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Fix a bug in the local allocator's liveness computation where it

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was setting kill flags on tied uses in two-address instructions.
The kill flags were causing the allocator to think it could
allocate the use and its tied def in different registers.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57039 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2008-10-04 00:31:14 +00:00
parent 880ae364ba
commit 022b21ff7c
2 changed files with 36 additions and 3 deletions
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8
lib/CodeGen/RegAllocLocal.cpp
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@ -651,9 +651,11 @@ void RALocal::ComputeLocalLiveness(MachineBasicBlock& MBB) {
// Physical registers and those that are not live-out of the block
// are killed/dead at their last use/def within this block.
if (isPhysReg || !usedOutsideBlock) {
if (MO.isUse())
MO.setIsKill(true);
else
if (MO.isUse()) {
// Don't mark uses that are tied to defs as kills.
if (MI->getDesc().getOperandConstraint(idx, TOI::TIED_TO) == -1)
MO.setIsKill(true);
} else
MO.setIsDead(true);
}
}