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[ValueTracking] Use APInt::sext instead of zext and setBitsFrom. NFC

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@300307 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper 2017-04-14 06:43:29 +00:00
parent d62c8b3151
commit 24f1072151
1 changed files with 2 additions and 7 deletions
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9
lib/Analysis/ValueTracking.cpp
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@ -1078,15 +1078,10 @@ static void computeKnownBitsFromOperator(const Operator *I, APInt &KnownZero,
KnownZero = KnownZero.trunc(SrcBitWidth);
KnownOne = KnownOne.trunc(SrcBitWidth);
computeKnownBits(I->getOperand(0), KnownZero, KnownOne, Depth + 1, Q);
KnownZero = KnownZero.zext(BitWidth);
KnownOne = KnownOne.zext(BitWidth);
// If the sign bit of the input is known set or clear, then we know the
// top bits of the result.
if (KnownZero[SrcBitWidth-1]) // Input sign bit known zero
KnownZero.setBitsFrom(SrcBitWidth);
else if (KnownOne[SrcBitWidth-1]) // Input sign bit known set
KnownOne.setBitsFrom(SrcBitWidth);
KnownZero = KnownZero.sext(BitWidth);
KnownOne = KnownOne.sext(BitWidth);
break;
}
case Instruction::Shl: {