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Fix IVUsers to avoid assuming that the loop has a unique backedge.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86161 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-11-05 19:41:37 +00:00
parent 6890584ab1
commit a6a4aaefee
1 changed files with 2 additions and 0 deletions
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lib/Analysis/IVUsers.cpp
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@ -151,6 +151,8 @@ static bool IVUseShouldUsePostIncValue(Instruction *User, Instruction *IV,
if (L->contains(User->getParent())) return false;
BasicBlock *LatchBlock = L->getLoopLatch();
if (!LatchBlock)
return false;
// Ok, the user is outside of the loop. If it is dominated by the latch
// block, use the post-inc value.