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[X86][SSE] Combine shuffles to MOVSS/MOVSD whatever the domain. 

We already do the same thing in shuffle lowering; but don't do it if we have SSE41 (PBLEND) instead.

llvm-svn: 289937
This commit is contained in:
Simon Pilgrim 2016-12-16 11:48:51 +00:00
parent a81719fbfc
commit f159a3414f
2 changed files with 11 additions and 15 deletions
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18
llvm/lib/Target/X86/X86ISelLowering.cpp
View File

@ -26072,17 +26072,17 @@ static bool matchBinaryVectorShuffle(MVT MaskVT, ArrayRef<int> Mask,
ShuffleVT = MVT::v4f32;
return true;
}
if (isTargetShuffleEquivalent(Mask, {0, 3}) && FloatDomain) {
if (Subtarget.hasSSE2()) {
std::swap(V1, V2);
Shuffle = X86ISD::MOVSD;
ShuffleVT = MVT::v2f64;
return true;
}
if (isTargetShuffleEquivalent(Mask, {0, 3}) && Subtarget.hasSSE2() &&
(FloatDomain || !Subtarget.hasSSE41())) {
std::swap(V1, V2);
Shuffle = X86ISD::MOVSD;
ShuffleVT = MaskVT;
return true;
}
if (isTargetShuffleEquivalent(Mask, {4, 1, 2, 3}) && FloatDomain) {
if (isTargetShuffleEquivalent(Mask, {4, 1, 2, 3}) &&
(FloatDomain || !Subtarget.hasSSE41())) {
Shuffle = X86ISD::MOVSS;
ShuffleVT = MVT::v4f32;
ShuffleVT = MaskVT;
return true;
}
}

8
llvm/test/CodeGen/X86/vector-shuffle-combining.ll
View File

@ -1804,9 +1804,7 @@ define <4 x float> @combine_test4b(<4 x float> %a, <4 x float> %b) {
define <4 x i8> @combine_test1c(<4 x i8>* %a, <4 x i8>* %b) {
; SSE2-LABEL: combine_test1c:
; SSE2: # BB#0:
; SSE2-NEXT: movd {{.*#+}} xmm1 = mem[0],zero,zero,zero
; SSE2-NEXT: punpcklbw {{.*#+}} xmm1 = xmm1[0],xmm0[0],xmm1[1],xmm0[1],xmm1[2],xmm0[2],xmm1[3],xmm0[3],xmm1[4],xmm0[4],xmm1[5],xmm0[5],xmm1[6],xmm0[6],xmm1[7],xmm0[7]
; SSE2-NEXT: punpcklwd {{.*#+}} xmm1 = xmm1[0],xmm0[0],xmm1[1],xmm0[1],xmm1[2],xmm0[2],xmm1[3],xmm0[3]
; SSE2-NEXT: movss {{.*#+}} xmm1 = mem[0],zero,zero,zero
; SSE2-NEXT: movd {{.*#+}} xmm0 = mem[0],zero,zero,zero
; SSE2-NEXT: punpcklbw {{.*#+}} xmm0 = xmm0[0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7]
; SSE2-NEXT: punpcklwd {{.*#+}} xmm0 = xmm0[0,0,1,1,2,2,3,3]
@ -1815,9 +1813,7 @@ define <4 x i8> @combine_test1c(<4 x i8>* %a, <4 x i8>* %b) {
;
; SSSE3-LABEL: combine_test1c:
; SSSE3: # BB#0:
; SSSE3-NEXT: movd {{.*#+}} xmm1 = mem[0],zero,zero,zero
; SSSE3-NEXT: punpcklbw {{.*#+}} xmm1 = xmm1[0],xmm0[0],xmm1[1],xmm0[1],xmm1[2],xmm0[2],xmm1[3],xmm0[3],xmm1[4],xmm0[4],xmm1[5],xmm0[5],xmm1[6],xmm0[6],xmm1[7],xmm0[7]
; SSSE3-NEXT: punpcklwd {{.*#+}} xmm1 = xmm1[0],xmm0[0],xmm1[1],xmm0[1],xmm1[2],xmm0[2],xmm1[3],xmm0[3]
; SSSE3-NEXT: movss {{.*#+}} xmm1 = mem[0],zero,zero,zero
; SSSE3-NEXT: movd {{.*#+}} xmm0 = mem[0],zero,zero,zero
; SSSE3-NEXT: punpcklbw {{.*#+}} xmm0 = xmm0[0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7]
; SSSE3-NEXT: punpcklwd {{.*#+}} xmm0 = xmm0[0,0,1,1,2,2,3,3]