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break edges more intelligently 

llvm-svn: 31257
This commit is contained in:
Chris Lattner 2006-10-28 06:45:33 +00:00
parent 80ea207bfa
commit a6eb7e0803
1 changed files with 3 additions and 2 deletions
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5
llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -378,7 +378,8 @@ static bool IVUseShouldUsePostIncValue(Instruction *User, Instruction *IV,
// post-incremented value.
for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
if (PN->getIncomingValue(i) == IV) {
SplitCriticalEdge(PN->getIncomingBlock(i), PN->getParent(), P);
SplitCriticalEdge(PN->getIncomingBlock(i), PN->getParent(), P,
true);
// Splitting the critical edge can reduce the number of entries in this
// PHI.
e = PN->getNumIncomingValues();
@ -582,7 +583,7 @@ void BasedUser::RewriteInstructionToUseNewBase(const SCEVHandle &NewBase,
(PN->getParent() != L->getHeader() || !L->contains(PHIPred))) {
// First step, split the critical edge.
SplitCriticalEdge(PHIPred, PN->getParent(), P);
SplitCriticalEdge(PHIPred, PN->getParent(), P, true);
// Next step: move the basic block. In particular, if the PHI node
// is outside of the loop, and PredTI is in the loop, we want to