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[X86][SSE] combineX86ShufflesRecursively - begin generalizing the number of shuffle inputs. NFCI. 

We currently bail if the target shuffle decodes to more than 2 input vectors, this is some initial cleanup that still has the limit but generalizes the opindices to an array that will be necessary when we drop the limit.

llvm-svn: 354489
This commit is contained in:
Simon Pilgrim 2019-02-20 17:58:29 +00:00
parent 4e9b02b0da
commit dca47c659c
1 changed files with 7 additions and 11 deletions
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18
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -31712,15 +31712,10 @@ static SDValue combineX86ShufflesRecursively(
if (2 < OpInputs.size())
return SDValue();
SDValue Input0 = (OpInputs.size() > 0 ? OpInputs[0] : SDValue());
SDValue Input1 = (OpInputs.size() > 1 ? OpInputs[1] : SDValue());
// Add the inputs to the Ops list, avoiding duplicates.
SmallVector<SDValue, 16> Ops(SrcOps.begin(), SrcOps.end());
auto AddOp = [&Ops](SDValue Input, int InsertionPoint) -> int {
if (!Input)
return -1;
// Attempt to find an existing match.
SDValue InputBC = peekThroughBitcasts(Input);
for (int i = 0, e = Ops.size(); i < e; ++i)
@ -31736,8 +31731,9 @@ static SDValue combineX86ShufflesRecursively(
return Ops.size() - 1;
};
int InputIdx0 = AddOp(Input0, SrcOpIndex);
int InputIdx1 = AddOp(Input1, -1);
SmallVector<int, 2> OpInputIdx;
for (SDValue OpInput : OpInputs)
OpInputIdx.push_back(AddOp(OpInput, OpInputIdx.empty() ? SrcOpIndex : -1));
assert(((RootMask.size() > OpMask.size() &&
RootMask.size() % OpMask.size() == 0) ||
@ -31810,11 +31806,11 @@ static SDValue combineX86ShufflesRecursively(
OpMaskedIdx = OpMaskedIdx & (MaskWidth - 1);
if (OpMask[OpIdx] < (int)OpMask.size()) {
assert(0 <= InputIdx0 && "Unknown target shuffle input");
OpMaskedIdx += InputIdx0 * MaskWidth;
assert(0 <= OpInputIdx[0] && "Unknown target shuffle input");
OpMaskedIdx += OpInputIdx[0] * MaskWidth;
} else {
assert(0 <= InputIdx1 && "Unknown target shuffle input");
OpMaskedIdx += InputIdx1 * MaskWidth;
assert(0 <= OpInputIdx[1] && "Unknown target shuffle input");
OpMaskedIdx += OpInputIdx[1] * MaskWidth;
}
Mask[i] = OpMaskedIdx;