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| author | dim <dim@FreeBSD.org> | 2011-06-12 15:42:51 +0000 |
|---|---|---|
| committer | dim <dim@FreeBSD.org> | 2011-06-12 15:42:51 +0000 |
| commit | ece02cd5829cea836e9365b0845a8ef042d17b0a (patch) | |
| tree | b3032e51d630e8070e9e08d6641648f195316a80 /lib/Analysis/ValueTracking.cpp | |
| parent | 2b066988909948dc3d53d01760bc2d71d32f3feb (diff) | |
| download | FreeBSD-src-ece02cd5829cea836e9365b0845a8ef042d17b0a.zip FreeBSD-src-ece02cd5829cea836e9365b0845a8ef042d17b0a.tar.gz | |
Vendor import of llvm trunk r132879:
http://llvm.org/svn/llvm-project/llvm/trunk@132879
Diffstat (limited to 'lib/Analysis/ValueTracking.cpp')
| -rw-r--r-- | lib/Analysis/ValueTracking.cpp | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/lib/Analysis/ValueTracking.cpp b/lib/Analysis/ValueTracking.cpp index 8f18dd2..dab5aeb 100644 --- a/lib/Analysis/ValueTracking.cpp +++ b/lib/Analysis/ValueTracking.cpp @@ -131,8 +131,18 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask, } return; } + + if (Argument *A = dyn_cast<Argument>(V)) { + // Get alignment information off byval arguments if specified in the IR. + if (A->hasByValAttr()) + if (unsigned Align = A->getParamAlignment()) + KnownZero = Mask & APInt::getLowBitsSet(BitWidth, + CountTrailingZeros_32(Align)); + return; + } - KnownZero.clearAllBits(); KnownOne.clearAllBits(); // Start out not knowing anything. + // Start out not knowing anything. + KnownZero.clearAllBits(); KnownOne.clearAllBits(); if (Depth == MaxDepth || Mask == 0) return; // Limit search depth. @@ -670,6 +680,10 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask, KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - LowBits); break; } + case Intrinsic::x86_sse42_crc32_64_8: + case Intrinsic::x86_sse42_crc32_64_64: + KnownZero = APInt::getHighBitsSet(64, 32); + break; } } break; |
