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Fix a couple of bugs related IsDead back propagation during coalescing.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34595 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-02-25 09:46:31 +00:00
parent 16191f0333
commit 48ef398ebd
1 changed files with 10 additions and 5 deletions
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15
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -903,11 +903,16 @@ bool LiveIntervals::JoinCopy(MachineInstr *CopyMI,
unsigned SrcStart = 0;
unsigned SrcEnd = 0;
if (isDead) {
unsigned CopyIdx = getDefIndex(getInstructionIndex(CopyMI));
LiveInterval::iterator SrcLR = SrcInt.FindLiveRangeContaining(CopyIdx-1);
unsigned CopyIdx = getInstructionIndex(CopyMI);
LiveInterval::iterator SrcLR =
SrcInt.FindLiveRangeContaining(getUseIndex(CopyIdx));
SrcStart = SrcLR->start;
SrcEnd = SrcLR->end;
if (hasRegisterUse(repSrcReg, SrcStart, SrcEnd))
// The instruction which defines the src is only truly dead if there are
// no intermediate uses and there isn't a use beyond the copy.
// FIXME: find the last use, mark is kill and shorten the live range.
if (SrcEnd > getDefIndex(CopyIdx) ||
hasRegisterUse(repSrcReg, SrcStart, CopyIdx))
isDead = false;
}
@ -918,10 +923,10 @@ bool LiveIntervals::JoinCopy(MachineInstr *CopyMI,
if (JoinIntervals(DestInt, SrcInt)) {
if (isDead) {
// Result of the copy is dead. Propagate this property.
if (SrcStart == 0) {
if (SrcStart == 0 && MRegisterInfo::isPhysicalRegister(SrcReg)) {
// Live-in to the function but dead. Remove it from MBB live-in set.
// JoinIntervals may end up swapping the two intervals.
LiveInterval &LiveInInt = (repSrcReg == DestInt.reg) ? DestInt:SrcInt;
LiveInterval &LiveInInt = (repSrcReg == DestInt.reg) ? DestInt : SrcInt;
LiveInInt.removeRange(SrcStart, SrcEnd);
MachineBasicBlock *MBB = CopyMI->getParent();
MBB->removeLiveIn(SrcReg);