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| author | Duncan Sands <baldrick@free.fr> | 2011-03-08 12:39:03 +0000 |
|---|---|---|
| committer | Duncan Sands <baldrick@free.fr> | 2011-03-08 12:39:03 +0000 |
| commit | 7dc3d47c349d9cd40dd837b86b52ddf6625a108c (patch) | |
| tree | a5c0625f5db516b861f8c17658892189992e114c /llvm/lib/Analysis/ValueTracking.cpp | |
| parent | b5545be14bde81af3d9ff9e441ef0b148122a91b (diff) | |
| download | llvm-7dc3d47c349d9cd40dd837b86b52ddf6625a108c.zip llvm-7dc3d47c349d9cd40dd837b86b52ddf6625a108c.tar.gz llvm-7dc3d47c349d9cd40dd837b86b52ddf6625a108c.tar.bz2 | |
Fix PR9331. Simplified version of a patch by Jakub Staszak.
llvm-svn: 127243
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 231b95b..f05ad66 100644 --- a/llvm/lib/Analysis/ValueTracking.cpp +++ b/llvm/lib/Analysis/ValueTracking.cpp @@ -610,6 +610,10 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask, // 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) { + // Skip if every incoming value references to ourself. + if (P->hasConstantValue() == P) + break; + KnownZero = APInt::getAllOnesValue(BitWidth); KnownOne = APInt::getAllOnesValue(BitWidth); for (unsigned i = 0, e = P->getNumIncomingValues(); i != e; ++i) { |