diff options
Diffstat (limited to 'lib/Transforms/Scalar/LoopRotation.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/LoopRotation.cpp | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/lib/Transforms/Scalar/LoopRotation.cpp b/lib/Transforms/Scalar/LoopRotation.cpp index 95e15784df2c..47dced37c3a4 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. @@ -322,7 +326,8 @@ bool LoopRotate::rotateLoop(Loop *L) { // We can fold the conditional branch in the preheader, this makes things // simpler. The first step is to remove the extra edge to the Exit block. Exit->removePredecessor(OrigPreheader, true /*preserve LCSSA*/); - BranchInst::Create(NewHeader, PHBI); + BranchInst *NewBI = BranchInst::Create(NewHeader, PHBI); + NewBI->setDebugLoc(PHBI->getDebugLoc()); PHBI->eraseFromParent(); // With our CFG finalized, update DomTree if it is available. |