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[ValueTracking] Use APInt::isSubsetOf and APInt::intersects. NFC 

llvm-svn: 301654
This commit is contained in:
Craig Topper 2017-04-28 16:57:55 +00:00
parent f7bd5ebd3b
commit 9eb2d72a1d
1 changed files with 2 additions and 2 deletions
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4
llvm/lib/Analysis/ValueTracking.cpp
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@ -1162,12 +1162,12 @@ static void computeKnownBitsFromOperator(const Operator *I, KnownBits &Known,
// If the first operand is non-negative or has all low bits zero, then
// the upper bits are all zero.
if (Known2.Zero.isSignBitSet() || ((Known2.Zero & LowBits) == LowBits))
if (Known2.Zero.isSignBitSet() || LowBits.isSubsetOf(Known2.Zero))
Known.Zero |= ~LowBits;
// If the first operand is negative and not all low bits are zero, then
// the upper bits are all one.
if (Known2.One.isSignBitSet() && ((Known2.One & LowBits) != 0))
if (Known2.One.isSignBitSet() && LowBits.intersects(Known2.One))
Known.One |= ~LowBits;
assert((Known.Zero & Known.One) == 0 && "Bits known to be one AND zero?");