LiveIntervalAnalysis.cpp revision ad7ccf34b5de14bd2b9ddc8072d14582a2ce29d9
1a3b8b5c0e0a1d0942288568b2012592184ca67c5Chris Lattner//===-- LiveIntervalAnalysis.cpp - Live Interval Analysis -----------------===// 2ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos// 3ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos// The LLVM Compiler Infrastructure 4ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos// 5ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos// This file was developed by the LLVM research group and is distributed under 6ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos// the University of Illinois Open Source 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 18ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos#define DEBUG_TYPE "liveintervals" 193c3fe462f7978b429ecdd71750c26be25c3d1335Chris Lattner#include "llvm/CodeGen/LiveIntervalAnalysis.h" 2008a6c7614be9793754b17930ba619e875aef9585Misha Brukman#include "VirtRegMap.h" 21015959ee38e4fd4a920f6b0065c50e524762f580Chris Lattner#include "llvm/Value.h" 226b4edbaaf9021e0434f0ce0c3724eb43ed41b770Alkis Evlogimenos#include "llvm/Analysis/LoopInfo.h" 23ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos#include "llvm/CodeGen/LiveVariables.h" 24ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos#include "llvm/CodeGen/MachineFrameInfo.h" 25ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos#include "llvm/CodeGen/MachineInstr.h" 26ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos#include "llvm/CodeGen/Passes.h" 27ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos#include "llvm/CodeGen/SSARegMap.h" 28ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos#include "llvm/Target/MRegisterInfo.h" 29ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos#include "llvm/Target/TargetInstrInfo.h" 30ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos#include "llvm/Target/TargetMachine.h" 31551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#include "llvm/Support/CommandLine.h" 32551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#include "llvm/Support/Debug.h" 33551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#include "llvm/ADT/Statistic.h" 34551ccae044b0ff658fe629dd67edd5ffe75d10e8Reid Spencer#include "llvm/ADT/STLExtras.h" 3520aa474f8fbebde588edc101b90e834df28ce4ceAlkis Evlogimenos#include <algorithm> 3697af751deb9b26fd42fbcee082da9ccc4ded5b45Jeff Cohen#include <cmath> 37ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenosusing namespace llvm; 38ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 39cd3245ac45c595da96bb768a55cddc356dff55feChris LattnerSTATISTIC(numIntervals, "Number of original intervals"); 40cd3245ac45c595da96bb768a55cddc356dff55feChris LattnerSTATISTIC(numIntervalsAfter, "Number of intervals after coalescing"); 41cd3245ac45c595da96bb768a55cddc356dff55feChris LattnerSTATISTIC(numJoins , "Number of interval joins performed"); 42cd3245ac45c595da96bb768a55cddc356dff55feChris LattnerSTATISTIC(numPeep , "Number of identity moves eliminated after coalescing"); 43cd3245ac45c595da96bb768a55cddc356dff55feChris LattnerSTATISTIC(numFolded , "Number of loads/stores folded into instructions"); 44ba1a3df608a14ca37ca944f4c942c202e919ea80Evan ChengSTATISTIC(numAborts , "Number of times interval joining aborted"); 45cd3245ac45c595da96bb768a55cddc356dff55feChris Lattner 46ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenosnamespace { 475d8925c7c506a54ebdfb0bc93437ec9f602eaaa0Chris Lattner RegisterPass<LiveIntervals> X("liveintervals", "Live Interval Analysis"); 48ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 49ed41f1bb1981a98eea63f00c5988cf62bbdd7c59Andrew Lenharth static cl::opt<bool> 501a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos EnableJoining("join-liveintervals", 51428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner cl::desc("Coallesce copies (default=true)"), 521a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos cl::init(true)); 532638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng 542638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng static cl::opt<bool> 552638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng EnableReMat("enable-rematerialization", 562638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng cl::desc("Perform trivial re-materialization"), 572638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng cl::init(false)); 58d74ea2bbd8bb630331f35ead42d385249bd42af8Chris Lattner} 59ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 60f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattnervoid LiveIntervals::getAnalysisUsage(AnalysisUsage &AU) const { 611a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos AU.addRequired<LiveVariables>(); 621a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos AU.addPreservedID(PHIEliminationID); 631a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos AU.addRequiredID(PHIEliminationID); 641a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos AU.addRequiredID(TwoAddressInstructionPassID); 651a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos AU.addRequired<LoopInfo>(); 661a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos MachineFunctionPass::getAnalysisUsage(AU); 67ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos} 68ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 69f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattnervoid LiveIntervals::releaseMemory() { 701a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos mi2iMap_.clear(); 711a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos i2miMap_.clear(); 721a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos r2iMap_.clear(); 731a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos r2rMap_.clear(); 7488d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng JoinedLIs.clear(); 7508cec00588ec1a8fa85b208555f006d7396ae7a4Alkis Evlogimenos} 7608cec00588ec1a8fa85b208555f006d7396ae7a4Alkis Evlogimenos 7708cec00588ec1a8fa85b208555f006d7396ae7a4Alkis Evlogimenos 78993141402f57b4d4cbb7f8a3113f19c61688f9b7Evan Chengstatic bool isZeroLengthInterval(LiveInterval *li) { 79993141402f57b4d4cbb7f8a3113f19c61688f9b7Evan Cheng for (LiveInterval::Ranges::const_iterator 80993141402f57b4d4cbb7f8a3113f19c61688f9b7Evan Cheng i = li->ranges.begin(), e = li->ranges.end(); i != e; ++i) 81993141402f57b4d4cbb7f8a3113f19c61688f9b7Evan Cheng if (i->end - i->start > LiveIntervals::InstrSlots::NUM) 82993141402f57b4d4cbb7f8a3113f19c61688f9b7Evan Cheng return false; 83993141402f57b4d4cbb7f8a3113f19c61688f9b7Evan Cheng return true; 84993141402f57b4d4cbb7f8a3113f19c61688f9b7Evan Cheng} 85993141402f57b4d4cbb7f8a3113f19c61688f9b7Evan Cheng 86993141402f57b4d4cbb7f8a3113f19c61688f9b7Evan Cheng 87ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos/// runOnMachineFunction - Register allocate the whole function 88ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos/// 89ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenosbool LiveIntervals::runOnMachineFunction(MachineFunction &fn) { 901a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos mf_ = &fn; 911a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos tm_ = &fn.getTarget(); 921a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos mri_ = tm_->getRegisterInfo(); 93f768bba43f5c036039851d2fcca8212edca18467Chris Lattner tii_ = tm_->getInstrInfo(); 941a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos lv_ = &getAnalysis<LiveVariables>(); 955327801fb87e3eda52a33f82e6211181030ecb93Alkis Evlogimenos allocatableRegs_ = mri_->getAllocatableSet(fn); 962c4f7b5faaeedd97058ec4cfa44177124c42b9e1Alkis Evlogimenos r2rMap_.grow(mf_->getSSARegMap()->getLastVirtReg()); 971a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 98428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner // Number MachineInstrs and MachineBasicBlocks. 99428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner // Initialize MBB indexes to a sentinal. 100428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner MBB2IdxMap.resize(mf_->getNumBlockIDs(), ~0U); 101428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner 102428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner unsigned MIIndex = 0; 103428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner for (MachineFunction::iterator MBB = mf_->begin(), E = mf_->end(); 104428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner MBB != E; ++MBB) { 105428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner // Set the MBB2IdxMap entry for this MBB. 106428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner MBB2IdxMap[MBB->getNumber()] = MIIndex; 1070c9f92e1ff64ee56724eae444a0442b02f83d0a8Evan Cheng 108428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner for (MachineBasicBlock::iterator I = MBB->begin(), E = MBB->end(); 109428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner I != E; ++I) { 110428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner bool inserted = mi2iMap_.insert(std::make_pair(I, MIIndex)).second; 1111a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos assert(inserted && "multiple MachineInstr -> index mappings"); 112428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner i2miMap_.push_back(I); 113428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner MIIndex += InstrSlots::NUM; 1141a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 115428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner } 116ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 1171a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos computeIntervals(); 118ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 1191a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos numIntervals += getNumIntervals(); 120843b160a2040b3ec4d3452678450afa11704c473Alkis Evlogimenos 121bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "********** INTERVALS **********\n"; 122bdc679d564e67a81792e463f6614b0088f975025Bill Wendling for (iterator I = begin(), E = end(); I != E; ++I) { 123bdc679d564e67a81792e463f6614b0088f975025Bill Wendling I->second.print(DOUT, mri_); 124bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "\n"; 125bdc679d564e67a81792e463f6614b0088f975025Bill Wendling } 1267ac2d3146a196fa0120c579ecd2ddd69652ad230Chris Lattner 127428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner // Join (coallesce) intervals if requested. 1281a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos if (EnableJoining) joinIntervals(); 1291a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 1301a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos numIntervalsAfter += getNumIntervals(); 131428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner 1321a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 1331a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // perform a final pass over the instructions and compute spill 134fbecc5a593da0a5b4d9ff6be63c5558060e31e43Chris Lattner // weights, coalesce virtual registers and remove identity moves. 135428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner const LoopInfo &loopInfo = getAnalysis<LoopInfo>(); 1361a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 1371a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos for (MachineFunction::iterator mbbi = mf_->begin(), mbbe = mf_->end(); 1381a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos mbbi != mbbe; ++mbbi) { 1391a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos MachineBasicBlock* mbb = mbbi; 1401a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos unsigned loopDepth = loopInfo.getLoopDepth(mbb->getBasicBlock()); 1411a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 1421a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos for (MachineBasicBlock::iterator mii = mbb->begin(), mie = mbb->end(); 1431a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos mii != mie; ) { 1441a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // if the move will be an identity move delete it 1451a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos unsigned srcReg, dstReg, RegRep; 146f768bba43f5c036039851d2fcca8212edca18467Chris Lattner if (tii_->isMoveInstr(*mii, srcReg, dstReg) && 1471a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos (RegRep = rep(srcReg)) == rep(dstReg)) { 1481a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // remove from def list 149b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng LiveInterval &RegInt = getOrCreateInterval(RegRep); 150b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng MachineOperand *MO = mii->findRegisterDefOperand(dstReg); 151b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng // If def of this move instruction is dead, remove its live range from 152b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng // the dstination register's live interval. 153b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng if (MO->isDead()) { 154b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng unsigned MoveIdx = getDefIndex(getInstructionIndex(mii)); 155b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng LiveInterval::iterator MLR = RegInt.FindLiveRangeContaining(MoveIdx); 156b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng RegInt.removeRange(MLR->start, MoveIdx+1); 157b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng if (RegInt.empty()) 158b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng removeInterval(RegRep); 159b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng } 160f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner RemoveMachineInstrFromMaps(mii); 1611a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos mii = mbbi->erase(mii); 1621a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos ++numPeep; 1632638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng } else { 164fbecc5a593da0a5b4d9ff6be63c5558060e31e43Chris Lattner for (unsigned i = 0, e = mii->getNumOperands(); i != e; ++i) { 165fbecc5a593da0a5b4d9ff6be63c5558060e31e43Chris Lattner const MachineOperand &mop = mii->getOperand(i); 1661a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos if (mop.isRegister() && mop.getReg() && 1671a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos MRegisterInfo::isVirtualRegister(mop.getReg())) { 1681a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // replace register with representative register 1691a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos unsigned reg = rep(mop.getReg()); 170e53f4a055f74bded20d6129b4724ddd17fd199f6Chris Lattner mii->getOperand(i).setReg(reg); 1711a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 1722638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng // If the definition instruction is re-materializable, its spill 1732638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng // weight is zero. 1741a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos LiveInterval &RegInt = getInterval(reg); 1752638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng if (!RegInt.remat) { 1762638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng RegInt.weight += 1772638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng (mop.isUse() + mop.isDef()) * pow(10.0F, (int)loopDepth); 1782638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng } 1791a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 1801a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 1811a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos ++mii; 1821a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 1831a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 1841a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 1857a40eaaceec0af76d5b97610f3d4e7a47a19d245Alkis Evlogimenos 186993141402f57b4d4cbb7f8a3113f19c61688f9b7Evan Cheng for (iterator I = begin(), E = end(); I != E; ++I) { 187b75a663707e40a6b72bf404e7fbf08f7d9e1eb90Chris Lattner LiveInterval &LI = I->second; 188b75a663707e40a6b72bf404e7fbf08f7d9e1eb90Chris Lattner if (MRegisterInfo::isVirtualRegister(LI.reg)) { 189c9d94d12900bd0d2bd482ef31f8f1deb3ffafa23Chris Lattner // If the live interval length is essentially zero, i.e. in every live 190993141402f57b4d4cbb7f8a3113f19c61688f9b7Evan Cheng // range the use follows def immediately, it doesn't make sense to spill 191993141402f57b4d4cbb7f8a3113f19c61688f9b7Evan Cheng // it and hope it will be easier to allocate for this li. 192b75a663707e40a6b72bf404e7fbf08f7d9e1eb90Chris Lattner if (isZeroLengthInterval(&LI)) 1937902c75331fa8f38fc8380f5573d935c0d149ef5Jim Laskey LI.weight = HUGE_VALF; 194b75a663707e40a6b72bf404e7fbf08f7d9e1eb90Chris Lattner 195393ebae0ef7fa72d133bf901a02fcce3b5554ab7Chris Lattner // Divide the weight of the interval by its size. This encourages 196393ebae0ef7fa72d133bf901a02fcce3b5554ab7Chris Lattner // spilling of intervals that are large and have few uses, and 197393ebae0ef7fa72d133bf901a02fcce3b5554ab7Chris Lattner // discourages spilling of small intervals with many uses. 198393ebae0ef7fa72d133bf901a02fcce3b5554ab7Chris Lattner unsigned Size = 0; 199393ebae0ef7fa72d133bf901a02fcce3b5554ab7Chris Lattner for (LiveInterval::iterator II = LI.begin(), E = LI.end(); II != E;++II) 200393ebae0ef7fa72d133bf901a02fcce3b5554ab7Chris Lattner Size += II->end - II->start; 201b75a663707e40a6b72bf404e7fbf08f7d9e1eb90Chris Lattner 202393ebae0ef7fa72d133bf901a02fcce3b5554ab7Chris Lattner LI.weight /= Size; 203c9d94d12900bd0d2bd482ef31f8f1deb3ffafa23Chris Lattner } 204993141402f57b4d4cbb7f8a3113f19c61688f9b7Evan Cheng } 205993141402f57b4d4cbb7f8a3113f19c61688f9b7Evan Cheng 20670ca358b7d540b6061236ddf757085042873c12cChris Lattner DEBUG(dump()); 2071a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos return true; 208ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos} 209ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 21070ca358b7d540b6061236ddf757085042873c12cChris Lattner/// print - Implement the dump method. 211ce9653ce449f1409815547e1bf60abcd1332d2c9Reid Spencervoid LiveIntervals::print(std::ostream &O, const Module* ) const { 21270ca358b7d540b6061236ddf757085042873c12cChris Lattner O << "********** INTERVALS **********\n"; 2138e7a70976deee78a84099b916591d40f7a1cdc34Chris Lattner for (const_iterator I = begin(), E = end(); I != E; ++I) { 214bdc679d564e67a81792e463f6614b0088f975025Bill Wendling I->second.print(DOUT, mri_); 215bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "\n"; 2168e7a70976deee78a84099b916591d40f7a1cdc34Chris Lattner } 21770ca358b7d540b6061236ddf757085042873c12cChris Lattner 21870ca358b7d540b6061236ddf757085042873c12cChris Lattner O << "********** MACHINEINSTRS **********\n"; 21970ca358b7d540b6061236ddf757085042873c12cChris Lattner for (MachineFunction::iterator mbbi = mf_->begin(), mbbe = mf_->end(); 22070ca358b7d540b6061236ddf757085042873c12cChris Lattner mbbi != mbbe; ++mbbi) { 22170ca358b7d540b6061236ddf757085042873c12cChris Lattner O << ((Value*)mbbi->getBasicBlock())->getName() << ":\n"; 22270ca358b7d540b6061236ddf757085042873c12cChris Lattner for (MachineBasicBlock::iterator mii = mbbi->begin(), 22370ca358b7d540b6061236ddf757085042873c12cChris Lattner mie = mbbi->end(); mii != mie; ++mii) { 224477e4555de341c5de780de3720d6f115ec133c4eChris Lattner O << getInstructionIndex(mii) << '\t' << *mii; 22570ca358b7d540b6061236ddf757085042873c12cChris Lattner } 22670ca358b7d540b6061236ddf757085042873c12cChris Lattner } 22770ca358b7d540b6061236ddf757085042873c12cChris Lattner} 22870ca358b7d540b6061236ddf757085042873c12cChris Lattner 22901352aa1875ee08ae847cce398322042830d92edBill Wendling/// CreateNewLiveInterval - Create a new live interval with the given live 23001352aa1875ee08ae847cce398322042830d92edBill Wendling/// ranges. The new live interval will have an infinite spill weight. 23101352aa1875ee08ae847cce398322042830d92edBill WendlingLiveInterval& 23201352aa1875ee08ae847cce398322042830d92edBill WendlingLiveIntervals::CreateNewLiveInterval(const LiveInterval *LI, 23301352aa1875ee08ae847cce398322042830d92edBill Wendling const std::vector<LiveRange> &LRs) { 23401352aa1875ee08ae847cce398322042830d92edBill Wendling const TargetRegisterClass *RC = mf_->getSSARegMap()->getRegClass(LI->reg); 23501352aa1875ee08ae847cce398322042830d92edBill Wendling 23601352aa1875ee08ae847cce398322042830d92edBill Wendling // Create a new virtual register for the spill interval. 23701352aa1875ee08ae847cce398322042830d92edBill Wendling unsigned NewVReg = mf_->getSSARegMap()->createVirtualRegister(RC); 23801352aa1875ee08ae847cce398322042830d92edBill Wendling 23901352aa1875ee08ae847cce398322042830d92edBill Wendling // Replace the old virtual registers in the machine operands with the shiny 24001352aa1875ee08ae847cce398322042830d92edBill Wendling // new one. 24101352aa1875ee08ae847cce398322042830d92edBill Wendling for (std::vector<LiveRange>::const_iterator 24201352aa1875ee08ae847cce398322042830d92edBill Wendling I = LRs.begin(), E = LRs.end(); I != E; ++I) { 24301352aa1875ee08ae847cce398322042830d92edBill Wendling unsigned Index = getBaseIndex(I->start); 24401352aa1875ee08ae847cce398322042830d92edBill Wendling unsigned End = getBaseIndex(I->end - 1) + InstrSlots::NUM; 24501352aa1875ee08ae847cce398322042830d92edBill Wendling 24601352aa1875ee08ae847cce398322042830d92edBill Wendling for (; Index != End; Index += InstrSlots::NUM) { 24701352aa1875ee08ae847cce398322042830d92edBill Wendling // Skip deleted instructions 24801352aa1875ee08ae847cce398322042830d92edBill Wendling while (Index != End && !getInstructionFromIndex(Index)) 24901352aa1875ee08ae847cce398322042830d92edBill Wendling Index += InstrSlots::NUM; 25001352aa1875ee08ae847cce398322042830d92edBill Wendling 25101352aa1875ee08ae847cce398322042830d92edBill Wendling if (Index == End) break; 25201352aa1875ee08ae847cce398322042830d92edBill Wendling 25301352aa1875ee08ae847cce398322042830d92edBill Wendling MachineInstr *MI = getInstructionFromIndex(Index); 25401352aa1875ee08ae847cce398322042830d92edBill Wendling 255beeb77f3ae9e784f45ede2e38f51b9b25eb65913Bill Wendling for (unsigned J = 0, e = MI->getNumOperands(); J != e; ++J) { 25601352aa1875ee08ae847cce398322042830d92edBill Wendling MachineOperand &MOp = MI->getOperand(J); 25701352aa1875ee08ae847cce398322042830d92edBill Wendling if (MOp.isRegister() && rep(MOp.getReg()) == LI->reg) 25801352aa1875ee08ae847cce398322042830d92edBill Wendling MOp.setReg(NewVReg); 25901352aa1875ee08ae847cce398322042830d92edBill Wendling } 26001352aa1875ee08ae847cce398322042830d92edBill Wendling } 26101352aa1875ee08ae847cce398322042830d92edBill Wendling } 26201352aa1875ee08ae847cce398322042830d92edBill Wendling 26301352aa1875ee08ae847cce398322042830d92edBill Wendling LiveInterval &NewLI = getOrCreateInterval(NewVReg); 26401352aa1875ee08ae847cce398322042830d92edBill Wendling 26501352aa1875ee08ae847cce398322042830d92edBill Wendling // The spill weight is now infinity as it cannot be spilled again 26601352aa1875ee08ae847cce398322042830d92edBill Wendling NewLI.weight = float(HUGE_VAL); 26701352aa1875ee08ae847cce398322042830d92edBill Wendling 26801352aa1875ee08ae847cce398322042830d92edBill Wendling for (std::vector<LiveRange>::const_iterator 26901352aa1875ee08ae847cce398322042830d92edBill Wendling I = LRs.begin(), E = LRs.end(); I != E; ++I) { 270bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << " Adding live range " << *I << " to new interval\n"; 27101352aa1875ee08ae847cce398322042830d92edBill Wendling NewLI.addRange(*I); 27201352aa1875ee08ae847cce398322042830d92edBill Wendling } 27301352aa1875ee08ae847cce398322042830d92edBill Wendling 274bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "Created new live interval " << NewLI << "\n"; 27501352aa1875ee08ae847cce398322042830d92edBill Wendling return NewLI; 27601352aa1875ee08ae847cce398322042830d92edBill Wendling} 27701352aa1875ee08ae847cce398322042830d92edBill Wendling 27870ca358b7d540b6061236ddf757085042873c12cChris Lattnerstd::vector<LiveInterval*> LiveIntervals:: 27970ca358b7d540b6061236ddf757085042873c12cChris LattneraddIntervalsForSpills(const LiveInterval &li, VirtRegMap &vrm, int slot) { 280d8d26b3268acf7f157028f0cb60a545b185e8905Alkis Evlogimenos // since this is called after the analysis is done we don't know if 281d8d26b3268acf7f157028f0cb60a545b185e8905Alkis Evlogimenos // LiveVariables is available 282d8d26b3268acf7f157028f0cb60a545b185e8905Alkis Evlogimenos lv_ = getAnalysisToUpdate<LiveVariables>(); 283d8d26b3268acf7f157028f0cb60a545b185e8905Alkis Evlogimenos 2841a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos std::vector<LiveInterval*> added; 2851a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 2867902c75331fa8f38fc8380f5573d935c0d149ef5Jim Laskey assert(li.weight != HUGE_VALF && 2871a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos "attempt to spill already spilled interval!"); 2881a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 289bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "\t\t\t\tadding intervals for spills for interval: "; 290bdc679d564e67a81792e463f6614b0088f975025Bill Wendling li.print(DOUT, mri_); 291bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << '\n'; 2921a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 2931a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos const TargetRegisterClass* rc = mf_->getSSARegMap()->getRegClass(li.reg); 2941a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 2951a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos for (LiveInterval::Ranges::const_iterator 2961a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos i = li.ranges.begin(), e = li.ranges.end(); i != e; ++i) { 2971a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos unsigned index = getBaseIndex(i->start); 2981a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos unsigned end = getBaseIndex(i->end-1) + InstrSlots::NUM; 2991a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos for (; index != end; index += InstrSlots::NUM) { 3001a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // skip deleted instructions 3011a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos while (index != end && !getInstructionFromIndex(index)) 3021a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos index += InstrSlots::NUM; 3031a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos if (index == end) break; 3041a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 3053b9db830f7f0ed33af13459be3fd60ebe01a13caChris Lattner MachineInstr *MI = getInstructionFromIndex(index); 3061a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 3072926869b4a083fc951484de03a9867eabf81e880Chris Lattner RestartInstruction: 3083b9db830f7f0ed33af13459be3fd60ebe01a13caChris Lattner for (unsigned i = 0; i != MI->getNumOperands(); ++i) { 3093b9db830f7f0ed33af13459be3fd60ebe01a13caChris Lattner MachineOperand& mop = MI->getOperand(i); 3101a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos if (mop.isRegister() && mop.getReg() == li.reg) { 3112638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng MachineInstr *fmi = li.remat ? NULL 3122638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng : mri_->foldMemoryOperand(MI, i, slot); 3132638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng if (fmi) { 314b11443dc8458b0ba72d484dacf99dffa2e8d3b51Chris Lattner // Attempt to fold the memory reference into the instruction. If we 315b11443dc8458b0ba72d484dacf99dffa2e8d3b51Chris Lattner // can do this, we don't need to insert spill code. 316d8d26b3268acf7f157028f0cb60a545b185e8905Alkis Evlogimenos if (lv_) 3173b9db830f7f0ed33af13459be3fd60ebe01a13caChris Lattner lv_->instructionChanged(MI, fmi); 318200370fb5617a1719f0054804b412469ce486ebdEvan Cheng MachineBasicBlock &MBB = *MI->getParent(); 31935f2705e3de4600c3621b883eed9b22e4607ddf4Chris Lattner vrm.virtFolded(li.reg, MI, i, fmi); 3203b9db830f7f0ed33af13459be3fd60ebe01a13caChris Lattner mi2iMap_.erase(MI); 3211a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos i2miMap_[index/InstrSlots::NUM] = fmi; 3221a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos mi2iMap_[fmi] = index; 3233b9db830f7f0ed33af13459be3fd60ebe01a13caChris Lattner MI = MBB.insert(MBB.erase(MI), fmi); 3241a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos ++numFolded; 325477e4555de341c5de780de3720d6f115ec133c4eChris Lattner // Folding the load/store can completely change the instruction in 326477e4555de341c5de780de3720d6f115ec133c4eChris Lattner // unpredictable ways, rescan it from the beginning. 3272926869b4a083fc951484de03a9867eabf81e880Chris Lattner goto RestartInstruction; 328477e4555de341c5de780de3720d6f115ec133c4eChris Lattner } else { 3292926869b4a083fc951484de03a9867eabf81e880Chris Lattner // Create a new virtual register for the spill interval. 3302926869b4a083fc951484de03a9867eabf81e880Chris Lattner unsigned NewVReg = mf_->getSSARegMap()->createVirtualRegister(rc); 3312926869b4a083fc951484de03a9867eabf81e880Chris Lattner 3322926869b4a083fc951484de03a9867eabf81e880Chris Lattner // Scan all of the operands of this instruction rewriting operands 3332926869b4a083fc951484de03a9867eabf81e880Chris Lattner // to use NewVReg instead of li.reg as appropriate. We do this for 3342926869b4a083fc951484de03a9867eabf81e880Chris Lattner // two reasons: 3351a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // 3362926869b4a083fc951484de03a9867eabf81e880Chris Lattner // 1. If the instr reads the same spilled vreg multiple times, we 3372926869b4a083fc951484de03a9867eabf81e880Chris Lattner // want to reuse the NewVReg. 3382926869b4a083fc951484de03a9867eabf81e880Chris Lattner // 2. If the instr is a two-addr instruction, we are required to 3392926869b4a083fc951484de03a9867eabf81e880Chris Lattner // keep the src/dst regs pinned. 3402926869b4a083fc951484de03a9867eabf81e880Chris Lattner // 3412926869b4a083fc951484de03a9867eabf81e880Chris Lattner // Keep track of whether we replace a use and/or def so that we can 3422926869b4a083fc951484de03a9867eabf81e880Chris Lattner // create the spill interval with the appropriate range. 3432926869b4a083fc951484de03a9867eabf81e880Chris Lattner mop.setReg(NewVReg); 3442926869b4a083fc951484de03a9867eabf81e880Chris Lattner 3452926869b4a083fc951484de03a9867eabf81e880Chris Lattner bool HasUse = mop.isUse(); 3462926869b4a083fc951484de03a9867eabf81e880Chris Lattner bool HasDef = mop.isDef(); 3472926869b4a083fc951484de03a9867eabf81e880Chris Lattner for (unsigned j = i+1, e = MI->getNumOperands(); j != e; ++j) { 3482926869b4a083fc951484de03a9867eabf81e880Chris Lattner if (MI->getOperand(j).isReg() && 3492926869b4a083fc951484de03a9867eabf81e880Chris Lattner MI->getOperand(j).getReg() == li.reg) { 3502926869b4a083fc951484de03a9867eabf81e880Chris Lattner MI->getOperand(j).setReg(NewVReg); 3512926869b4a083fc951484de03a9867eabf81e880Chris Lattner HasUse |= MI->getOperand(j).isUse(); 3522926869b4a083fc951484de03a9867eabf81e880Chris Lattner HasDef |= MI->getOperand(j).isDef(); 3532926869b4a083fc951484de03a9867eabf81e880Chris Lattner } 3542926869b4a083fc951484de03a9867eabf81e880Chris Lattner } 3551a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 3561a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // create a new register for this spill 3571a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos vrm.grow(); 3582638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng if (li.remat) 3592638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng vrm.setVirtIsReMaterialized(NewVReg, li.remat); 3602926869b4a083fc951484de03a9867eabf81e880Chris Lattner vrm.assignVirt2StackSlot(NewVReg, slot); 3612926869b4a083fc951484de03a9867eabf81e880Chris Lattner LiveInterval &nI = getOrCreateInterval(NewVReg); 3622638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng nI.remat = li.remat; 3631a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos assert(nI.empty()); 36470ca358b7d540b6061236ddf757085042873c12cChris Lattner 3651a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // the spill weight is now infinity as it 3661a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // cannot be spilled again 3677902c75331fa8f38fc8380f5573d935c0d149ef5Jim Laskey nI.weight = HUGE_VALF; 3682926869b4a083fc951484de03a9867eabf81e880Chris Lattner 3692926869b4a083fc951484de03a9867eabf81e880Chris Lattner if (HasUse) { 3702926869b4a083fc951484de03a9867eabf81e880Chris Lattner LiveRange LR(getLoadIndex(index), getUseIndex(index), 3712926869b4a083fc951484de03a9867eabf81e880Chris Lattner nI.getNextValue(~0U, 0)); 372bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << " +" << LR; 3732926869b4a083fc951484de03a9867eabf81e880Chris Lattner nI.addRange(LR); 3742926869b4a083fc951484de03a9867eabf81e880Chris Lattner } 3752926869b4a083fc951484de03a9867eabf81e880Chris Lattner if (HasDef) { 3762926869b4a083fc951484de03a9867eabf81e880Chris Lattner LiveRange LR(getDefIndex(index), getStoreIndex(index), 3772926869b4a083fc951484de03a9867eabf81e880Chris Lattner nI.getNextValue(~0U, 0)); 378bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << " +" << LR; 3792926869b4a083fc951484de03a9867eabf81e880Chris Lattner nI.addRange(LR); 3802926869b4a083fc951484de03a9867eabf81e880Chris Lattner } 3812926869b4a083fc951484de03a9867eabf81e880Chris Lattner 3821a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos added.push_back(&nI); 38370ca358b7d540b6061236ddf757085042873c12cChris Lattner 384d8d26b3268acf7f157028f0cb60a545b185e8905Alkis Evlogimenos // update live variables if it is available 385d8d26b3268acf7f157028f0cb60a545b185e8905Alkis Evlogimenos if (lv_) 3862926869b4a083fc951484de03a9867eabf81e880Chris Lattner lv_->addVirtualRegisterKilled(NewVReg, MI); 387b11443dc8458b0ba72d484dacf99dffa2e8d3b51Chris Lattner 388bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "\t\t\t\tadded new interval: "; 389bdc679d564e67a81792e463f6614b0088f975025Bill Wendling nI.print(DOUT, mri_); 390bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << '\n'; 3911a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 392843b160a2040b3ec4d3452678450afa11704c473Alkis Evlogimenos } 3931a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 394843b160a2040b3ec4d3452678450afa11704c473Alkis Evlogimenos } 3951a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 39626f5a69e52b64e035d26c135979a39b39fd6ba3eAlkis Evlogimenos 3971a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos return added; 398843b160a2040b3ec4d3452678450afa11704c473Alkis Evlogimenos} 399843b160a2040b3ec4d3452678450afa11704c473Alkis Evlogimenos 400be4f88a8b8bb3311e0dc4cde8533763d7923c3eaChris Lattnervoid LiveIntervals::printRegName(unsigned reg) const { 4011a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos if (MRegisterInfo::isPhysicalRegister(reg)) 402e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << mri_->getName(reg); 4031a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos else 404e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "%reg" << reg; 405ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos} 406ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 407bf105c842450d3308d024be203ddd533f37051ecEvan Cheng/// isReDefinedByTwoAddr - Returns true if the Reg re-definition is due to 408bf105c842450d3308d024be203ddd533f37051ecEvan Cheng/// two addr elimination. 409bf105c842450d3308d024be203ddd533f37051ecEvan Chengstatic bool isReDefinedByTwoAddr(MachineInstr *MI, unsigned Reg, 410bf105c842450d3308d024be203ddd533f37051ecEvan Cheng const TargetInstrInfo *TII) { 411bf105c842450d3308d024be203ddd533f37051ecEvan Cheng for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { 412bf105c842450d3308d024be203ddd533f37051ecEvan Cheng MachineOperand &MO1 = MI->getOperand(i); 413bf105c842450d3308d024be203ddd533f37051ecEvan Cheng if (MO1.isRegister() && MO1.isDef() && MO1.getReg() == Reg) { 414bf105c842450d3308d024be203ddd533f37051ecEvan Cheng for (unsigned j = i+1; j < e; ++j) { 415bf105c842450d3308d024be203ddd533f37051ecEvan Cheng MachineOperand &MO2 = MI->getOperand(j); 416bf105c842450d3308d024be203ddd533f37051ecEvan Cheng if (MO2.isRegister() && MO2.isUse() && MO2.getReg() == Reg && 41751cdcd197268a7abf19b2698fc824e0da3d98049Evan Cheng MI->getInstrDescriptor()-> 41851cdcd197268a7abf19b2698fc824e0da3d98049Evan Cheng getOperandConstraint(j, TOI::TIED_TO) == (int)i) 419bf105c842450d3308d024be203ddd533f37051ecEvan Cheng return true; 420bf105c842450d3308d024be203ddd533f37051ecEvan Cheng } 421bf105c842450d3308d024be203ddd533f37051ecEvan Cheng } 422bf105c842450d3308d024be203ddd533f37051ecEvan Cheng } 423bf105c842450d3308d024be203ddd533f37051ecEvan Cheng return false; 424bf105c842450d3308d024be203ddd533f37051ecEvan Cheng} 425bf105c842450d3308d024be203ddd533f37051ecEvan Cheng 426be4f88a8b8bb3311e0dc4cde8533763d7923c3eaChris Lattnervoid LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb, 427ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos MachineBasicBlock::iterator mi, 4286b128bdc58a496e9f08e4d09416330320761baffChris Lattner unsigned MIIdx, 429be4f88a8b8bb3311e0dc4cde8533763d7923c3eaChris Lattner LiveInterval &interval) { 430bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "\t\tregister: "; DEBUG(printRegName(interval.reg)); 4311a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos LiveVariables::VarInfo& vi = lv_->getVarInfo(interval.reg); 4321a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 433706515727c6d024015fffded2b3109a4f0ac5299Alkis Evlogimenos // Virtual registers may be defined multiple times (due to phi 434706515727c6d024015fffded2b3109a4f0ac5299Alkis Evlogimenos // elimination and 2-addr elimination). Much of what we do only has to be 435706515727c6d024015fffded2b3109a4f0ac5299Alkis Evlogimenos // done once for the vreg. We use an empty interval to detect the first 4361a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // time we see a vreg. 4371a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos if (interval.empty()) { 4382638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng // Remember if the definition can be rematerialized. 4392638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng if (EnableReMat && 4402638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng vi.DefInst && tii_->isReMaterializable(vi.DefInst->getOpcode())) 4412638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng interval.remat = vi.DefInst; 4422638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng 4431a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // Get the Idx of the defining instructions. 4446b128bdc58a496e9f08e4d09416330320761baffChris Lattner unsigned defIndex = getDefIndex(MIIdx); 4451a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 44691725b75852443923b419fd23215194cfc65dd88Chris Lattner unsigned ValNum; 44791725b75852443923b419fd23215194cfc65dd88Chris Lattner unsigned SrcReg, DstReg; 44891725b75852443923b419fd23215194cfc65dd88Chris Lattner if (!tii_->isMoveInstr(*mi, SrcReg, DstReg)) 44991725b75852443923b419fd23215194cfc65dd88Chris Lattner ValNum = interval.getNextValue(~0U, 0); 45091725b75852443923b419fd23215194cfc65dd88Chris Lattner else 45191725b75852443923b419fd23215194cfc65dd88Chris Lattner ValNum = interval.getNextValue(defIndex, SrcReg); 45291725b75852443923b419fd23215194cfc65dd88Chris Lattner 4531a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos assert(ValNum == 0 && "First value in interval is not 0?"); 4541a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos ValNum = 0; // Clue in the optimizer. 4551a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 4561a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // Loop over all of the blocks that the vreg is defined in. There are 4571a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // two cases we have to handle here. The most common case is a vreg 4581a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // whose lifetime is contained within a basic block. In this case there 4591a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // will be a single kill, in MBB, which comes after the definition. 4601a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos if (vi.Kills.size() == 1 && vi.Kills[0]->getParent() == mbb) { 4611a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // FIXME: what about dead vars? 4621a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos unsigned killIdx; 4631a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos if (vi.Kills[0] != mi) 4641a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos killIdx = getUseIndex(getInstructionIndex(vi.Kills[0]))+1; 4651a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos else 4661a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos killIdx = defIndex+1; 4671a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 4681a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // If the kill happens after the definition, we have an intra-block 4691a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // live range. 4701a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos if (killIdx > defIndex) { 47161de82d8853a02fe39c47302432abb70a586704fEvan Cheng assert(vi.AliveBlocks.none() && 4721a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos "Shouldn't be alive across any blocks!"); 4731a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos LiveRange LR(defIndex, killIdx, ValNum); 4741a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos interval.addRange(LR); 475bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << " +" << LR << "\n"; 4761a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos return; 4771a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 4781a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 4796097d13b2a624048dbe02e39e2dfb23bfa269b64Chris Lattner 4801a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // The other case we handle is when a virtual register lives to the end 4811a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // of the defining block, potentially live across some blocks, then is 4821a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // live into some number of blocks, but gets killed. Start by adding a 4831a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // range that goes from this definition to the end of the defining block. 484d19e2901c1b79d287d01079659684f3a4951a69eAlkis Evlogimenos LiveRange NewLR(defIndex, 485d19e2901c1b79d287d01079659684f3a4951a69eAlkis Evlogimenos getInstructionIndex(&mbb->back()) + InstrSlots::NUM, 486d19e2901c1b79d287d01079659684f3a4951a69eAlkis Evlogimenos ValNum); 487bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << " +" << NewLR; 4881a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos interval.addRange(NewLR); 4891a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 4901a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // Iterate over all of the blocks that the variable is completely 4911a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // live in, adding [insrtIndex(begin), instrIndex(end)+4) to the 4921a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // live interval. 4931a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos for (unsigned i = 0, e = vi.AliveBlocks.size(); i != e; ++i) { 4941a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos if (vi.AliveBlocks[i]) { 495428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner MachineBasicBlock *MBB = mf_->getBlockNumbered(i); 496428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner if (!MBB->empty()) { 497428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner LiveRange LR(getMBBStartIdx(i), 498428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner getInstructionIndex(&MBB->back()) + InstrSlots::NUM, 4991a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos ValNum); 5001a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos interval.addRange(LR); 501bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << " +" << LR; 5021a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 5031a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 5041a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 5051a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 5061a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // Finally, this virtual register is live from the start of any killing 5071a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // block to the 'use' slot of the killing instruction. 5081a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos for (unsigned i = 0, e = vi.Kills.size(); i != e; ++i) { 5091a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos MachineInstr *Kill = vi.Kills[i]; 510428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner LiveRange LR(getMBBStartIdx(Kill->getParent()), 511d19e2901c1b79d287d01079659684f3a4951a69eAlkis Evlogimenos getUseIndex(getInstructionIndex(Kill))+1, 512d19e2901c1b79d287d01079659684f3a4951a69eAlkis Evlogimenos ValNum); 5131a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos interval.addRange(LR); 514bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << " +" << LR; 5151a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 5161a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 5171a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } else { 5182638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng // Can't safely assume definition is rematierializable anymore. 5192638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng interval.remat = NULL; 5202638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng 5211a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // If this is the second time we see a virtual register definition, it 5221a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // must be due to phi elimination or two addr elimination. If this is 523bf105c842450d3308d024be203ddd533f37051ecEvan Cheng // the result of two address elimination, then the vreg is one of the 524bf105c842450d3308d024be203ddd533f37051ecEvan Cheng // def-and-use register operand. 525bf105c842450d3308d024be203ddd533f37051ecEvan Cheng if (isReDefinedByTwoAddr(mi, interval.reg, tii_)) { 5261a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // If this is a two-address definition, then we have already processed 5271a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // the live range. The only problem is that we didn't realize there 5281a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // are actually two values in the live interval. Because of this we 5291a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // need to take the LiveRegion that defines this register and split it 5301a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // into two values. 5311a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos unsigned DefIndex = getDefIndex(getInstructionIndex(vi.DefInst)); 5326b128bdc58a496e9f08e4d09416330320761baffChris Lattner unsigned RedefIndex = getDefIndex(MIIdx); 5331a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 5341a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // Delete the initial value, which should be short and continuous, 535be4f88a8b8bb3311e0dc4cde8533763d7923c3eaChris Lattner // because the 2-addr copy must be in the same MBB as the redef. 5361a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos interval.removeRange(DefIndex, RedefIndex); 537706515727c6d024015fffded2b3109a4f0ac5299Alkis Evlogimenos 538be4f88a8b8bb3311e0dc4cde8533763d7923c3eaChris Lattner // Two-address vregs should always only be redefined once. This means 539be4f88a8b8bb3311e0dc4cde8533763d7923c3eaChris Lattner // that at this point, there should be exactly one value number in it. 540be4f88a8b8bb3311e0dc4cde8533763d7923c3eaChris Lattner assert(interval.containsOneValue() && "Unexpected 2-addr liveint!"); 541be4f88a8b8bb3311e0dc4cde8533763d7923c3eaChris Lattner 54291725b75852443923b419fd23215194cfc65dd88Chris Lattner // The new value number (#1) is defined by the instruction we claimed 54391725b75852443923b419fd23215194cfc65dd88Chris Lattner // defined value #0. 54491725b75852443923b419fd23215194cfc65dd88Chris Lattner unsigned ValNo = interval.getNextValue(0, 0); 54591725b75852443923b419fd23215194cfc65dd88Chris Lattner interval.setValueNumberInfo(1, interval.getValNumInfo(0)); 546be4f88a8b8bb3311e0dc4cde8533763d7923c3eaChris Lattner 54791725b75852443923b419fd23215194cfc65dd88Chris Lattner // Value#0 is now defined by the 2-addr instruction. 54891725b75852443923b419fd23215194cfc65dd88Chris Lattner interval.setValueNumberInfo(0, std::make_pair(~0U, 0U)); 549be4f88a8b8bb3311e0dc4cde8533763d7923c3eaChris Lattner 550be4f88a8b8bb3311e0dc4cde8533763d7923c3eaChris Lattner // Add the new live interval which replaces the range for the input copy. 551be4f88a8b8bb3311e0dc4cde8533763d7923c3eaChris Lattner LiveRange LR(DefIndex, RedefIndex, ValNo); 552bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << " replace range with " << LR; 5531a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos interval.addRange(LR); 5541a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 5551a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // If this redefinition is dead, we need to add a dummy unit live 5561a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // range covering the def slot. 557ab4b66d4c279e8cd9e448687020fc838e7881dbcChris Lattner if (lv_->RegisterDefIsDead(mi, interval.reg)) 558ab4b66d4c279e8cd9e448687020fc838e7881dbcChris Lattner interval.addRange(LiveRange(RedefIndex, RedefIndex+1, 0)); 5591a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 56056fdd7af884a35673fb6dd3e01333960922c3ac2Evan Cheng DOUT << " RESULT: "; 561bdc679d564e67a81792e463f6614b0088f975025Bill Wendling interval.print(DOUT, mri_); 5621a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 5631a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } else { 5641a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // Otherwise, this must be because of phi elimination. If this is the 5651a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // first redefinition of the vreg that we have seen, go back and change 5661a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // the live range in the PHI block to be a different value number. 5671a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos if (interval.containsOneValue()) { 5681a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos assert(vi.Kills.size() == 1 && 5691a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos "PHI elimination vreg should have one kill, the PHI itself!"); 5701a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 5711a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // Remove the old range that we now know has an incorrect number. 5721a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos MachineInstr *Killer = vi.Kills[0]; 573428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner unsigned Start = getMBBStartIdx(Killer->getParent()); 5741a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos unsigned End = getUseIndex(getInstructionIndex(Killer))+1; 57556fdd7af884a35673fb6dd3e01333960922c3ac2Evan Cheng DOUT << " Removing [" << Start << "," << End << "] from: "; 576bdc679d564e67a81792e463f6614b0088f975025Bill Wendling interval.print(DOUT, mri_); DOUT << "\n"; 5771a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos interval.removeRange(Start, End); 57856fdd7af884a35673fb6dd3e01333960922c3ac2Evan Cheng DOUT << " RESULT: "; interval.print(DOUT, mri_); 5791a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 580be4f88a8b8bb3311e0dc4cde8533763d7923c3eaChris Lattner // Replace the interval with one of a NEW value number. Note that this 581be4f88a8b8bb3311e0dc4cde8533763d7923c3eaChris Lattner // value number isn't actually defined by an instruction, weird huh? :) 58291725b75852443923b419fd23215194cfc65dd88Chris Lattner LiveRange LR(Start, End, interval.getNextValue(~0U, 0)); 583bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << " replace range with " << LR; 5841a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos interval.addRange(LR); 58556fdd7af884a35673fb6dd3e01333960922c3ac2Evan Cheng DOUT << " RESULT: "; interval.print(DOUT, mri_); 5861a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 5871a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 5881a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // In the case of PHI elimination, each variable definition is only 5891a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // live until the end of the block. We've already taken care of the 5901a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // rest of the live range. 5916b128bdc58a496e9f08e4d09416330320761baffChris Lattner unsigned defIndex = getDefIndex(MIIdx); 59291725b75852443923b419fd23215194cfc65dd88Chris Lattner 59391725b75852443923b419fd23215194cfc65dd88Chris Lattner unsigned ValNum; 59491725b75852443923b419fd23215194cfc65dd88Chris Lattner unsigned SrcReg, DstReg; 59591725b75852443923b419fd23215194cfc65dd88Chris Lattner if (!tii_->isMoveInstr(*mi, SrcReg, DstReg)) 59691725b75852443923b419fd23215194cfc65dd88Chris Lattner ValNum = interval.getNextValue(~0U, 0); 59791725b75852443923b419fd23215194cfc65dd88Chris Lattner else 59891725b75852443923b419fd23215194cfc65dd88Chris Lattner ValNum = interval.getNextValue(defIndex, SrcReg); 59991725b75852443923b419fd23215194cfc65dd88Chris Lattner 600706515727c6d024015fffded2b3109a4f0ac5299Alkis Evlogimenos LiveRange LR(defIndex, 60191725b75852443923b419fd23215194cfc65dd88Chris Lattner getInstructionIndex(&mbb->back()) + InstrSlots::NUM, ValNum); 6021a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos interval.addRange(LR); 603bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << " +" << LR; 604dd2cc65f34f9b7bfda1cd0c42becedfc361d46f8Alkis Evlogimenos } 6051a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 606ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 607bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << '\n'; 608ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos} 609ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 610f35fef7060c465dd7b578bf6339a18e8a8911888Chris Lattnervoid LiveIntervals::handlePhysicalRegisterDef(MachineBasicBlock *MBB, 611ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos MachineBasicBlock::iterator mi, 6126b128bdc58a496e9f08e4d09416330320761baffChris Lattner unsigned MIIdx, 61391725b75852443923b419fd23215194cfc65dd88Chris Lattner LiveInterval &interval, 61491725b75852443923b419fd23215194cfc65dd88Chris Lattner unsigned SrcReg) { 6151a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // A physical register cannot be live across basic block, so its 6161a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // lifetime must end somewhere in its defining basic block. 617bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "\t\tregister: "; DEBUG(printRegName(interval.reg)); 6181a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 6196b128bdc58a496e9f08e4d09416330320761baffChris Lattner unsigned baseIndex = MIIdx; 6201a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos unsigned start = getDefIndex(baseIndex); 6211a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos unsigned end = start; 6221a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 6231a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // If it is not used after definition, it is considered dead at 6241a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // the instruction defining it. Hence its interval is: 6251a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // [defSlot(def), defSlot(def)+1) 626ab4b66d4c279e8cd9e448687020fc838e7881dbcChris Lattner if (lv_->RegisterDefIsDead(mi, interval.reg)) { 627bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << " dead"; 628ab4b66d4c279e8cd9e448687020fc838e7881dbcChris Lattner end = getDefIndex(start) + 1; 629ab4b66d4c279e8cd9e448687020fc838e7881dbcChris Lattner goto exit; 6301a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 631ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 6321a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // If it is not dead on definition, it must be killed by a 6331a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // subsequent instruction. Hence its interval is: 6341a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // [defSlot(def), useSlot(kill)+1) 6355ab6f5fe666d0e3403d9b777324d1a1999118153Chris Lattner while (++mi != MBB->end()) { 6361a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos baseIndex += InstrSlots::NUM; 637ab4b66d4c279e8cd9e448687020fc838e7881dbcChris Lattner if (lv_->KillsRegister(mi, interval.reg)) { 638bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << " killed"; 639ab4b66d4c279e8cd9e448687020fc838e7881dbcChris Lattner end = getUseIndex(baseIndex) + 1; 640ab4b66d4c279e8cd9e448687020fc838e7881dbcChris Lattner goto exit; 6419a1956ae6ad2d4892afbc9f1b97d645d220b6d4aEvan Cheng } else if (lv_->ModifiesRegister(mi, interval.reg)) { 6429a1956ae6ad2d4892afbc9f1b97d645d220b6d4aEvan Cheng // Another instruction redefines the register before it is ever read. 6439a1956ae6ad2d4892afbc9f1b97d645d220b6d4aEvan Cheng // Then the register is essentially dead at the instruction that defines 6449a1956ae6ad2d4892afbc9f1b97d645d220b6d4aEvan Cheng // it. Hence its interval is: 6459a1956ae6ad2d4892afbc9f1b97d645d220b6d4aEvan Cheng // [defSlot(def), defSlot(def)+1) 646bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << " dead"; 6479a1956ae6ad2d4892afbc9f1b97d645d220b6d4aEvan Cheng end = getDefIndex(start) + 1; 6489a1956ae6ad2d4892afbc9f1b97d645d220b6d4aEvan Cheng goto exit; 649f35fef7060c465dd7b578bf6339a18e8a8911888Chris Lattner } 6501a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 6515ab6f5fe666d0e3403d9b777324d1a1999118153Chris Lattner 6525ab6f5fe666d0e3403d9b777324d1a1999118153Chris Lattner // The only case we should have a dead physreg here without a killing or 6535ab6f5fe666d0e3403d9b777324d1a1999118153Chris Lattner // instruction where we know it's dead is if it is live-in to the function 6545ab6f5fe666d0e3403d9b777324d1a1999118153Chris Lattner // and never used. 65591725b75852443923b419fd23215194cfc65dd88Chris Lattner assert(!SrcReg && "physreg was not killed in defining block!"); 6565ab6f5fe666d0e3403d9b777324d1a1999118153Chris Lattner end = getDefIndex(start) + 1; // It's dead. 65702ba13c9897ae2b19f9201e57460d7ee2b753a0bAlkis Evlogimenos 658ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenosexit: 6591a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos assert(start < end && "did not find end of interval?"); 660f768bba43f5c036039851d2fcca8212edca18467Chris Lattner 66191725b75852443923b419fd23215194cfc65dd88Chris Lattner LiveRange LR(start, end, interval.getNextValue(SrcReg != 0 ? start : ~0U, 66291725b75852443923b419fd23215194cfc65dd88Chris Lattner SrcReg)); 6631a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos interval.addRange(LR); 664bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << " +" << LR << '\n'; 665ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos} 666ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos 667f35fef7060c465dd7b578bf6339a18e8a8911888Chris Lattnervoid LiveIntervals::handleRegisterDef(MachineBasicBlock *MBB, 668f35fef7060c465dd7b578bf6339a18e8a8911888Chris Lattner MachineBasicBlock::iterator MI, 6696b128bdc58a496e9f08e4d09416330320761baffChris Lattner unsigned MIIdx, 670f35fef7060c465dd7b578bf6339a18e8a8911888Chris Lattner unsigned reg) { 671f35fef7060c465dd7b578bf6339a18e8a8911888Chris Lattner if (MRegisterInfo::isVirtualRegister(reg)) 6726b128bdc58a496e9f08e4d09416330320761baffChris Lattner handleVirtualRegisterDef(MBB, MI, MIIdx, getOrCreateInterval(reg)); 6735327801fb87e3eda52a33f82e6211181030ecb93Alkis Evlogimenos else if (allocatableRegs_[reg]) { 67491725b75852443923b419fd23215194cfc65dd88Chris Lattner unsigned SrcReg, DstReg; 67591725b75852443923b419fd23215194cfc65dd88Chris Lattner if (!tii_->isMoveInstr(*MI, SrcReg, DstReg)) 67691725b75852443923b419fd23215194cfc65dd88Chris Lattner SrcReg = 0; 6776b128bdc58a496e9f08e4d09416330320761baffChris Lattner handlePhysicalRegisterDef(MBB, MI, MIIdx, getOrCreateInterval(reg), SrcReg); 678f35fef7060c465dd7b578bf6339a18e8a8911888Chris Lattner for (const unsigned* AS = mri_->getAliasSet(reg); *AS; ++AS) 6796b128bdc58a496e9f08e4d09416330320761baffChris Lattner handlePhysicalRegisterDef(MBB, MI, MIIdx, getOrCreateInterval(*AS), 0); 680f35fef7060c465dd7b578bf6339a18e8a8911888Chris Lattner } 6814d46e1e521c0df1990ea50f8146d22bd77ea71a6Alkis Evlogimenos} 6824d46e1e521c0df1990ea50f8146d22bd77ea71a6Alkis Evlogimenos 683b371f457b0ea4a652a9f526ba4375c80ae542252Evan Chengvoid LiveIntervals::handleLiveInRegister(MachineBasicBlock *MBB, 6849b25b8ca24d6df2e097741dcc15016772ee4eda7Jim Laskey unsigned MIIdx, 685b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng LiveInterval &interval) { 686b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng DOUT << "\t\tlivein register: "; DEBUG(printRegName(interval.reg)); 687b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng 688b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng // Look for kills, if it reaches a def before it's killed, then it shouldn't 689b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng // be considered a livein. 690b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng MachineBasicBlock::iterator mi = MBB->begin(); 6919b25b8ca24d6df2e097741dcc15016772ee4eda7Jim Laskey unsigned baseIndex = MIIdx; 6929b25b8ca24d6df2e097741dcc15016772ee4eda7Jim Laskey unsigned start = baseIndex; 693b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng unsigned end = start; 694b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng while (mi != MBB->end()) { 695b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng if (lv_->KillsRegister(mi, interval.reg)) { 696b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng DOUT << " killed"; 697b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng end = getUseIndex(baseIndex) + 1; 698b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng goto exit; 699b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng } else if (lv_->ModifiesRegister(mi, interval.reg)) { 700b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng // Another instruction redefines the register before it is ever read. 701b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng // Then the register is essentially dead at the instruction that defines 702b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng // it. Hence its interval is: 703b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng // [defSlot(def), defSlot(def)+1) 704b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng DOUT << " dead"; 705b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng end = getDefIndex(start) + 1; 706b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng goto exit; 707b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng } 708b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng 709b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng baseIndex += InstrSlots::NUM; 710b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng ++mi; 711b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng } 712b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng 713b371f457b0ea4a652a9f526ba4375c80ae542252Evan Chengexit: 714b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng assert(start < end && "did not find end of interval?"); 715b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng 716b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng LiveRange LR(start, end, interval.getNextValue(~0U, 0)); 717b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng DOUT << " +" << LR << '\n'; 7189b25b8ca24d6df2e097741dcc15016772ee4eda7Jim Laskey interval.addRange(LR); 719b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng} 720b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng 721ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos/// computeIntervals - computes the live intervals for virtual 7224d46e1e521c0df1990ea50f8146d22bd77ea71a6Alkis Evlogimenos/// registers. for some ordering of the machine instructions [1,N] a 72308cec00588ec1a8fa85b208555f006d7396ae7a4Alkis Evlogimenos/// live interval is an interval [i, j) where 1 <= i <= j < N for 724ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos/// which a variable is live 725f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattnervoid LiveIntervals::computeIntervals() { 726bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "********** COMPUTING LIVE INTERVALS **********\n" 727bdc679d564e67a81792e463f6614b0088f975025Bill Wendling << "********** Function: " 728bdc679d564e67a81792e463f6614b0088f975025Bill Wendling << ((Value*)mf_->getFunction())->getName() << '\n'; 7296b128bdc58a496e9f08e4d09416330320761baffChris Lattner // Track the index of the current machine instr. 7306b128bdc58a496e9f08e4d09416330320761baffChris Lattner unsigned MIIndex = 0; 731428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner for (MachineFunction::iterator MBBI = mf_->begin(), E = mf_->end(); 732428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner MBBI != E; ++MBBI) { 733428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner MachineBasicBlock *MBB = MBBI; 734bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << ((Value*)MBB->getBasicBlock())->getName() << ":\n"; 7351a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 736428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner MachineBasicBlock::iterator MI = MBB->begin(), miEnd = MBB->end(); 7370c9f92e1ff64ee56724eae444a0442b02f83d0a8Evan Cheng 7380c9f92e1ff64ee56724eae444a0442b02f83d0a8Evan Cheng if (MBB->livein_begin() != MBB->livein_end()) { 739b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng // Create intervals for live-ins to this BB first. 740b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng for (MachineBasicBlock::const_livein_iterator LI = MBB->livein_begin(), 7410c9f92e1ff64ee56724eae444a0442b02f83d0a8Evan Cheng LE = MBB->livein_end(); LI != LE; ++LI) { 7429b25b8ca24d6df2e097741dcc15016772ee4eda7Jim Laskey handleLiveInRegister(MBB, MIIndex, getOrCreateInterval(*LI)); 7430c9f92e1ff64ee56724eae444a0442b02f83d0a8Evan Cheng for (const unsigned* AS = mri_->getAliasSet(*LI); *AS; ++AS) 7449b25b8ca24d6df2e097741dcc15016772ee4eda7Jim Laskey handleLiveInRegister(MBB, MIIndex, getOrCreateInterval(*AS)); 7450c9f92e1ff64ee56724eae444a0442b02f83d0a8Evan Cheng } 746dffb2e83ed2546226d09c40aa43524e2392322daChris Lattner } 747dffb2e83ed2546226d09c40aa43524e2392322daChris Lattner 748428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner for (; MI != miEnd; ++MI) { 749bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << MIIndex << "\t" << *MI; 7501a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos 751438f7bc67cf235ccee7e6f7ac7f4ae2186eb8020Evan Cheng // Handle defs. 752428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner for (int i = MI->getNumOperands() - 1; i >= 0; --i) { 753428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner MachineOperand &MO = MI->getOperand(i); 7541a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos // handle register defs - build intervals 755428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner if (MO.isRegister() && MO.getReg() && MO.isDef()) 756428b92eb83b457b71d29d1d4b7900d36a0ce9a53Chris Lattner handleRegisterDef(MBB, MI, MIIndex, MO.getReg()); 7571a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 7586b128bdc58a496e9f08e4d09416330320761baffChris Lattner 7596b128bdc58a496e9f08e4d09416330320761baffChris Lattner MIIndex += InstrSlots::NUM; 760ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos } 7611a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos } 762ff0cbe175df40e0d2b36e59c6fb72f211f1cba4cAlkis Evlogimenos} 763b27ef248f579b354aab434f63c417ab1103e47e2Alkis Evlogimenos 764f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// AdjustCopiesBackFrom - We found a non-trivially-coallescable copy with IntA 765f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// being the source and IntB being the dest, thus this defines a value number 766f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// in IntB. If the source value number (in IntA) is defined by a copy from B, 767f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// see if we can merge these two pieces of B into a single value number, 768f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// eliminating a copy. For example: 769f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// 770f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// A3 = B0 771f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// ... 772f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// B1 = A3 <- this copy 773f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// 774f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// In this case, B0 can be extended to where the B1 copy lives, allowing the B1 775f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// value number to be replaced with B0 (which simplifies the B liveinterval). 776f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// 777f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// This returns true if an interval was modified. 778f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// 779f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattnerbool LiveIntervals::AdjustCopiesBackFrom(LiveInterval &IntA, LiveInterval &IntB, 7806d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner MachineInstr *CopyMI) { 7816d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner unsigned CopyIdx = getDefIndex(getInstructionIndex(CopyMI)); 7826d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner 783f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // BValNo is a value number in B that is defined by a copy from A. 'B3' in 784f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // the example above. 785f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner LiveInterval::iterator BLR = IntB.FindLiveRangeContaining(CopyIdx); 786f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner unsigned BValNo = BLR->ValId; 787f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 788f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // Get the location that B is defined at. Two options: either this value has 789f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // an unknown definition point or it is defined at CopyIdx. If unknown, we 790f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // can't process it. 791f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner unsigned BValNoDefIdx = IntB.getInstForValNum(BValNo); 792f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner if (BValNoDefIdx == ~0U) return false; 793f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner assert(BValNoDefIdx == CopyIdx && 794f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner "Copy doesn't define the value?"); 795f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 796f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // AValNo is the value number in A that defines the copy, A0 in the example. 797f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner LiveInterval::iterator AValLR = IntA.FindLiveRangeContaining(CopyIdx-1); 798f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner unsigned AValNo = AValLR->ValId; 799aa51a484e188ecb8d3e4b6ac852c553a4aacc89aChris Lattner 800f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // If AValNo is defined as a copy from IntB, we can potentially process this. 801aa51a484e188ecb8d3e4b6ac852c553a4aacc89aChris Lattner 802f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // Get the instruction that defines this value number. 80391725b75852443923b419fd23215194cfc65dd88Chris Lattner unsigned SrcReg = IntA.getSrcRegForValNum(AValNo); 80491725b75852443923b419fd23215194cfc65dd88Chris Lattner if (!SrcReg) return false; // Not defined by a copy. 805aa51a484e188ecb8d3e4b6ac852c553a4aacc89aChris Lattner 806f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // If the value number is not defined by a copy instruction, ignore it. 807aa51a484e188ecb8d3e4b6ac852c553a4aacc89aChris Lattner 808f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // If the source register comes from an interval other than IntB, we can't 809f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // handle this. 810f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner if (rep(SrcReg) != IntB.reg) return false; 81191725b75852443923b419fd23215194cfc65dd88Chris Lattner 812f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // Get the LiveRange in IntB that this value number starts with. 81391725b75852443923b419fd23215194cfc65dd88Chris Lattner unsigned AValNoInstIdx = IntA.getInstForValNum(AValNo); 814f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner LiveInterval::iterator ValLR = IntB.FindLiveRangeContaining(AValNoInstIdx-1); 815aa51a484e188ecb8d3e4b6ac852c553a4aacc89aChris Lattner 816f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // Make sure that the end of the live range is inside the same block as 817f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // CopyMI. 818f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner MachineInstr *ValLREndInst = getInstructionFromIndex(ValLR->end-1); 819c114b2cad7293d98686d380273085f5c32966b52Chris Lattner if (!ValLREndInst || 820c114b2cad7293d98686d380273085f5c32966b52Chris Lattner ValLREndInst->getParent() != CopyMI->getParent()) return false; 821f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 822f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // Okay, we now know that ValLR ends in the same block that the CopyMI 823f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // live-range starts. If there are no intervening live ranges between them in 824f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // IntB, we can merge them. 825f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner if (ValLR+1 != BLR) return false; 826aa51a484e188ecb8d3e4b6ac852c553a4aacc89aChris Lattner 827bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "\nExtending: "; IntB.print(DOUT, mri_); 828ba256037ced5606d5cea8a1676b21eaf91d924deChris Lattner 829ba256037ced5606d5cea8a1676b21eaf91d924deChris Lattner // We are about to delete CopyMI, so need to remove it as the 'instruction 830ba256037ced5606d5cea8a1676b21eaf91d924deChris Lattner // that defines this value #'. 83191725b75852443923b419fd23215194cfc65dd88Chris Lattner IntB.setValueNumberInfo(BValNo, std::make_pair(~0U, 0)); 832ba256037ced5606d5cea8a1676b21eaf91d924deChris Lattner 833f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // Okay, we can merge them. We need to insert a new liverange: 834f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // [ValLR.end, BLR.begin) of either value number, then we merge the 835f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // two value numbers. 836c114b2cad7293d98686d380273085f5c32966b52Chris Lattner unsigned FillerStart = ValLR->end, FillerEnd = BLR->start; 837c114b2cad7293d98686d380273085f5c32966b52Chris Lattner IntB.addRange(LiveRange(FillerStart, FillerEnd, BValNo)); 838c114b2cad7293d98686d380273085f5c32966b52Chris Lattner 839c114b2cad7293d98686d380273085f5c32966b52Chris Lattner // If the IntB live range is assigned to a physical register, and if that 840c114b2cad7293d98686d380273085f5c32966b52Chris Lattner // physreg has aliases, 841c114b2cad7293d98686d380273085f5c32966b52Chris Lattner if (MRegisterInfo::isPhysicalRegister(IntB.reg)) { 842c114b2cad7293d98686d380273085f5c32966b52Chris Lattner for (const unsigned *AS = mri_->getAliasSet(IntB.reg); *AS; ++AS) { 843c114b2cad7293d98686d380273085f5c32966b52Chris Lattner LiveInterval &AliasLI = getInterval(*AS); 844c114b2cad7293d98686d380273085f5c32966b52Chris Lattner AliasLI.addRange(LiveRange(FillerStart, FillerEnd, 84591725b75852443923b419fd23215194cfc65dd88Chris Lattner AliasLI.getNextValue(~0U, 0))); 846c114b2cad7293d98686d380273085f5c32966b52Chris Lattner } 847c114b2cad7293d98686d380273085f5c32966b52Chris Lattner } 848f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 849f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // Okay, merge "B1" into the same value number as "B0". 850f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner if (BValNo != ValLR->ValId) 851f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner IntB.MergeValueNumberInto(BValNo, ValLR->ValId); 852bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << " result = "; IntB.print(DOUT, mri_); 853bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "\n"; 85416191f03337645dc1638b7489d71d685e6c07cddEvan Cheng 85516191f03337645dc1638b7489d71d685e6c07cddEvan Cheng // If the source instruction was killing the source register before the 85616191f03337645dc1638b7489d71d685e6c07cddEvan Cheng // merge, unset the isKill marker given the live range has been extended. 857ad7ccf34b5de14bd2b9ddc8072d14582a2ce29d9Evan Cheng int UIdx = ValLREndInst->findRegisterUseOperand(IntB.reg, true); 858ad7ccf34b5de14bd2b9ddc8072d14582a2ce29d9Evan Cheng if (UIdx != -1) 859ad7ccf34b5de14bd2b9ddc8072d14582a2ce29d9Evan Cheng ValLREndInst->getOperand(UIdx).unsetIsKill(); 860f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 861f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // Finally, delete the copy instruction. 862f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner RemoveMachineInstrFromMaps(CopyMI); 863f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner CopyMI->eraseFromParent(); 864f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner ++numPeep; 865aa51a484e188ecb8d3e4b6ac852c553a4aacc89aChris Lattner return true; 866aa51a484e188ecb8d3e4b6ac852c553a4aacc89aChris Lattner} 867aa51a484e188ecb8d3e4b6ac852c553a4aacc89aChris Lattner 868f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// JoinCopy - Attempt to join intervals corresponding to SrcReg/DstReg, 869f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// which are the src/dst of the copy instruction CopyMI. This returns true 870f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// if the copy was successfully coallesced away, or if it is never possible 871f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// to coallesce these this copy, due to register constraints. It returns 872f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// false if it is not currently possible to coallesce this interval, but 873f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner/// it may be possible if other things get coallesced. 874f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattnerbool LiveIntervals::JoinCopy(MachineInstr *CopyMI, 875f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner unsigned SrcReg, unsigned DstReg) { 876bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << getInstructionIndex(CopyMI) << '\t' << *CopyMI; 877b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng 878f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // Get representative registers. 879b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng unsigned repSrcReg = rep(SrcReg); 880b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng unsigned repDstReg = rep(DstReg); 881f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 882f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // If they are already joined we continue. 883b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng if (repSrcReg == repDstReg) { 884bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "\tCopy already coallesced.\n"; 885f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner return true; // Not coallescable. 886f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner } 887f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 888f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // If they are both physical registers, we cannot join them. 889b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng if (MRegisterInfo::isPhysicalRegister(repSrcReg) && 890b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng MRegisterInfo::isPhysicalRegister(repDstReg)) { 891bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "\tCan not coallesce physregs.\n"; 892f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner return true; // Not coallescable. 8937ac2d3146a196fa0120c579ecd2ddd69652ad230Chris Lattner } 894f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 895f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // We only join virtual registers with allocatable physical registers. 896b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng if (MRegisterInfo::isPhysicalRegister(repSrcReg) && 897b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng !allocatableRegs_[repSrcReg]) { 898bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "\tSrc reg is unallocatable physreg.\n"; 899f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner return true; // Not coallescable. 900f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner } 901b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng if (MRegisterInfo::isPhysicalRegister(repDstReg) && 902b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng !allocatableRegs_[repDstReg]) { 903bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "\tDst reg is unallocatable physreg.\n"; 904f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner return true; // Not coallescable. 905f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner } 906f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 907f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // If they are not of the same register class, we cannot join them. 908b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng if (differingRegisterClasses(repSrcReg, repDstReg)) { 909bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "\tSrc/Dest are different register classes.\n"; 910f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner return true; // Not coallescable. 911f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner } 912f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 913b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng LiveInterval &SrcInt = getInterval(repSrcReg); 914b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng LiveInterval &DestInt = getInterval(repDstReg); 915b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng assert(SrcInt.reg == repSrcReg && DestInt.reg == repDstReg && 916f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner "Register mapping is horribly broken!"); 917f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 918bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "\t\tInspecting "; SrcInt.print(DOUT, mri_); 919bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << " and "; DestInt.print(DOUT, mri_); 920bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << ": "; 921b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng 922b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng // Check if it is necessary to propagate "isDead" property before intervals 923b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng // are joined. 924b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng MachineOperand *mopd = CopyMI->findRegisterDefOperand(DstReg); 925b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng bool isDead = mopd->isDead(); 926edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng bool isShorten = false; 9272c3535d2a6738d154914a59f272fac45e50b706bEvan Cheng unsigned SrcStart = 0, RemoveStart = 0; 9282c3535d2a6738d154914a59f272fac45e50b706bEvan Cheng unsigned SrcEnd = 0, RemoveEnd = 0; 929b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng if (isDead) { 93048ef398ebd2f2b992c81bebd5159de119ce62c80Evan Cheng unsigned CopyIdx = getInstructionIndex(CopyMI); 93148ef398ebd2f2b992c81bebd5159de119ce62c80Evan Cheng LiveInterval::iterator SrcLR = 93248ef398ebd2f2b992c81bebd5159de119ce62c80Evan Cheng SrcInt.FindLiveRangeContaining(getUseIndex(CopyIdx)); 9332c3535d2a6738d154914a59f272fac45e50b706bEvan Cheng RemoveStart = SrcStart = SrcLR->start; 9342c3535d2a6738d154914a59f272fac45e50b706bEvan Cheng RemoveEnd = SrcEnd = SrcLR->end; 93548ef398ebd2f2b992c81bebd5159de119ce62c80Evan Cheng // The instruction which defines the src is only truly dead if there are 93648ef398ebd2f2b992c81bebd5159de119ce62c80Evan Cheng // no intermediate uses and there isn't a use beyond the copy. 93748ef398ebd2f2b992c81bebd5159de119ce62c80Evan Cheng // FIXME: find the last use, mark is kill and shorten the live range. 938edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng if (SrcEnd > getDefIndex(CopyIdx)) 939b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng isDead = false; 940edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng else { 941edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng MachineOperand *MOU; 9422c3535d2a6738d154914a59f272fac45e50b706bEvan Cheng MachineInstr *LastUse= lastRegisterUse(repSrcReg, SrcStart, CopyIdx, MOU); 943edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng if (LastUse) { 944edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng // Shorten the liveinterval to the end of last use. 945edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng MOU->setIsKill(); 946edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng isDead = false; 947edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng isShorten = true; 9482c3535d2a6738d154914a59f272fac45e50b706bEvan Cheng RemoveStart = getDefIndex(getInstructionIndex(LastUse)); 9492c3535d2a6738d154914a59f272fac45e50b706bEvan Cheng RemoveEnd = SrcEnd; 950edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng } 951edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng } 952b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng } 953b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng 954ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng // We need to be careful about coalescing a source physical register with a 955ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng // virtual register. Once the coalescing is done, it cannot be broken and 956ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng // these are not spillable! If the destination interval uses are far away, 957ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng // think twice about coalescing them! 958757072d954937514585b5c213f01f851d31826a1Evan Cheng if (!mopd->isDead() && MRegisterInfo::isPhysicalRegister(repSrcReg)) { 959ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng // Small function. No need to worry! 960cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng unsigned Threshold = allocatableRegs_.count() * 2; 961cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng if (r2iMap_.size() <= Threshold) 962ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng goto TryJoin; 963ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng 964ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng LiveVariables::VarInfo& dvi = lv_->getVarInfo(repDstReg); 965ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng // Is the value used in the current BB or any immediate successroe BB? 966cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng MachineBasicBlock *CopyBB = CopyMI->getParent(); 967cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng if (dvi.UsedBlocks[CopyBB->getNumber()]) 968cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng goto TryJoin; 969cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng for (MachineBasicBlock::succ_iterator SI = CopyBB->succ_begin(), 970cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng SE = CopyBB->succ_end(); SI != SE; ++SI) { 971cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng MachineBasicBlock *SuccMBB = *SI; 972cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng if (dvi.UsedBlocks[SuccMBB->getNumber()]) 973ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng goto TryJoin; 974ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng } 975ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng 976ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng // Ok, no use in this BB and no use in immediate successor BB's. Be really 977ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng // careful now! 978ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng // It's only used in one BB, forget about it! 979cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng if (dvi.UsedBlocks.count() < 2) { 980ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng ++numAborts; 981ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng return false; 982ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng } 983ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng 984cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng // Determine whether to allow coalescing based on how far the closest 985cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng // use is. 986cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng unsigned CopyIdx = getInstructionIndex(CopyMI); 987cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng unsigned MinDist = i2miMap_.size() * InstrSlots::NUM; 988ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng int UseBBNum = dvi.UsedBlocks.find_first(); 989ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng while (UseBBNum != -1) { 990ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng MachineBasicBlock *UseBB = mf_->getBlockNumbered(UseBBNum); 991cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng unsigned UseIdx = getMBBStartIdx(UseBB); 992cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng if (UseIdx > CopyIdx) { 993cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng MinDist = std::min(MinDist, UseIdx - CopyIdx); 994cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng if (MinDist <= Threshold) 995cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng break; 996cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng } 997ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng UseBBNum = dvi.UsedBlocks.find_next(UseBBNum); 998ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng } 999cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng if (MinDist > Threshold) { 1000cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng // Don't do it! 1001cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng ++numAborts; 1002cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng return false; 1003cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng } 1004ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng } 1005ba1a3df608a14ca37ca944f4c942c202e919ea80Evan Cheng 1006ba1a3df608a14ca37ca944f4c942c202e919ea80Evan ChengTryJoin: 10076d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner // Okay, attempt to join these two intervals. On failure, this returns false. 10086d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner // Otherwise, if one of the intervals being joined is a physreg, this method 10096d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner // always canonicalizes DestInt to be it. The output "SrcInt" will not have 10106d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner // been modified, so we can use this information below to update aliases. 1011b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng if (JoinIntervals(DestInt, SrcInt)) { 1012b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng if (isDead) { 1013b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng // Result of the copy is dead. Propagate this property. 1014a16d4429e49b5406c0af905953b5eae13b9cf47cEvan Cheng if (SrcStart == 0) { 1015a16d4429e49b5406c0af905953b5eae13b9cf47cEvan Cheng assert(MRegisterInfo::isPhysicalRegister(repSrcReg) && 1016a16d4429e49b5406c0af905953b5eae13b9cf47cEvan Cheng "Live-in must be a physical register!"); 1017a16d4429e49b5406c0af905953b5eae13b9cf47cEvan Cheng // Live-in to the function but dead. Remove it from entry live-in set. 1018b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng // JoinIntervals may end up swapping the two intervals. 1019a16d4429e49b5406c0af905953b5eae13b9cf47cEvan Cheng mf_->begin()->removeLiveIn(repSrcReg); 1020b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng } else { 1021b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng MachineInstr *SrcMI = getInstructionFromIndex(SrcStart); 1022b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng if (SrcMI) { 1023b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng MachineOperand *mops = SrcMI->findRegisterDefOperand(SrcReg); 1024b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng if (mops) 1025b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng // FIXME: mops == NULL means SrcMI defines a subregister? 1026b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng mops->setIsDead(); 1027b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng } 1028b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng } 1029b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng } 1030edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng 10312c3535d2a6738d154914a59f272fac45e50b706bEvan Cheng if (isShorten || isDead) { 1032edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng // Shorten the live interval. 1033edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng LiveInterval &LiveInInt = (repSrcReg == DestInt.reg) ? DestInt : SrcInt; 10342c3535d2a6738d154914a59f272fac45e50b706bEvan Cheng LiveInInt.removeRange(RemoveStart, RemoveEnd); 1035edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng } 1036b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng } else { 10376d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner // Coallescing failed. 10386d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner 10396d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner // If we can eliminate the copy without merging the live ranges, do so now. 10406d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner if (AdjustCopiesBackFrom(SrcInt, DestInt, CopyMI)) 10416d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner return true; 1042f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 10436d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner // Otherwise, we are unable to join the intervals. 1044bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "Interference!\n"; 1045f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner return false; 1046f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner } 1047f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 1048b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng bool Swapped = repSrcReg == DestInt.reg; 1049e7f729b42b54fa751ba3524e1c597aad6d3ec3d7Chris Lattner if (Swapped) 1050b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng std::swap(repSrcReg, repDstReg); 1051b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng assert(MRegisterInfo::isVirtualRegister(repSrcReg) && 1052e7f729b42b54fa751ba3524e1c597aad6d3ec3d7Chris Lattner "LiveInterval::join didn't work right!"); 1053e7f729b42b54fa751ba3524e1c597aad6d3ec3d7Chris Lattner 1054c114b2cad7293d98686d380273085f5c32966b52Chris Lattner // If we're about to merge live ranges into a physical register live range, 1055c114b2cad7293d98686d380273085f5c32966b52Chris Lattner // we have to update any aliased register's live ranges to indicate that they 1056c114b2cad7293d98686d380273085f5c32966b52Chris Lattner // have clobbered values for this range. 1057b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng if (MRegisterInfo::isPhysicalRegister(repDstReg)) { 1058b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng for (const unsigned *AS = mri_->getAliasSet(repDstReg); *AS; ++AS) 1059e7f729b42b54fa751ba3524e1c597aad6d3ec3d7Chris Lattner getInterval(*AS).MergeInClobberRanges(SrcInt); 1060cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng } else { 1061cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng // Merge UsedBlocks info if the destination is a virtual register. 1062cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng LiveVariables::VarInfo& dVI = lv_->getVarInfo(repDstReg); 1063cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng LiveVariables::VarInfo& sVI = lv_->getVarInfo(repSrcReg); 1064cf596c54d4089ef23ce00be04bbb674d3ae2e0a6Evan Cheng dVI.UsedBlocks |= sVI.UsedBlocks; 1065c114b2cad7293d98686d380273085f5c32966b52Chris Lattner } 1066c114b2cad7293d98686d380273085f5c32966b52Chris Lattner 1067bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "\n\t\tJoined. Result = "; DestInt.print(DOUT, mri_); 1068bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "\n"; 106930cac02a925c9d56613711b0e77099cb7252bc9bEvan Cheng 107088d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng // Remember these liveintervals have been joined. 107188d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng JoinedLIs.set(repSrcReg - MRegisterInfo::FirstVirtualRegister); 107288d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng if (MRegisterInfo::isVirtualRegister(repDstReg)) 107388d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng JoinedLIs.set(repDstReg - MRegisterInfo::FirstVirtualRegister); 107430cac02a925c9d56613711b0e77099cb7252bc9bEvan Cheng 1075da2295e631ae07788f7db53efa3bea6367e7656cEvan Cheng // If the intervals were swapped by Join, swap them back so that the register 1076da2295e631ae07788f7db53efa3bea6367e7656cEvan Cheng // mapping (in the r2i map) is correct. 1077da2295e631ae07788f7db53efa3bea6367e7656cEvan Cheng if (Swapped) SrcInt.swap(DestInt); 1078b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng removeInterval(repSrcReg); 1079b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng r2rMap_[repSrcReg] = repDstReg; 1080e7f729b42b54fa751ba3524e1c597aad6d3ec3d7Chris Lattner 1081bfe180af9eef1cf767f61f501ca325fcce2ae7ceChris Lattner // Finally, delete the copy instruction. 1082bfe180af9eef1cf767f61f501ca325fcce2ae7ceChris Lattner RemoveMachineInstrFromMaps(CopyMI); 1083bfe180af9eef1cf767f61f501ca325fcce2ae7ceChris Lattner CopyMI->eraseFromParent(); 1084bfe180af9eef1cf767f61f501ca325fcce2ae7ceChris Lattner ++numPeep; 1085f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner ++numJoins; 1086f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner return true; 1087dd2cc65f34f9b7bfda1cd0c42becedfc361d46f8Alkis Evlogimenos} 1088dd2cc65f34f9b7bfda1cd0c42becedfc361d46f8Alkis Evlogimenos 10896d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner/// ComputeUltimateVN - Assuming we are going to join two live intervals, 10906d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner/// compute what the resultant value numbers for each value in the input two 10916d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner/// ranges will be. This is complicated by copies between the two which can 10926d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner/// and will commonly cause multiple value numbers to be merged into one. 10936d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner/// 10946d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner/// VN is the value number that we're trying to resolve. InstDefiningValue 10956d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner/// keeps track of the new InstDefiningValue assignment for the result 10966d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner/// LiveInterval. ThisFromOther/OtherFromThis are sets that keep track of 10976d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner/// whether a value in this or other is a copy from the opposite set. 10986d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner/// ThisValNoAssignments/OtherValNoAssignments keep track of value #'s that have 10996d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner/// already been assigned. 11006d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner/// 11016d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner/// ThisFromOther[x] - If x is defined as a copy from the other interval, this 11026d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner/// contains the value number the copy is from. 11036d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner/// 11046d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattnerstatic unsigned ComputeUltimateVN(unsigned VN, 110591725b75852443923b419fd23215194cfc65dd88Chris Lattner SmallVector<std::pair<unsigned, 110691725b75852443923b419fd23215194cfc65dd88Chris Lattner unsigned>, 16> &ValueNumberInfo, 11076d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner SmallVector<int, 16> &ThisFromOther, 11086d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner SmallVector<int, 16> &OtherFromThis, 11096d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner SmallVector<int, 16> &ThisValNoAssignments, 11106d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner SmallVector<int, 16> &OtherValNoAssignments, 11116d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner LiveInterval &ThisLI, LiveInterval &OtherLI) { 11126d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner // If the VN has already been computed, just return it. 11136d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner if (ThisValNoAssignments[VN] >= 0) 11146d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner return ThisValNoAssignments[VN]; 11158a67f6e848244b00dd706a7e01079d1b39c07731Chris Lattner// assert(ThisValNoAssignments[VN] != -2 && "Cyclic case?"); 11166d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner 11176d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner // If this val is not a copy from the other val, then it must be a new value 11186d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner // number in the destination. 11196d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner int OtherValNo = ThisFromOther[VN]; 11206d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner if (OtherValNo == -1) { 112191725b75852443923b419fd23215194cfc65dd88Chris Lattner ValueNumberInfo.push_back(ThisLI.getValNumInfo(VN)); 112291725b75852443923b419fd23215194cfc65dd88Chris Lattner return ThisValNoAssignments[VN] = ValueNumberInfo.size()-1; 11236d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner } 11246d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner 11258a67f6e848244b00dd706a7e01079d1b39c07731Chris Lattner // Otherwise, this *is* a copy from the RHS. If the other side has already 11268a67f6e848244b00dd706a7e01079d1b39c07731Chris Lattner // been computed, return it. 11278a67f6e848244b00dd706a7e01079d1b39c07731Chris Lattner if (OtherValNoAssignments[OtherValNo] >= 0) 11288a67f6e848244b00dd706a7e01079d1b39c07731Chris Lattner return ThisValNoAssignments[VN] = OtherValNoAssignments[OtherValNo]; 11298a67f6e848244b00dd706a7e01079d1b39c07731Chris Lattner 11308a67f6e848244b00dd706a7e01079d1b39c07731Chris Lattner // Mark this value number as currently being computed, then ask what the 11318a67f6e848244b00dd706a7e01079d1b39c07731Chris Lattner // ultimate value # of the other value is. 11326d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner ThisValNoAssignments[VN] = -2; 11336d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner unsigned UltimateVN = 113491725b75852443923b419fd23215194cfc65dd88Chris Lattner ComputeUltimateVN(OtherValNo, ValueNumberInfo, 11356d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner OtherFromThis, ThisFromOther, 11366d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner OtherValNoAssignments, ThisValNoAssignments, 11376d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner OtherLI, ThisLI); 11386d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner return ThisValNoAssignments[VN] = UltimateVN; 11396d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner} 11406d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner 1141f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattnerstatic bool InVector(unsigned Val, const SmallVector<unsigned, 8> &V) { 1142f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner return std::find(V.begin(), V.end(), Val) != V.end(); 1143f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner} 1144f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner 1145f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner/// SimpleJoin - Attempt to joint the specified interval into this one. The 1146f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner/// caller of this method must guarantee that the RHS only contains a single 1147f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner/// value number and that the RHS is not defined by a copy from this 1148f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner/// interval. This returns false if the intervals are not joinable, or it 1149f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner/// joins them and returns true. 1150f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattnerbool LiveIntervals::SimpleJoin(LiveInterval &LHS, LiveInterval &RHS) { 1151f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner assert(RHS.containsOneValue()); 1152f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner 1153f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // Some number (potentially more than one) value numbers in the current 1154f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // interval may be defined as copies from the RHS. Scan the overlapping 1155f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // portions of the LHS and RHS, keeping track of this and looking for 1156f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // overlapping live ranges that are NOT defined as copies. If these exist, we 1157f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // cannot coallesce. 1158f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner 1159f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner LiveInterval::iterator LHSIt = LHS.begin(), LHSEnd = LHS.end(); 1160f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner LiveInterval::iterator RHSIt = RHS.begin(), RHSEnd = RHS.end(); 1161f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner 1162f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner if (LHSIt->start < RHSIt->start) { 1163f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner LHSIt = std::upper_bound(LHSIt, LHSEnd, RHSIt->start); 1164f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner if (LHSIt != LHS.begin()) --LHSIt; 1165f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner } else if (RHSIt->start < LHSIt->start) { 1166f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner RHSIt = std::upper_bound(RHSIt, RHSEnd, LHSIt->start); 1167f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner if (RHSIt != RHS.begin()) --RHSIt; 1168f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner } 1169f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner 1170f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner SmallVector<unsigned, 8> EliminatedLHSVals; 1171f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner 1172f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner while (1) { 1173f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // Determine if these live intervals overlap. 1174f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner bool Overlaps = false; 1175f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner if (LHSIt->start <= RHSIt->start) 1176f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner Overlaps = LHSIt->end > RHSIt->start; 1177f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner else 1178f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner Overlaps = RHSIt->end > LHSIt->start; 1179f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner 1180f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // If the live intervals overlap, there are two interesting cases: if the 1181f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // LHS interval is defined by a copy from the RHS, it's ok and we record 1182f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // that the LHS value # is the same as the RHS. If it's not, then we cannot 1183f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // coallesce these live ranges and we bail out. 1184f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner if (Overlaps) { 1185f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // If we haven't already recorded that this value # is safe, check it. 1186f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner if (!InVector(LHSIt->ValId, EliminatedLHSVals)) { 1187f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // Copy from the RHS? 1188f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner unsigned SrcReg = LHS.getSrcRegForValNum(LHSIt->ValId); 1189f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner if (rep(SrcReg) != RHS.reg) 1190f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner return false; // Nope, bail out. 1191f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner 1192f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner EliminatedLHSVals.push_back(LHSIt->ValId); 1193f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner } 1194f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner 1195f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // We know this entire LHS live range is okay, so skip it now. 1196f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner if (++LHSIt == LHSEnd) break; 1197f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner continue; 1198f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner } 1199f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner 1200f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner if (LHSIt->end < RHSIt->end) { 1201f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner if (++LHSIt == LHSEnd) break; 1202f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner } else { 1203f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // One interesting case to check here. It's possible that we have 1204f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // something like "X3 = Y" which defines a new value number in the LHS, 1205f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // and is the last use of this liverange of the RHS. In this case, we 1206f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // want to notice this copy (so that it gets coallesced away) even though 1207f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // the live ranges don't actually overlap. 1208f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner if (LHSIt->start == RHSIt->end) { 1209f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner if (InVector(LHSIt->ValId, EliminatedLHSVals)) { 1210f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // We already know that this value number is going to be merged in 1211f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // if coallescing succeeds. Just skip the liverange. 1212f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner if (++LHSIt == LHSEnd) break; 1213f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner } else { 1214f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // Otherwise, if this is a copy from the RHS, mark it as being merged 1215f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // in. 1216f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner if (rep(LHS.getSrcRegForValNum(LHSIt->ValId)) == RHS.reg) { 1217f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner EliminatedLHSVals.push_back(LHSIt->ValId); 1218f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner 1219f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // We know this entire LHS live range is okay, so skip it now. 1220f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner if (++LHSIt == LHSEnd) break; 1221f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner } 1222f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner } 1223f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner } 1224f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner 1225f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner if (++RHSIt == RHSEnd) break; 1226f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner } 1227f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner } 1228f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner 1229f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // If we got here, we know that the coallescing will be successful and that 1230f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // the value numbers in EliminatedLHSVals will all be merged together. Since 1231f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // the most common case is that EliminatedLHSVals has a single number, we 1232f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // optimize for it: if there is more than one value, we merge them all into 1233f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // the lowest numbered one, then handle the interval as if we were merging 1234f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // with one value number. 1235f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner unsigned LHSValNo; 1236f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner if (EliminatedLHSVals.size() > 1) { 1237f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // Loop through all the equal value numbers merging them into the smallest 1238f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // one. 1239f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner unsigned Smallest = EliminatedLHSVals[0]; 1240f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner for (unsigned i = 1, e = EliminatedLHSVals.size(); i != e; ++i) { 1241f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner if (EliminatedLHSVals[i] < Smallest) { 1242f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // Merge the current notion of the smallest into the smaller one. 1243f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner LHS.MergeValueNumberInto(Smallest, EliminatedLHSVals[i]); 1244f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner Smallest = EliminatedLHSVals[i]; 1245f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner } else { 1246f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // Merge into the smallest. 1247f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner LHS.MergeValueNumberInto(EliminatedLHSVals[i], Smallest); 1248f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner } 1249f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner } 1250f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner LHSValNo = Smallest; 1251f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner } else { 1252f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner assert(!EliminatedLHSVals.empty() && "No copies from the RHS?"); 1253f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner LHSValNo = EliminatedLHSVals[0]; 1254f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner } 1255f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner 1256f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // Okay, now that there is a single LHS value number that we're merging the 1257f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // RHS into, update the value number info for the LHS to indicate that the 1258f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // value number is defined where the RHS value number was. 1259f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner LHS.setValueNumberInfo(LHSValNo, RHS.getValNumInfo(0)); 1260f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner 1261f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // Okay, the final step is to loop over the RHS live intervals, adding them to 1262f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // the LHS. 1263f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner LHS.MergeRangesInAsValue(RHS, LHSValNo); 1264f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner LHS.weight += RHS.weight; 1265f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner 1266f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner return true; 1267f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner} 1268f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner 12696d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner/// JoinIntervals - Attempt to join these two intervals. On failure, this 12706d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner/// returns false. Otherwise, if one of the intervals being joined is a 12716d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner/// physreg, this method always canonicalizes LHS to be it. The output 12726d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner/// "RHS" will not have been modified, so we can use this information 12736d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner/// below to update aliases. 12746d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattnerbool LiveIntervals::JoinIntervals(LiveInterval &LHS, LiveInterval &RHS) { 12752ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner // Compute the final value assignment, assuming that the live ranges can be 12762ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner // coallesced. 12776d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner SmallVector<int, 16> LHSValNoAssignments; 12786d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner SmallVector<int, 16> RHSValNoAssignments; 127991725b75852443923b419fd23215194cfc65dd88Chris Lattner SmallVector<std::pair<unsigned,unsigned>, 16> ValueNumberInfo; 1280238416c99b2a2baea06ac05a5964bbbbf660f3ddChris Lattner 12816d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner // Compute ultimate value numbers for the LHS and RHS values. 12822ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner if (RHS.containsOneValue()) { 12832ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner // Copies from a liveinterval with a single value are simple to handle and 12842ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner // very common, handle the special case here. This is important, because 12852ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner // often RHS is small and LHS is large (e.g. a physreg). 12862ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner 12872ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner // Find out if the RHS is defined as a copy from some value in the LHS. 12882ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner int RHSValID = -1; 12892ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner std::pair<unsigned,unsigned> RHSValNoInfo; 1290f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner unsigned RHSSrcReg = RHS.getSrcRegForValNum(0); 1291f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner if ((RHSSrcReg == 0 || rep(RHSSrcReg) != LHS.reg)) { 1292f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // If RHS is not defined as a copy from the LHS, we can use simpler and 1293f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // faster checks to see if the live ranges are coallescable. This joiner 1294f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // can't swap the LHS/RHS intervals though. 1295f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner if (!MRegisterInfo::isPhysicalRegister(RHS.reg)) { 1296f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner return SimpleJoin(LHS, RHS); 12972ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner } else { 1298f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner RHSValNoInfo = RHS.getValNumInfo(0); 12992ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner } 13002ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner } else { 1301f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner // It was defined as a copy from the LHS, find out what value # it is. 1302f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner unsigned ValInst = RHS.getInstForValNum(0); 1303f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner RHSValID = LHS.getLiveRangeContaining(ValInst-1)->ValId; 1304f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner RHSValNoInfo = LHS.getValNumInfo(RHSValID); 13052ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner } 13062ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner 1307f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner LHSValNoAssignments.resize(LHS.getNumValNums(), -1); 1308f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner RHSValNoAssignments.resize(RHS.getNumValNums(), -1); 13092ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner ValueNumberInfo.resize(LHS.getNumValNums()); 13102ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner 13112ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner // Okay, *all* of the values in LHS that are defined as a copy from RHS 13122ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner // should now get updated. 13132ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner for (unsigned VN = 0, e = LHS.getNumValNums(); VN != e; ++VN) { 13142ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner if (unsigned LHSSrcReg = LHS.getSrcRegForValNum(VN)) { 13152ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner if (rep(LHSSrcReg) != RHS.reg) { 13162ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner // If this is not a copy from the RHS, its value number will be 13172ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner // unmodified by the coallescing. 13182ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner ValueNumberInfo[VN] = LHS.getValNumInfo(VN); 13192ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner LHSValNoAssignments[VN] = VN; 13202ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner } else if (RHSValID == -1) { 13212ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner // Otherwise, it is a copy from the RHS, and we don't already have a 13222ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner // value# for it. Keep the current value number, but remember it. 13232ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner LHSValNoAssignments[VN] = RHSValID = VN; 13242ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner ValueNumberInfo[VN] = RHSValNoInfo; 13252ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner } else { 13262ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner // Otherwise, use the specified value #. 13272ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner LHSValNoAssignments[VN] = RHSValID; 13282ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner if (VN != (unsigned)RHSValID) 13292ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner ValueNumberInfo[VN].first = ~1U; 13302ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner else 13312ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner ValueNumberInfo[VN] = RHSValNoInfo; 13322ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner } 13332ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner } else { 13342ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner ValueNumberInfo[VN] = LHS.getValNumInfo(VN); 13352ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner LHSValNoAssignments[VN] = VN; 13362ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner } 13372ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner } 13382ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner 13392ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner assert(RHSValID != -1 && "Didn't find value #?"); 13402ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner RHSValNoAssignments[0] = RHSValID; 13412ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner 13422ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner } else { 1343238416c99b2a2baea06ac05a5964bbbbf660f3ddChris Lattner // Loop over the value numbers of the LHS, seeing if any are defined from 1344238416c99b2a2baea06ac05a5964bbbbf660f3ddChris Lattner // the RHS. 13452ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner SmallVector<int, 16> LHSValsDefinedFromRHS; 13462ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner LHSValsDefinedFromRHS.resize(LHS.getNumValNums(), -1); 13472ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner for (unsigned VN = 0, e = LHS.getNumValNums(); VN != e; ++VN) { 13482ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner unsigned ValSrcReg = LHS.getSrcRegForValNum(VN); 13492ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner if (ValSrcReg == 0) // Src not defined by a copy? 13502ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner continue; 13512ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner 1352238416c99b2a2baea06ac05a5964bbbbf660f3ddChris Lattner // DstReg is known to be a register in the LHS interval. If the src is 1353238416c99b2a2baea06ac05a5964bbbbf660f3ddChris Lattner // from the RHS interval, we can use its value #. 13542ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner if (rep(ValSrcReg) != RHS.reg) 13552ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner continue; 13562ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner 13572ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner // Figure out the value # from the RHS. 13582ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner unsigned ValInst = LHS.getInstForValNum(VN); 13592ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner LHSValsDefinedFromRHS[VN] = RHS.getLiveRangeContaining(ValInst-1)->ValId; 13602ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner } 13612ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner 1362238416c99b2a2baea06ac05a5964bbbbf660f3ddChris Lattner // Loop over the value numbers of the RHS, seeing if any are defined from 1363238416c99b2a2baea06ac05a5964bbbbf660f3ddChris Lattner // the LHS. 13642ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner SmallVector<int, 16> RHSValsDefinedFromLHS; 13652ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner RHSValsDefinedFromLHS.resize(RHS.getNumValNums(), -1); 13662ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner for (unsigned VN = 0, e = RHS.getNumValNums(); VN != e; ++VN) { 13672ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner unsigned ValSrcReg = RHS.getSrcRegForValNum(VN); 13682ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner if (ValSrcReg == 0) // Src not defined by a copy? 13692ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner continue; 13702ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner 1371238416c99b2a2baea06ac05a5964bbbbf660f3ddChris Lattner // DstReg is known to be a register in the RHS interval. If the src is 1372238416c99b2a2baea06ac05a5964bbbbf660f3ddChris Lattner // from the LHS interval, we can use its value #. 13732ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner if (rep(ValSrcReg) != LHS.reg) 13742ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner continue; 13752ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner 13762ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner // Figure out the value # from the LHS. 13772ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner unsigned ValInst = RHS.getInstForValNum(VN); 13782ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner RHSValsDefinedFromLHS[VN] = LHS.getLiveRangeContaining(ValInst-1)->ValId; 13792ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner } 13802ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner 1381f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner LHSValNoAssignments.resize(LHS.getNumValNums(), -1); 1382f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner RHSValNoAssignments.resize(RHS.getNumValNums(), -1); 1383f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner ValueNumberInfo.reserve(LHS.getNumValNums() + RHS.getNumValNums()); 1384f21f0205b5dec61f165518887f54e01ab5aab13cChris Lattner 13852ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner for (unsigned VN = 0, e = LHS.getNumValNums(); VN != e; ++VN) { 13868a67f6e848244b00dd706a7e01079d1b39c07731Chris Lattner if (LHSValNoAssignments[VN] >= 0 || LHS.getInstForValNum(VN) == ~2U) 13878a67f6e848244b00dd706a7e01079d1b39c07731Chris Lattner continue; 13882ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner ComputeUltimateVN(VN, ValueNumberInfo, 13892ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner LHSValsDefinedFromRHS, RHSValsDefinedFromLHS, 13902ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner LHSValNoAssignments, RHSValNoAssignments, LHS, RHS); 13912ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner } 13922ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner for (unsigned VN = 0, e = RHS.getNumValNums(); VN != e; ++VN) { 13938a67f6e848244b00dd706a7e01079d1b39c07731Chris Lattner if (RHSValNoAssignments[VN] >= 0 || RHS.getInstForValNum(VN) == ~2U) 13948a67f6e848244b00dd706a7e01079d1b39c07731Chris Lattner continue; 13958a67f6e848244b00dd706a7e01079d1b39c07731Chris Lattner // If this value number isn't a copy from the LHS, it's a new number. 13968a67f6e848244b00dd706a7e01079d1b39c07731Chris Lattner if (RHSValsDefinedFromLHS[VN] == -1) { 13978a67f6e848244b00dd706a7e01079d1b39c07731Chris Lattner ValueNumberInfo.push_back(RHS.getValNumInfo(VN)); 13988a67f6e848244b00dd706a7e01079d1b39c07731Chris Lattner RHSValNoAssignments[VN] = ValueNumberInfo.size()-1; 13998a67f6e848244b00dd706a7e01079d1b39c07731Chris Lattner continue; 14008a67f6e848244b00dd706a7e01079d1b39c07731Chris Lattner } 14018a67f6e848244b00dd706a7e01079d1b39c07731Chris Lattner 14022ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner ComputeUltimateVN(VN, ValueNumberInfo, 14032ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner RHSValsDefinedFromLHS, LHSValsDefinedFromRHS, 14042ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner RHSValNoAssignments, LHSValNoAssignments, RHS, LHS); 14052ebfa0c61823c5d7528b1b3235106c30cb8d53f1Chris Lattner } 14066d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner } 14076d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner 14086d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner // Armed with the mappings of LHS/RHS values to ultimate values, walk the 14096d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner // interval lists to see if these intervals are coallescable. 14106d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner LiveInterval::const_iterator I = LHS.begin(); 14116d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner LiveInterval::const_iterator IE = LHS.end(); 14126d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner LiveInterval::const_iterator J = RHS.begin(); 14136d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner LiveInterval::const_iterator JE = RHS.end(); 14146d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner 14156d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner // Skip ahead until the first place of potential sharing. 14166d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner if (I->start < J->start) { 14176d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner I = std::upper_bound(I, IE, J->start); 14186d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner if (I != LHS.begin()) --I; 14196d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner } else if (J->start < I->start) { 14206d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner J = std::upper_bound(J, JE, I->start); 14216d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner if (J != RHS.begin()) --J; 14226d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner } 14236d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner 14246d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner while (1) { 14256d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner // Determine if these two live ranges overlap. 14266d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner bool Overlaps; 14276d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner if (I->start < J->start) { 14286d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner Overlaps = I->end > J->start; 14296d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner } else { 14306d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner Overlaps = J->end > I->start; 14316d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner } 14326d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner 14336d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner // If so, check value # info to determine if they are really different. 14346d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner if (Overlaps) { 14356d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner // If the live range overlap will map to the same value number in the 14366d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner // result liverange, we can still coallesce them. If not, we can't. 14376d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner if (LHSValNoAssignments[I->ValId] != RHSValNoAssignments[J->ValId]) 14386d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner return false; 14396d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner } 14406d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner 14416d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner if (I->end < J->end) { 14426d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner ++I; 14436d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner if (I == IE) break; 14446d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner } else { 14456d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner ++J; 14466d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner if (J == JE) break; 14476d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner } 14486d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner } 14496d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner 14506d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner // If we get here, we know that we can coallesce the live ranges. Ask the 14516d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner // intervals to coallesce themselves now. 14526d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner LHS.join(RHS, &LHSValNoAssignments[0], &RHSValNoAssignments[0], 145391725b75852443923b419fd23215194cfc65dd88Chris Lattner ValueNumberInfo); 14546d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner return true; 14556d8fbef015ff836bcb8f64f52c49805e43f8ea9fChris Lattner} 1456f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 1457f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 1458cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattnernamespace { 1459cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner // DepthMBBCompare - Comparison predicate that sort first based on the loop 1460cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner // depth of the basic block (the unsigned), and then on the MBB number. 1461cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner struct DepthMBBCompare { 1462cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner typedef std::pair<unsigned, MachineBasicBlock*> DepthMBBPair; 1463cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner bool operator()(const DepthMBBPair &LHS, const DepthMBBPair &RHS) const { 1464cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner if (LHS.first > RHS.first) return true; // Deeper loops first 1465706515727c6d024015fffded2b3109a4f0ac5299Alkis Evlogimenos return LHS.first == RHS.first && 14661a8ea01f01b30e28e4e3ac0e3a344c4a4d579270Alkis Evlogimenos LHS.second->getNumber() < RHS.second->getNumber(); 1467cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner } 1468cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner }; 1469cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner} 1470cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner 1471f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 14721acb17cb8392dce33079fe45f383944ec6616757Chris Lattnervoid LiveIntervals::CopyCoallesceInMBB(MachineBasicBlock *MBB, 14731acb17cb8392dce33079fe45f383944ec6616757Chris Lattner std::vector<CopyRec> &TryAgain) { 1474bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << ((Value*)MBB->getBasicBlock())->getName() << ":\n"; 1475f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 1476f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner for (MachineBasicBlock::iterator MII = MBB->begin(), E = MBB->end(); 1477f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner MII != E;) { 1478f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner MachineInstr *Inst = MII++; 1479f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 1480f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner // If this isn't a copy, we can't join intervals. 1481f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner unsigned SrcReg, DstReg; 1482f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner if (!tii_->isMoveInstr(*Inst, SrcReg, DstReg)) continue; 1483f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 14841acb17cb8392dce33079fe45f383944ec6616757Chris Lattner if (!JoinCopy(Inst, SrcReg, DstReg)) 14851acb17cb8392dce33079fe45f383944ec6616757Chris Lattner TryAgain.push_back(getCopyRec(Inst, SrcReg, DstReg)); 1486f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner } 1487f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner} 1488f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 1489f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 1490cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattnervoid LiveIntervals::joinIntervals() { 1491bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "********** JOINING INTERVALS ***********\n"; 14921c5c0444f1326b58cf05015651f36f2b04ca322dChris Lattner 149388d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng JoinedLIs.resize(getNumIntervals()); 149488d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng JoinedLIs.reset(); 149588d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng 14961acb17cb8392dce33079fe45f383944ec6616757Chris Lattner std::vector<CopyRec> TryAgainList; 1497cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner const LoopInfo &LI = getAnalysis<LoopInfo>(); 1498cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner if (LI.begin() == LI.end()) { 1499cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner // If there are no loops in the function, join intervals in function order. 15001c5c0444f1326b58cf05015651f36f2b04ca322dChris Lattner for (MachineFunction::iterator I = mf_->begin(), E = mf_->end(); 15011c5c0444f1326b58cf05015651f36f2b04ca322dChris Lattner I != E; ++I) 15021acb17cb8392dce33079fe45f383944ec6616757Chris Lattner CopyCoallesceInMBB(I, TryAgainList); 1503cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner } else { 1504cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner // Otherwise, join intervals in inner loops before other intervals. 1505cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner // Unfortunately we can't just iterate over loop hierarchy here because 1506cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner // there may be more MBB's than BB's. Collect MBB's for sorting. 1507cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner std::vector<std::pair<unsigned, MachineBasicBlock*> > MBBs; 1508cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner for (MachineFunction::iterator I = mf_->begin(), E = mf_->end(); 1509cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner I != E; ++I) 1510cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner MBBs.push_back(std::make_pair(LI.getLoopDepth(I->getBasicBlock()), I)); 1511cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner 1512cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner // Sort by loop depth. 1513cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner std::sort(MBBs.begin(), MBBs.end(), DepthMBBCompare()); 1514cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner 1515706515727c6d024015fffded2b3109a4f0ac5299Alkis Evlogimenos // Finally, join intervals in loop nest order. 1516cc0d156f7bca0811aade0a95b0e7419176383c90Chris Lattner for (unsigned i = 0, e = MBBs.size(); i != e; ++i) 15171acb17cb8392dce33079fe45f383944ec6616757Chris Lattner CopyCoallesceInMBB(MBBs[i].second, TryAgainList); 15181acb17cb8392dce33079fe45f383944ec6616757Chris Lattner } 15191acb17cb8392dce33079fe45f383944ec6616757Chris Lattner 15201acb17cb8392dce33079fe45f383944ec6616757Chris Lattner // Joining intervals can allow other intervals to be joined. Iteratively join 15211acb17cb8392dce33079fe45f383944ec6616757Chris Lattner // until we make no progress. 15221acb17cb8392dce33079fe45f383944ec6616757Chris Lattner bool ProgressMade = true; 15231acb17cb8392dce33079fe45f383944ec6616757Chris Lattner while (ProgressMade) { 15241acb17cb8392dce33079fe45f383944ec6616757Chris Lattner ProgressMade = false; 15251acb17cb8392dce33079fe45f383944ec6616757Chris Lattner 15261acb17cb8392dce33079fe45f383944ec6616757Chris Lattner for (unsigned i = 0, e = TryAgainList.size(); i != e; ++i) { 15271acb17cb8392dce33079fe45f383944ec6616757Chris Lattner CopyRec &TheCopy = TryAgainList[i]; 15281acb17cb8392dce33079fe45f383944ec6616757Chris Lattner if (TheCopy.MI && 15291acb17cb8392dce33079fe45f383944ec6616757Chris Lattner JoinCopy(TheCopy.MI, TheCopy.SrcReg, TheCopy.DstReg)) { 15301acb17cb8392dce33079fe45f383944ec6616757Chris Lattner TheCopy.MI = 0; // Mark this one as done. 15311acb17cb8392dce33079fe45f383944ec6616757Chris Lattner ProgressMade = true; 15321acb17cb8392dce33079fe45f383944ec6616757Chris Lattner } 15331acb17cb8392dce33079fe45f383944ec6616757Chris Lattner } 1534f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner } 153588d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng 153688d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng // Some live range has been lengthened due to colaescing, eliminate the 153788d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng // unnecessary kills. 153888d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng int RegNum = JoinedLIs.find_first(); 153988d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng while (RegNum != -1) { 154088d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng unsigned Reg = RegNum + MRegisterInfo::FirstVirtualRegister; 154188d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng unsigned repReg = rep(Reg); 154288d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng LiveInterval &LI = getInterval(repReg); 154388d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng LiveVariables::VarInfo& svi = lv_->getVarInfo(Reg); 154488d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng for (unsigned i = 0, e = svi.Kills.size(); i != e; ++i) { 154588d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng MachineInstr *Kill = svi.Kills[i]; 154688d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng // Suppose vr1 = op vr2, x 154788d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng // and vr1 and vr2 are coalesced. vr2 should still be marked kill 154888d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng // unless it is a two-address operand. 154988d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng if (isRemoved(Kill) || hasRegisterDef(Kill, repReg)) 155088d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng continue; 155188d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng if (LI.liveAt(getInstructionIndex(Kill) + InstrSlots::NUM)) 155288d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng unsetRegisterKill(Kill, repReg); 155388d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng } 155488d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng RegNum = JoinedLIs.find_next(RegNum); 155588d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng } 1556f7da2c7b0c6293c268881628fc351bed7763f1f4Chris Lattner 1557bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "*** Register mapping ***\n"; 1558bdc679d564e67a81792e463f6614b0088f975025Bill Wendling for (int i = 0, e = r2rMap_.size(); i != e; ++i) 1559bdc679d564e67a81792e463f6614b0088f975025Bill Wendling if (r2rMap_[i]) { 1560bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << " reg " << i << " -> "; 1561bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DEBUG(printRegName(r2rMap_[i])); 1562bdc679d564e67a81792e463f6614b0088f975025Bill Wendling DOUT << "\n"; 1563bdc679d564e67a81792e463f6614b0088f975025Bill Wendling } 15641c5c0444f1326b58cf05015651f36f2b04ca322dChris Lattner} 15651c5c0444f1326b58cf05015651f36f2b04ca322dChris Lattner 1566647c15e58ed4c3fda81041d401ca7547639958dcEvan Cheng/// Return true if the two specified registers belong to different register 1567647c15e58ed4c3fda81041d401ca7547639958dcEvan Cheng/// classes. The registers may be either phys or virt regs. 1568647c15e58ed4c3fda81041d401ca7547639958dcEvan Chengbool LiveIntervals::differingRegisterClasses(unsigned RegA, 1569647c15e58ed4c3fda81041d401ca7547639958dcEvan Cheng unsigned RegB) const { 15707ac2d3146a196fa0120c579ecd2ddd69652ad230Chris Lattner 15717ac2d3146a196fa0120c579ecd2ddd69652ad230Chris Lattner // Get the register classes for the first reg. 1572ad3c74fc9b52b652859807580c8e40b67394d689Chris Lattner if (MRegisterInfo::isPhysicalRegister(RegA)) { 1573edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman assert(MRegisterInfo::isVirtualRegister(RegB) && 1574ad3c74fc9b52b652859807580c8e40b67394d689Chris Lattner "Shouldn't consider two physregs!"); 1575647c15e58ed4c3fda81041d401ca7547639958dcEvan Cheng return !mf_->getSSARegMap()->getRegClass(RegB)->contains(RegA); 1576ad3c74fc9b52b652859807580c8e40b67394d689Chris Lattner } 15777ac2d3146a196fa0120c579ecd2ddd69652ad230Chris Lattner 15787ac2d3146a196fa0120c579ecd2ddd69652ad230Chris Lattner // Compare against the regclass for the second reg. 1579647c15e58ed4c3fda81041d401ca7547639958dcEvan Cheng const TargetRegisterClass *RegClass = mf_->getSSARegMap()->getRegClass(RegA); 1580647c15e58ed4c3fda81041d401ca7547639958dcEvan Cheng if (MRegisterInfo::isVirtualRegister(RegB)) 1581647c15e58ed4c3fda81041d401ca7547639958dcEvan Cheng return RegClass != mf_->getSSARegMap()->getRegClass(RegB); 1582647c15e58ed4c3fda81041d401ca7547639958dcEvan Cheng else 1583647c15e58ed4c3fda81041d401ca7547639958dcEvan Cheng return !RegClass->contains(RegB); 15847ac2d3146a196fa0120c579ecd2ddd69652ad230Chris Lattner} 15857ac2d3146a196fa0120c579ecd2ddd69652ad230Chris Lattner 1586edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng/// lastRegisterUse - Returns the last use of the specific register between 1587edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng/// cycles Start and End. It also returns the use operand by reference. It 1588edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng/// returns NULL if there are no uses. 1589edeffb37dc41591b3d3943a5c02c04e55d348524Evan ChengMachineInstr * 1590edeffb37dc41591b3d3943a5c02c04e55d348524Evan ChengLiveIntervals::lastRegisterUse(unsigned Reg, unsigned Start, unsigned End, 1591edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng MachineOperand *&MOU) { 1592edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng int e = (End-1) / InstrSlots::NUM * InstrSlots::NUM; 1593edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng int s = Start; 1594edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng while (e >= s) { 1595b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng // Skip deleted instructions 1596edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng MachineInstr *MI = getInstructionFromIndex(e); 1597edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng while ((e - InstrSlots::NUM) >= s && !MI) { 1598edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng e -= InstrSlots::NUM; 1599edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng MI = getInstructionFromIndex(e); 1600edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng } 1601edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng if (e < s || MI == NULL) 1602edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng return NULL; 1603b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng 1604edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng for (unsigned i = 0, NumOps = MI->getNumOperands(); i != NumOps; ++i) { 1605b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng MachineOperand &MO = MI->getOperand(i); 1606b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng if (MO.isReg() && MO.isUse() && MO.getReg() && 1607edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng mri_->regsOverlap(rep(MO.getReg()), Reg)) { 1608edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng MOU = &MO; 1609edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng return MI; 1610edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng } 1611b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng } 1612edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng 1613edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng e -= InstrSlots::NUM; 1614b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng } 1615b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng 1616edeffb37dc41591b3d3943a5c02c04e55d348524Evan Cheng return NULL; 1617b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng} 1618b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng 161930cac02a925c9d56613711b0e77099cb7252bc9bEvan Cheng/// unsetRegisterKill - Unset IsKill property of all uses of specific register 162030cac02a925c9d56613711b0e77099cb7252bc9bEvan Cheng/// of the specific instruction. 162130cac02a925c9d56613711b0e77099cb7252bc9bEvan Chengvoid LiveIntervals::unsetRegisterKill(MachineInstr *MI, unsigned Reg) { 162230cac02a925c9d56613711b0e77099cb7252bc9bEvan Cheng for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { 162330cac02a925c9d56613711b0e77099cb7252bc9bEvan Cheng MachineOperand &MO = MI->getOperand(i); 162430cac02a925c9d56613711b0e77099cb7252bc9bEvan Cheng if (MO.isReg() && MO.isUse() && MO.isKill() && MO.getReg() && 162530cac02a925c9d56613711b0e77099cb7252bc9bEvan Cheng mri_->regsOverlap(rep(MO.getReg()), Reg)) 162630cac02a925c9d56613711b0e77099cb7252bc9bEvan Cheng MO.unsetIsKill(); 162730cac02a925c9d56613711b0e77099cb7252bc9bEvan Cheng } 162830cac02a925c9d56613711b0e77099cb7252bc9bEvan Cheng} 162930cac02a925c9d56613711b0e77099cb7252bc9bEvan Cheng 163088d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng/// hasRegisterDef - True if the instruction defines the specific register. 163188d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng/// 163288d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Chengbool LiveIntervals::hasRegisterDef(MachineInstr *MI, unsigned Reg) { 163388d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { 163488d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng MachineOperand &MO = MI->getOperand(i); 163588d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng if (MO.isReg() && MO.isDef() && 163688d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng mri_->regsOverlap(rep(MO.getReg()), Reg)) 163788d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng return true; 163888d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng } 163988d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng return false; 164088d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng} 164188d1f587d2205b4275dc4c0319a5f2d4d1e6fd42Evan Cheng 1642a1613db62fec94845aa8306232fb665273615badAlkis EvlogimenosLiveInterval LiveIntervals::createInterval(unsigned reg) { 1643edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman float Weight = MRegisterInfo::isPhysicalRegister(reg) ? 16447902c75331fa8f38fc8380f5573d935c0d149ef5Jim Laskey HUGE_VALF : 0.0F; 1645a1613db62fec94845aa8306232fb665273615badAlkis Evlogimenos return LiveInterval(reg, Weight); 16469a8b490735d216435862a3d52e669357f165550fAlkis Evlogimenos} 1647