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Fix for PR1279. Dead def has a live interval of length 1. Copy coalescing should

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not violate that.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35396 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-03-28 01:30:37 +00:00
parent 05c55ac0c1
commit d592a28ca1
1 changed files with 5 additions and 3 deletions
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8
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -935,9 +935,9 @@ bool LiveIntervals::JoinCopy(MachineInstr *CopyMI,
// The instruction which defines the src is only truly dead if there are // 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. // 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. // FIXME: find the last use, mark is kill and shorten the live range.
if (SrcEnd > getDefIndex(CopyIdx)) if (SrcEnd > getDefIndex(CopyIdx)) {
isDead = false; isDead = false;
else { } else {
MachineOperand *MOU; MachineOperand *MOU;
MachineInstr *LastUse= lastRegisterUse(repSrcReg, SrcStart, CopyIdx, MOU); MachineInstr *LastUse= lastRegisterUse(repSrcReg, SrcStart, CopyIdx, MOU);
if (LastUse) { if (LastUse) {
@ -947,7 +947,9 @@ bool LiveIntervals::JoinCopy(MachineInstr *CopyMI,
isShorten = true; isShorten = true;
RemoveStart = getDefIndex(getInstructionIndex(LastUse)); RemoveStart = getDefIndex(getInstructionIndex(LastUse));
RemoveEnd = SrcEnd; RemoveEnd = SrcEnd;
} } else if (RemoveStart > 0)
// A dead def should have a single cycle interval.
++RemoveStart;
} }
} }