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- More aggressively coalescing away copies whose source is defined by an implicit_def.

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- Added insert_subreg coalescing support.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49448 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2008-04-09 20:57:25 +00:00
parent 7d8143f0ef
commit 7e073baedb
6 changed files with 419 additions and 74 deletions
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lib/CodeGen/LiveIntervalAnalysis.cpp
+9 -2
View File
@@ -217,6 +217,7 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
MachineInstr *CopyMI = NULL;
unsigned SrcReg, DstReg;
if (mi->getOpcode() == TargetInstrInfo::EXTRACT_SUBREG ||
mi->getOpcode() == TargetInstrInfo::INSERT_SUBREG ||
tii_->isMoveInstr(*mi, SrcReg, DstReg))
CopyMI = mi;
ValNo = interval.getNextValue(defIndex, CopyMI, VNInfoAllocator);
@@ -372,6 +373,7 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
MachineInstr *CopyMI = NULL;
unsigned SrcReg, DstReg;
if (mi->getOpcode() == TargetInstrInfo::EXTRACT_SUBREG ||
mi->getOpcode() == TargetInstrInfo::INSERT_SUBREG ||
tii_->isMoveInstr(*mi, SrcReg, DstReg))
CopyMI = mi;
ValNo = interval.getNextValue(defIndex, CopyMI, VNInfoAllocator);
@@ -459,6 +461,7 @@ void LiveIntervals::handleRegisterDef(MachineBasicBlock *MBB,
MachineInstr *CopyMI = NULL;
unsigned SrcReg, DstReg;
if (MI->getOpcode() == TargetInstrInfo::EXTRACT_SUBREG ||
MI->getOpcode() == TargetInstrInfo::INSERT_SUBREG ||
tii_->isMoveInstr(*MI, SrcReg, DstReg))
CopyMI = MI;
handlePhysicalRegisterDef(MBB, MI, MIIdx, getOrCreateInterval(reg), CopyMI);
@@ -594,6 +597,8 @@ unsigned LiveIntervals::getVNInfoSourceReg(const VNInfo *VNI) const {
if (VNI->copy->getOpcode() == TargetInstrInfo::EXTRACT_SUBREG)
return VNI->copy->getOperand(1).getReg();
if (VNI->copy->getOpcode() == TargetInstrInfo::INSERT_SUBREG)
return VNI->copy->getOperand(2).getReg();
unsigned SrcReg, DstReg;
if (tii_->isMoveInstr(*VNI->copy, SrcReg, DstReg))
return SrcReg;
@@ -949,6 +954,8 @@ rewriteInstructionForSpills(const LiveInterval &li, const VNInfo *VNI,
HasUse = false;
HasDef = false;
CanFold = false;
if (isRemoved(MI))
break;
goto RestartInstruction;
}
} else {
@@ -1106,7 +1113,7 @@ rewriteInstructionsForSpills(const LiveInterval &li, bool TrySplit,
unsigned end = getBaseIndex(I->end-1) + InstrSlots::NUM;
// First collect all the def / use in this live range that will be rewritten.
// Make sure they are sorted according instruction index.
// Make sure they are sorted according to instruction index.
std::vector<RewriteInfo> RewriteMIs;
for (MachineRegisterInfo::reg_iterator ri = mri_->reg_begin(li.reg),
re = mri_->reg_end(); ri != re; ) {
@@ -1533,7 +1540,7 @@ addIntervalsForSpills(const LiveInterval &li,
}
}
// Else tell the spiller to issue a spill.
// Otherwise tell the spiller to issue a spill.
if (!Folded) {
LiveRange *LR = &nI.ranges[nI.ranges.size()-1];
bool isKill = LR->end == getStoreIndex(index);