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[X86][AVX512BW] AVX512BW can sign-extend v32i8 to v32i16 for simpler v32i8 multiplies. 

Only pre-AVX512BW targets need to split v32i8 vectors.

llvm-svn: 264509
This commit is contained in:
Simon Pilgrim 2016-03-26 09:44:27 +00:00
parent b549ab02b4
commit 7379a70677
2 changed files with 10 additions and 20 deletions
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5
llvm/lib/Target/X86/X86ISelLowering.cpp
View File

@ -18910,8 +18910,9 @@ static SDValue LowerMUL(SDValue Op, const X86Subtarget &Subtarget,
if (VT == MVT::v16i8 || VT == MVT::v32i8) {
if (Subtarget.hasInt256()) {
// For 256-bit vectors, split into 128-bit vectors to allow the
// sign-extension to occur.
if (VT == MVT::v32i8)
// sign-extension to occur. We don't need this on AVX512BW as we can
// safely sign-extend to v32i16.
if (VT == MVT::v32i8 && !Subtarget.hasBWI())
return Lower256IntArith(Op, DAG);
MVT ExVT = MVT::getVectorVT(MVT::i16, VT.getVectorNumElements());

25
llvm/test/CodeGen/X86/pmul.ll
View File

@ -473,15 +473,11 @@ define <32 x i8> @mul_v32i8c(<32 x i8> %i) nounwind {
;
; AVX512BW-LABEL: mul_v32i8c:
; AVX512BW: # BB#0: # %entry
; AVX512BW-NEXT: vpmovsxbw %xmm0, %ymm1
; AVX512BW-NEXT: vpmovsxbw {{.*}}(%rip), %ymm2
; AVX512BW-NEXT: vpmullw %ymm2, %ymm1, %ymm1
; AVX512BW-NEXT: vpmovwb %zmm1, %ymm1
; AVX512BW-NEXT: vextracti128 $1, %ymm0, %xmm0
; AVX512BW-NEXT: vpmovsxbw %xmm0, %ymm0
; AVX512BW-NEXT: vpmullw %ymm2, %ymm0, %ymm0
; AVX512BW-NEXT: vmovaps {{.*#+}} ymm1 = [117,117,117,117,117,117,117,117,117,117,117,117,117,117,117,117,117,117,117,117,117,117,117,117,117,117,117,117,117,117,117,117]
; AVX512BW-NEXT: vpmovsxbw %ymm1, %zmm1
; AVX512BW-NEXT: vpmovsxbw %ymm0, %zmm0
; AVX512BW-NEXT: vpmullw %zmm1, %zmm0, %zmm0
; AVX512BW-NEXT: vpmovwb %zmm0, %ymm0
; AVX512BW-NEXT: vinsertf128 $1, %xmm0, %ymm1, %ymm0
; AVX512BW-NEXT: retq
entry:
%A = mul <32 x i8> %i, < i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117, i8 117 >
@ -678,17 +674,10 @@ define <32 x i8> @mul_v32i8(<32 x i8> %i, <32 x i8> %j) nounwind {
;
; AVX512BW-LABEL: mul_v32i8:
; AVX512BW: # BB#0: # %entry
; AVX512BW-NEXT: vpmovsxbw %xmm1, %ymm2
; AVX512BW-NEXT: vpmovsxbw %xmm0, %ymm3
; AVX512BW-NEXT: vpmullw %ymm2, %ymm3, %ymm2
; AVX512BW-NEXT: vpmovwb %zmm2, %ymm2
; AVX512BW-NEXT: vextracti128 $1, %ymm1, %xmm1
; AVX512BW-NEXT: vpmovsxbw %xmm1, %ymm1
; AVX512BW-NEXT: vextracti128 $1, %ymm0, %xmm0
; AVX512BW-NEXT: vpmovsxbw %xmm0, %ymm0
; AVX512BW-NEXT: vpmullw %ymm1, %ymm0, %ymm0
; AVX512BW-NEXT: vpmovsxbw %ymm1, %zmm1
; AVX512BW-NEXT: vpmovsxbw %ymm0, %zmm0
; AVX512BW-NEXT: vpmullw %zmm1, %zmm0, %zmm0
; AVX512BW-NEXT: vpmovwb %zmm0, %ymm0
; AVX512BW-NEXT: vinsertf128 $1, %xmm0, %ymm2, %ymm0
; AVX512BW-NEXT: retq
entry:
%A = mul <32 x i8> %i, %j