[X86][AVX2] Simplify PACKUS combine test

Trying to use a AND mask is tricky as after legalization its nigh impossible for computeKnownBits to do anything with it

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@314630 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/X86/vector-shuffle-combining-avx2.ll b/test/CodeGen/X86/vector-shuffle-combining-avx2.ll
index bd1b23c45bdb92111e02b2805118cd5d897e8d1c..69a6eb7effabea296f08723d9b5ce8f512915b53 100644 (file)
--- a/test/CodeGen/X86/vector-shuffle-combining-avx2.ll
+++ b/test/CodeGen/X86/vector-shuffle-combining-avx2.ll
@@ -846,18 +846,18 @@ declare <32 x i8> @llvm.x86.avx2.packsswb(<16 x i16>, <16 x i16>) nounwind readn
 define <16 x i16> @shuffle_combine_packusdw_pshufb(<8 x i32> %a0, <8 x i32> %a1) {
 ; X32-LABEL: shuffle_combine_packusdw_pshufb:
 ; X32:       # BB#0:
-; X32-NEXT:    vpand {{\.LCPI.*}}, %ymm0, %ymm0
+; X32-NEXT:    vpsrld $16, %ymm0, %ymm0
 ; X32-NEXT:    vpackusdw %ymm0, %ymm0, %ymm0
 ; X32-NEXT:    vpshufb {{.*#+}} ymm0 = ymm0[6,7,4,5,2,3,0,1,6,7,4,5,2,3,0,1,16,17,18,19,20,21,22,23,22,23,20,21,18,19,16,17]
 ; X32-NEXT:    retl
 ;
 ; X64-LABEL: shuffle_combine_packusdw_pshufb:
 ; X64:       # BB#0:
-; X64-NEXT:    vpand {{.*}}(%rip), %ymm0, %ymm0
+; X64-NEXT:    vpsrld $16, %ymm0, %ymm0
 ; X64-NEXT:    vpackusdw %ymm0, %ymm0, %ymm0
 ; X64-NEXT:    vpshufb {{.*#+}} ymm0 = ymm0[6,7,4,5,2,3,0,1,6,7,4,5,2,3,0,1,16,17,18,19,20,21,22,23,22,23,20,21,18,19,16,17]
 ; X64-NEXT:    retq
-  %1 = and <8 x i32> %a0, <i32 255, i32 65535, i32 255, i32 65535, i32 255, i32 255, i32 255, i32 65535>
+  %1 = lshr <8 x i32> %a0, <i32 16, i32 16, i32 16, i32 16, i32 16, i32 16, i32 16, i32 16>
   %2 = tail call <16 x i16> @llvm.x86.avx2.packusdw(<8 x i32> %1, <8 x i32> %1)
   %3 = shufflevector <16 x i16> %2, <16 x i16> undef, <16 x i32> <i32 3, i32 2, i32 1, i32 0, i32 3, i32 2, i32 1, i32 0, i32 8, i32 9, i32 10, i32 11, i32 11, i32 10, i32 9, i32 8>
   ret <16 x i16> %3