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[X86] Moved IsNOT helper earlier. NFCI. 

Makes it available for more combines to use without adding declarations.

llvm-svn: 367436
This commit is contained in:
Simon Pilgrim 2019-07-31 14:36:04 +00:00
parent c4fa139a5c
commit 0707f66ad0
1 changed files with 28 additions and 28 deletions
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56
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -5799,6 +5799,34 @@ static SDValue getExtendInVec(unsigned Opcode, const SDLoc &DL, EVT VT,
return DAG.getNode(Opcode, DL, VT, In);
}
// Match (xor X, -1) -> X.
// Match extract_subvector(xor X, -1) -> extract_subvector(X).
// Match concat_vectors(xor X, -1, xor Y, -1) -> concat_vectors(X, Y).
static SDValue IsNOT(SDValue V, SelectionDAG &DAG) {
V = peekThroughBitcasts(V);
if (V.getOpcode() == ISD::XOR &&
ISD::isBuildVectorAllOnes(V.getOperand(1).getNode()))
return V.getOperand(0);
if (V.getOpcode() == ISD::EXTRACT_SUBVECTOR &&
(isNullConstant(V.getOperand(1)) || V.getOperand(0).hasOneUse())) {
if (SDValue Not = IsNOT(V.getOperand(0), DAG)) {
Not = DAG.getBitcast(V.getOperand(0).getValueType(), Not);
return DAG.getNode(ISD::EXTRACT_SUBVECTOR, SDLoc(Not), V.getValueType(),
Not, V.getOperand(1));
}
}
SmallVector<SDValue, 2> CatOps;
if (collectConcatOps(V.getNode(), CatOps)) {
for (SDValue &CatOp : CatOps) {
SDValue NotCat = IsNOT(CatOp, DAG);
if (!NotCat) return SDValue();
CatOp = DAG.getBitcast(CatOp.getValueType(), NotCat);
}
return DAG.getNode(ISD::CONCAT_VECTORS, SDLoc(V), V.getValueType(), CatOps);
}
return SDValue();
}
/// Returns a vector_shuffle node for an unpackl operation.
static SDValue getUnpackl(SelectionDAG &DAG, const SDLoc &dl, MVT VT,
SDValue V1, SDValue V2) {
@ -38229,34 +38257,6 @@ static SDValue combineCompareEqual(SDNode *N, SelectionDAG &DAG,
return SDValue();
}
// Match (xor X, -1) -> X.
// Match extract_subvector(xor X, -1) -> extract_subvector(X).
// Match concat_vectors(xor X, -1, xor Y, -1) -> concat_vectors(X, Y).
static SDValue IsNOT(SDValue V, SelectionDAG &DAG) {
V = peekThroughBitcasts(V);
if (V.getOpcode() == ISD::XOR &&
ISD::isBuildVectorAllOnes(V.getOperand(1).getNode()))
return V.getOperand(0);
if (V.getOpcode() == ISD::EXTRACT_SUBVECTOR &&
(isNullConstant(V.getOperand(1)) || V.getOperand(0).hasOneUse())) {
if (SDValue Not = IsNOT(V.getOperand(0), DAG)) {
Not = DAG.getBitcast(V.getOperand(0).getValueType(), Not);
return DAG.getNode(ISD::EXTRACT_SUBVECTOR, SDLoc(Not), V.getValueType(),
Not, V.getOperand(1));
}
}
SmallVector<SDValue, 2> CatOps;
if (collectConcatOps(V.getNode(), CatOps)) {
for (SDValue &CatOp : CatOps) {
SDValue NotCat = IsNOT(CatOp, DAG);
if (!NotCat) return SDValue();
CatOp = DAG.getBitcast(CatOp.getValueType(), NotCat);
}
return DAG.getNode(ISD::CONCAT_VECTORS, SDLoc(V), V.getValueType(), CatOps);
}
return SDValue();
}
/// Try to fold: (and (xor X, -1), Y) -> (andnp X, Y).
static SDValue combineANDXORWithAllOnesIntoANDNP(SDNode *N, SelectionDAG &DAG) {
assert(N->getOpcode() == ISD::AND);