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| author | Chris Lattner <sabre@nondot.org> | 2011-04-09 07:25:58 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2011-04-09 07:25:58 +0000 |
| commit | f5bf464b701908d16f7cee0bbf2b8c8df4f3a917 (patch) | |
| tree | 779548dfee216513ce90ab3ddb941d71402f762e /lib/Transforms/Scalar/LoopRotation.cpp | |
| parent | 0403b473dd99b5c7db1fa7048288be6cb42e7abd (diff) | |
| download | llvm-f5bf464b701908d16f7cee0bbf2b8c8df4f3a917.tar.gz llvm-f5bf464b701908d16f7cee0bbf2b8c8df4f3a917.tar.bz2 llvm-f5bf464b701908d16f7cee0bbf2b8c8df4f3a917.tar.xz | |
fix PR9523, a crash in looprotate on a non-canonical loop made out of indirectbr.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129203 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Scalar/LoopRotation.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/LoopRotation.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/LoopRotation.cpp b/lib/Transforms/Scalar/LoopRotation.cpp index 95e15784df..e7b1a031f8 100644 --- a/lib/Transforms/Scalar/LoopRotation.cpp +++ b/lib/Transforms/Scalar/LoopRotation.cpp @@ -184,7 +184,11 @@ bool LoopRotate::rotateLoop(Loop *L) { // Now, this loop is suitable for rotation. BasicBlock *OrigPreheader = L->getLoopPreheader(); BasicBlock *OrigLatch = L->getLoopLatch(); - assert(OrigPreheader && OrigLatch && "Loop not in canonical form?"); + + // If the loop could not be converted to canonical form, it must have an + // indirectbr in it, just give up. + if (OrigPreheader == 0 || OrigLatch == 0) + return false; // Anything ScalarEvolution may know about this loop or the PHI nodes // in its header will soon be invalidated. |