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When merging a PHI operand's live interval into the PHI's live interval, we need to merge over all liveranges in

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the operand's interval that share the relevant value number, not just the range that immediately precedes the PHI.

llvm-svn: 54174
This commit is contained in:
Owen Anderson 2008-07-29 21:17:08 +00:00
parent bebb8e5d20
commit ab575176fc
1 changed files with 16 additions and 8 deletions
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24
lib/CodeGen/StrongPHIElimination.cpp
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@ -786,21 +786,29 @@ void StrongPHIElimination::mergeLiveIntervals(unsigned primary,
LiveInterval& RHS = LI.getOrCreateInterval(secondary);
LI.computeNumbering();
const LiveRange* RangeMergingIn =
RHS.getLiveRangeContaining(LI.getMBBEndIdx(pred));
VNInfo* RHSVN = RangeMergingIn->valno;
VNInfo* NewVN = LHS.getNextValue(RangeMergingIn->valno->def,
RangeMergingIn->valno->copy,
LI.getVNInfoAllocator());
NewVN->hasPHIKill = true;
LiveRange NewRange(RangeMergingIn->start, RangeMergingIn->end, NewVN);
for (LiveInterval::iterator RI = RHS.begin(), RE = RHS.end();
RI != RE; )
if (RI->valno == RHSVN) {
NewVN->hasPHIKill = true;
LiveRange NewRange(RI->start, RI->end, NewVN);
LHS.addRange(NewRange);
unsigned start = RI->start;
unsigned end = RI->end;
++RI;
RHS.removeRange(start, end, true);
} else
++RI;
if (RHS.containsOneValue())
if (RHS.begin() == RHS.end())
LI.removeInterval(RHS.reg);
else
RHS.removeRange(RangeMergingIn->start, RangeMergingIn->end, true);
LHS.addRange(NewRange);
}
bool StrongPHIElimination::runOnMachineFunction(MachineFunction &Fn) {