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Revert r139782, "RemoveCopyByCommutingDef doesn't need hasPHIKill()."

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It does, after all.

RemoveCopyByCommutingDef rewrites the uses of one particular value
number in A. It doesn't know how to rewrite phi uses, so there can't be
any.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139787 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-09-15 06:27:32 +00:00
parent 75c63087b4
commit 9b82d50d20
1 changed files with 8 additions and 8 deletions
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16
lib/CodeGen/RegisterCoalescer.cpp
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@ -566,16 +566,14 @@ bool RegisterCoalescer::AdjustCopiesBackFrom(const CoalescerPair &CP,
}
/// HasOtherReachingDefs - Return true if there are definitions of IntB
/// other than BValNo val# that can reach uses of AValno val# of IntA, or any
/// of its phis.
/// other than BValNo val# that can reach uses of AValno val# of IntA.
bool RegisterCoalescer::HasOtherReachingDefs(LiveInterval &IntA,
LiveInterval &IntB,
VNInfo *AValNo,
VNInfo *BValNo) {
LiveInterval &IntB,
VNInfo *AValNo,
VNInfo *BValNo) {
for (LiveInterval::iterator AI = IntA.begin(), AE = IntA.end();
AI != AE; ++AI) {
if (AI->valno != AValNo && !AI->valno->isPHIDef())
continue;
if (AI->valno != AValNo) continue;
LiveInterval::Ranges::iterator BI =
std::upper_bound(IntB.ranges.begin(), IntB.ranges.end(), AI->start);
if (BI != IntB.ranges.begin())
@ -647,7 +645,9 @@ bool RegisterCoalescer::RemoveCopyByCommutingDef(const CoalescerPair &CP,
VNInfo *AValNo = IntA.getVNInfoAt(CopyIdx.getUseIndex());
assert(AValNo && "COPY source not live");
if (AValNo->isPHIDef() || AValNo->isUnused())
// If other defs can reach uses of this def, then it's not safe to perform
// the optimization.
if (AValNo->isPHIDef() || AValNo->isUnused() || AValNo->hasPHIKill())
return false;
MachineInstr *DefMI = LIS->getInstructionFromIndex(AValNo->def);
if (!DefMI)