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LoopSimplify shouldn't split loop backedges that use indirectbr. PR7867.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111061 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-08-14 00:43:09 +00:00
parent e2c6d131d1
commit c2f40066bb
2 changed files with 40 additions and 0 deletions
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5
lib/Transforms/Utils/LoopSimplify.cpp
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@ -622,6 +622,11 @@ LoopSimplify::InsertUniqueBackedgeBlock(Loop *L, BasicBlock *Preheader) {
std::vector<BasicBlock*> BackedgeBlocks;
for (pred_iterator I = pred_begin(Header), E = pred_end(Header); I != E; ++I){
BasicBlock *P = *I;
// Indirectbr edges cannot be split, so we must fail if we find one.
if (isa<IndirectBrInst>(P->getTerminator()))
return 0;
if (P != Preheader) BackedgeBlocks.push_back(P);
}