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Ugh, perform an optimization that GCC should be able to do itself. This

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speeds up livevar from .48/.32s -> .45/.31s in LLC on perlbmk

llvm-svn: 11217
This commit is contained in:
Chris Lattner 2004-02-09 01:43:23 +00:00
parent b665065e6d
commit 9fb6056f1f
1 changed files with 7 additions and 6 deletions
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13
lib/CodeGen/LiveVariables.cpp
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@ -146,14 +146,15 @@ void LiveVariables::HandlePhysRegDef(unsigned Reg, MachineInstr *MI) {
for (const unsigned *AliasSet = RegInfo->getAliasSet(Reg);
*AliasSet; ++AliasSet) {
if (MachineInstr *LastUse = PhysRegInfo[*AliasSet]) {
if (PhysRegUsed[*AliasSet])
RegistersKilled.insert(std::make_pair(LastUse, *AliasSet));
unsigned Alias = *AliasSet;
if (MachineInstr *LastUse = PhysRegInfo[Alias]) {
if (PhysRegUsed[Alias])
RegistersKilled.insert(std::make_pair(LastUse, Alias));
else
RegistersDead.insert(std::make_pair(LastUse, *AliasSet));
RegistersDead.insert(std::make_pair(LastUse, Alias));
}
PhysRegInfo[*AliasSet] = MI;
PhysRegUsed[*AliasSet] = false;
PhysRegInfo[Alias] = MI;
PhysRegUsed[Alias] = false;
}
}