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[X86] Use PSHUFB for v32i16 shuffles before falling back to VPERMW/VPERMI2W.

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PSHUFB has the ability to implicitly 0 elements which VPERMI2W can't do. So give a chance to use it first.

llvm-svn: 321251
This commit is contained in:
Craig Topper 2017-12-21 08:22:51 +00:00
parent b98d778751
commit e1bff090c9
2 changed files with 19 additions and 0 deletions
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4
lib/Target/X86/X86ISelLowering.cpp
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@ -14080,6 +14080,10 @@ static SDValue lowerV32I16VectorShuffle(const SDLoc &DL, ArrayRef<int> Mask,
Zeroable, Subtarget, DAG)) Zeroable, Subtarget, DAG))
return Blend; return Blend;
if (SDValue PSHUFB = lowerVectorShuffleWithPSHUFB(
DL, MVT::v32i16, Mask, V1, V2, Zeroable, Subtarget, DAG))
return PSHUFB;
return lowerVectorShuffleWithPERMV(DL, MVT::v32i16, Mask, V1, V2, DAG); return lowerVectorShuffleWithPERMV(DL, MVT::v32i16, Mask, V1, V2, DAG);
} }

15
test/CodeGen/X86/vector-shuffle-512-v32.ll
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@ -353,3 +353,18 @@ define <8 x i16> @pr32967(<32 x i16> %v) {
%shuffle = shufflevector <32 x i16> %v, <32 x i16> undef, <8 x i32> <i32 1,i32 5,i32 9,i32 13,i32 17,i32 21,i32 25,i32 29> %shuffle = shufflevector <32 x i16> %v, <32 x i16> undef, <8 x i32> <i32 1,i32 5,i32 9,i32 13,i32 17,i32 21,i32 25,i32 29>
ret <8 x i16> %shuffle ret <8 x i16> %shuffle
} }
define <32 x i16> @shuffle_v32i16_07_zz_05_zz_03_zz_01_zz_15_zz_13_zz_11_zz_09_zz_23_zz_21_zz_19_zz_17_zz_31_zz_29_zz_27_zz_25_zz(<32 x i16> %a) {
; KNL-LABEL: shuffle_v32i16_07_zz_05_zz_03_zz_01_zz_15_zz_13_zz_11_zz_09_zz_23_zz_21_zz_19_zz_17_zz_31_zz_29_zz_27_zz_25_zz:
; KNL: ## %bb.0:
; KNL-NEXT: vpshufb {{.*#+}} ymm0 = ymm0[14,15],zero,zero,ymm0[10,11],zero,zero,ymm0[6,7],zero,zero,ymm0[2,3],zero,zero,ymm0[30,31],zero,zero,ymm0[26,27],zero,zero,ymm0[22,23],zero,zero,ymm0[18,19],zero,zero
; KNL-NEXT: vpshufb {{.*#+}} ymm1 = ymm1[14,15],zero,zero,ymm1[10,11],zero,zero,ymm1[6,7],zero,zero,ymm1[2,3],zero,zero,ymm1[30,31],zero,zero,ymm1[26,27],zero,zero,ymm1[22,23],zero,zero,ymm1[20,21],zero,zero
; KNL-NEXT: retq
;
; SKX-LABEL: shuffle_v32i16_07_zz_05_zz_03_zz_01_zz_15_zz_13_zz_11_zz_09_zz_23_zz_21_zz_19_zz_17_zz_31_zz_29_zz_27_zz_25_zz:
; SKX: ## %bb.0:
; SKX-NEXT: vpshufb {{.*#+}} zmm0 = zmm0[14,15],zero,zero,zmm0[10,11],zero,zero,zmm0[6,7],zero,zero,zmm0[2,3],zero,zero,zmm0[30,31],zero,zero,zmm0[26,27],zero,zero,zmm0[22,23],zero,zero,zmm0[18,19],zero,zero,zmm0[46,47],zero,zero,zmm0[42,43],zero,zero,zmm0[38,39],zero,zero,zmm0[34,35],zero,zero,zmm0[62,63],zero,zero,zmm0[58,59],zero,zero,zmm0[54,55],zero,zero,zmm0[52,53],zero,zero
; SKX-NEXT: retq
%shuffle = shufflevector <32 x i16> zeroinitializer, <32 x i16> %a, <32 x i32> <i32 39, i32 0, i32 37, i32 0, i32 35, i32 0, i32 33, i32 0, i32 47, i32 0, i32 45, i32 0, i32 43, i32 0, i32 41, i32 0, i32 55, i32 0, i32 53, i32 0, i32 51, i32 0, i32 49, i32 0, i32 63, i32 0, i32 61, i32 0, i32 59, i32 0, i32 58, i32 0>
ret <32 x i16> %shuffle
}