LiveInterval &IntB,
VNInfo *AValNo,
VNInfo *BValNo) {
+ // If AValNo has PHI kills, conservatively assume that IntB defs can reach
+ // the PHI values.
+ if (LIS->hasPHIKill(IntA, AValNo))
+ return true;
+
for (LiveInterval::iterator AI = IntA.begin(), AE = IntA.end();
AI != AE; ++AI) {
if (AI->valno != AValNo) continue;
// AValNo is the value number in A that defines the copy, A3 in the example.
VNInfo *AValNo = IntA.getVNInfoAt(CopyIdx.getRegSlot(true));
assert(AValNo && "COPY source not live");
-
- // 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())
+ if (AValNo->isPHIDef() || AValNo->isUnused())
return false;
MachineInstr *DefMI = LIS->getInstructionFromIndex(AValNo->def);
if (!DefMI)