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Fix a merge bug in preRAsched for handling physreg aliases. 

I've been sitting on this long enough trying to find a test case. I
think the fix should go in now, but I'll keep working on the test case.

llvm-svn: 132701
This commit is contained in:
Andrew Trick 2011-06-07 00:38:12 +00:00
parent ba8e18d9ae
commit 0af2e47310
1 changed files with 6 additions and 4 deletions
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10
llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
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@ -1008,14 +1008,16 @@ static void CheckForLiveRegDef(SUnit *SU, unsigned Reg,
for (const unsigned *AliasI = TRI->getOverlaps(Reg); *AliasI; ++AliasI) {
// Check if Ref is live.
if (!LiveRegDefs[Reg]) continue;
if (!LiveRegDefs[*AliasI]) continue;
// Allow multiple uses of the same def.
if (LiveRegDefs[Reg] == SU) continue;
if (LiveRegDefs[*AliasI] == SU) continue;
// Add Reg to the set of interfering live regs.
if (RegAdded.insert(Reg))
LRegs.push_back(Reg);
if (RegAdded.insert(*AliasI)) {
assert(*AliasI == Reg && "alias clobber"); //!!!
LRegs.push_back(*AliasI);
}
}
}