b1088a2cc15a39c7a7b8dd95a56143f1dda6863Jakob Stoklund Olesen else 466c45288e06bfe7d0b0e74eff350d280fa6c944373Evan Cheng handlePhysicalRegisterDef(MBB, MI, MIIdx, MO, 4673b1088a2cc15a39c7a7b8dd95a56143f1dda6863Jakob Stoklund Olesen getOrCreateInterval(MO.getReg())); 4684d46e1e521c0df1990ea50f8146d22bd77ea71a6Alkis Evlogimenos} 4694d46e1e521c0df1990ea50f8146d22bd77ea71a6Alkis Evlogimenos 470b371f457b0ea4a652a9f526ba4375c80ae542252Evan Chengvoid LiveIntervals::handleLiveInRegister(MachineBasicBlock *MBB, 471233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames SlotIndex MIIdx, 4724465b6f6b2ebd061f4f321e666b47d540651f686Lang Hames LiveInterval &interval) { 473342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames assert(TargetRegisterInfo::isPhysicalRegister(interval.reg) && 474342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames "Only physical registers can be live in."); 475342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames assert((!isAllocatable(interval.reg) || MBB->getParent()->begin() || 476342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames MBB->isLandingPad()) && 477342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames "Allocatable live-ins only valid for entry blocks and landing pads."); 478342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames 4794314268128be6d54c9a7f0709680e5a5b40f3ab3Jakob Stoklund Olesen DEBUG(dbgs() << "\t\tlivein register: " << PrintReg(interval.reg, tri_)); 480b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng 481b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng // Look for kills, if it reaches a def before it's killed, then it shouldn't 482b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng // be considered a livein. 483b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng MachineBasicBlock::iterator mi = MBB->begin(); 4844507f089d48c5adb454cd12b68333d5590ce05ddEvan Cheng MachineBasicBlock::iterator E = MBB->end(); 4854507f089d48c5adb454cd12b68333d5590ce05ddEvan Cheng // Skip over DBG_VALUE at the start of the MBB. 4864507f089d48c5adb454cd12b68333d5590ce05ddEvan Cheng if (mi != E && mi->isDebugValue()) { 4874507f089d48c5adb454cd12b68333d5590ce05ddEvan Cheng while (++mi != E && mi->isDebugValue()) 4884507f089d48c5adb454cd12b68333d5590ce05ddEvan Cheng ; 4894507f089d48c5adb454cd12b68333d5590ce05ddEvan Cheng if (mi == E) 4904507f089d48c5adb454cd12b68333d5590ce05ddEvan Cheng // MBB is empty except for DBG_VALUE's. 4914507f089d48c5adb454cd12b68333d5590ce05ddEvan Cheng return; 4924507f089d48c5adb454cd12b68333d5590ce05ddEvan Cheng } 4934507f089d48c5adb454cd12b68333d5590ce05ddEvan Cheng 494233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames SlotIndex baseIndex = MIIdx; 495233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames SlotIndex start = baseIndex; 496233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames if (getInstructionFromIndex(baseIndex) == 0) 497233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames baseIndex = indexes_->getNextNonNullIndex(baseIndex); 498233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames 499233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames SlotIndex end = baseIndex; 5000076c616e8abc2ecf36600a7ac20ec784420cdc4Evan Cheng bool SeenDefUse = false; 501b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng 502bd63520161629385ff5a0b037eccc770d8d15289Dale Johannesen while (mi != E) { 5031d0aeabe3fce2ce6610e988b36582b47a7684f74Dale Johannesen if (mi->killsRegister(interval.reg, tri_)) { 5041d0aeabe3fce2ce6610e988b36582b47a7684f74Dale Johannesen DEBUG(dbgs() << " killed"); 5052debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen end = baseIndex.getRegSlot(); 5061d0aeabe3fce2ce6610e988b36582b47a7684f74Dale Johannesen SeenDefUse = true; 5071d0aeabe3fce2ce6610e988b36582b47a7684f74Dale Johannesen break; 5086b7913893bcd47f52eff71e39e50c42511c4ed36Jakob Stoklund Olesen } else if (mi->modifiesRegister(interval.reg, tri_)) { 5091d0aeabe3fce2ce6610e988b36582b47a7684f74Dale Johannesen // Another instruction redefines the register before it is ever read. 5101d0aeabe3fce2ce6610e988b36582b47a7684f74Dale Johannesen // Then the register is essentially dead at the instruction that defines 5111d0aeabe3fce2ce6610e988b36582b47a7684f74Dale Johannesen // it. Hence its interval is: 5121d0aeabe3fce2ce6610e988b36582b47a7684f74Dale Johannesen // [defSlot(def), defSlot(def)+1) 5131d0aeabe3fce2ce6610e988b36582b47a7684f74Dale Johannesen DEBUG(dbgs() << " dead"); 5142debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen end = start.getDeadSlot(); 5151d0aeabe3fce2ce6610e988b36582b47a7684f74Dale Johannesen SeenDefUse = true; 5161d0aeabe3fce2ce6610e988b36582b47a7684f74Dale Johannesen break; 517bd63520161629385ff5a0b037eccc770d8d15289Dale Johannesen } 5181d0aeabe3fce2ce6610e988b36582b47a7684f74Dale Johannesen 5194507f089d48c5adb454cd12b68333d5590ce05ddEvan Cheng while (++mi != E && mi->isDebugValue()) 5204507f089d48c5adb454cd12b68333d5590ce05ddEvan Cheng // Skip over DBG_VALUE. 5214507f089d48c5adb454cd12b68333d5590ce05ddEvan Cheng ; 5224507f089d48c5adb454cd12b68333d5590ce05ddEvan Cheng if (mi != E) 523233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames baseIndex = indexes_->getNextNonNullIndex(baseIndex); 524b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng } 525b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng 52675611fb4e6ab253be30ac29a2b15e9bf8c1d146eEvan Cheng // Live-in register might not be used at all. 5270076c616e8abc2ecf36600a7ac20ec784420cdc4Evan Cheng if (!SeenDefUse) { 528af8b34dae90fd6d146a3b4a83b50751ed21f07c8Lang Hames if (isAllocatable(interval.reg) || 529af8b34dae90fd6d146a3b4a83b50751ed21f07c8Lang Hames !isRegLiveIntoSuccessor(MBB, interval.reg)) { 530af8b34dae90fd6d146a3b4a83b50751ed21f07c8Lang Hames // Allocatable registers are never live through. 531af8b34dae90fd6d146a3b4a83b50751ed21f07c8Lang Hames // Non-allocatable registers that aren't live into any successors also 532af8b34dae90fd6d146a3b4a83b50751ed21f07c8Lang Hames // aren't live through. 533342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames DEBUG(dbgs() << " dead"); 534f58e37f957191a3e41f605628c6169fbb1d4f922Lang Hames return; 535342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames } else { 536af8b34dae90fd6d146a3b4a83b50751ed21f07c8Lang Hames // If we get here the register is non-allocatable and live into some 537af8b34dae90fd6d146a3b4a83b50751ed21f07c8Lang Hames // successor. We'll conservatively assume it's live-through. 538342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames DEBUG(dbgs() << " live through"); 539342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames end = getMBBEndIdx(MBB); 540342c64c90418a97ec26303c27d1829edd994d9a9Lang Hames } 54124a3cc4c83e5edb25fadf7b8979a26b4451795c6Evan Cheng } 54224a3cc4c83e5edb25fadf7b8979a26b4451795c6Evan Cheng 5436e2968c85c1e162ee5bc813769eab223e3df0f15Lang Hames SlotIndex defIdx = getMBBStartIdx(MBB); 5446e2968c85c1e162ee5bc813769eab223e3df0f15Lang Hames assert(getInstructionFromIndex(defIdx) == 0 && 5456e2968c85c1e162ee5bc813769eab223e3df0f15Lang Hames "PHI def index points at actual instruction."); 5463b1088a2cc15a39c7a7b8dd95a56143f1dda6863Jakob Stoklund Olesen VNInfo *vni = interval.getNextValue(defIdx, VNInfoAllocator); 547d21c31610c4a10e9e638f4221b5df89ea932e258Lang Hames vni->setIsPHIDef(true); 548d21c31610c4a10e9e638f4221b5df89ea932e258Lang Hames LiveRange LR(start, end, vni); 5493de23e6f6cf337451a0934159da494d645b93133Jakob Stoklund Olesen 5509b25b8ca24d6df2e097741dcc15016772ee4eda7Jim Laskey interval.addRange(LR); 5518a34229dcf484739119857988772572ef0cad9f2David Greene DEBUG(dbgs() << " +" << LR << '\n'); 552b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng} 553b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng 554ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos/// computeIntervals - computes the live intervals for virtual 5554d46e1e521c0df1990ea50f8146d22bd77ea71a6Alkis Evlogimenos/// registers. for some ordering of the machine instructions [1,N] a 55608cec00588ec1a8fa85b208555f006d7396ae7a4Alkis Evlogimenos/// live interval is an interval [i, j) where 1 <= i <= j < N for 557ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos/// which a variable is live 5581b2932024f098a6968645ac78d5848951d877c19Jakob Stoklund Olesenvoid LiveIntervals::computeIntervals() { 5598a34229dcf484739119857988772572ef0cad9f2David Greene DEBUG(dbgs() << "********** COMPUTING LIVE INTERVALS **********\n" 5608e6179fb134af929ee7c937c82d9dc1c9a104c5fBill Wendling << "********** Function: " 5618e6179fb134af929ee7c937c82d9dc1c9a104c5fBill Wendling << ((Value*)mf_->getFunction())->getName() << '\n'); 562d129d73b725e32d2fc0c87f392c239db8801e922Evan Cheng 56334e85d0307e3c17e5061622dccf8a20e5457b099Jakob Stoklund Olesen RegMaskBlocks.resize(mf_->getNumBlockIDs()); 56434e85d0307e3c17e5061622dccf8a20e5457b099Jakob Stoklund Olesen 565d129d73b725e32d2fc0c87f392c239db8801e922Evan Cheng SmallVector<unsigned, 8> UndefUses; 566428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner for (MachineFunction::iterator MBBI = mf_->begin(), E = mf_->end(); 567428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner MBBI != E; ++MBBI) { 568428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner MachineBasicBlock *MBB = MBBI; 56934e85d0307e3c17e5061622dccf8a20e5457b099Jakob Stoklund Olesen RegMaskBlocks[MBB->getNumber()].first = RegMaskSlots.size(); 57034e85d0307e3c17e5061622dccf8a20e5457b099Jakob Stoklund Olesen 57100a99a35840451a291eb61a192a750908a4073aeEvan Cheng if (MBB->empty()) 57200a99a35840451a291eb61a192a750908a4073aeEvan Cheng continue; 57300a99a35840451a291eb61a192a750908a4073aeEvan Cheng 574134eb73fc35e6ead3cfd3ed5024d0d7efa507441Owen Anderson // Track the index of the current machine instr. 575233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames SlotIndex MIIndex = getMBBStartIdx(MBB); 576ad98f795d0dba3db721139a8a74a98acdce0ff60Bob Wilson DEBUG(dbgs() << "BB#" << MBB->getNumber() 577ad98f795d0dba3db721139a8a74a98acdce0ff60Bob Wilson << ":\t\t# derived from " << MBB->getName() << "\n"); 5781a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 579cb406c25973b4e88a6c10ad839ef1beeb3664715Dan Gohman // Create intervals for live-ins to this BB first. 58081bf03eb5cd68243eabb52505105aa5f4a831bf3Dan Gohman for (MachineBasicBlock::livein_iterator LI = MBB->livein_begin(), 581cb406c25973b4e88a6c10ad839ef1beeb3664715Dan Gohman LE = MBB->livein_end(); LI != LE; ++LI) { 582cb406c25973b4e88a6c10ad839ef1beeb3664715Dan Gohman handleLiveInRegister(MBB, MIIndex, getOrCreateInterval(*LI)); 583dffb2e83ed2546226d09c40aa43524e2392322daChris Lattner } 5841b2932024f098a6968645ac78d5848951d877c19Jakob Stoklund Olesen 58599500aeb7c9a05db57e228544a3f81de2faf24efOwen Anderson // Skip over empty initial indices. 586233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames if (getInstructionFromIndex(MIIndex) == 0) 587233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames MIIndex = indexes_->getNextNonNullIndex(MIIndex); 5881b2932024f098a6968645ac78d5848951d877c19Jakob Stoklund Olesen 5891caedd056dbc3eda1537ad8251323bd985819b80Dale Johannesen for (MachineBasicBlock::iterator MI = MBB->begin(), miEnd = MBB->end(); 5901caedd056dbc3eda1537ad8251323bd985819b80Dale Johannesen MI != miEnd; ++MI) { 5918a34229dcf484739119857988772572ef0cad9f2David Greene DEBUG(dbgs() << MIIndex << "\t" << *MI); 592518bb53485df640d7b7e3f6b0544099020c42aa7Chris Lattner if (MI->isDebugValue()) 5931caedd056dbc3eda1537ad8251323bd985819b80Dale Johannesen continue; 5943fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen assert(indexes_->getInstructionFromIndex(MIIndex) == MI && 5953fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen "Lost SlotIndex synchronization"); 5961a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 597438f7bc67cf235ccee7e6f7ac7f4ae2186eb8020Evan Cheng // Handle defs. 598428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner for (int i = MI->getNumOperands() - 1; i >= 0; --i) { 599428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner MachineOperand &MO = MI->getOperand(i); 6003fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen 6013fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen // Collect register masks. 6023fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen if (MO.isRegMask()) { 6033fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen RegMaskSlots.push_back(MIIndex.getRegSlot()); 6043fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen RegMaskBits.push_back(MO.getRegMask()); 6053fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen continue; 6063fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen } 6073fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen 608d129d73b725e32d2fc0c87f392c239db8801e922Evan Cheng if (!MO.isReg() || !MO.getReg()) 609d129d73b725e32d2fc0c87f392c239db8801e922Evan Cheng continue; 610d129d73b725e32d2fc0c87f392c239db8801e922Evan Cheng 6111a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // handle register defs - build intervals 612d129d73b725e32d2fc0c87f392c239db8801e922Evan Cheng if (MO.isDef()) 613ef0732d25a9882c947984ae3f2afbef5463ba00fEvan Cheng handleRegisterDef(MBB, MI, MIIndex, MO, i); 614d129d73b725e32d2fc0c87f392c239db8801e922Evan Cheng else if (MO.isUndef()) 615d129d73b725e32d2fc0c87f392c239db8801e922Evan Cheng UndefUses.push_back(MO.getReg()); 6161a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 6171b2932024f098a6968645ac78d5848951d877c19Jakob Stoklund Olesen 618233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames // Move to the next instr slot. 619233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames MIIndex = indexes_->getNextNonNullIndex(MIIndex); 620ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos } 62134e85d0307e3c17e5061622dccf8a20e5457b099Jakob Stoklund Olesen 62234e85d0307e3c17e5061622dccf8a20e5457b099Jakob Stoklund Olesen // Compute the number of register mask instructions in this block. 62334e85d0307e3c17e5061622dccf8a20e5457b099Jakob Stoklund Olesen std::pair<unsigned, unsigned> &RMB = RegMaskBlocks[MBB->getNumber()]; 62434e85d0307e3c17e5061622dccf8a20e5457b099Jakob Stoklund Olesen RMB.second = RegMaskSlots.size() - RMB.first;; 6251a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 626d129d73b725e32d2fc0c87f392c239db8801e922Evan Cheng 627d129d73b725e32d2fc0c87f392c239db8801e922Evan Cheng // Create empty intervals for registers defined by implicit_def's (except 628d129d73b725e32d2fc0c87f392c239db8801e922Evan Cheng // for those implicit_def that define values which are liveout of their 629d129d73b725e32d2fc0c87f392c239db8801e922Evan Cheng // blocks. 630d129d73b725e32d2fc0c87f392c239db8801e922Evan Cheng for (unsigned i = 0, e = UndefUses.size(); i != e; ++i) { 631d129d73b725e32d2fc0c87f392c239db8801e922Evan Cheng unsigned UndefReg = UndefUses[i]; 632d129d73b725e32d2fc0c87f392c239db8801e922Evan Cheng (void)getOrCreateInterval(UndefReg); 633d129d73b725e32d2fc0c87f392c239db8801e922Evan Cheng } 634ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos} 635b27ef248f579b354aab434f63c417ab1103e47e2Alkis Evlogimenos 63603857b29d8271a23943254579e6cf7b7df4b1bd3Owen AndersonLiveInterval* LiveIntervals::createInterval(unsigned reg) { 6370a1fcce09230e9b4bd30a8f07447aa075dce7470Evan Cheng float Weight = TargetRegisterInfo::isPhysicalRegister(reg) ? HUGE_VALF : 0.0F; 63803857b29d8271a23943254579e6cf7b7df4b1bd3Owen Anderson return new LiveInterval(reg, Weight); 6399a8b490735d216435862a3d52e669357f165550fAlkis Evlogimenos} 640f2fbca68f868122d6df0bfc9952b4e4c3dfb60b7Evan Cheng 6410a1fcce09230e9b4bd30a8f07447aa075dce7470Evan Cheng/// dupInterval - Duplicate a live interval. The caller is responsible for 6420a1fcce09230e9b4bd30a8f07447aa075dce7470Evan Cheng/// managing the allocated memory. 6430a1fcce09230e9b4bd30a8f07447aa075dce7470Evan ChengLiveInterval* LiveIntervals::dupInterval(LiveInterval *li) { 6440a1fcce09230e9b4bd30a8f07447aa075dce7470Evan Cheng LiveInterval *NewLI = createInterval(li->reg); 64590f95f88c6ce09c6744777dc9d140c3c77203b92Evan Cheng NewLI->Copy(*li, mri_, getVNInfoAllocator()); 6460a1fcce09230e9b4bd30a8f07447aa075dce7470Evan Cheng return NewLI; 6470a1fcce09230e9b4bd30a8f07447aa075dce7470Evan Cheng} 6480a1fcce09230e9b4bd30a8f07447aa075dce7470Evan Cheng 64911513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen/// shrinkToUses - After removing some uses of a register, shrink its live 65011513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen/// range to just the remaining uses. This method does not compute reaching 65111513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen/// defs for new uses, and it doesn't remove dead defs. 6526a3dbd3b25bbc99bd1a233d6a74ddea3493ba6acJakob Stoklund Olesenbool LiveIntervals::shrinkToUses(LiveInterval *li, 6530d8ccaa5c8db820b5b93f37e51563148c57ba6b8Jakob Stoklund Olesen SmallVectorImpl<MachineInstr*> *dead) { 65411513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen DEBUG(dbgs() << "Shrink: " << *li << '\n'); 65511513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen assert(TargetRegisterInfo::isVirtualRegister(li->reg) 656567cdbab28077ea1801ebff3d4291d4006d88ca3Lang Hames && "Can only shrink virtual registers"); 65711513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen // Find all the values used, including PHI kills. 65811513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen SmallVector<std::pair<SlotIndex, VNInfo*>, 16> WorkList; 65911513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen 660031432f9ad24963282b7f71bd0592080f6229d20Jakob Stoklund Olesen // Blocks that have already been added to WorkList as live-out. 661031432f9ad24963282b7f71bd0592080f6229d20Jakob Stoklund Olesen SmallPtrSet<MachineBasicBlock*, 16> LiveOut; 662031432f9ad24963282b7f71bd0592080f6229d20Jakob Stoklund Olesen 66311513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen // Visit all instructions reading li->reg. 66411513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen for (MachineRegisterInfo::reg_iterator I = mri_->reg_begin(li->reg); 66511513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen MachineInstr *UseMI = I.skipInstruction();) { 66611513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen if (UseMI->isDebugValue() || !UseMI->readsVirtualRegister(li->reg)) 66711513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen continue; 6686c9cc21d85cdef79b971f710ace287f3a2f847a3Jakob Stoklund Olesen SlotIndex Idx = getInstructionIndex(UseMI).getRegSlot(); 669f054e198197122011fc80b673f35333bc3e58c98Jakob Stoklund Olesen // Note: This intentionally picks up the wrong VNI in case of an EC redef. 670f054e198197122011fc80b673f35333bc3e58c98Jakob Stoklund Olesen // See below. 671f054e198197122011fc80b673f35333bc3e58c98Jakob Stoklund Olesen VNInfo *VNI = li->getVNInfoBefore(Idx); 6729ef931e71c06a0390d6387859843be1d6d4daad6Jakob Stoklund Olesen if (!VNI) { 6739ef931e71c06a0390d6387859843be1d6d4daad6Jakob Stoklund Olesen // This shouldn't happen: readsVirtualRegister returns true, but there is 6749ef931e71c06a0390d6387859843be1d6d4daad6Jakob Stoklund Olesen // no live value. It is likely caused by a target getting <undef> flags 6759ef931e71c06a0390d6387859843be1d6d4daad6Jakob Stoklund Olesen // wrong. 6769ef931e71c06a0390d6387859843be1d6d4daad6Jakob Stoklund Olesen DEBUG(dbgs() << Idx << '\t' << *UseMI 6779ef931e71c06a0390d6387859843be1d6d4daad6Jakob Stoklund Olesen << "Warning: Instr claims to read non-existent value in " 6789ef931e71c06a0390d6387859843be1d6d4daad6Jakob Stoklund Olesen << *li << '\n'); 6799ef931e71c06a0390d6387859843be1d6d4daad6Jakob Stoklund Olesen continue; 6809ef931e71c06a0390d6387859843be1d6d4daad6Jakob Stoklund Olesen } 681f054e198197122011fc80b673f35333bc3e58c98Jakob Stoklund Olesen // Special case: An early-clobber tied operand reads and writes the 682f054e198197122011fc80b673f35333bc3e58c98Jakob Stoklund Olesen // register one slot early. The getVNInfoBefore call above would have 683f054e198197122011fc80b673f35333bc3e58c98Jakob Stoklund Olesen // picked up the value defined by UseMI. Adjust the kill slot and value. 684f054e198197122011fc80b673f35333bc3e58c98Jakob Stoklund Olesen if (SlotIndex::isSameInstr(VNI->def, Idx)) { 685f054e198197122011fc80b673f35333bc3e58c98Jakob Stoklund Olesen Idx = VNI->def; 6866c9cc21d85cdef79b971f710ace287f3a2f847a3Jakob Stoklund Olesen VNI = li->getVNInfoBefore(Idx); 68711513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen assert(VNI && "Early-clobber tied value not available"); 68811513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen } 68911513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen WorkList.push_back(std::make_pair(Idx, VNI)); 69011513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen } 69111513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen 69211513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen // Create a new live interval with only minimal live segments per def. 69311513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen LiveInterval NewLI(li->reg, 0); 69411513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen for (LiveInterval::vni_iterator I = li->vni_begin(), E = li->vni_end(); 69511513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen I != E; ++I) { 69611513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen VNInfo *VNI = *I; 69711513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen if (VNI->isUnused()) 69811513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen continue; 6991f81e316b042c02c841801a71e7439e166ffa2a0Jakob Stoklund Olesen NewLI.addRange(LiveRange(VNI->def, VNI->def.getDeadSlot(), VNI)); 70011513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen } 70111513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen 702e0ab24532cc11f082d722ab169080322b39afeceJakob Stoklund Olesen // Keep track of the PHIs that are in use. 703e0ab24532cc11f082d722ab169080322b39afeceJakob Stoklund Olesen SmallPtrSet<VNInfo*, 8> UsedPHIs; 704e0ab24532cc11f082d722ab169080322b39afeceJakob Stoklund Olesen 70511513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen // Extend intervals to reach all uses in WorkList. 70611513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen while (!WorkList.empty()) { 70711513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen SlotIndex Idx = WorkList.back().first; 70811513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen VNInfo *VNI = WorkList.back().second; 70911513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen WorkList.pop_back(); 7106c9cc21d85cdef79b971f710ace287f3a2f847a3Jakob Stoklund Olesen const MachineBasicBlock *MBB = getMBBFromIndex(Idx.getPrevSlot()); 71111513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen SlotIndex BlockStart = getMBBStartIdx(MBB); 712e0ab24532cc11f082d722ab169080322b39afeceJakob Stoklund Olesen 713e0ab24532cc11f082d722ab169080322b39afeceJakob Stoklund Olesen // Extend the live range for VNI to be live at Idx. 7146c9cc21d85cdef79b971f710ace287f3a2f847a3Jakob Stoklund Olesen if (VNInfo *ExtVNI = NewLI.extendInBlock(BlockStart, Idx)) { 7154b11a70f7a63dc4c051a96a90ed6687eb0595cdaNick Lewycky (void)ExtVNI; 716e0ab24532cc11f082d722ab169080322b39afeceJakob Stoklund Olesen assert(ExtVNI == VNI && "Unexpected existing value number"); 717e0ab24532cc11f082d722ab169080322b39afeceJakob Stoklund Olesen // Is this a PHIDef we haven't seen before? 718c29d9b3495a2d87af524ad5c4b62f46c4265d828Jakob Stoklund Olesen if (!VNI->isPHIDef() || VNI->def != BlockStart || !UsedPHIs.insert(VNI)) 719e0ab24532cc11f082d722ab169080322b39afeceJakob Stoklund Olesen continue; 720e0ab24532cc11f082d722ab169080322b39afeceJakob Stoklund Olesen // The PHI is live, make sure the predecessors are live-out. 721e0ab24532cc11f082d722ab169080322b39afeceJakob Stoklund Olesen for (MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(), 722e0ab24532cc11f082d722ab169080322b39afeceJakob Stoklund Olesen PE = MBB->pred_end(); PI != PE; ++PI) { 723031432f9ad24963282b7f71bd0592080f6229d20Jakob Stoklund Olesen if (!LiveOut.insert(*PI)) 724031432f9ad24963282b7f71bd0592080f6229d20Jakob Stoklund Olesen continue; 7256c9cc21d85cdef79b971f710ace287f3a2f847a3Jakob Stoklund Olesen SlotIndex Stop = getMBBEndIdx(*PI); 726e0ab24532cc11f082d722ab169080322b39afeceJakob Stoklund Olesen // A predecessor is not required to have a live-out value for a PHI. 7276c9cc21d85cdef79b971f710ace287f3a2f847a3Jakob Stoklund Olesen if (VNInfo *PVNI = li->getVNInfoBefore(Stop)) 728e0ab24532cc11f082d722ab169080322b39afeceJakob Stoklund Olesen WorkList.push_back(std::make_pair(Stop, PVNI)); 72911513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen } 73011513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen continue; 73111513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen } 73211513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen 73311513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen // VNI is live-in to MBB. 73411513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen DEBUG(dbgs() << " live-in at " << BlockStart << '\n'); 7356c9cc21d85cdef79b971f710ace287f3a2f847a3Jakob Stoklund Olesen NewLI.addRange(LiveRange(BlockStart, Idx, VNI)); 73611513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen 73711513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen // Make sure VNI is live-out from the predecessors. 73811513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen for (MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(), 73911513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen PE = MBB->pred_end(); PI != PE; ++PI) { 740031432f9ad24963282b7f71bd0592080f6229d20Jakob Stoklund Olesen if (!LiveOut.insert(*PI)) 741031432f9ad24963282b7f71bd0592080f6229d20Jakob Stoklund Olesen continue; 7426c9cc21d85cdef79b971f710ace287f3a2f847a3Jakob Stoklund Olesen SlotIndex Stop = getMBBEndIdx(*PI); 7436c9cc21d85cdef79b971f710ace287f3a2f847a3Jakob Stoklund Olesen assert(li->getVNInfoBefore(Stop) == VNI && 7446c9cc21d85cdef79b971f710ace287f3a2f847a3Jakob Stoklund Olesen "Wrong value out of predecessor"); 74511513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen WorkList.push_back(std::make_pair(Stop, VNI)); 74611513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen } 74711513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen } 74811513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen 74911513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen // Handle dead values. 7506a3dbd3b25bbc99bd1a233d6a74ddea3493ba6acJakob Stoklund Olesen bool CanSeparate = false; 75111513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen for (LiveInterval::vni_iterator I = li->vni_begin(), E = li->vni_end(); 75211513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen I != E; ++I) { 75311513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen VNInfo *VNI = *I; 75411513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen if (VNI->isUnused()) 75511513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen continue; 75611513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen LiveInterval::iterator LII = NewLI.FindLiveRangeContaining(VNI->def); 75711513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen assert(LII != NewLI.end() && "Missing live range for PHI"); 7581f81e316b042c02c841801a71e7439e166ffa2a0Jakob Stoklund Olesen if (LII->end != VNI->def.getDeadSlot()) 75911513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen continue; 760a4d347357ce04d9101130dca0df33cb62ea35a2fJakob Stoklund Olesen if (VNI->isPHIDef()) { 76111513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen // This is a dead PHI. Remove it. 76211513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen VNI->setIsUnused(true); 76311513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen NewLI.removeRange(*LII); 7646a3dbd3b25bbc99bd1a233d6a74ddea3493ba6acJakob Stoklund Olesen DEBUG(dbgs() << "Dead PHI at " << VNI->def << " may separate interval\n"); 7656a3dbd3b25bbc99bd1a233d6a74ddea3493ba6acJakob Stoklund Olesen CanSeparate = true; 76611513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen } else { 76711513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen // This is a dead def. Make sure the instruction knows. 76811513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen MachineInstr *MI = getInstructionFromIndex(VNI->def); 76911513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen assert(MI && "No instruction defining live value"); 77011513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen MI->addRegisterDead(li->reg, tri_); 7710d8ccaa5c8db820b5b93f37e51563148c57ba6b8Jakob Stoklund Olesen if (dead && MI->allDefsAreDead()) { 772c46570dc05851395829bef904bb6ddb1260400d1Jakob Stoklund Olesen DEBUG(dbgs() << "All defs dead: " << VNI->def << '\t' << *MI); 7730d8ccaa5c8db820b5b93f37e51563148c57ba6b8Jakob Stoklund Olesen dead->push_back(MI); 7740d8ccaa5c8db820b5b93f37e51563148c57ba6b8Jakob Stoklund Olesen } 77511513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen } 77611513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen } 77711513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen 77811513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen // Move the trimmed ranges back. 77911513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen li->ranges.swap(NewLI.ranges); 780c46570dc05851395829bef904bb6ddb1260400d1Jakob Stoklund Olesen DEBUG(dbgs() << "Shrunk: " << *li << '\n'); 7816a3dbd3b25bbc99bd1a233d6a74ddea3493ba6acJakob Stoklund Olesen return CanSeparate; 78211513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen} 78311513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen 78411513e5d1e1b40e6113668e4b4357596f33fa6c6Jakob Stoklund Olesen 785f2fbca68f868122d6df0bfc9952b4e4c3dfb60b7Evan Cheng//===----------------------------------------------------------------------===// 786f2fbca68f868122d6df0bfc9952b4e4c3dfb60b7Evan Cheng// Register allocator hooks. 787f2fbca68f868122d6df0bfc9952b4e4c3dfb60b7Evan Cheng// 788f2fbca68f868122d6df0bfc9952b4e4c3dfb60b7Evan Cheng 7898a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesenvoid LiveIntervals::addKillFlags() { 7908a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesen for (iterator I = begin(), E = end(); I != E; ++I) { 7918a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesen unsigned Reg = I->first; 7928a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesen if (TargetRegisterInfo::isPhysicalRegister(Reg)) 7938a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesen continue; 7948a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesen if (mri_->reg_nodbg_empty(Reg)) 7958a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesen continue; 7968a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesen LiveInterval *LI = I->second; 7978a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesen 7988a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesen // Every instruction that kills Reg corresponds to a live range end point. 7998a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesen for (LiveInterval::iterator RI = LI->begin(), RE = LI->end(); RI != RE; 8008a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesen ++RI) { 8012debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen // A block index indicates an MBB edge. 8022debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen if (RI->end.isBlock()) 8038a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesen continue; 8048a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesen MachineInstr *MI = getInstructionFromIndex(RI->end); 8058a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesen if (!MI) 8068a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesen continue; 8078a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesen MI->addRegisterKilled(Reg, NULL); 8088a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesen } 8098a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesen } 8108a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesen} 8118a61da8a689ee95874c833af4c7aa965fab5c0a9Jakob Stoklund Olesen 812d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng/// getReMatImplicitUse - If the remat definition MI has one (for now, we only 813d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng/// allow one) virtual register operand, then its uses are implicitly using 814d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng/// the register. Returns the virtual register. 815d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Chengunsigned LiveIntervals::getReMatImplicitUse(const LiveInterval &li, 816d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng MachineInstr *MI) const { 817d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng unsigned RegOp = 0; 818d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { 819d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng MachineOperand &MO = MI->getOperand(i); 820d735b8019b0f297d7c14b55adcd887af24d8e602Dan Gohman if (!MO.isReg() || !MO.isUse()) 821d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng continue; 822d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng unsigned Reg = MO.getReg(); 823d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng if (Reg == 0 || Reg == li.reg) 824d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng continue; 8251b2932024f098a6968645ac78d5848951d877c19Jakob Stoklund Olesen 826cd339b71ff23327f2ef6a4c964ff3ceea20733bfLang Hames if (TargetRegisterInfo::isPhysicalRegister(Reg) && !isAllocatable(Reg)) 8271873d0c2257b18451c5bb35577f929d0723433a0Chris Lattner continue; 828d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng RegOp = MO.getReg(); 8296c76e80753cfc83dc6804fcd5d949c517dfe3434Lang Hames break; // Found vreg operand - leave the loop. 830d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng } 831d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng return RegOp; 832d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng} 833d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng 834d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng/// isValNoAvailableAt - Return true if the val# of the specified interval 835d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng/// which reaches the given instruction also reaches the specified use index. 836d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Chengbool LiveIntervals::isValNoAvailableAt(const LiveInterval &li, MachineInstr *MI, 837233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames SlotIndex UseIdx) const { 83831cc3ec3308c8fafd9865388214ae11662a71af4Jakob Stoklund Olesen VNInfo *UValNo = li.getVNInfoAt(UseIdx); 83931cc3ec3308c8fafd9865388214ae11662a71af4Jakob Stoklund Olesen return UValNo && UValNo == li.getVNInfoAt(getInstructionIndex(MI)); 840d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng} 841d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng 842f2fbca68f868122d6df0bfc9952b4e4c3dfb60b7Evan Cheng/// isReMaterializable - Returns true if the definition MI of the specified 843f2fbca68f868122d6df0bfc9952b4e4c3dfb60b7Evan Cheng/// val# of the specified interval is re-materializable. 844f4baeaf8485f01beda46d29fd55753199dc68070Andrew Trickbool 845f4baeaf8485f01beda46d29fd55753199dc68070Andrew TrickLiveIntervals::isReMaterializable(const LiveInterval &li, 846f4baeaf8485f01beda46d29fd55753199dc68070Andrew Trick const VNInfo *ValNo, MachineInstr *MI, 84738f6bd0fc8095ef79a89b3db15ff6dc734ac90e7Jakob Stoklund Olesen const SmallVectorImpl<LiveInterval*> *SpillIs, 848f4baeaf8485f01beda46d29fd55753199dc68070Andrew Trick bool &isLoad) { 849f2fbca68f868122d6df0bfc9952b4e4c3dfb60b7Evan Cheng if (DisableReMat) 850f2fbca68f868122d6df0bfc9952b4e4c3dfb60b7Evan Cheng return false; 851f2fbca68f868122d6df0bfc9952b4e4c3dfb60b7Evan Cheng 852a70dca156fa76d452f54829b5c5f962ddfd94ef2Dan Gohman if (!tii_->isTriviallyReMaterializable(MI, aa_)) 853a70dca156fa76d452f54829b5c5f962ddfd94ef2Dan Gohman return false; 854f2fbca68f868122d6df0bfc9952b4e4c3dfb60b7Evan Cheng 855a70dca156fa76d452f54829b5c5f962ddfd94ef2Dan Gohman // Target-specific code can mark an instruction as being rematerializable 856a70dca156fa76d452f54829b5c5f962ddfd94ef2Dan Gohman // if it has one virtual reg use, though it had better be something like 857a70dca156fa76d452f54829b5c5f962ddfd94ef2Dan Gohman // a PIC base register which is likely to be live everywhere. 8586d69ba8a6901c69d78488cbc41f8dbf080618fdeDan Gohman unsigned ImpUse = getReMatImplicitUse(li, MI); 8596d69ba8a6901c69d78488cbc41f8dbf080618fdeDan Gohman if (ImpUse) { 8606d69ba8a6901c69d78488cbc41f8dbf080618fdeDan Gohman const LiveInterval &ImpLi = getInterval(ImpUse); 86128a1e486907104b85c5787345914917d74f0cf77Evan Cheng for (MachineRegisterInfo::use_nodbg_iterator 86228a1e486907104b85c5787345914917d74f0cf77Evan Cheng ri = mri_->use_nodbg_begin(li.reg), re = mri_->use_nodbg_end(); 86328a1e486907104b85c5787345914917d74f0cf77Evan Cheng ri != re; ++ri) { 8646d69ba8a6901c69d78488cbc41f8dbf080618fdeDan Gohman MachineInstr *UseMI = &*ri; 865233a60ec40b41027ff429e2f2c27fa2be762f2e9Lang Hames SlotIndex UseIdx = getInstructionIndex(UseMI); 86631cc3ec3308c8fafd9865388214ae11662a71af4Jakob Stoklund Olesen if (li.getVNInfoAt(UseIdx) != ValNo) 8676d69ba8a6901c69d78488cbc41f8dbf080618fdeDan Gohman continue; 8686d69ba8a6901c69d78488cbc41f8dbf080618fdeDan Gohman if (!isValNoAvailableAt(ImpLi, MI, UseIdx)) 8696d69ba8a6901c69d78488cbc41f8dbf080618fdeDan Gohman return false; 8706d69ba8a6901c69d78488cbc41f8dbf080618fdeDan Gohman } 871dc37786595beedd0a68d8e2cbd91ae53ad58d133Evan Cheng 872dc37786595beedd0a68d8e2cbd91ae53ad58d133Evan Cheng // If a register operand of the re-materialized instruction is going to 873dc37786595beedd0a68d8e2cbd91ae53ad58d133Evan Cheng // be spilled next, then it's not legal to re-materialize this instruction. 87438f6bd0fc8095ef79a89b3db15ff6dc734ac90e7Jakob Stoklund Olesen if (SpillIs) 87538f6bd0fc8095ef79a89b3db15ff6dc734ac90e7Jakob Stoklund Olesen for (unsigned i = 0, e = SpillIs->size(); i != e; ++i) 87638f6bd0fc8095ef79a89b3db15ff6dc734ac90e7Jakob Stoklund Olesen if (ImpUse == (*SpillIs)[i]->reg) 87738f6bd0fc8095ef79a89b3db15ff6dc734ac90e7Jakob Stoklund Olesen return false; 8786d69ba8a6901c69d78488cbc41f8dbf080618fdeDan Gohman } 8796d69ba8a6901c69d78488cbc41f8dbf080618fdeDan Gohman return true; 8805ef3a04b542c4e585276768fa9ca2af698ef5c87Evan Cheng} 8815ef3a04b542c4e585276768fa9ca2af698ef5c87Evan Cheng 8825ef3a04b542c4e585276768fa9ca2af698ef5c87Evan Cheng/// isReMaterializable - Returns true if every definition of MI of every 8835ef3a04b542c4e585276768fa9ca2af698ef5c87Evan Cheng/// val# of the specified interval is re-materializable. 884f4baeaf8485f01beda46d29fd55753199dc68070Andrew Trickbool 885f4baeaf8485f01beda46d29fd55753199dc68070Andrew TrickLiveIntervals::isReMaterializable(const LiveInterval &li, 88638f6bd0fc8095ef79a89b3db15ff6dc734ac90e7Jakob Stoklund Olesen const SmallVectorImpl<LiveInterval*> *SpillIs, 887f4baeaf8485f01beda46d29fd55753199dc68070Andrew Trick bool &isLoad) { 8885ef3a04b542c4e585276768fa9ca2af698ef5c87Evan Cheng isLoad = false; 8895ef3a04b542c4e585276768fa9ca2af698ef5c87Evan Cheng for (LiveInterval::const_vni_iterator i = li.vni_begin(), e = li.vni_end(); 8905ef3a04b542c4e585276768fa9ca2af698ef5c87Evan Cheng i != e; ++i) { 8915ef3a04b542c4e585276768fa9ca2af698ef5c87Evan Cheng const VNInfo *VNI = *i; 892857c4e01f85601cf2084adb860616256ee47c177Lang Hames if (VNI->isUnused()) 8935ef3a04b542c4e585276768fa9ca2af698ef5c87Evan Cheng continue; // Dead val#. 8945ef3a04b542c4e585276768fa9ca2af698ef5c87Evan Cheng // Is the def for the val# rematerializable? 895857c4e01f85601cf2084adb860616256ee47c177Lang Hames MachineInstr *ReMatDefMI = getInstructionFromIndex(VNI->def); 8966e2968c85c1e162ee5bc813769eab223e3df0f15Lang Hames if (!ReMatDefMI) 8976e2968c85c1e162ee5bc813769eab223e3df0f15Lang Hames return false; 8985ef3a04b542c4e585276768fa9ca2af698ef5c87Evan Cheng bool DefIsLoad = false; 899d70dbb5d627a0408eccf88033143efa62ee0e6c0Evan Cheng if (!ReMatDefMI || 900dc37786595beedd0a68d8e2cbd91ae53ad58d133Evan Cheng !isReMaterializable(li, VNI, ReMatDefMI, SpillIs, DefIsLoad)) 901f2fbca68f868122d6df0bfc9952b4e4c3dfb60b7Evan Cheng return false; 9025ef3a04b542c4e585276768fa9ca2af698ef5c87Evan Cheng isLoad |= DefIsLoad; 903f2fbca68f868122d6df0bfc9952b4e4c3dfb60b7Evan Cheng } 904f2fbca68f868122d6df0bfc9952b4e4c3dfb60b7Evan Cheng return true; 905f2fbca68f868122d6df0bfc9952b4e4c3dfb60b7Evan Cheng} 906f2fbca68f868122d6df0bfc9952b4e4c3dfb60b7Evan Cheng 907ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund OlesenMachineBasicBlock* 908ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund OlesenLiveIntervals::intervalIsInOneMBB(const LiveInterval &LI) const { 909ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund Olesen // A local live range must be fully contained inside the block, meaning it is 910ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund Olesen // defined and killed at instructions, not at block boundaries. It is not 911ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund Olesen // live in or or out of any block. 912ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund Olesen // 913ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund Olesen // It is technically possible to have a PHI-defined live range identical to a 914ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund Olesen // single block, but we are going to return false in that case. 915ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund Olesen 916ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund Olesen SlotIndex Start = LI.beginIndex(); 917ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund Olesen if (Start.isBlock()) 918ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund Olesen return NULL; 919ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund Olesen 920ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund Olesen SlotIndex Stop = LI.endIndex(); 921ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund Olesen if (Stop.isBlock()) 922ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund Olesen return NULL; 923ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund Olesen 924ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund Olesen // getMBBFromIndex doesn't need to search the MBB table when both indexes 925ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund Olesen // belong to proper instructions. 926ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund Olesen MachineBasicBlock *MBB1 = indexes_->getMBBFromIndex(Start); 927ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund Olesen MachineBasicBlock *MBB2 = indexes_->getMBBFromIndex(Stop); 928ebf2750a70df4261d3e66144ea6bcb49d41f6efbJakob Stoklund Olesen return MBB1 == MBB2 ? MBB1 : NULL; 92981a038218171860ee4c382849c647d3dc841fe8bEvan Cheng} 93081a038218171860ee4c382849c647d3dc841fe8bEvan Cheng 931e5d90416ee1a4f45eba80789a7a3cbc3d497a4cdJakob Stoklund Olesenfloat 932e5d90416ee1a4f45eba80789a7a3cbc3d497a4cdJakob Stoklund OlesenLiveIntervals::getSpillWeight(bool isDef, bool isUse, unsigned loopDepth) { 933e5d90416ee1a4f45eba80789a7a3cbc3d497a4cdJakob Stoklund Olesen // Limit the loop depth ridiculousness. 934e5d90416ee1a4f45eba80789a7a3cbc3d497a4cdJakob Stoklund Olesen if (loopDepth > 200) 935e5d90416ee1a4f45eba80789a7a3cbc3d497a4cdJakob Stoklund Olesen loopDepth = 200; 936e5d90416ee1a4f45eba80789a7a3cbc3d497a4cdJakob Stoklund Olesen 937e5d90416ee1a4f45eba80789a7a3cbc3d497a4cdJakob Stoklund Olesen // The loop depth is used to roughly estimate the number of times the 938e5d90416ee1a4f45eba80789a7a3cbc3d497a4cdJakob Stoklund Olesen // instruction is executed. Something like 10^d is simple, but will quickly 939e5d90416ee1a4f45eba80789a7a3cbc3d497a4cdJakob Stoklund Olesen // overflow a float. This expression behaves like 10^d for small d, but is 940e5d90416ee1a4f45eba80789a7a3cbc3d497a4cdJakob Stoklund Olesen // more tempered for large d. At d=200 we get 6.7e33 which leaves a bit of 941e5d90416ee1a4f45eba80789a7a3cbc3d497a4cdJakob Stoklund Olesen // headroom before overflow. 942dc5198bac7e3f9b61617c8c46a1c28a84daa9325NAKAMURA Takumi // By the way, powf() might be unavailable here. For consistency, 943dc5198bac7e3f9b61617c8c46a1c28a84daa9325NAKAMURA Takumi // We may take pow(double,double). 944dc5198bac7e3f9b61617c8c46a1c28a84daa9325NAKAMURA Takumi float lc = std::pow(1 + (100.0 / (loopDepth + 10)), (double)loopDepth); 945e5d90416ee1a4f45eba80789a7a3cbc3d497a4cdJakob Stoklund Olesen 946e5d90416ee1a4f45eba80789a7a3cbc3d497a4cdJakob Stoklund Olesen return (isDef + isUse) * lc; 947e5d90416ee1a4f45eba80789a7a3cbc3d497a4cdJakob Stoklund Olesen} 948e5d90416ee1a4f45eba80789a7a3cbc3d497a4cdJakob Stoklund Olesen 949c4dc132c8a787fc41b6a162121251234aa618965Owen AndersonLiveRange LiveIntervals::addLiveRangeToEndOfBlock(unsigned reg, 950ffd1326ff8dfc652a8026c3faebf55bbba7c32c7Lang Hames MachineInstr* startInst) { 951c4dc132c8a787fc41b6a162121251234aa618965Owen Anderson LiveInterval& Interval = getOrCreateInterval(reg); 952c4dc132c8a787fc41b6a162121251234aa618965Owen Anderson VNInfo* VN = Interval.getNextValue( 9532debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen SlotIndex(getInstructionIndex(startInst).getRegSlot()), 9543b1088a2cc15a39c7a7b8dd95a56143f1dda6863Jakob Stoklund Olesen getVNInfoAllocator()); 955857c4e01f85601cf2084adb860616256ee47c177Lang Hames VN->setHasPHIKill(true); 9568651125d2885f74546b6e2a556082111d5b75da3Lang Hames LiveRange LR( 9572debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen SlotIndex(getInstructionIndex(startInst).getRegSlot()), 95874ab5eeffbd70f2387338e3ee8195be9f73e6dd8Lang Hames getMBBEndIdx(startInst->getParent()), VN); 959c4dc132c8a787fc41b6a162121251234aa618965Owen Anderson Interval.addRange(LR); 9601b2932024f098a6968645ac78d5848951d877c19Jakob Stoklund Olesen 961c4dc132c8a787fc41b6a162121251234aa618965Owen Anderson return LR; 962c4dc132c8a787fc41b6a162121251234aa618965Owen Anderson} 9633fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen 9643fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen 9653fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen//===----------------------------------------------------------------------===// 9663fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen// Register mask functions 9673fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen//===----------------------------------------------------------------------===// 9683fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen 9693fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesenbool LiveIntervals::checkRegMaskInterference(LiveInterval &LI, 9703fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen BitVector &UsableRegs) { 9713fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen if (LI.empty()) 9723fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen return false; 9739f10ac63a3a2a74ac381a05d8ba0f7b1b455a6b6Jakob Stoklund Olesen LiveInterval::iterator LiveI = LI.begin(), LiveE = LI.end(); 9749f10ac63a3a2a74ac381a05d8ba0f7b1b455a6b6Jakob Stoklund Olesen 9759f10ac63a3a2a74ac381a05d8ba0f7b1b455a6b6Jakob Stoklund Olesen // Use a smaller arrays for local live ranges. 9769f10ac63a3a2a74ac381a05d8ba0f7b1b455a6b6Jakob Stoklund Olesen ArrayRef<SlotIndex> Slots; 9779f10ac63a3a2a74ac381a05d8ba0f7b1b455a6b6Jakob Stoklund Olesen ArrayRef<const uint32_t*> Bits; 9789f10ac63a3a2a74ac381a05d8ba0f7b1b455a6b6Jakob Stoklund Olesen if (MachineBasicBlock *MBB = intervalIsInOneMBB(LI)) { 9799f10ac63a3a2a74ac381a05d8ba0f7b1b455a6b6Jakob Stoklund Olesen Slots = getRegMaskSlotsInBlock(MBB->getNumber()); 9809f10ac63a3a2a74ac381a05d8ba0f7b1b455a6b6Jakob Stoklund Olesen Bits = getRegMaskBitsInBlock(MBB->getNumber()); 9819f10ac63a3a2a74ac381a05d8ba0f7b1b455a6b6Jakob Stoklund Olesen } else { 9829f10ac63a3a2a74ac381a05d8ba0f7b1b455a6b6Jakob Stoklund Olesen Slots = getRegMaskSlots(); 9839f10ac63a3a2a74ac381a05d8ba0f7b1b455a6b6Jakob Stoklund Olesen Bits = getRegMaskBits(); 9849f10ac63a3a2a74ac381a05d8ba0f7b1b455a6b6Jakob Stoklund Olesen } 9853fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen 9863fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen // We are going to enumerate all the register mask slots contained in LI. 9873fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen // Start with a binary search of RegMaskSlots to find a starting point. 9883fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen ArrayRef<SlotIndex>::iterator SlotI = 9893fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen std::lower_bound(Slots.begin(), Slots.end(), LiveI->start); 9903fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen ArrayRef<SlotIndex>::iterator SlotE = Slots.end(); 9913fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen 9923fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen // No slots in range, LI begins after the last call. 9933fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen if (SlotI == SlotE) 9943fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen return false; 9953fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen 9963fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen bool Found = false; 9973fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen for (;;) { 9983fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen assert(*SlotI >= LiveI->start); 9993fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen // Loop over all slots overlapping this segment. 10003fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen while (*SlotI < LiveI->end) { 10013fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen // *SlotI overlaps LI. Collect mask bits. 10023fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen if (!Found) { 10033fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen // This is the first overlap. Initialize UsableRegs to all ones. 10043fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen UsableRegs.clear(); 10053fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen UsableRegs.resize(tri_->getNumRegs(), true); 10063fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen Found = true; 10073fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen } 10083fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen // Remove usable registers clobbered by this mask. 10099f10ac63a3a2a74ac381a05d8ba0f7b1b455a6b6Jakob Stoklund Olesen UsableRegs.clearBitsNotInMask(Bits[SlotI-Slots.begin()]); 10103fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen if (++SlotI == SlotE) 10113fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen return Found; 10123fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen } 10133fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen // *SlotI is beyond the current LI segment. 10143fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen LiveI = LI.advanceTo(LiveI, *SlotI); 10153fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen if (LiveI == LiveE) 10163fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen return Found; 10173fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen // Advance SlotI until it overlaps. 10183fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen while (*SlotI < LiveI->start) 10193fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen if (++SlotI == SlotE) 10203fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen return Found; 10213fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen } 10223fd3a840c50fe4ede1b200be18990bc955c536fdJakob Stoklund Olesen} 10233dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 10243dc7c5138d219048d69952bead22f75efb984fa3Lang Hames//===----------------------------------------------------------------------===// 10253dc7c5138d219048d69952bead22f75efb984fa3Lang Hames// IntervalUpdate class. 10263dc7c5138d219048d69952bead22f75efb984fa3Lang Hames//===----------------------------------------------------------------------===// 10273dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 10283dc7c5138d219048d69952bead22f75efb984fa3Lang Hames/// HMEditor is a toolkit used by handleMove to trim or extend live intervals. 10293dc7c5138d219048d69952bead22f75efb984fa3Lang Hamesclass LiveIntervals::HMEditor { 10303dc7c5138d219048d69952bead22f75efb984fa3Lang Hamesprivate: 10313dc7c5138d219048d69952bead22f75efb984fa3Lang Hames LiveIntervals& lis; 10323dc7c5138d219048d69952bead22f75efb984fa3Lang Hames SlotIndex newIdx; 10333dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 10343dc7c5138d219048d69952bead22f75efb984fa3Lang Hamespublic: 10353dc7c5138d219048d69952bead22f75efb984fa3Lang Hames HMEditor(LiveIntervals& lis, SlotIndex newIdx) 10363dc7c5138d219048d69952bead22f75efb984fa3Lang Hames : lis(lis), newIdx(newIdx) {} 10373dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 10383dc7c5138d219048d69952bead22f75efb984fa3Lang Hames // Update lr to be defined at newIdx. Preserves lr. 10393dc7c5138d219048d69952bead22f75efb984fa3Lang Hames void moveDef(LiveRange& lr, LiveInterval& li) { 10403dc7c5138d219048d69952bead22f75efb984fa3Lang Hames lr.start = newIdx.getRegSlot(); 10413dc7c5138d219048d69952bead22f75efb984fa3Lang Hames lr.valno->def = newIdx.getRegSlot(); 10423dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(intervalRangesSane(li) && "Broke live interval moving def."); 10433dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 10443dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 10453dc7c5138d219048d69952bead22f75efb984fa3Lang Hames // Removes lr from li, inserting a new dead-def range starting at newIdx. 10463dc7c5138d219048d69952bead22f75efb984fa3Lang Hames void moveDeadDefOrEC(LiveRange& lr, LiveInterval& li, bool isEC) { 10473dc7c5138d219048d69952bead22f75efb984fa3Lang Hames LiveRange t(lr); 10483dc7c5138d219048d69952bead22f75efb984fa3Lang Hames t.start = newIdx.getRegSlot(isEC); 10493dc7c5138d219048d69952bead22f75efb984fa3Lang Hames t.valno->def = newIdx.getRegSlot(isEC); 10503dc7c5138d219048d69952bead22f75efb984fa3Lang Hames t.end = isEC ? newIdx.getRegSlot() : newIdx.getDeadSlot(); 10513dc7c5138d219048d69952bead22f75efb984fa3Lang Hames li.removeRange(lr); 10523dc7c5138d219048d69952bead22f75efb984fa3Lang Hames li.addRange(t); 10533dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(intervalRangesSane(li) && "Broke live interval moving dead def."); 10543dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 10553dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 10563dc7c5138d219048d69952bead22f75efb984fa3Lang Hames void moveUseDown(SlotIndex oldIdx, LiveRange& lr, LiveInterval& li, 10573dc7c5138d219048d69952bead22f75efb984fa3Lang Hames const MachineBasicBlock* mbb) { 10583dc7c5138d219048d69952bead22f75efb984fa3Lang Hames bool liveThrough = lr.end > oldIdx.getRegSlot(); 10593dc7c5138d219048d69952bead22f75efb984fa3Lang Hames if (!liveThrough) { 10603dc7c5138d219048d69952bead22f75efb984fa3Lang Hames // Easy fix - just update the range endpoint. 10613dc7c5138d219048d69952bead22f75efb984fa3Lang Hames lr.end = newIdx.getRegSlot(); 10623dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } else { 10633dc7c5138d219048d69952bead22f75efb984fa3Lang Hames bool liveOut = lr.end >= lis.getSlotIndexes()->getMBBEndIdx(mbb); 10643dc7c5138d219048d69952bead22f75efb984fa3Lang Hames if (!liveOut) { 10653dc7c5138d219048d69952bead22f75efb984fa3Lang Hames moveKillFlags(li.reg, lr.end, newIdx); 10663dc7c5138d219048d69952bead22f75efb984fa3Lang Hames lr.end = newIdx.getRegSlot(); 10673dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 10683dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 10693dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(intervalRangesSane(li) && "Broke live interval moving use."); 10703dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 10713dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 10723dc7c5138d219048d69952bead22f75efb984fa3Lang Hames void moveUseUp(SlotIndex oldIdx, LiveRange& lr, LiveInterval& li) { 10733dc7c5138d219048d69952bead22f75efb984fa3Lang Hames bool liveThrough = lr.end > oldIdx.getRegSlot(); 10743dc7c5138d219048d69952bead22f75efb984fa3Lang Hames if (liveThrough) 10753dc7c5138d219048d69952bead22f75efb984fa3Lang Hames return; // If we moving up and live through there's nothing to do. 10763dc7c5138d219048d69952bead22f75efb984fa3Lang Hames SlotIndex lastUseInRange = newIdx.getRegSlot(); 10773dc7c5138d219048d69952bead22f75efb984fa3Lang Hames for (MachineRegisterInfo::use_nodbg_iterator 10783dc7c5138d219048d69952bead22f75efb984fa3Lang Hames useI = lis.mri_->use_nodbg_begin(li.reg), 10793dc7c5138d219048d69952bead22f75efb984fa3Lang Hames useE = lis.mri_->use_nodbg_end(); 10803dc7c5138d219048d69952bead22f75efb984fa3Lang Hames useI != useE; ++useI) { 10813dc7c5138d219048d69952bead22f75efb984fa3Lang Hames const MachineInstr* mopI = &*useI; 10823dc7c5138d219048d69952bead22f75efb984fa3Lang Hames const MachineOperand& mop = useI.getOperand(); 10833dc7c5138d219048d69952bead22f75efb984fa3Lang Hames SlotIndex instSlot = lis.getSlotIndexes()->getInstructionIndex(mopI); 10843dc7c5138d219048d69952bead22f75efb984fa3Lang Hames SlotIndex opSlot = instSlot.getRegSlot(mop.isEarlyClobber()); 10853dc7c5138d219048d69952bead22f75efb984fa3Lang Hames if (opSlot > lastUseInRange && opSlot < oldIdx) 10863dc7c5138d219048d69952bead22f75efb984fa3Lang Hames lastUseInRange = opSlot; 10873dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 10883dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 10893dc7c5138d219048d69952bead22f75efb984fa3Lang Hames // If we found a new instr endpoint update the kill flags. 10903dc7c5138d219048d69952bead22f75efb984fa3Lang Hames if (lastUseInRange != newIdx.getRegSlot()) 10913dc7c5138d219048d69952bead22f75efb984fa3Lang Hames moveKillFlags(li.reg, newIdx, lastUseInRange); 10923dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 10933dc7c5138d219048d69952bead22f75efb984fa3Lang Hames // Fix up the range end. 10943dc7c5138d219048d69952bead22f75efb984fa3Lang Hames lr.end = lastUseInRange; 10953dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 10963dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(intervalRangesSane(li) && "Broke live interval moving use."); 10973dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 10983dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 10993dc7c5138d219048d69952bead22f75efb984fa3Lang Hames // Update intervals for all operands of mi from oldIndex to newIndex. 1100fbc8dd306aa7699a866db278db08d842762b2dc2Lang Hames void moveAllOperandsFrom(MachineInstr* mi, SlotIndex oldIdx) { 11013dc7c5138d219048d69952bead22f75efb984fa3Lang Hames // Figure out the direction we're moving. 11023dc7c5138d219048d69952bead22f75efb984fa3Lang Hames bool movingUp = newIdx < oldIdx; 11033dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 11043dc7c5138d219048d69952bead22f75efb984fa3Lang Hames // Collect the operands. 11053dc7c5138d219048d69952bead22f75efb984fa3Lang Hames DenseSet<unsigned> uses, defs, deadDefs, ecs; 11063dc7c5138d219048d69952bead22f75efb984fa3Lang Hames for (MachineInstr::mop_iterator mopItr = mi->operands_begin(), 11073dc7c5138d219048d69952bead22f75efb984fa3Lang Hames mopEnd = mi->operands_end(); 11083dc7c5138d219048d69952bead22f75efb984fa3Lang Hames mopItr != mopEnd; ++mopItr) { 11093dc7c5138d219048d69952bead22f75efb984fa3Lang Hames const MachineOperand& mop = *mopItr; 11103dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 1111fbc8dd306aa7699a866db278db08d842762b2dc2Lang Hames if (mop.isRegMask()) { 1112fbc8dd306aa7699a866db278db08d842762b2dc2Lang Hames updateRegMaskSlots(oldIdx); 1113fbc8dd306aa7699a866db278db08d842762b2dc2Lang Hames continue; 1114fbc8dd306aa7699a866db278db08d842762b2dc2Lang Hames } 1115fbc8dd306aa7699a866db278db08d842762b2dc2Lang Hames 11163dc7c5138d219048d69952bead22f75efb984fa3Lang Hames if (!mop.isReg() || mop.getReg() == 0) 11173dc7c5138d219048d69952bead22f75efb984fa3Lang Hames continue; 11183dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 11193dc7c5138d219048d69952bead22f75efb984fa3Lang Hames unsigned reg = mop.getReg(); 11203dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 11213dc7c5138d219048d69952bead22f75efb984fa3Lang Hames // TODO: Currently we're skipping uses that are reserved or have no 11223dc7c5138d219048d69952bead22f75efb984fa3Lang Hames // interval, but we're not updating their kills. This should be 11233dc7c5138d219048d69952bead22f75efb984fa3Lang Hames // fixed. 11243dc7c5138d219048d69952bead22f75efb984fa3Lang Hames if (!lis.hasInterval(reg) || 11253dc7c5138d219048d69952bead22f75efb984fa3Lang Hames (TargetRegisterInfo::isPhysicalRegister(reg) && lis.isReserved(reg))) 11263dc7c5138d219048d69952bead22f75efb984fa3Lang Hames continue; 11273dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 11283dc7c5138d219048d69952bead22f75efb984fa3Lang Hames if (mop.readsReg() && !ecs.count(reg)) { 11293dc7c5138d219048d69952bead22f75efb984fa3Lang Hames uses.insert(reg); 11303dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 11313dc7c5138d219048d69952bead22f75efb984fa3Lang Hames if (mop.isDef()) { 11323dc7c5138d219048d69952bead22f75efb984fa3Lang Hames if (mop.isDead()) { 11333dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(!defs.count(reg) && "Can't mix defs with dead-defs."); 11343dc7c5138d219048d69952bead22f75efb984fa3Lang Hames deadDefs.insert(reg); 11353dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } else if (mop.isEarlyClobber()) { 11363dc7c5138d219048d69952bead22f75efb984fa3Lang Hames uses.erase(reg); 11373dc7c5138d219048d69952bead22f75efb984fa3Lang Hames ecs.insert(reg); 11383dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } else { 11393dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(!deadDefs.count(reg) && "Can't mix defs with dead-defs."); 11403dc7c5138d219048d69952bead22f75efb984fa3Lang Hames defs.insert(reg); 11413dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 11423dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 11433dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 11443dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 11453dc7c5138d219048d69952bead22f75efb984fa3Lang Hames if (movingUp) { 11463dc7c5138d219048d69952bead22f75efb984fa3Lang Hames moveUsesUp(oldIdx, uses); 11473dc7c5138d219048d69952bead22f75efb984fa3Lang Hames moveECs(oldIdx, ecs); 11483dc7c5138d219048d69952bead22f75efb984fa3Lang Hames moveDeadDefs(oldIdx, deadDefs); 11493dc7c5138d219048d69952bead22f75efb984fa3Lang Hames moveDefs(oldIdx, defs); 11503dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } else { 11513dc7c5138d219048d69952bead22f75efb984fa3Lang Hames moveDefs(oldIdx, defs); 11523dc7c5138d219048d69952bead22f75efb984fa3Lang Hames moveDeadDefs(oldIdx, deadDefs); 11533dc7c5138d219048d69952bead22f75efb984fa3Lang Hames moveECs(oldIdx, ecs); 11543dc7c5138d219048d69952bead22f75efb984fa3Lang Hames moveUsesDown(oldIdx, uses, mi->getParent()); 11553dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 11563dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 11573dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 11583dc7c5138d219048d69952bead22f75efb984fa3Lang Hamesprivate: 11593dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 11603dc7c5138d219048d69952bead22f75efb984fa3Lang Hames#ifndef NDEBUG 11613dc7c5138d219048d69952bead22f75efb984fa3Lang Hames bool intervalRangesSane(const LiveInterval& li) { 11623dc7c5138d219048d69952bead22f75efb984fa3Lang Hames if (li.empty()) { 11633dc7c5138d219048d69952bead22f75efb984fa3Lang Hames return true; 11643dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 11653dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 11663dc7c5138d219048d69952bead22f75efb984fa3Lang Hames SlotIndex lastEnd = li.begin()->start; 11673dc7c5138d219048d69952bead22f75efb984fa3Lang Hames for (LiveInterval::const_iterator lrItr = li.begin(), lrEnd = li.end(); 11683dc7c5138d219048d69952bead22f75efb984fa3Lang Hames lrItr != lrEnd; ++lrItr) { 11693dc7c5138d219048d69952bead22f75efb984fa3Lang Hames const LiveRange& lr = *lrItr; 11703dc7c5138d219048d69952bead22f75efb984fa3Lang Hames if (lastEnd > lr.start || lr.start >= lr.end) 11713dc7c5138d219048d69952bead22f75efb984fa3Lang Hames return false; 11723dc7c5138d219048d69952bead22f75efb984fa3Lang Hames lastEnd = lr.end; 11733dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 11743dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 11753dc7c5138d219048d69952bead22f75efb984fa3Lang Hames return true; 11763dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 11773dc7c5138d219048d69952bead22f75efb984fa3Lang Hames#endif 11783dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 11793dc7c5138d219048d69952bead22f75efb984fa3Lang Hames void moveKillFlags(unsigned reg, SlotIndex oldIdx, SlotIndex newKillIdx) { 11803dc7c5138d219048d69952bead22f75efb984fa3Lang Hames MachineInstr* oldKillMI = lis.getInstructionFromIndex(oldIdx); 11813dc7c5138d219048d69952bead22f75efb984fa3Lang Hames if (!oldKillMI->killsRegister(reg)) 11823dc7c5138d219048d69952bead22f75efb984fa3Lang Hames return; // Bail out if we don't have kill flags on the old register. 11833dc7c5138d219048d69952bead22f75efb984fa3Lang Hames MachineInstr* newKillMI = lis.getInstructionFromIndex(newKillIdx); 11843dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(oldKillMI->killsRegister(reg) && "Old 'kill' instr isn't a kill."); 11853dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(!newKillMI->killsRegister(reg) && "New kill instr is already a kill."); 11863dc7c5138d219048d69952bead22f75efb984fa3Lang Hames oldKillMI->clearRegisterKills(reg, lis.tri_); 11873dc7c5138d219048d69952bead22f75efb984fa3Lang Hames newKillMI->addRegisterKilled(reg, lis.tri_); 11883dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 11893dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 11903dc7c5138d219048d69952bead22f75efb984fa3Lang Hames template <typename DefSetT> 11913dc7c5138d219048d69952bead22f75efb984fa3Lang Hames void moveDefs(SlotIndex oldIdx, const DefSetT& defs) { 11923dc7c5138d219048d69952bead22f75efb984fa3Lang Hames typedef typename DefSetT::const_iterator DefItr; 11933dc7c5138d219048d69952bead22f75efb984fa3Lang Hames for (DefItr di = defs.begin(), de = defs.end(); di != de; ++di) { 11943dc7c5138d219048d69952bead22f75efb984fa3Lang Hames unsigned def = *di; 11953dc7c5138d219048d69952bead22f75efb984fa3Lang Hames LiveInterval& li = lis.getInterval(def); 11963dc7c5138d219048d69952bead22f75efb984fa3Lang Hames LiveRange* lr = li.getLiveRangeContaining(oldIdx.getRegSlot()); 11973dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(lr != 0 && "No range?"); 11983dc7c5138d219048d69952bead22f75efb984fa3Lang Hames moveDef(*lr, li); 11993dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 12003dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 12013dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 12023dc7c5138d219048d69952bead22f75efb984fa3Lang Hames template <typename DeadDefSetT> 12033dc7c5138d219048d69952bead22f75efb984fa3Lang Hames void moveDeadDefs(SlotIndex oldIdx, const DeadDefSetT& deadDefs) { 12043dc7c5138d219048d69952bead22f75efb984fa3Lang Hames typedef typename DeadDefSetT::const_iterator DeadDefItr; 12053dc7c5138d219048d69952bead22f75efb984fa3Lang Hames for (DeadDefItr di = deadDefs.begin(),de = deadDefs.end(); di != de; ++di) { 12063dc7c5138d219048d69952bead22f75efb984fa3Lang Hames unsigned deadDef = *di; 12073dc7c5138d219048d69952bead22f75efb984fa3Lang Hames LiveInterval& li = lis.getInterval(deadDef); 12083dc7c5138d219048d69952bead22f75efb984fa3Lang Hames LiveRange* lr = li.getLiveRangeContaining(oldIdx.getRegSlot()); 12093dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(lr != 0 && "No range for dead def?"); 12103dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(lr->start == oldIdx.getRegSlot() && "Bad dead range start?"); 12113dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(lr->end == oldIdx.getDeadSlot() && "Bad dead range end?"); 12123dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(lr->valno->def == oldIdx.getRegSlot() && "Bad dead valno def."); 12133dc7c5138d219048d69952bead22f75efb984fa3Lang Hames moveDeadDefOrEC(*lr, li, false); 12143dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 12153dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 12163dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 12173dc7c5138d219048d69952bead22f75efb984fa3Lang Hames template <typename ECSetT> 12183dc7c5138d219048d69952bead22f75efb984fa3Lang Hames void moveECs(SlotIndex oldIdx, const ECSetT& ecs) { 12193dc7c5138d219048d69952bead22f75efb984fa3Lang Hames typedef typename ECSetT::const_iterator ECItr; 12203dc7c5138d219048d69952bead22f75efb984fa3Lang Hames for (ECItr eci = ecs.begin(), ece = ecs.end(); eci != ece; ++eci) { 12213dc7c5138d219048d69952bead22f75efb984fa3Lang Hames unsigned ec = *eci; 12223dc7c5138d219048d69952bead22f75efb984fa3Lang Hames LiveInterval& li = lis.getInterval(ec); 12233dc7c5138d219048d69952bead22f75efb984fa3Lang Hames LiveRange* lr = li.getLiveRangeContaining(oldIdx.getRegSlot(true)); 12243dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(lr != 0 && "No range for early clobber?"); 12253dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(lr->start == oldIdx.getRegSlot(true) && "Bad EC range start?"); 12263dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(lr->end == oldIdx.getRegSlot() && "Bad EC range end."); 12273dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(lr->valno->def == oldIdx.getRegSlot(true) && "Bad EC valno def."); 12283dc7c5138d219048d69952bead22f75efb984fa3Lang Hames moveDeadDefOrEC(*lr, li, true); 12293dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 12303dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 12313dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 12323dc7c5138d219048d69952bead22f75efb984fa3Lang Hames template <typename UseSetT> 12333dc7c5138d219048d69952bead22f75efb984fa3Lang Hames void moveUsesUp(SlotIndex oldIdx, const UseSetT &uses) { 12343dc7c5138d219048d69952bead22f75efb984fa3Lang Hames typedef typename UseSetT::const_iterator UseItr; 12353dc7c5138d219048d69952bead22f75efb984fa3Lang Hames for (UseItr ui = uses.begin(), ue = uses.end(); ui != ue; ++ui) { 12363dc7c5138d219048d69952bead22f75efb984fa3Lang Hames unsigned use = *ui; 12373dc7c5138d219048d69952bead22f75efb984fa3Lang Hames LiveInterval& li = lis.getInterval(use); 12383dc7c5138d219048d69952bead22f75efb984fa3Lang Hames LiveRange* lr = li.getLiveRangeBefore(oldIdx.getRegSlot()); 12393dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(lr != 0 && "No range for use?"); 12403dc7c5138d219048d69952bead22f75efb984fa3Lang Hames moveUseUp(oldIdx, *lr, li); 12413dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 12423dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 12433dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 12443dc7c5138d219048d69952bead22f75efb984fa3Lang Hames template <typename UseSetT> 12453dc7c5138d219048d69952bead22f75efb984fa3Lang Hames void moveUsesDown(SlotIndex oldIdx, const UseSetT &uses, 12463dc7c5138d219048d69952bead22f75efb984fa3Lang Hames const MachineBasicBlock* mbb) { 12473dc7c5138d219048d69952bead22f75efb984fa3Lang Hames typedef typename UseSetT::const_iterator UseItr; 12483dc7c5138d219048d69952bead22f75efb984fa3Lang Hames for (UseItr ui = uses.begin(), ue = uses.end(); ui != ue; ++ui) { 12493dc7c5138d219048d69952bead22f75efb984fa3Lang Hames unsigned use = *ui; 12503dc7c5138d219048d69952bead22f75efb984fa3Lang Hames LiveInterval& li = lis.getInterval(use); 12513dc7c5138d219048d69952bead22f75efb984fa3Lang Hames LiveRange* lr = li.getLiveRangeBefore(oldIdx.getRegSlot()); 12523dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(lr != 0 && "No range for use?"); 12533dc7c5138d219048d69952bead22f75efb984fa3Lang Hames moveUseDown(oldIdx, *lr, li, mbb); 12543dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 12553dc7c5138d219048d69952bead22f75efb984fa3Lang Hames } 1256fbc8dd306aa7699a866db278db08d842762b2dc2Lang Hames 1257fbc8dd306aa7699a866db278db08d842762b2dc2Lang Hames void updateRegMaskSlots(SlotIndex oldIdx) { 1258fbc8dd306aa7699a866db278db08d842762b2dc2Lang Hames SmallVectorImpl<SlotIndex>::iterator rmItr = 1259fbc8dd306aa7699a866db278db08d842762b2dc2Lang Hames std::lower_bound(lis.RegMaskSlots.begin(), lis.RegMaskSlots.end(), 1260fbc8dd306aa7699a866db278db08d842762b2dc2Lang Hames oldIdx); 1261fbc8dd306aa7699a866db278db08d842762b2dc2Lang Hames assert(*rmItr == oldIdx && "No RegMask at oldIdx."); 1262fbc8dd306aa7699a866db278db08d842762b2dc2Lang Hames *rmItr = newIdx; 1263fbc8dd306aa7699a866db278db08d842762b2dc2Lang Hames assert(*prior(rmItr) < *rmItr && *rmItr < *next(rmItr) && 1264fbc8dd306aa7699a866db278db08d842762b2dc2Lang Hames "RegSlots out of order. Did you move one call across another?"); 1265fbc8dd306aa7699a866db278db08d842762b2dc2Lang Hames } 12663dc7c5138d219048d69952bead22f75efb984fa3Lang Hames}; 12673dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 12683dc7c5138d219048d69952bead22f75efb984fa3Lang Hamesvoid LiveIntervals::handleMove(MachineInstr* mi) { 12693dc7c5138d219048d69952bead22f75efb984fa3Lang Hames SlotIndex oldIndex = indexes_->getInstructionIndex(mi); 12703dc7c5138d219048d69952bead22f75efb984fa3Lang Hames indexes_->removeMachineInstrFromMaps(mi); 12713dc7c5138d219048d69952bead22f75efb984fa3Lang Hames SlotIndex newIndex = mi->isInsideBundle() ? 12723dc7c5138d219048d69952bead22f75efb984fa3Lang Hames indexes_->getInstructionIndex(mi->getBundleStart()) : 12733dc7c5138d219048d69952bead22f75efb984fa3Lang Hames indexes_->insertMachineInstrInMaps(mi); 12743dc7c5138d219048d69952bead22f75efb984fa3Lang Hames MachineBasicBlock* mbb = mi->getParent(); 12753dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(getMBBStartIdx(mbb) <= oldIndex && oldIndex < getMBBEndIdx(mbb) && 12763dc7c5138d219048d69952bead22f75efb984fa3Lang Hames "Cannot handle moves across basic block boundaries."); 12773dc7c5138d219048d69952bead22f75efb984fa3Lang Hames assert(!mi->isBundled() && "Can't handle bundled instructions yet."); 12783dc7c5138d219048d69952bead22f75efb984fa3Lang Hames 12793dc7c5138d219048d69952bead22f75efb984fa3Lang Hames HMEditor hme(*this, newIndex); 1280fbc8dd306aa7699a866db278db08d842762b2dc2Lang Hames hme.moveAllOperandsFrom(mi, oldIndex); 12813dc7c5138d219048d69952bead22f75efb984fa3Lang Hames} 1282