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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2012-09-21 17:27:23 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2012-09-21 17:27:23 +0000 |
| commit | 28aff84ceb2fcf0e4b05ed95b81e46fcd4cd373f (patch) | |
| tree | 940bcba6df7fb0e78b5162783505b07bb4828c7f /lib/Transforms | |
| parent | e5e674ba1191d9e9c528eb363babdcbea1359e10 (diff) | |
LoopIdiom: Give up when the loop is not in canonical form.
We rely on it when doing the transforms. This can happen when there is an
indirectbr in the loop.
Fixes PR13892.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164383 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms')
| -rw-r--r-- | lib/Transforms/Scalar/LoopIdiomRecognize.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/LoopIdiomRecognize.cpp b/lib/Transforms/Scalar/LoopIdiomRecognize.cpp index a72e288303..1553328c07 100644 --- a/lib/Transforms/Scalar/LoopIdiomRecognize.cpp +++ b/lib/Transforms/Scalar/LoopIdiomRecognize.cpp @@ -175,6 +175,11 @@ static void deleteIfDeadInstruction(Value *V, ScalarEvolution &SE, bool LoopIdiomRecognize::runOnLoop(Loop *L, LPPassManager &LPM) { CurLoop = L; + // If the loop could not be converted to canonical form, it must have an + // indirectbr in it, just give up. + if (!L->getLoopPreheader()) + return false; + // Disable loop idiom recognition if the function's name is a common idiom. StringRef Name = L->getHeader()->getParent()->getName(); if (Name == "memset" || Name == "memcpy") |