diff options
Diffstat (limited to 'llvm/lib/Analysis')
| -rw-r--r-- | llvm/lib/Analysis/ValueTracking.cpp | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp index 80a08e2fdd0..f6e3886f652 100644 --- a/llvm/lib/Analysis/ValueTracking.cpp +++ b/llvm/lib/Analysis/ValueTracking.cpp @@ -1128,12 +1128,9 @@ static void computeKnownBitsFromOperator(const Operator *I, KnownBits &Known, Q.DL.getTypeSizeInBits(ScalarTy); assert(SrcBitWidth && "SrcBitWidth can't be zero"); - Known = Known.zextOrTrunc(SrcBitWidth); + Known = Known.zextOrTrunc(SrcBitWidth, false); computeKnownBits(I->getOperand(0), Known, Depth + 1, Q); - Known = Known.zextOrTrunc(BitWidth); - // Any top bits are known to be zero. - if (BitWidth > SrcBitWidth) - Known.Zero.setBitsFrom(SrcBitWidth); + Known = Known.zextOrTrunc(BitWidth, true /* ExtendedBitsAreKnownZero */); break; } case Instruction::BitCast: { |
