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Revert rL345395: [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.
........
Its been reported that this is causing out of trunk failures.

llvm-svn: 345451
This commit is contained in:
Simon Pilgrim 2018-10-27 07:10:48 +00:00
parent 96f2ea3dd4
commit 88116e905e
1 changed files with 6 additions and 2 deletions
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8
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -6325,6 +6325,9 @@ 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);
@ -6384,7 +6387,8 @@ static bool getFauxShuffleMask(SDValue N, SmallVectorImpl<int> &Mask,
Mask[i + InsertIdx] = (NumElts * (1 + InputIdx)) + ExtractIdx + M;
}
}
return true;
// TODO - Add support for more than 1 subinput.
return Ops.size() <= 2;
}
case ISD::SCALAR_TO_VECTOR: {
// Match against a scalar_to_vector of an extract from a vector,
@ -6577,7 +6581,7 @@ static bool resolveTargetShuffleInputs(SDValue Op,
return false;
resolveTargetShuffleInputsAndMask(Inputs, Mask);
return Inputs.size() <= 2;
return true;
}
/// Returns the scalar element that will make up the ith