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[X86][SSE] Move 2-input limit up from getFauxShuffleMask to resolveTargetShuffleInputs 

Makes no difference to actual shuffle decoding yet, but merges all the existing limits in one place for when proper support is fixed.

llvm-svn: 345395
This commit is contained in:
Simon Pilgrim 2018-10-26 15:19:02 +00:00
parent f4a6f6424d
commit 5d1be4f8d4
1 changed files with 2 additions and 6 deletions
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8
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -6325,9 +6325,6 @@ static bool getFauxShuffleMask(SDValue N, SmallVectorImpl<int> &Mask,
if (!resolveTargetShuffleInputs(N0, SrcInputs0, SrcMask0, DAG) ||
!resolveTargetShuffleInputs(N1, SrcInputs1, SrcMask1, DAG))
return false;
// TODO - Add support for more than 2 inputs.
if ((SrcInputs0.size() + SrcInputs1.size()) > 2)
return false;
int MaskSize = std::max(SrcMask0.size(), SrcMask1.size());
SmallVector<int, 64> Mask0, Mask1;
scaleShuffleMask<int>(MaskSize / SrcMask0.size(), SrcMask0, Mask0);
@ -6387,8 +6384,7 @@ static bool getFauxShuffleMask(SDValue N, SmallVectorImpl<int> &Mask,
Mask[i + InsertIdx] = (NumElts * (1 + InputIdx)) + ExtractIdx + M;
}
}
// TODO - Add support for more than 1 subinput.
return Ops.size() <= 2;
return true;
}
case ISD::SCALAR_TO_VECTOR: {
// Match against a scalar_to_vector of an extract from a vector,
@ -6581,7 +6577,7 @@ static bool resolveTargetShuffleInputs(SDValue Op,
return false;
resolveTargetShuffleInputsAndMask(Inputs, Mask);
return true;
return Inputs.size() <= 2;
}
/// Returns the scalar element that will make up the ith