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Tell ScalarEvolution to forget everything it knows about a loop before

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rotating the loop, since loop rotation is a very significant change.

llvm-svn: 82901
This commit is contained in:
Dan Gohman 2009-09-27 15:37:03 +00:00
parent eb9dbb2bd2
commit fa43cefae4
1 changed files with 5 additions and 0 deletions
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5
lib/Transforms/Scalar/LoopRotation.cpp
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@ -177,6 +177,11 @@ bool LoopRotate::rotateLoop(Loop *Lp, LPPassManager &LPM) {
// Now, this loop is suitable for rotation.
// Anything ScalarEvolution may know about this loop or the PHI nodes
// in its header will soon be invalidated.
if (ScalarEvolution *SE = getAnalysisIfAvailable<ScalarEvolution>())
SE->forgetLoopBackedgeTakenCount(L);
// Find new Loop header. NewHeader is a Header's one and only successor
// that is inside loop. Header's other successor is outside the
// loop. Otherwise loop is not suitable for rotation.