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| author | Duncan Sands <baldrick@free.fr> | 2012-04-30 11:56:58 +0000 |
|---|---|---|
| committer | Duncan Sands <baldrick@free.fr> | 2012-04-30 11:56:58 +0000 |
| commit | 5ff30e70f8dc4ddfdb3bd6925ccdf524130a7b95 (patch) | |
| tree | f063cefea11403837e9ffc79cad33e8d7cbf9d14 /lib/Analysis/ValueTracking.cpp | |
| parent | bfbab99b58aa530d5d6aa886ef66be42a047c756 (diff) | |
| download | external_llvm-5ff30e70f8dc4ddfdb3bd6925ccdf524130a7b95.zip external_llvm-5ff30e70f8dc4ddfdb3bd6925ccdf524130a7b95.tar.gz external_llvm-5ff30e70f8dc4ddfdb3bd6925ccdf524130a7b95.tar.bz2 | |
Just mark the sign bit as known zero, rather than any other irrelevant bits
known zero in the LHS. Fixes PR12541.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155818 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis/ValueTracking.cpp')
| -rw-r--r-- | lib/Analysis/ValueTracking.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Analysis/ValueTracking.cpp b/lib/Analysis/ValueTracking.cpp index a430f62..1418e01 100644 --- a/lib/Analysis/ValueTracking.cpp +++ b/lib/Analysis/ValueTracking.cpp @@ -564,7 +564,7 @@ void llvm::ComputeMaskedBits(Value *V, APInt &KnownZero, APInt &KnownOne, Depth+1); // If it's known zero, our sign bit is also zero. if (LHSKnownZero.isNegative()) - KnownZero |= LHSKnownZero; + KnownZero.setBit(BitWidth - 1); } break; |