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Fix a bug that prevented PRE from applying in some cases.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55744 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2008-09-03 23:06:07 +00:00
parent 72ab076e67
commit 0c7f91cf84
1 changed files with 5 additions and 3 deletions
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8
lib/Transforms/Scalar/GVN.cpp
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@ -1131,9 +1131,11 @@ bool GVN::runOnFunction(Function& F) {
} }
if (EnablePRE) { if (EnablePRE) {
bool PREChanged = false; bool PREChanged = true;
while ((PREChanged = performPRE(F))) while (PREChanged) {
PREChanged = performPRE(F);
changed |= PREChanged; changed |= PREChanged;
}
} }
return changed; return changed;
@ -1256,7 +1258,7 @@ bool GVN::performPRE(Function& F) {
unsigned succNum = 0; unsigned succNum = 0;
for (unsigned i = 0, e = PREPred->getTerminator()->getNumSuccessors(); for (unsigned i = 0, e = PREPred->getTerminator()->getNumSuccessors();
i != e; ++i) i != e; ++i)
if (PREPred->getTerminator()->getSuccessor(i) == PREPred) { if (PREPred->getTerminator()->getSuccessor(i) == CurrentBlock) {
succNum = i; succNum = i;
break; break;
} }