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[x86] add materializeVectorConstant() helper function; NFC

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LowerBUILD_VECTOR is still over 300 lines long, but it's a start...

llvm-svn: 258858
This commit is contained in:
Sanjay Patel 2016-01-26 21:05:00 +00:00
parent cf95660c3e
commit a30e120cbc
1 changed files with 34 additions and 20 deletions
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54
lib/Target/X86/X86ISelLowering.cpp
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@ -6389,6 +6389,38 @@ static SDValue LowerToHorizontalOp(const BuildVectorSDNode *BV,
return SDValue();
}
/// Create a vector constant without a load. SSE/AVX provide the bare minimum
/// functionality to do this, so it's all zeros, all ones, or some derivation
/// that is cheap to calculate.
static SDValue materializeVectorConstant(SDValue Op, SelectionDAG &DAG,
const X86Subtarget &Subtarget) {
SDLoc DL(Op);
MVT VT = Op.getSimpleValueType();
// Vectors containing all zeros can be matched by pxor and xorps.
if (ISD::isBuildVectorAllZeros(Op.getNode())) {
// Canonicalize this to <4 x i32> to 1) ensure the zero vectors are CSE'd
// and 2) ensure that i64 scalars are eliminated on x86-32 hosts.
if (VT == MVT::v4i32 || VT == MVT::v8i32 || VT == MVT::v16i32)
return Op;
return getZeroVector(VT, &Subtarget, DAG, DL);
}
// Vectors containing all ones can be matched by pcmpeqd on 128-bit width
// vectors or broken into v4i32 operations on 256-bit vectors. AVX2 can use
// vpcmpeqd on 256-bit vectors.
if (Subtarget.hasSSE2() && ISD::isBuildVectorAllOnes(Op.getNode())) {
if (VT == MVT::v4i32 || (VT == MVT::v8i32 && Subtarget.hasInt256()))
return Op;
if (!VT.is512BitVector())
return getOnesVector(VT, &Subtarget, DAG, DL);
}
return SDValue();
}
SDValue
X86TargetLowering::LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const {
SDLoc dl(Op);
@ -6401,26 +6433,8 @@ X86TargetLowering::LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const {
if (VT.getVectorElementType() == MVT::i1 && Subtarget->hasAVX512())
return LowerBUILD_VECTORvXi1(Op, DAG);
// Vectors containing all zeros can be matched by pxor and xorps later
if (ISD::isBuildVectorAllZeros(Op.getNode())) {
// Canonicalize this to <4 x i32> to 1) ensure the zero vectors are CSE'd
// and 2) ensure that i64 scalars are eliminated on x86-32 hosts.
if (VT == MVT::v4i32 || VT == MVT::v8i32 || VT == MVT::v16i32)
return Op;
return getZeroVector(VT, Subtarget, DAG, dl);
}
// Vectors containing all ones can be matched by pcmpeqd on 128-bit width
// vectors or broken into v4i32 operations on 256-bit vectors. AVX2 can use
// vpcmpeqd on 256-bit vectors.
if (Subtarget->hasSSE2() && ISD::isBuildVectorAllOnes(Op.getNode())) {
if (VT == MVT::v4i32 || (VT == MVT::v8i32 && Subtarget->hasInt256()))
return Op;
if (!VT.is512BitVector())
return getOnesVector(VT, Subtarget, DAG, dl);
}
if (SDValue VectorConstant = materializeVectorConstant(Op, DAG, *Subtarget))
return VectorConstant;
BuildVectorSDNode *BV = cast<BuildVectorSDNode>(Op.getNode());
if (SDValue AddSub = LowerToAddSub(BV, Subtarget, DAG))