diff options
| 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 | e6fe67b2fb48b1f0f3c1ac8c1ce01e67c1f0bb1d (patch) | |
| tree | 4c32e5dc25d2c8e8ce5aca318f5c046757cab3f3 /lib | |
| parent | 6afea253e078357f7c306fa2b13151bbe24ae049 (diff) | |
| download | external_llvm-e6fe67b2fb48b1f0f3c1ac8c1ce01e67c1f0bb1d.zip external_llvm-e6fe67b2fb48b1f0f3c1ac8c1ce01e67c1f0bb1d.tar.gz external_llvm-e6fe67b2fb48b1f0f3c1ac8c1ce01e67c1f0bb1d.tar.bz2 | |
Tell ScalarEvolution to forget everything it knows about a loop before
rotating the loop, since loop rotation is a very significant change.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82901 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Transforms/Scalar/LoopRotation.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/LoopRotation.cpp b/lib/Transforms/Scalar/LoopRotation.cpp index 34ba48c..70c69bb 100644 --- a/lib/Transforms/Scalar/LoopRotation.cpp +++ b/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. |