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To find the exiting VN of a LiveInterval from a block, use the previous slot

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rather than the previous index. If a block has a single instruction, the
previous index may be in a different basic block.

I have no clue how this used to work on all of test-suite, because now this
failure is seen quite often when trying to compile code with -strong-phi-elim.
This fixes PR10252.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141812 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Cameron Zwarich 2011-10-12 21:24:54 +00:00
parent c66e7afcf2
commit 980df16920
1 changed files with 1 additions and 1 deletions
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2
lib/CodeGen/StrongPHIElimination.cpp
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@ -674,7 +674,7 @@ void StrongPHIElimination::InsertCopiesForPHI(MachineInstr *PHI,
if (PHIColor && SrcColor == PHIColor) {
LiveInterval &SrcInterval = LI->getInterval(SrcReg);
SlotIndex PredIndex = LI->getMBBEndIdx(PredBB);
VNInfo *SrcVNI = SrcInterval.getVNInfoAt(PredIndex.getPrevIndex());
VNInfo *SrcVNI = SrcInterval.getVNInfoAt(PredIndex.getPrevSlot());
assert(SrcVNI);
SrcVNI->setHasPHIKill(true);
continue;