Merging r182656:

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r182656 | d0k | 2013-05-24 11:05:35 -0700 (Fri, 24 May 2013) | 3 lines

LoopVectorize: LoopSimplify can't canonicalize loops with an indirectbr in it, don't assert on those cases.

Fixes PR16139.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_33@182785 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/Transforms/Vectorize/LoopVectorize.cpp b/lib/Transforms/Vectorize/LoopVectorize.cpp
index 4f6f51c9bb..bc420bd6a9 100644
--- a/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -2308,7 +2308,10 @@ bool LoopVectorizationLegality::canVectorizeWithIfConvert() {
 }
 
 bool LoopVectorizationLegality::canVectorize() {
-  assert(TheLoop->getLoopPreheader() && "No preheader!!");
+  // We must have a loop in canonical form. Loops with indirectbr in them cannot
+  // be canonicalized.
+  if (!TheLoop->getLoopPreheader())
+    return false;
 
   // We can only vectorize innermost loops.
   if (TheLoop->getSubLoopsVector().size())