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[x86] simplify getOnesVector() ; NFCI

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Let DAG.getConstant() handle the splatting; there's no need
to repeat that logic here.

llvm-svn: 258833
This commit is contained in:
Sanjay Patel 2016-01-26 18:49:36 +00:00
parent 966902f532
commit d7994b665a
1 changed files with 11 additions and 20 deletions
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31
lib/Target/X86/X86ISelLowering.cpp
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@ -4754,31 +4754,22 @@ static SDValue Concat256BitVectors(SDValue V1, SDValue V2, EVT VT,
/// Returns a vector of specified type with all bits set.
/// Always build ones vectors as <4 x i32> or <8 x i32>. For 256-bit types with
/// no AVX2 supprt, use two <4 x i32> inserted in a <8 x i32> appropriately.
/// no AVX2 support, use two <4 x i32> inserted in a <8 x i32> appropriately.
/// Then bitcast to their original type, ensuring they get CSE'd.
static SDValue getOnesVector(EVT VT, const X86Subtarget *Subtarget,
SelectionDAG &DAG, SDLoc dl) {
assert(VT.isVector() && "Expected a vector type");
assert((VT.is128BitVector() || VT.is256BitVector() || VT.is512BitVector()) &&
"Expected a 128/256/512-bit vector type");
SDValue Cst = DAG.getConstant(~0U, dl, MVT::i32);
APInt Ones = APInt::getAllOnesValue(32);
unsigned NumElts = VT.getSizeInBits() / 32;
SDValue Vec;
if (VT.is512BitVector()) {
SDValue Ops[] = { Cst, Cst, Cst, Cst, Cst, Cst, Cst, Cst,
Cst, Cst, Cst, Cst, Cst, Cst, Cst, Cst };
Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v16i32, Ops);
} else if (VT.is256BitVector()) {
if (Subtarget->hasInt256()) { // AVX2
SDValue Ops[] = { Cst, Cst, Cst, Cst, Cst, Cst, Cst, Cst };
Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v8i32, Ops);
} else { // AVX
Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4i32, Cst, Cst, Cst, Cst);
Vec = Concat128BitVectors(Vec, Vec, MVT::v8i32, 8, DAG, dl);
}
} else if (VT.is128BitVector()) {
Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4i32, Cst, Cst, Cst, Cst);
} else
llvm_unreachable("Unexpected vector type");
if (!Subtarget->hasInt256() && NumElts == 8) {
Vec = DAG.getConstant(Ones, dl, MVT::v4i32);
Vec = Concat128BitVectors(Vec, Vec, MVT::v8i32, 8, DAG, dl);
} else {
Vec = DAG.getConstant(Ones, dl, MVT::getVectorVT(MVT::i32, NumElts));
}
return DAG.getBitcast(VT, Vec);
}