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[PowerPC][NFC] Refactor splat of constant to vector.

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Refactor the splatting of a constant to a vector so that common code is used
both for Power9 and Power8.

Patch by: Anil Mahmud

Differential Revision: https://reviews.llvm.org/D71481
This commit is contained in:
Stefan Pintilie 2019-12-18 12:19:04 -06:00
parent a85f5efd95
commit ec3d6f3ecb
1 changed files with 4 additions and 25 deletions
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29
llvm/lib/Target/PowerPC/PPCISelLowering.cpp
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@ -8319,8 +8319,6 @@ SDValue PPCTargetLowering::LowerSRA_PARTS(SDValue Op, SelectionDAG &DAG) const {
/// SplatSize. Cast the result to VT.
static SDValue BuildSplatI(int Val, unsigned SplatSize, EVT VT,
SelectionDAG &DAG, const SDLoc &dl) {
assert(Val >= -16 && Val <= 15 && "vsplti is out of range!");
static const MVT VTys[] = { // canonical VT to use for each size.
MVT::v16i8, MVT::v8i16, MVT::Other, MVT::v4i32
};
@ -8640,29 +8638,10 @@ SDValue PPCTargetLowering::LowerBUILD_VECTOR(SDValue Op,
}
// We have XXSPLTIB for constant splats one byte wide
if (Subtarget.hasP9Vector() && SplatSize == 1) {
// This is a splat of 1-byte elements with some elements potentially undef.
// Rather than trying to match undef in the SDAG patterns, ensure that all
// elements are the same constant.
if (HasAnyUndefs || ISD::isBuildVectorAllOnes(BVN)) {
SmallVector<SDValue, 16> Ops(16, DAG.getConstant(SplatBits,
dl, MVT::i32));
SDValue NewBV = DAG.getBuildVector(MVT::v16i8, dl, Ops);
if (Op.getValueType() != MVT::v16i8)
return DAG.getBitcast(Op.getValueType(), NewBV);
return NewBV;
}
// BuildVectorSDNode::isConstantSplat() is actually pretty smart. It'll
// detect that constant splats like v8i16: 0xABAB are really just splats
// of a 1-byte constant. In this case, we need to convert the node to a
// splat of v16i8 and a bitcast.
if (Op.getValueType() != MVT::v16i8)
return DAG.getBitcast(Op.getValueType(),
DAG.getConstant(SplatBits, dl, MVT::v16i8));
return Op;
}
// FIXME: SplatBits is an unsigned int being cast to an int while passing it
// as an argument to BuildSplatiI. Given SplatSize == 1 it is okay here.
if (Subtarget.hasP9Vector() && SplatSize == 1)
return BuildSplatI(SplatBits, SplatSize, Op.getValueType(), DAG, dl);
// If the sign extended value is in the range [-16,15], use VSPLTI[bhw].
int32_t SextVal= (int32_t(SplatBits << (32-SplatBitSize)) >>