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Fix Regression/Transforms/LoopUnswitch/2006-02-22-UnswitchCrash.ll, which

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caused SPASS to fail building last night.

We can't trivially unswitch a loop if the exit block has phi nodes in it,
because we don't know which predecessor to use.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26320 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-02-22 23:55:00 +00:00
parent 116ae7c067
commit f8bf116f80
1 changed files with 3 additions and 1 deletions
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4
lib/Transforms/Scalar/LoopUnswitch.cpp
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@ -325,7 +325,9 @@ static bool IsTrivialUnswitchCondition(Loop *L, Value *Cond, Constant **Val = 0,
}
}
if (!LoopExitBB)
// If we didn't find a single unique LoopExit block, or if the loop exit block
// contains phi nodes, this isn't trivial.
if (!LoopExitBB || isa<PHINode>(LoopExitBB->begin()))
return false; // Can't handle this.
if (LoopExit) *LoopExit = LoopExitBB;