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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 | 606199fb85d1c8407615e575b5e8bb5c71be27bd (patch) | |
| tree | 54f37c7c89cf76912f9dc229854ca77ca4bed090 /lib | |
| parent | c61ac5120ddb5b58693aff42d43cc8e23b7bd0c2 (diff) | |
| download | external_llvm-606199fb85d1c8407615e575b5e8bb5c71be27bd.zip external_llvm-606199fb85d1c8407615e575b5e8bb5c71be27bd.tar.gz external_llvm-606199fb85d1c8407615e575b5e8bb5c71be27bd.tar.bz2 | |
Fix PR9331. Simplified version of a patch by Jakub Staszak.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127243 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Analysis/ValueTracking.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/Analysis/ValueTracking.cpp b/lib/Analysis/ValueTracking.cpp index 231b95b..f05ad66 100644 --- a/lib/Analysis/ValueTracking.cpp +++ b/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) { |