[llvm] ab5da4b - [X86] Add test showing failure to concat X86ISD::PERMI nodes with different immediates (#203487)

[via llvm-commits]

Author: Simon Pilgrim
Date: 2026-06-12T10:15:04Z
New Revision: ab5da4b999f862e5b165ac87dd9b90ff162e048b

URL: https://github.com/llvm/llvm-project/commit/ab5da4b999f862e5b165ac87dd9b90ff162e048b
DIFF: https://github.com/llvm/llvm-project/commit/ab5da4b999f862e5b165ac87dd9b90ff162e048b.diff

LOG: [X86] Add test showing failure to concat X86ISD::PERMI nodes with different immediates (#203487)

Added: 
    

Modified: 
    llvm/test/CodeGen/X86/vector-shuffle-combining-avx512f.ll

Removed: 
    


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diff  --git a/llvm/test/CodeGen/X86/vector-shuffle-combining-avx512f.ll b/llvm/test/CodeGen/X86/vector-shuffle-combining-avx512f.ll
index 213445ca09005..9cdbce354ad37 100644
--- a/llvm/test/CodeGen/X86/vector-shuffle-combining-avx512f.ll
+++ b/llvm/test/CodeGen/X86/vector-shuffle-combining-avx512f.ll
@@ -1112,6 +1112,22 @@ define <16 x i32> @combine_vcompressd_splat(i16 %m) {
   ret <16 x i32> %res
 }
 
+define <8 x i64> @concat_nonuniform_permq_v4i64_v8i64(<4 x i64> %a0, <4 x i64> %a1, <2 x i64> %a2) nounwind {
+; CHECK-LABEL: concat_nonuniform_permq_v4i64_v8i64:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vpermq {{.*#+}} ymm0 = ymm0[1,3,2,0]
+; CHECK-NEXT:    vpermq {{.*#+}} ymm1 = ymm1[3,2,1,0]
+; CHECK-NEXT:    vinserti64x4 $1, %ymm1, %zmm0, %zmm0
+; CHECK-NEXT:    vpsrlq %xmm2, %zmm0, %zmm0
+; CHECK-NEXT:    ret{{[l|q]}}
+  %perm0 = shufflevector <4 x i64> %a0, <4 x i64> poison, <4 x i32> <i32 1, i32 3, i32 2, i32 0>
+  %perm1 = shufflevector <4 x i64> %a1, <4 x i64> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
+  %shift0 = tail call noundef <4 x i64> @llvm.x86.avx2.psrl.q(<4 x i64> %perm0, <2 x i64> %a2)
+  %shift1 = tail call noundef <4 x i64> @llvm.x86.avx2.psrl.q(<4 x i64> %perm1, <2 x i64> %a2)
+  %shuffle = shufflevector <4 x i64> %shift0, <4 x i64> %shift1, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
+  ret <8 x i64> %shuffle
+}
+
 define <8 x i64> @PR179008(ptr %p0) {
 ; X86-AVX512F-LABEL: PR179008:
 ; X86-AVX512F:       # %bb.0: