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Recompute hasPHIKill flags when shrinking live intervals. 

PHI values may be deleted, causing the flags to be wrong. This fixes PR9616.

llvm-svn: 129092
This commit is contained in:
Jakob Stoklund Olesen 2011-04-07 18:43:14 +00:00
parent 4f3a28b387
commit 64beb47783
1 changed files with 3 additions and 1 deletions
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4
llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -787,6 +787,8 @@ bool LiveIntervals::shrinkToUses(LiveInterval *li,
VNInfo *VNI = *I;
if (VNI->isUnused())
continue;
// We may eliminate PHI values, so recompute PHIKill flags.
VNI->setHasPHIKill(false);
NewLI.addRange(LiveRange(VNI->def, VNI->def.getNextSlot(), VNI));
// A use tied to an early-clobber def ends at the load slot and isn't caught
@ -822,7 +824,7 @@ bool LiveIntervals::shrinkToUses(LiveInterval *li,
VNInfo *PVNI = li->getVNInfoAt(Stop);
// A predecessor is not required to have a live-out value for a PHI.
if (PVNI) {
assert(PVNI->hasPHIKill() && "Missing hasPHIKill flag");
PVNI->setHasPHIKill(true);
WorkList.push_back(std::make_pair(Stop, PVNI));
}
}