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| author | Max Kazantsev <max.kazantsev@azul.com> | 2018-04-24 02:08:05 +0000 |
|---|---|---|
| committer | Max Kazantsev <max.kazantsev@azul.com> | 2018-04-24 02:08:05 +0000 |
| commit | 5a0a40b8cb9d82c9ff6202d17fdefd966f987aa9 (patch) | |
| tree | e0c118790eaffba93fac98be3dd766cee9ee4416 /llvm/lib/Transforms/Utils/LoopRotationUtils.cpp | |
| parent | 24004d65a5781a6519a01de545b7bd273065b140 (diff) | |
| download | llvm-5a0a40b8cb9d82c9ff6202d17fdefd966f987aa9.zip llvm-5a0a40b8cb9d82c9ff6202d17fdefd966f987aa9.tar.gz llvm-5a0a40b8cb9d82c9ff6202d17fdefd966f987aa9.tar.bz2 | |
[NFC] Add clarification comment
llvm-svn: 330677
Diffstat (limited to 'llvm/lib/Transforms/Utils/LoopRotationUtils.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Utils/LoopRotationUtils.cpp | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/llvm/lib/Transforms/Utils/LoopRotationUtils.cpp b/llvm/lib/Transforms/Utils/LoopRotationUtils.cpp index d2a2e40..a7dc34f 100644 --- a/llvm/lib/Transforms/Utils/LoopRotationUtils.cpp +++ b/llvm/lib/Transforms/Utils/LoopRotationUtils.cpp @@ -259,8 +259,10 @@ bool LoopRotate::rotateLoop(Loop *L, bool SimplifiedLatch) { return false; // Anything ScalarEvolution may know about this loop or the PHI nodes - // in its header will soon be invalidated, and it can also affect its parent - // loops as well. + // in its header will soon be invalidated. We should also invalidate + // all outer loops because insertion and deletion of blocks that happens + // during the rotation may violate invariants related to backedge taken + // infos in them. if (SE) SE->forgetTopmostLoop(L); |