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Remember to update live-in lists when coalescing physregs.

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Patch by M Wahab!

llvm-svn: 95668
This commit is contained in:
Jakob Stoklund Olesen 2010-02-09 17:20:11 +00:00
parent 2a84a7ccbd
commit 70aa88d977
1 changed files with 17 additions and 0 deletions
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17
lib/CodeGen/SimpleRegisterCoalescing.cpp
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@ -1755,6 +1755,23 @@ bool SimpleRegisterCoalescing::JoinCopy(CopyRec &TheCopy, bool &Again) {
UpdateRegDefsUses(SrcReg, DstReg, SubIdx);
// If we have extended the live range of a physical register, make sure we
// update live-in lists as well.
if (TargetRegisterInfo::isPhysicalRegister(DstReg)) {
const LiveInterval &VRegInterval = li_->getInterval(SrcReg);
SmallVector<MachineBasicBlock*, 16> BlockSeq;
for (LiveInterval::const_iterator I = VRegInterval.begin(),
E = VRegInterval.end(); I != E; ++I ) {
li_->findLiveInMBBs(I->start, I->end, BlockSeq);
for (unsigned idx = 0, size = BlockSeq.size(); idx != size; ++idx) {
MachineBasicBlock &block = *BlockSeq[idx];
if (!block.isLiveIn(DstReg))
block.addLiveIn(DstReg);
}
BlockSeq.clear();
}
}
// SrcReg is guarateed to be the register whose live interval that is
// being merged.
li_->removeInterval(SrcReg);