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| author | Dan Gohman <gohman@apple.com> | 2009-09-27 15:37:03 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-09-27 15:37:03 +0000 |
| commit | fc20b67e80157635fa99b00e8d0cd63a9e57fdd5 (patch) | |
| tree | a1396d3821d07c61b9aa2177ba06d34d970562b8 /llvm/lib/Transforms/Scalar/LoopRotation.cpp | |
| parent | 4338f905b79bf996bfa10ba515f915e2986bcccb (diff) | |
| download | bcm5719-llvm-fc20b67e80157635fa99b00e8d0cd63a9e57fdd5.tar.gz bcm5719-llvm-fc20b67e80157635fa99b00e8d0cd63a9e57fdd5.zip | |
Tell ScalarEvolution to forget everything it knows about a loop before
rotating the loop, since loop rotation is a very significant change.
llvm-svn: 82901
Diffstat (limited to 'llvm/lib/Transforms/Scalar/LoopRotation.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/LoopRotation.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Scalar/LoopRotation.cpp b/llvm/lib/Transforms/Scalar/LoopRotation.cpp index 34ba48c6b05..70c69bb1dae 100644 --- a/llvm/lib/Transforms/Scalar/LoopRotation.cpp +++ b/llvm/lib/Transforms/Scalar/LoopRotation.cpp @@ -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. |
