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[x86] Refactor some of the new code for lowering v16i8 shuffles to

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remove duplication and make it easier to select different strategies.

No functionality changed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212674 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2014-07-10 02:24:26 +00:00
parent 706cbb3337
commit c4788790f6
1 changed files with 17 additions and 17 deletions
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34
lib/Target/X86/X86ISelLowering.cpp
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@ -7792,19 +7792,6 @@ static SDValue lowerV16I8VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
return DAG.getNode(X86ISD::UNPCKL, DL, MVT::v16i8, Evens, Odds);
}
SDValue Zero = getZeroVector(MVT::v8i16, Subtarget, DAG, DL);
SDValue LoV1 =
DAG.getNode(ISD::BITCAST, DL, MVT::v8i16,
DAG.getNode(X86ISD::UNPCKL, DL, MVT::v16i8, V1, Zero));
SDValue HiV1 =
DAG.getNode(ISD::BITCAST, DL, MVT::v8i16,
DAG.getNode(X86ISD::UNPCKH, DL, MVT::v16i8, V1, Zero));
SDValue LoV2 =
DAG.getNode(ISD::BITCAST, DL, MVT::v8i16,
DAG.getNode(X86ISD::UNPCKL, DL, MVT::v16i8, V2, Zero));
SDValue HiV2 =
DAG.getNode(ISD::BITCAST, DL, MVT::v8i16,
DAG.getNode(X86ISD::UNPCKH, DL, MVT::v16i8, V2, Zero));
int V1LoBlendMask[8] = {-1, -1, -1, -1, -1, -1, -1, -1};
int V1HiBlendMask[8] = {-1, -1, -1, -1, -1, -1, -1, -1};
@ -7826,10 +7813,23 @@ static SDValue lowerV16I8VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
buildBlendMasks(LoMask, V1LoBlendMask, V2LoBlendMask);
buildBlendMasks(HiMask, V1HiBlendMask, V2HiBlendMask);
SDValue V1Lo = DAG.getVectorShuffle(MVT::v8i16, DL, LoV1, HiV1, V1LoBlendMask);
SDValue V2Lo = DAG.getVectorShuffle(MVT::v8i16, DL, LoV2, HiV2, V2LoBlendMask);
SDValue V1Hi = DAG.getVectorShuffle(MVT::v8i16, DL, LoV1, HiV1, V1HiBlendMask);
SDValue V2Hi = DAG.getVectorShuffle(MVT::v8i16, DL, LoV2, HiV2, V2HiBlendMask);
SDValue Zero = getZeroVector(MVT::v8i16, Subtarget, DAG, DL);
auto buildLoAndHiV8s =
[&](SDValue V, ArrayRef<int> LoBlendMask, ArrayRef<int> HiBlendMask) {
SDValue LoV =
DAG.getNode(ISD::BITCAST, DL, MVT::v8i16,
DAG.getNode(X86ISD::UNPCKL, DL, MVT::v16i8, V, Zero));
SDValue HiV =
DAG.getNode(ISD::BITCAST, DL, MVT::v8i16,
DAG.getNode(X86ISD::UNPCKH, DL, MVT::v16i8, V, Zero));
SDValue BlendedLo = DAG.getVectorShuffle(MVT::v8i16, DL, LoV, HiV, LoBlendMask);
SDValue BlendedHi = DAG.getVectorShuffle(MVT::v8i16, DL, LoV, HiV, HiBlendMask);
return std::make_pair(BlendedLo, BlendedHi);
};
SDValue V1Lo, V1Hi, V2Lo, V2Hi;
std::tie(V1Lo, V1Hi) = buildLoAndHiV8s(V1, V1LoBlendMask, V1HiBlendMask);
std::tie(V2Lo, V2Hi) = buildLoAndHiV8s(V2, V2LoBlendMask, V2HiBlendMask);
SDValue LoV = DAG.getVectorShuffle(MVT::v8i16, DL, V1Lo, V2Lo, LoMask);
SDValue HiV = DAG.getVectorShuffle(MVT::v8i16, DL, V1Hi, V2Hi, HiMask);