LiveRangeEdit.cpp revision 529616299f109f58e2a8217a1a760ba961266459
17842a741eb0e1baa35af8c3bb5884655c1edaa9eJim Grosbach//===-- LiveRangeEdit.cpp - Basic tools for editing a register live range -===// 2a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen// 3a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen// The LLVM Compiler Infrastructure 4a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen// 5a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen// This file is distributed under the University of Illinois Open Source 6a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen// License. See LICENSE.TXT for details. 7a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen// 8a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen//===----------------------------------------------------------------------===// 9a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen// 10a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen// The LiveRangeEdit class represents changes done to a virtual register when it 11a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen// is spilled or split. 12a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen//===----------------------------------------------------------------------===// 13a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen 14cf610d07de3ba4929bb5d00e084877dd974b44a1Jakob Stoklund Olesen#define DEBUG_TYPE "regalloc" 15d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/CodeGen/LiveRangeEdit.h" 16e9bd4ea5fda4957c373a3bbc14803d9670041dccJakob Stoklund Olesen#include "llvm/ADT/Statistic.h" 176094bd87d845afabba5b99ec4848fa6116bac682Jakob Stoklund Olesen#include "llvm/CodeGen/CalcSpillWeights.h" 18a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen#include "llvm/CodeGen/LiveIntervalAnalysis.h" 19a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen#include "llvm/CodeGen/MachineRegisterInfo.h" 201ead68d769f27f6d68d4aaeffe4199fa2cacbc95Jakob Stoklund Olesen#include "llvm/CodeGen/VirtRegMap.h" 215881799d0cccbd814ec1b0f0509df9be1f63c6cbJakob Stoklund Olesen#include "llvm/Support/Debug.h" 225881799d0cccbd814ec1b0f0509df9be1f63c6cbJakob Stoklund Olesen#include "llvm/Support/raw_ostream.h" 23d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/Target/TargetInstrInfo.h" 24a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen 25a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesenusing namespace llvm; 26a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen 27e9bd4ea5fda4957c373a3bbc14803d9670041dccJakob Stoklund OlesenSTATISTIC(NumDCEDeleted, "Number of instructions deleted by DCE"); 28e9bd4ea5fda4957c373a3bbc14803d9670041dccJakob Stoklund OlesenSTATISTIC(NumDCEFoldedLoads, "Number of single use loads folded after DCE"); 29e9bd4ea5fda4957c373a3bbc14803d9670041dccJakob Stoklund OlesenSTATISTIC(NumFracRanges, "Number of live ranges fractured by DCE"); 30e9bd4ea5fda4957c373a3bbc14803d9670041dccJakob Stoklund Olesen 312d24e2a396a1d211baaeedf32148a3b657240170David Blaikievoid LiveRangeEdit::Delegate::anchor() { } 322d24e2a396a1d211baaeedf32148a3b657240170David Blaikie 338a06af96698537377275dd7848db69915638dd26Pete CooperLiveInterval &LiveRangeEdit::createFrom(unsigned OldReg) { 346a3dbd3b25bbc99bd1a233d6a74ddea3493ba6acJakob Stoklund Olesen unsigned VReg = MRI.createVirtualRegister(MRI.getRegClass(OldReg)); 352e267ae7b8caf7192a3793eb3b78937ff83f794dPete Cooper if (VRM) { 362e267ae7b8caf7192a3793eb3b78937ff83f794dPete Cooper VRM->grow(); 372e267ae7b8caf7192a3793eb3b78937ff83f794dPete Cooper VRM->setIsSplitFromReg(VReg, VRM->getOriginal(OldReg)); 382e267ae7b8caf7192a3793eb3b78937ff83f794dPete Cooper } 396a3dbd3b25bbc99bd1a233d6a74ddea3493ba6acJakob Stoklund Olesen LiveInterval &LI = LIS.getOrCreateInterval(VReg); 40c696c8bd35a8ab293879e821142dd9136201f16eJakob Stoklund Olesen NewRegs.push_back(&LI); 416a3dbd3b25bbc99bd1a233d6a74ddea3493ba6acJakob Stoklund Olesen return LI; 42a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen} 43a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen 443b7d917dec53a742fcb14802557ee75d35185968Jakob Stoklund Olesenbool LiveRangeEdit::checkRematerializable(VNInfo *VNI, 452ef661b0e8de0d4186c5f9cc990adce0a2493b17Jakob Stoklund Olesen const MachineInstr *DefMI, 462ef661b0e8de0d4186c5f9cc990adce0a2493b17Jakob Stoklund Olesen AliasAnalysis *aa) { 472ef661b0e8de0d4186c5f9cc990adce0a2493b17Jakob Stoklund Olesen assert(DefMI && "Missing instruction"); 48c696c8bd35a8ab293879e821142dd9136201f16eJakob Stoklund Olesen ScannedRemattable = true; 498a06af96698537377275dd7848db69915638dd26Pete Cooper if (!TII.isTriviallyReMaterializable(DefMI, aa)) 503b7d917dec53a742fcb14802557ee75d35185968Jakob Stoklund Olesen return false; 51c696c8bd35a8ab293879e821142dd9136201f16eJakob Stoklund Olesen Remattable.insert(VNI); 523b7d917dec53a742fcb14802557ee75d35185968Jakob Stoklund Olesen return true; 532ef661b0e8de0d4186c5f9cc990adce0a2493b17Jakob Stoklund Olesen} 542ef661b0e8de0d4186c5f9cc990adce0a2493b17Jakob Stoklund Olesen 558a06af96698537377275dd7848db69915638dd26Pete Coopervoid LiveRangeEdit::scanRemattable(AliasAnalysis *aa) { 5620942dcd8634ad75091fe89669868cfebf74e869Jakob Stoklund Olesen for (LiveInterval::vni_iterator I = getParent().vni_begin(), 5720942dcd8634ad75091fe89669868cfebf74e869Jakob Stoklund Olesen E = getParent().vni_end(); I != E; ++I) { 58080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen VNInfo *VNI = *I; 59080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen if (VNI->isUnused()) 60080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen continue; 618a06af96698537377275dd7848db69915638dd26Pete Cooper MachineInstr *DefMI = LIS.getInstructionFromIndex(VNI->def); 62080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen if (!DefMI) 63080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen continue; 648a06af96698537377275dd7848db69915638dd26Pete Cooper checkRematerializable(VNI, DefMI, aa); 65080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen } 66c696c8bd35a8ab293879e821142dd9136201f16eJakob Stoklund Olesen ScannedRemattable = true; 67080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen} 68080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen 698a06af96698537377275dd7848db69915638dd26Pete Cooperbool LiveRangeEdit::anyRematerializable(AliasAnalysis *aa) { 70c696c8bd35a8ab293879e821142dd9136201f16eJakob Stoklund Olesen if (!ScannedRemattable) 718a06af96698537377275dd7848db69915638dd26Pete Cooper scanRemattable(aa); 72c696c8bd35a8ab293879e821142dd9136201f16eJakob Stoklund Olesen return !Remattable.empty(); 73080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen} 74080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen 75a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen/// allUsesAvailableAt - Return true if all registers used by OrigMI at 76a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen/// OrigIdx are also available with the same value at UseIdx. 77a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesenbool LiveRangeEdit::allUsesAvailableAt(const MachineInstr *OrigMI, 78a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen SlotIndex OrigIdx, 79c2248b0e7895446cccf934b57c6aa3aa712e20d1Jakub Staszak SlotIndex UseIdx) const { 802debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen OrigIdx = OrigIdx.getRegSlot(true); 812debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen UseIdx = UseIdx.getRegSlot(true); 82a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen for (unsigned i = 0, e = OrigMI->getNumOperands(); i != e; ++i) { 83a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen const MachineOperand &MO = OrigMI->getOperand(i); 84834a9cdbb78c1a16c8ceecb018a324a3ba31c365Jakob Stoklund Olesen if (!MO.isReg() || !MO.getReg() || !MO.readsReg()) 85a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen continue; 86a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen 87834a9cdbb78c1a16c8ceecb018a324a3ba31c365Jakob Stoklund Olesen // We can't remat physreg uses, unless it is a constant. 88834a9cdbb78c1a16c8ceecb018a324a3ba31c365Jakob Stoklund Olesen if (TargetRegisterInfo::isPhysicalRegister(MO.getReg())) { 89ddc26d89362330995f59ad29eb8bb439a817050bJakob Stoklund Olesen if (MRI.isConstantPhysReg(MO.getReg(), *OrigMI->getParent()->getParent())) 90834a9cdbb78c1a16c8ceecb018a324a3ba31c365Jakob Stoklund Olesen continue; 91834a9cdbb78c1a16c8ceecb018a324a3ba31c365Jakob Stoklund Olesen return false; 92834a9cdbb78c1a16c8ceecb018a324a3ba31c365Jakob Stoklund Olesen } 93834a9cdbb78c1a16c8ceecb018a324a3ba31c365Jakob Stoklund Olesen 948a06af96698537377275dd7848db69915638dd26Pete Cooper LiveInterval &li = LIS.getInterval(MO.getReg()); 95a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen const VNInfo *OVNI = li.getVNInfoAt(OrigIdx); 96a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen if (!OVNI) 97a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen continue; 98320db3f8052c9f506d9ea043ba5da534df40aa08Jakob Stoklund Olesen 99320db3f8052c9f506d9ea043ba5da534df40aa08Jakob Stoklund Olesen // Don't allow rematerialization immediately after the original def. 100320db3f8052c9f506d9ea043ba5da534df40aa08Jakob Stoklund Olesen // It would be incorrect if OrigMI redefines the register. 101320db3f8052c9f506d9ea043ba5da534df40aa08Jakob Stoklund Olesen // See PR14098. 102320db3f8052c9f506d9ea043ba5da534df40aa08Jakob Stoklund Olesen if (SlotIndex::isSameInstr(OrigIdx, UseIdx)) 103320db3f8052c9f506d9ea043ba5da534df40aa08Jakob Stoklund Olesen return false; 104320db3f8052c9f506d9ea043ba5da534df40aa08Jakob Stoklund Olesen 105a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen if (OVNI != li.getVNInfoAt(UseIdx)) 106a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen return false; 107a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen } 108a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen return true; 109a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen} 110a17768f5822ab62bc18608e5ba473187bf726b84Jakob Stoklund Olesen 111b80e973c95034e5754d888140497a9658a7c1dedJakob Stoklund Olesenbool LiveRangeEdit::canRematerializeAt(Remat &RM, 112b80e973c95034e5754d888140497a9658a7c1dedJakob Stoklund Olesen SlotIndex UseIdx, 1138a06af96698537377275dd7848db69915638dd26Pete Cooper bool cheapAsAMove) { 114c696c8bd35a8ab293879e821142dd9136201f16eJakob Stoklund Olesen assert(ScannedRemattable && "Call anyRematerializable first"); 115080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen 116080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen // Use scanRemattable info. 117c696c8bd35a8ab293879e821142dd9136201f16eJakob Stoklund Olesen if (!Remattable.count(RM.ParentVNI)) 118b80e973c95034e5754d888140497a9658a7c1dedJakob Stoklund Olesen return false; 119080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen 1202ef661b0e8de0d4186c5f9cc990adce0a2493b17Jakob Stoklund Olesen // No defining instruction provided. 1212ef661b0e8de0d4186c5f9cc990adce0a2493b17Jakob Stoklund Olesen SlotIndex DefIdx; 1222ef661b0e8de0d4186c5f9cc990adce0a2493b17Jakob Stoklund Olesen if (RM.OrigMI) 1238a06af96698537377275dd7848db69915638dd26Pete Cooper DefIdx = LIS.getInstructionIndex(RM.OrigMI); 1242ef661b0e8de0d4186c5f9cc990adce0a2493b17Jakob Stoklund Olesen else { 1252ef661b0e8de0d4186c5f9cc990adce0a2493b17Jakob Stoklund Olesen DefIdx = RM.ParentVNI->def; 1268a06af96698537377275dd7848db69915638dd26Pete Cooper RM.OrigMI = LIS.getInstructionFromIndex(DefIdx); 1272ef661b0e8de0d4186c5f9cc990adce0a2493b17Jakob Stoklund Olesen assert(RM.OrigMI && "No defining instruction for remattable value"); 1282ef661b0e8de0d4186c5f9cc990adce0a2493b17Jakob Stoklund Olesen } 129080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen 130080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen // If only cheap remats were requested, bail out early. 1315a96b3dad2f634c9081c8b2b6c2575441dc5a2bdEvan Cheng if (cheapAsAMove && !RM.OrigMI->isAsCheapAsAMove()) 132b80e973c95034e5754d888140497a9658a7c1dedJakob Stoklund Olesen return false; 133080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen 134080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen // Verify that all used registers are available with the same values. 1358a06af96698537377275dd7848db69915638dd26Pete Cooper if (!allUsesAvailableAt(RM.OrigMI, DefIdx, UseIdx)) 136b80e973c95034e5754d888140497a9658a7c1dedJakob Stoklund Olesen return false; 137080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen 138b80e973c95034e5754d888140497a9658a7c1dedJakob Stoklund Olesen return true; 139080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen} 140080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen 141080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund OlesenSlotIndex LiveRangeEdit::rematerializeAt(MachineBasicBlock &MBB, 142080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen MachineBasicBlock::iterator MI, 143080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen unsigned DestReg, 144080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen const Remat &RM, 145bb30dd40ed0873e39fec4dfa321091a0c8d1abfcJakob Stoklund Olesen const TargetRegisterInfo &tri, 146bb30dd40ed0873e39fec4dfa321091a0c8d1abfcJakob Stoklund Olesen bool Late) { 147080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen assert(RM.OrigMI && "Invalid remat"); 1488a06af96698537377275dd7848db69915638dd26Pete Cooper TII.reMaterialize(MBB, MI, DestReg, 0, RM.OrigMI, tri); 149c696c8bd35a8ab293879e821142dd9136201f16eJakob Stoklund Olesen Rematted.insert(RM.ParentVNI); 1508a06af96698537377275dd7848db69915638dd26Pete Cooper return LIS.getSlotIndexes()->insertMachineInstrInMaps(--MI, Late) 1512debd48ca790ac01be6e12e094fdf4fdcadc8364Jakob Stoklund Olesen .getRegSlot(); 152080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen} 153080c316ff8a066cd164d9a8f92df509d8cb63110Jakob Stoklund Olesen 1548a06af96698537377275dd7848db69915638dd26Pete Coopervoid LiveRangeEdit::eraseVirtReg(unsigned Reg) { 155c696c8bd35a8ab293879e821142dd9136201f16eJakob Stoklund Olesen if (TheDelegate && TheDelegate->LRE_CanEraseVirtReg(Reg)) 1567792e980c43536814ea42448db9799b4da32fef6Jakob Stoklund Olesen LIS.removeInterval(Reg); 1577792e980c43536814ea42448db9799b4da32fef6Jakob Stoklund Olesen} 1587792e980c43536814ea42448db9799b4da32fef6Jakob Stoklund Olesen 1593520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesenbool LiveRangeEdit::foldAsLoad(LiveInterval *LI, 1608a06af96698537377275dd7848db69915638dd26Pete Cooper SmallVectorImpl<MachineInstr*> &Dead) { 1613520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen MachineInstr *DefMI = 0, *UseMI = 0; 1623520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen 1633520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen // Check that there is a single def and a single use. 1643520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen for (MachineRegisterInfo::reg_nodbg_iterator I = MRI.reg_nodbg_begin(LI->reg), 1653520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen E = MRI.reg_nodbg_end(); I != E; ++I) { 1663520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen MachineOperand &MO = I.getOperand(); 1673520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen MachineInstr *MI = MO.getParent(); 1683520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen if (MO.isDef()) { 1693520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen if (DefMI && DefMI != MI) 1703520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen return false; 1715a96b3dad2f634c9081c8b2b6c2575441dc5a2bdEvan Cheng if (!MI->canFoldAsLoad()) 1723520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen return false; 1733520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen DefMI = MI; 1743520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen } else if (!MO.isUndef()) { 1753520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen if (UseMI && UseMI != MI) 1763520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen return false; 1773520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen // FIXME: Targets don't know how to fold subreg uses. 1783520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen if (MO.getSubReg()) 1793520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen return false; 1803520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen UseMI = MI; 1813520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen } 1823520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen } 1833520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen if (!DefMI || !UseMI) 1843520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen return false; 1853520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen 1862ec0cda5d5ede57022eb7dc5e7170f4fa420cb2bJakob Stoklund Olesen // Since we're moving the DefMI load, make sure we're not extending any live 1872ec0cda5d5ede57022eb7dc5e7170f4fa420cb2bJakob Stoklund Olesen // ranges. 1882ec0cda5d5ede57022eb7dc5e7170f4fa420cb2bJakob Stoklund Olesen if (!allUsesAvailableAt(DefMI, 1892ec0cda5d5ede57022eb7dc5e7170f4fa420cb2bJakob Stoklund Olesen LIS.getInstructionIndex(DefMI), 1902ec0cda5d5ede57022eb7dc5e7170f4fa420cb2bJakob Stoklund Olesen LIS.getInstructionIndex(UseMI))) 1912ec0cda5d5ede57022eb7dc5e7170f4fa420cb2bJakob Stoklund Olesen return false; 1922ec0cda5d5ede57022eb7dc5e7170f4fa420cb2bJakob Stoklund Olesen 1932ec0cda5d5ede57022eb7dc5e7170f4fa420cb2bJakob Stoklund Olesen // We also need to make sure it is safe to move the load. 1942ec0cda5d5ede57022eb7dc5e7170f4fa420cb2bJakob Stoklund Olesen // Assume there are stores between DefMI and UseMI. 1952ec0cda5d5ede57022eb7dc5e7170f4fa420cb2bJakob Stoklund Olesen bool SawStore = true; 1962ec0cda5d5ede57022eb7dc5e7170f4fa420cb2bJakob Stoklund Olesen if (!DefMI->isSafeToMove(&TII, 0, SawStore)) 1972ec0cda5d5ede57022eb7dc5e7170f4fa420cb2bJakob Stoklund Olesen return false; 1982ec0cda5d5ede57022eb7dc5e7170f4fa420cb2bJakob Stoklund Olesen 1993520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen DEBUG(dbgs() << "Try to fold single def: " << *DefMI 2003520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen << " into single use: " << *UseMI); 2013520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen 2023520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen SmallVector<unsigned, 8> Ops; 2033520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen if (UseMI->readsWritesVirtualRegister(LI->reg, &Ops).second) 2043520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen return false; 2053520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen 2063520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen MachineInstr *FoldMI = TII.foldMemoryOperand(UseMI, Ops, DefMI); 2073520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen if (!FoldMI) 2083520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen return false; 2093520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen DEBUG(dbgs() << " folded: " << *FoldMI); 2103520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen LIS.ReplaceMachineInstrInMaps(UseMI, FoldMI); 2113520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen UseMI->eraseFromParent(); 2123520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen DefMI->addRegisterDead(LI->reg, 0); 2133520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen Dead.push_back(DefMI); 214e9bd4ea5fda4957c373a3bbc14803d9670041dccJakob Stoklund Olesen ++NumDCEFoldedLoads; 2153520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen return true; 2163520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen} 2173520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen 218f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick/// Find all live intervals that need to shrink, then remove the instruction. 219f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trickvoid LiveRangeEdit::eliminateDeadDef(MachineInstr *MI, ToShrinkSet &ToShrink) { 220f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick assert(MI->allDefsAreDead() && "Def isn't really dead"); 221f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick SlotIndex Idx = LIS.getInstructionIndex(MI).getRegSlot(); 2225881799d0cccbd814ec1b0f0509df9be1f63c6cbJakob Stoklund Olesen 223529616299f109f58e2a8217a1a760ba961266459Andrew Trick // Never delete a bundled instruction. 224529616299f109f58e2a8217a1a760ba961266459Andrew Trick if (MI->isBundled()) { 225529616299f109f58e2a8217a1a760ba961266459Andrew Trick return; 226529616299f109f58e2a8217a1a760ba961266459Andrew Trick } 227f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // Never delete inline asm. 228f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick if (MI->isInlineAsm()) { 229f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick DEBUG(dbgs() << "Won't delete: " << Idx << '\t' << *MI); 230f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick return; 231f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick } 2325881799d0cccbd814ec1b0f0509df9be1f63c6cbJakob Stoklund Olesen 233f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // Use the same criteria as DeadMachineInstructionElim. 234f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick bool SawStore = false; 235f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick if (!MI->isSafeToMove(&TII, 0, SawStore)) { 236f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick DEBUG(dbgs() << "Can't delete: " << Idx << '\t' << *MI); 237f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick return; 238f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick } 2395881799d0cccbd814ec1b0f0509df9be1f63c6cbJakob Stoklund Olesen 240f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick DEBUG(dbgs() << "Deleting dead def " << Idx << '\t' << *MI); 241f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick 242f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // Collect virtual registers to be erased after MI is gone. 243f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick SmallVector<unsigned, 8> RegsToErase; 244f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick bool ReadsPhysRegs = false; 2455881799d0cccbd814ec1b0f0509df9be1f63c6cbJakob Stoklund Olesen 246f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // Check for live intervals that may shrink 247f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick for (MachineInstr::mop_iterator MOI = MI->operands_begin(), 248f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick MOE = MI->operands_end(); MOI != MOE; ++MOI) { 249f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick if (!MOI->isReg()) 250f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick continue; 251f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick unsigned Reg = MOI->getReg(); 252f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick if (!TargetRegisterInfo::isVirtualRegister(Reg)) { 253f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // Check if MI reads any unreserved physregs. 254f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick if (Reg && MOI->readsReg() && !MRI.isReserved(Reg)) 255f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick ReadsPhysRegs = true; 25603dca5e4b6c41e1e7fa4edad3d7ff8d5f6de7008Andrew Trick else if (MOI->isDef()) { 25703dca5e4b6c41e1e7fa4edad3d7ff8d5f6de7008Andrew Trick for (MCRegUnitIterator Units(Reg, MRI.getTargetRegisterInfo()); 25803dca5e4b6c41e1e7fa4edad3d7ff8d5f6de7008Andrew Trick Units.isValid(); ++Units) { 25903dca5e4b6c41e1e7fa4edad3d7ff8d5f6de7008Andrew Trick if (LiveInterval *LI = LIS.getCachedRegUnit(*Units)) { 26003dca5e4b6c41e1e7fa4edad3d7ff8d5f6de7008Andrew Trick if (VNInfo *VNI = LI->getVNInfoAt(Idx)) 26103dca5e4b6c41e1e7fa4edad3d7ff8d5f6de7008Andrew Trick LI->removeValNo(VNI); 26203dca5e4b6c41e1e7fa4edad3d7ff8d5f6de7008Andrew Trick } 26303dca5e4b6c41e1e7fa4edad3d7ff8d5f6de7008Andrew Trick } 26403dca5e4b6c41e1e7fa4edad3d7ff8d5f6de7008Andrew Trick } 265f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick continue; 266f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick } 267f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick LiveInterval &LI = LIS.getInterval(Reg); 268f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick 269f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // Shrink read registers, unless it is likely to be expensive and 270f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // unlikely to change anything. We typically don't want to shrink the 271f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // PIC base register that has lots of uses everywhere. 272f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // Always shrink COPY uses that probably come from live range splitting. 273f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick if (MI->readsVirtualRegister(Reg) && 274f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick (MI->isCopy() || MOI->isDef() || MRI.hasOneNonDBGUse(Reg) || 275f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick LI.killedAt(Idx))) 276f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick ToShrink.insert(&LI); 277f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick 278f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // Remove defined value. 279f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick if (MOI->isDef()) { 280f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick if (VNInfo *VNI = LI.getVNInfoAt(Idx)) { 281e2b83ab056836067e2c86ef22223a4c29fe267ceJakob Stoklund Olesen if (TheDelegate) 282f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick TheDelegate->LRE_WillShrinkVirtReg(LI.reg); 283f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick LI.removeValNo(VNI); 284f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick if (LI.empty()) 285f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick RegsToErase.push_back(Reg); 286e2b83ab056836067e2c86ef22223a4c29fe267ceJakob Stoklund Olesen } 287f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick } 288f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick } 28976ff7418361c1c80ce9d018bce63511a70bd7390Jakob Stoklund Olesen 290f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // Currently, we don't support DCE of physreg live ranges. If MI reads 291f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // any unreserved physregs, don't erase the instruction, but turn it into 292f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // a KILL instead. This way, the physreg live ranges don't end up 293f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // dangling. 294f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // FIXME: It would be better to have something like shrinkToUses() for 295f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // physregs. That could potentially enable more DCE and it would free up 296f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // the physreg. It would not happen often, though. 297f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick if (ReadsPhysRegs) { 298f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick MI->setDesc(TII.get(TargetOpcode::KILL)); 299f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // Remove all operands that aren't physregs. 300f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick for (unsigned i = MI->getNumOperands(); i; --i) { 301f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick const MachineOperand &MO = MI->getOperand(i-1); 302f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick if (MO.isReg() && TargetRegisterInfo::isPhysicalRegister(MO.getReg())) 303f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick continue; 304f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick MI->RemoveOperand(i-1); 305f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick } 306f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick DEBUG(dbgs() << "Converted physregs to:\t" << *MI); 307f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick } else { 308f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick if (TheDelegate) 309f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick TheDelegate->LRE_WillEraseInstruction(MI); 310f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick LIS.RemoveMachineInstrFromMaps(MI); 311f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick MI->eraseFromParent(); 312f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick ++NumDCEDeleted; 313f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick } 314f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick 315f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // Erase any virtregs that are now empty and unused. There may be <undef> 316f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // uses around. Keep the empty live range in that case. 317f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick for (unsigned i = 0, e = RegsToErase.size(); i != e; ++i) { 318f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick unsigned Reg = RegsToErase[i]; 319f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick if (LIS.hasInterval(Reg) && MRI.reg_nodbg_empty(Reg)) { 320f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick ToShrink.remove(&LIS.getInterval(Reg)); 321f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick eraseVirtReg(Reg); 3225881799d0cccbd814ec1b0f0509df9be1f63c6cbJakob Stoklund Olesen } 323f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick } 324f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick} 325f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick 326f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trickvoid LiveRangeEdit::eliminateDeadDefs(SmallVectorImpl<MachineInstr*> &Dead, 327f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick ArrayRef<unsigned> RegsBeingSpilled) { 328f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick ToShrinkSet ToShrink; 329f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick 330f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick for (;;) { 331f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick // Erase all dead defs. 332f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick while (!Dead.empty()) 333f1f99f394f367845c4f4528d4d2bce42e65a5f50Andrew Trick eliminateDeadDef(Dead.pop_back_val(), ToShrink); 3345881799d0cccbd814ec1b0f0509df9be1f63c6cbJakob Stoklund Olesen 3355881799d0cccbd814ec1b0f0509df9be1f63c6cbJakob Stoklund Olesen if (ToShrink.empty()) 3365881799d0cccbd814ec1b0f0509df9be1f63c6cbJakob Stoklund Olesen break; 3375881799d0cccbd814ec1b0f0509df9be1f63c6cbJakob Stoklund Olesen 3385881799d0cccbd814ec1b0f0509df9be1f63c6cbJakob Stoklund Olesen // Shrink just one live interval. Then delete new dead defs. 3391d5b84508173b93faf513032b3847152e6060791Jakob Stoklund Olesen LiveInterval *LI = ToShrink.back(); 3405881799d0cccbd814ec1b0f0509df9be1f63c6cbJakob Stoklund Olesen ToShrink.pop_back(); 3418a06af96698537377275dd7848db69915638dd26Pete Cooper if (foldAsLoad(LI, Dead)) 3423520019931c2bad615c35edcb943cd1e8582ebacJakob Stoklund Olesen continue; 343c696c8bd35a8ab293879e821142dd9136201f16eJakob Stoklund Olesen if (TheDelegate) 344c696c8bd35a8ab293879e821142dd9136201f16eJakob Stoklund Olesen TheDelegate->LRE_WillShrinkVirtReg(LI->reg); 3456a3dbd3b25bbc99bd1a233d6a74ddea3493ba6acJakob Stoklund Olesen if (!LIS.shrinkToUses(LI, &Dead)) 3466a3dbd3b25bbc99bd1a233d6a74ddea3493ba6acJakob Stoklund Olesen continue; 347005622ffae7e6386c27a65a8789bb8d0d773f5d8Andrew Trick 3484777ebb767d1b590c05d502c4a7f6adef4e6d5d1Pete Cooper // Don't create new intervals for a register being spilled. 3494777ebb767d1b590c05d502c4a7f6adef4e6d5d1Pete Cooper // The new intervals would have to be spilled anyway so its not worth it. 3504777ebb767d1b590c05d502c4a7f6adef4e6d5d1Pete Cooper // Also they currently aren't spilled so creating them and not spilling 3514777ebb767d1b590c05d502c4a7f6adef4e6d5d1Pete Cooper // them results in incorrect code. 3524777ebb767d1b590c05d502c4a7f6adef4e6d5d1Pete Cooper bool BeingSpilled = false; 3534777ebb767d1b590c05d502c4a7f6adef4e6d5d1Pete Cooper for (unsigned i = 0, e = RegsBeingSpilled.size(); i != e; ++i) { 3544777ebb767d1b590c05d502c4a7f6adef4e6d5d1Pete Cooper if (LI->reg == RegsBeingSpilled[i]) { 3554777ebb767d1b590c05d502c4a7f6adef4e6d5d1Pete Cooper BeingSpilled = true; 3564777ebb767d1b590c05d502c4a7f6adef4e6d5d1Pete Cooper break; 3574777ebb767d1b590c05d502c4a7f6adef4e6d5d1Pete Cooper } 3584777ebb767d1b590c05d502c4a7f6adef4e6d5d1Pete Cooper } 359005622ffae7e6386c27a65a8789bb8d0d773f5d8Andrew Trick 3604777ebb767d1b590c05d502c4a7f6adef4e6d5d1Pete Cooper if (BeingSpilled) continue; 3616a3dbd3b25bbc99bd1a233d6a74ddea3493ba6acJakob Stoklund Olesen 3626a3dbd3b25bbc99bd1a233d6a74ddea3493ba6acJakob Stoklund Olesen // LI may have been separated, create new intervals. 3636a3dbd3b25bbc99bd1a233d6a74ddea3493ba6acJakob Stoklund Olesen LI->RenumberValues(LIS); 3646a3dbd3b25bbc99bd1a233d6a74ddea3493ba6acJakob Stoklund Olesen ConnectedVNInfoEqClasses ConEQ(LIS); 3656a3dbd3b25bbc99bd1a233d6a74ddea3493ba6acJakob Stoklund Olesen unsigned NumComp = ConEQ.Classify(LI); 3666a3dbd3b25bbc99bd1a233d6a74ddea3493ba6acJakob Stoklund Olesen if (NumComp <= 1) 3676a3dbd3b25bbc99bd1a233d6a74ddea3493ba6acJakob Stoklund Olesen continue; 368e9bd4ea5fda4957c373a3bbc14803d9670041dccJakob Stoklund Olesen ++NumFracRanges; 3692e267ae7b8caf7192a3793eb3b78937ff83f794dPete Cooper bool IsOriginal = VRM && VRM->getOriginal(LI->reg) == LI->reg; 3706a3dbd3b25bbc99bd1a233d6a74ddea3493ba6acJakob Stoklund Olesen DEBUG(dbgs() << NumComp << " components: " << *LI << '\n'); 3716a3dbd3b25bbc99bd1a233d6a74ddea3493ba6acJakob Stoklund Olesen SmallVector<LiveInterval*, 8> Dups(1, LI); 372f22ca3fe5f0cfbb832cf41270f97cf5c0134fd7bJakob Stoklund Olesen for (unsigned i = 1; i != NumComp; ++i) { 3738a06af96698537377275dd7848db69915638dd26Pete Cooper Dups.push_back(&createFrom(LI->reg)); 3749693d4c3f0d0e8c91e4748eb1c18799b1de7551cJakob Stoklund Olesen // If LI is an original interval that hasn't been split yet, make the new 3759693d4c3f0d0e8c91e4748eb1c18799b1de7551cJakob Stoklund Olesen // intervals their own originals instead of referring to LI. The original 3769693d4c3f0d0e8c91e4748eb1c18799b1de7551cJakob Stoklund Olesen // interval must contain all the split products, and LI doesn't. 3779693d4c3f0d0e8c91e4748eb1c18799b1de7551cJakob Stoklund Olesen if (IsOriginal) 3788a06af96698537377275dd7848db69915638dd26Pete Cooper VRM->setIsSplitFromReg(Dups.back()->reg, 0); 379c696c8bd35a8ab293879e821142dd9136201f16eJakob Stoklund Olesen if (TheDelegate) 380c696c8bd35a8ab293879e821142dd9136201f16eJakob Stoklund Olesen TheDelegate->LRE_DidCloneVirtReg(Dups.back()->reg, LI->reg); 381f22ca3fe5f0cfbb832cf41270f97cf5c0134fd7bJakob Stoklund Olesen } 3821edc3cf65d54130542fc91bac67ecf616ef88d48Jakob Stoklund Olesen ConEQ.Distribute(&Dups[0], MRI); 3837ebed91fddbcd259d03c4b438719ac1ce2a4fc87Jakob Stoklund Olesen DEBUG({ 3847ebed91fddbcd259d03c4b438719ac1ce2a4fc87Jakob Stoklund Olesen for (unsigned i = 0; i != NumComp; ++i) 3857ebed91fddbcd259d03c4b438719ac1ce2a4fc87Jakob Stoklund Olesen dbgs() << '\t' << *Dups[i] << '\n'; 3867ebed91fddbcd259d03c4b438719ac1ce2a4fc87Jakob Stoklund Olesen }); 3875881799d0cccbd814ec1b0f0509df9be1f63c6cbJakob Stoklund Olesen } 3885881799d0cccbd814ec1b0f0509df9be1f63c6cbJakob Stoklund Olesen} 3895881799d0cccbd814ec1b0f0509df9be1f63c6cbJakob Stoklund Olesen 3904eed756153b84c211114a3e9186bf0cb55d4b394Benjamin Kramervoid 3914eed756153b84c211114a3e9186bf0cb55d4b394Benjamin KramerLiveRangeEdit::calculateRegClassAndHint(MachineFunction &MF, 3924eed756153b84c211114a3e9186bf0cb55d4b394Benjamin Kramer const MachineLoopInfo &Loops, 3934eed756153b84c211114a3e9186bf0cb55d4b394Benjamin Kramer const MachineBlockFrequencyInfo &MBFI) { 3944eed756153b84c211114a3e9186bf0cb55d4b394Benjamin Kramer VirtRegAuxInfo VRAI(MF, LIS, Loops, MBFI); 3956094bd87d845afabba5b99ec4848fa6116bac682Jakob Stoklund Olesen for (iterator I = begin(), E = end(); I != E; ++I) { 3966094bd87d845afabba5b99ec4848fa6116bac682Jakob Stoklund Olesen LiveInterval &LI = **I; 3976d1fd0b979cb88809ebb77a24f4da69e1d67606bJakob Stoklund Olesen if (MRI.recomputeRegClass(LI.reg, MF.getTarget())) 3986d1fd0b979cb88809ebb77a24f4da69e1d67606bJakob Stoklund Olesen DEBUG(dbgs() << "Inflated " << PrintReg(LI.reg) << " to " 3996d1fd0b979cb88809ebb77a24f4da69e1d67606bJakob Stoklund Olesen << MRI.getRegClass(LI.reg)->getName() << '\n'); 4006094bd87d845afabba5b99ec4848fa6116bac682Jakob Stoklund Olesen VRAI.CalculateWeightAndHint(LI); 4016094bd87d845afabba5b99ec4848fa6116bac682Jakob Stoklund Olesen } 4026094bd87d845afabba5b99ec4848fa6116bac682Jakob Stoklund Olesen} 403