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| author | Nick Lewycky <nicholas@mxc.ca> | 2011-02-10 23:54:10 +0000 |
|---|---|---|
| committer | Nick Lewycky <nicholas@mxc.ca> | 2011-02-10 23:54:10 +0000 |
| commit | ac0b62c27730ca7eb6ca49363298fdceeb3e7032 (patch) | |
| tree | 479f05a123f0fe344e7d16fb2215a7c561500b9a /llvm/lib/Analysis/ValueTracking.cpp | |
| parent | 97dae4d361b96e10ff450c0dccab48d2bccb5685 (diff) | |
| download | llvm-ac0b62c27730ca7eb6ca49363298fdceeb3e7032.zip llvm-ac0b62c27730ca7eb6ca49363298fdceeb3e7032.tar.gz llvm-ac0b62c27730ca7eb6ca49363298fdceeb3e7032.tar.bz2 | |
Tolerate degenerate phi nodes that can occur in the middle of optimization
passes. Fixes PR9112. Patch by Jakub Staszak!
llvm-svn: 125319
Diffstat (limited to 'llvm/lib/Analysis/ValueTracking.cpp')
| -rw-r--r-- | llvm/lib/Analysis/ValueTracking.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp index 44c1b53..32d2c88 100644 --- a/llvm/lib/Analysis/ValueTracking.cpp +++ b/llvm/lib/Analysis/ValueTracking.cpp @@ -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) { |