[x86] Teach the new shuffle lowering's blend functionality to use AVX2's
VPBLENDD where appropriate even on 128-bit vectors.
According to Agner's tables, this instruction is significantly higher
throughput (can execute on any port) on Haswell chips so we should
aggressively try to form it when available.
Sadly, this loses our delightful shuffle comments. I'll add those back
for VPBLENDD next.
llvm-svn: 218322
diff --git a/llvm/test/CodeGen/X86/vector-shuffle-256-v32.ll b/llvm/test/CodeGen/X86/vector-shuffle-256-v32.ll
index 9851e4d..5dec202 100644
--- a/llvm/test/CodeGen/X86/vector-shuffle-256-v32.ll
+++ b/llvm/test/CodeGen/X86/vector-shuffle-256-v32.ll
@@ -1138,11 +1138,11 @@
; AVX2-NEXT: vextracti128 $1, %ymm1, %xmm4
; AVX2-NEXT: vpunpcklbw {{.*}} # xmm4 = xmm4[0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7]
; AVX2-NEXT: vpshuflw {{.*}} # xmm4 = xmm4[0,0,0,0,4,5,6,7]
-; AVX2-NEXT: vpblendw {{.*}} # xmm2 = xmm4[0,1,2,3],xmm2[4,5,6,7]
+; AVX2-NEXT: vpblendd $-16, %xmm2, %xmm4, %xmm2
; AVX2-NEXT: vpshufb %xmm3, %xmm0, %xmm0
; AVX2-NEXT: vpunpcklbw {{.*}} # xmm1 = xmm1[0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7]
; AVX2-NEXT: vpshuflw {{.*}} # xmm1 = xmm1[0,0,0,0,4,5,6,7]
-; AVX2-NEXT: vpblendw {{.*}} # xmm0 = xmm1[0,1,2,3],xmm0[4,5,6,7]
+; AVX2-NEXT: vpblendd $-16, %xmm0, %xmm1, %xmm0
; AVX2-NEXT: vinserti128 $1, %xmm2, %ymm0, %ymm0
; AVX2-NEXT: retq
%shuffle = shufflevector <32 x i8> %a, <32 x i8> %b, <32 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 8, i32 8, i32 10, i32 10, i32 12, i32 12, i32 14, i32 14, i32 48, i32 48, i32 48, i32 48, i32 48, i32 48, i32 48, i32 48, i32 24, i32 24, i32 26, i32 26, i32 28, i32 28, i32 30, i32 30>
@@ -1173,10 +1173,10 @@
; AVX2-NEXT: vextracti128 $1, %ymm1, %xmm4
; AVX2-NEXT: vmovdqa .LCPI50_1(%rip), %xmm5
; AVX2-NEXT: vpshufb %xmm5, %xmm4, %xmm4
-; AVX2-NEXT: vpblendw {{.*}} # xmm2 = xmm4[0,1,2,3],xmm2[4,5,6,7]
+; AVX2-NEXT: vpblendd $-16, %xmm2, %xmm4, %xmm2
; AVX2-NEXT: vpshufb %xmm3, %xmm0, %xmm0
; AVX2-NEXT: vpshufb %xmm5, %xmm1, %xmm1
-; AVX2-NEXT: vpblendw {{.*}} # xmm0 = xmm1[0,1,2,3],xmm0[4,5,6,7]
+; AVX2-NEXT: vpblendd $-16, %xmm0, %xmm1, %xmm0
; AVX2-NEXT: vinserti128 $1, %xmm2, %ymm0, %ymm0
; AVX2-NEXT: retq
%shuffle = shufflevector <32 x i8> %a, <32 x i8> %b, <32 x i32> <i32 38, i32 38, i32 36, i32 36, i32 34, i32 34, i32 32, i32 32, i32 14, i32 14, i32 12, i32 12, i32 10, i32 10, i32 8, i32 8, i32 54, i32 54, i32 52, i32 52, i32 50, i32 50, i32 48, i32 48, i32 30, i32 30, i32 28, i32 28, i32 26, i32 26, i32 24, i32 24>
@@ -1207,10 +1207,10 @@
; AVX2-NEXT: vextracti128 $1, %ymm1, %xmm4
; AVX2-NEXT: vmovdqa .LCPI51_1(%rip), %xmm5
; AVX2-NEXT: vpshufb %xmm5, %xmm4, %xmm4
-; AVX2-NEXT: vpblendw {{.*}} # xmm2 = xmm4[0,1,2,3],xmm2[4,5,6,7]
+; AVX2-NEXT: vpblendd $-16, %xmm2, %xmm4, %xmm2
; AVX2-NEXT: vpshufb %xmm3, %xmm0, %xmm0
; AVX2-NEXT: vpshufb %xmm5, %xmm1, %xmm1
-; AVX2-NEXT: vpblendw {{.*}} # xmm0 = xmm1[0,1,2,3],xmm0[4,5,6,7]
+; AVX2-NEXT: vpblendd $-16, %xmm0, %xmm1, %xmm0
; AVX2-NEXT: vinserti128 $1, %xmm2, %ymm0, %ymm0
; AVX2-NEXT: retq
%shuffle = shufflevector <32 x i8> %a, <32 x i8> %b, <32 x i32> <i32 38, i32 38, i32 36, i32 36, i32 34, i32 34, i32 32, i32 32, i32 6, i32 6, i32 4, i32 4, i32 2, i32 2, i32 0, i32 0, i32 54, i32 54, i32 52, i32 52, i32 50, i32 50, i32 48, i32 48, i32 22, i32 22, i32 20, i32 20, i32 18, i32 18, i32 16, i32 16>