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In some situations, we need to check for local interferences between the PHI

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node and its inputs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49070 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2008-04-02 03:00:13 +00:00
parent 59df878391
commit 52b1733df4
1 changed files with 11 additions and 2 deletions
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13
lib/CodeGen/StrongPHIElimination.cpp
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@ -483,8 +483,17 @@ void StrongPHIElimination::processBlock(MachineBasicBlock* MBB) {
std::vector<std::pair<unsigned, unsigned> > localInterferences; std::vector<std::pair<unsigned, unsigned> > localInterferences;
processPHIUnion(P, PHIUnion, DF, localInterferences); processPHIUnion(P, PHIUnion, DF, localInterferences);
// If one of the inputs is defined in the same block as the current PHI
// then we need to check for a local interference between that input and
// the PHI.
for (std::map<unsigned, unsigned>::iterator I = PHIUnion.begin(),
E = PHIUnion.end(); I != E; ++I)
if (MRI.getVRegDef(I->first)->getParent() == P->getParent())
localInterferences.push_back(std::make_pair(I->first,
P->getOperand(0).getReg()));
// The dominator forest walk may have returned some register pairs whose // The dominator forest walk may have returned some register pairs whose
// interference cannot be determines from dominator analysis. We now // interference cannot be determined from dominator analysis. We now
// examine these pairs for local interferences. // examine these pairs for local interferences.
for (std::vector<std::pair<unsigned, unsigned> >::iterator I = for (std::vector<std::pair<unsigned, unsigned> >::iterator I =
localInterferences.begin(), E = localInterferences.end(); I != E; ++I) { localInterferences.begin(), E = localInterferences.end(); I != E; ++I) {
@ -527,7 +536,7 @@ void StrongPHIElimination::processBlock(MachineBasicBlock* MBB) {
} }
} }
// Add the renaming set for this PHI node to our overal renaming information // Add the renaming set for this PHI node to our overall renaming information
RenameSets.insert(std::make_pair(P->getOperand(0).getReg(), PHIUnion)); RenameSets.insert(std::make_pair(P->getOperand(0).getReg(), PHIUnion));
// Remember which registers are already renamed, so that we don't try to // Remember which registers are already renamed, so that we don't try to