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Make PRE actually handle critical edges (by splitting them). Confirmed that bootstrap passes with this change.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53762 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2008-07-18 18:03:38 +00:00
parent cfa94198d5
commit e98c54c47c
1 changed files with 6 additions and 3 deletions
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9
lib/Transforms/Scalar/GVN.cpp
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@ -1136,8 +1136,11 @@ bool GVN::runOnFunction(Function& F) {
changed |= shouldContinue; changed |= shouldContinue;
} }
if (EnablePRE) if (EnablePRE) {
changed |= performPRE(F); bool PREChanged = false;
while (PREChanged = performPRE(F))
changed |= PREChanged;
}
return changed; return changed;
} }
@ -1336,7 +1339,7 @@ bool GVN::performPRE(Function& F) {
I = toSplit.begin(), E = toSplit.end(); I != E; ++I) I = toSplit.begin(), E = toSplit.end(); I != E; ++I)
SplitCriticalEdge(I->first, I->second, this); SplitCriticalEdge(I->first, I->second, this);
return changed; return changed || toSplit.size();
} }
// iterateOnFunction - Executes one iteration of GVN // iterateOnFunction - Executes one iteration of GVN