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[x86] use getSignBit() for clarity; NFCI 

llvm-svn: 294333
This commit is contained in:
Sanjay Patel 2017-02-07 19:01:35 +00:00
parent 5602709b98
commit 633ecbf3c4
1 changed files with 3 additions and 4 deletions
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7
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -29477,8 +29477,8 @@ static SDValue combineSelect(SDNode *N, SelectionDAG &DAG,
// If this is a *dynamic* select (non-constant condition) and we can match
// this node with one of the variable blend instructions, restructure the
// condition so that the blends can use the high bit of each element and use
// SimplifyDemandedBits to simplify the condition operand.
// condition so that blends can use the high (sign) bit of each element and
// use SimplifyDemandedBits to simplify the condition operand.
if (N->getOpcode() == ISD::VSELECT && DCI.isBeforeLegalizeOps() &&
!DCI.isBeforeLegalize() &&
!ISD::isBuildVectorOfConstantSDNodes(Cond.getNode())) {
@ -29513,8 +29513,7 @@ static SDValue combineSelect(SDNode *N, SelectionDAG &DAG,
return SDValue();
assert(BitWidth >= 8 && BitWidth <= 64 && "Invalid mask size");
APInt DemandedMask = APInt::getHighBitsSet(BitWidth, 1);
APInt DemandedMask(APInt::getSignBit(BitWidth));
APInt KnownZero, KnownOne;
TargetLowering::TargetLoweringOpt TLO(DAG, DCI.isBeforeLegalize(),
DCI.isBeforeLegalizeOps());