[llvm] 7055751 - [X86][AVX2] Add shuffle test case where we fail to merge vpunpcklqdq(vextracti128(x,0),vextracti128(x,1)) -> vpermq

[Simon Pilgrim via llvm-commits]

Author: Simon Pilgrim
Date: 2022-10-13T11:47:37+01:00
New Revision: 7055751115eb1002e25ab03093d0aecae856120f

URL: https://github.com/llvm/llvm-project/commit/7055751115eb1002e25ab03093d0aecae856120f
DIFF: https://github.com/llvm/llvm-project/commit/7055751115eb1002e25ab03093d0aecae856120f.diff

LOG: [X86][AVX2] Add shuffle test case where we fail to merge vpunpcklqdq(vextracti128(x,0),vextracti128(x,1)) -> vpermq

These are likely to appear during truncation

Added: 
    

Modified: 
    llvm/test/CodeGen/X86/vector-shuffle-combining-avx2.ll

Removed: 
    


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diff  --git a/llvm/test/CodeGen/X86/vector-shuffle-combining-avx2.ll b/llvm/test/CodeGen/X86/vector-shuffle-combining-avx2.ll
index 52d853efbe8d1..7438b0a7f5cb3 100644
--- a/llvm/test/CodeGen/X86/vector-shuffle-combining-avx2.ll
+++ b/llvm/test/CodeGen/X86/vector-shuffle-combining-avx2.ll
@@ -636,6 +636,20 @@ define <16 x i16> @shuffle_combine_packusdw_pshufb(<8 x i32> %a0, <8 x i32> %a1)
 }
 declare <16 x i16> @llvm.x86.avx2.packusdw(<8 x i32>, <8 x i32>) nounwind readnone
 
+; TODO: Failure to merge vpunpcklqdq(vextracti128(x,0),vextracti128(x,1)) -> vpermq
+define <8 x i16> @shuffle_combine_packusdw_permq_extract(<8 x i32> %a0) {
+; CHECK-LABEL: shuffle_combine_packusdw_permq_extract:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vpackusdw %ymm0, %ymm0, %ymm0
+; CHECK-NEXT:    vextracti128 $1, %ymm0, %xmm1
+; CHECK-NEXT:    vpunpcklqdq {{.*#+}} xmm0 = xmm0[0],xmm1[0]
+; CHECK-NEXT:    vzeroupper
+; CHECK-NEXT:    ret{{[l|q]}}
+  %1 = tail call <16 x i16> @llvm.x86.avx2.packusdw(<8 x i32> %a0, <8 x i32> poison)
+  %2 = shufflevector <16 x i16> %1, <16 x i16> poison, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 8, i32 9, i32 10, i32 11>
+  ret <8 x i16> %2
+}
+
 define <32 x i8> @shuffle_combine_packuswb_pshufb(<16 x i16> %a0, <16 x i16> %a1) {
 ; CHECK-LABEL: shuffle_combine_packuswb_pshufb:
 ; CHECK:       # %bb.0: