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Tolerate degenerate phi nodes that can occur in the middle of optimization

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passes. Fixes PR9112. Patch by Jakub Staszak!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125319 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2011-02-10 23:54:10 +00:00
parent 2c2b933037
commit 3b739d278c
2 changed files with 28 additions and 0 deletions
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4
lib/Analysis/ValueTracking.cpp
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@ -590,6 +590,10 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask,
}
}
// Unreachable blocks may have zero-operand PHI nodes.
if (P->getNumIncomingValues() == 0)
return;
// Otherwise take the unions of the known bit sets of the operands,
// taking conservative care to avoid excessive recursion.
if (Depth < MaxDepth - 1 && !KnownZero && !KnownOne) {