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[X86][SSE] Use APInt::getBitsSet() instead of APInt::getLowBitsSet().shl() separately. NFCI. 

llvm-svn: 295845
This commit is contained in:
Simon Pilgrim 2017-02-22 15:04:55 +00:00
parent a6f369c727
commit 3a895c4873
2 changed files with 10 additions and 8 deletions
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7
llvm/lib/Target/X86/X86ISelLowering.cpp
View File

@ -5239,14 +5239,15 @@ static bool getTargetConstantBitsFromNode(SDValue Op, unsigned EltSizeInBits,
if (ISD::isBuildVectorOfConstantSDNodes(Op.getNode())) {
for (unsigned i = 0, e = Op.getNumOperands(); i != e; ++i) {
const SDValue &Src = Op.getOperand(i);
unsigned BitOffset = i * SrcEltSizeInBits;
if (Src.isUndef()) {
APInt Undefs = APInt::getLowBitsSet(SizeInBits, SrcEltSizeInBits);
UndefBits |= Undefs.shl(i * SrcEltSizeInBits);
unsigned HiBits = BitOffset + SrcEltSizeInBits;
UndefBits |= APInt::getBitsSet(SizeInBits, BitOffset, HiBits);
continue;
}
auto *Cst = cast<ConstantSDNode>(Src);
APInt Bits = Cst->getAPIntValue().zextOrTrunc(SrcEltSizeInBits);
MaskBits |= Bits.zext(SizeInBits).shl(i * SrcEltSizeInBits);
MaskBits |= Bits.zext(SizeInBits).shl(BitOffset);
}
return SplitBitData();
}

11
llvm/lib/Target/X86/X86ShuffleDecodeConstantPool.cpp
View File

@ -57,15 +57,16 @@ static bool extractConstantMask(const Constant *C, unsigned MaskEltSizeInBits,
if (!COp || (!isa<UndefValue>(COp) && !isa<ConstantInt>(COp)))
return false;
unsigned BitOffset = i * CstEltSizeInBits;
if (isa<UndefValue>(COp)) {
APInt EltUndef = APInt::getLowBitsSet(CstSizeInBits, CstEltSizeInBits);
UndefBits |= EltUndef.shl(i * CstEltSizeInBits);
unsigned HiBits = BitOffset + CstEltSizeInBits;
UndefBits |= APInt::getBitsSet(CstSizeInBits, BitOffset, HiBits);
continue;
}
APInt EltBits = cast<ConstantInt>(COp)->getValue();
EltBits = EltBits.zextOrTrunc(CstSizeInBits);
MaskBits |= EltBits.shl(i * CstEltSizeInBits);
auto *Elt = cast<ConstantInt>(COp);
MaskBits |= Elt->getValue().zextOrTrunc(CstSizeInBits).shl(BitOffset);
}
// Now extract the undef/constant bit data into the raw shuffle masks.