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[X86] Add support for lowering v4i64 and v8i64 shuffles directly to PALIGNR. I think shuffle combine can figure it out later, but we should try to get it right up front. 

llvm-svn: 284914
This commit is contained in:
Craig Topper 2016-10-22 06:51:52 +00:00
parent 9f374533e3
commit 7b2b8db438
1 changed files with 8 additions and 0 deletions
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8
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -11450,6 +11450,10 @@ static SDValue lowerV4I64VectorShuffle(const SDLoc &DL, ArrayRef<int> Mask,
Subtarget, DAG))
return Shift;
if (SDValue Rotate = lowerVectorShuffleAsByteRotate(DL, MVT::v4i64, V1, V2,
Mask, Subtarget, DAG))
return Rotate;
// Use dedicated unpack instructions for masks that match their pattern.
if (SDValue V =
lowerVectorShuffleWithUNPCK(DL, MVT::v4i64, Mask, V1, V2, DAG))
@ -12028,6 +12032,10 @@ static SDValue lowerV8I64VectorShuffle(const SDLoc &DL, ArrayRef<int> Mask,
Subtarget, DAG))
return Shift;
if (SDValue Rotate = lowerVectorShuffleAsByteRotate(DL, MVT::v8i64, V1, V2,
Mask, Subtarget, DAG))
return Rotate;
if (SDValue Unpck =
lowerVectorShuffleWithUNPCK(DL, MVT::v8i64, Mask, V1, V2, DAG))
return Unpck;