[X86] Add tests showing failure to merge shuffles through avx2 shift binops

Author: RKSimon

llvm/test/CodeGen/X86/combine-avx2-intrinsics.ll

@@ -122,6 +122,55 @@ define <4 x i64> @demandedelts_vpsrlvq(<4 x i64> %a0, <4 x i64> %a1) {
   ret <4 x i64> %result
 }
 
+;
+; isBinOp Handling (TODO)
+;
+
+define <4 x i32> @binop_shuffle_vpsllvd(<4 x i32> %a0, <4 x i32> %a1) {
+; CHECK-LABEL: binop_shuffle_vpsllvd:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vpshufd {{.*#+}} xmm0 = xmm0[3,2,1,0]
+; CHECK-NEXT:    vpshufd {{.*#+}} xmm1 = xmm1[3,2,1,0]
+; CHECK-NEXT:    vpsllvd %xmm1, %xmm0, %xmm0
+; CHECK-NEXT:    vpshufd {{.*#+}} xmm0 = xmm0[3,2,1,0]
+; CHECK-NEXT:    retq
+  %shuffle0 = shufflevector <4 x i32> %a0, <4 x i32> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
+  %shuffle1 = shufflevector <4 x i32> %a1, <4 x i32> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
+  %shift = call <4 x i32> @llvm.x86.avx2.psllv.d(<4 x i32> %shuffle0, <4 x i32> %shuffle1)
+  %res = shufflevector <4 x i32> %shift, <4 x i32> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
+  ret <4 x i32> %res
+}
+
+define <8 x i32> @binop_shuffle_vpsravd(<8 x i32> %a0, <8 x i32> %a1) {
+; CHECK-LABEL: binop_shuffle_vpsravd:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vpshufd {{.*#+}} ymm0 = ymm0[3,2,1,0,7,6,5,4]
+; CHECK-NEXT:    vpshufd {{.*#+}} ymm1 = ymm1[3,2,1,0,7,6,5,4]
+; CHECK-NEXT:    vpsravd %ymm1, %ymm0, %ymm0
+; CHECK-NEXT:    vpshufd {{.*#+}} ymm0 = ymm0[3,2,1,0,7,6,5,4]
+; CHECK-NEXT:    retq
+  %shuffle0 = shufflevector <8 x i32> %a0, <8 x i32> undef, <8 x i32> <i32 3, i32 2, i32 1, i32 0, i32 7, i32 6, i32 5, i32 4>
+  %shuffle1 = shufflevector <8 x i32> %a1, <8 x i32> undef, <8 x i32> <i32 3, i32 2, i32 1, i32 0, i32 7, i32 6, i32 5, i32 4>
+  %shift = call <8 x i32> @llvm.x86.avx2.psrav.d.256(<8 x i32> %shuffle0, <8 x i32> %shuffle1)
+  %res = shufflevector <8 x i32> %shift, <8 x i32> undef, <8 x i32> <i32 3, i32 2, i32 1, i32 0, i32 7, i32 6, i32 5, i32 4>
+  ret <8 x i32> %res
+}
+
+define <4 x i64> @binop_shuffle_vpsrlvq(<4 x i64> %a0, <4 x i64> %a1) {
+; CHECK-LABEL: binop_shuffle_vpsrlvq:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vpermq {{.*#+}} ymm0 = ymm0[3,2,1,0]
+; CHECK-NEXT:    vpermq {{.*#+}} ymm1 = ymm1[3,2,1,0]
+; CHECK-NEXT:    vpsrlvq %ymm1, %ymm0, %ymm0
+; CHECK-NEXT:    vpermq {{.*#+}} ymm0 = ymm0[3,2,1,0]
+; CHECK-NEXT:    retq
+  %shuffle0 = shufflevector <4 x i64> %a0, <4 x i64> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
+  %shuffle1 = shufflevector <4 x i64> %a1, <4 x i64> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
+  %shift = call <4 x i64> @llvm.x86.avx2.psrlv.q.256(<4 x i64> %shuffle0, <4 x i64> %shuffle1)
+  %res = shufflevector <4 x i64> %shift, <4 x i64> undef, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
+  ret <4 x i64> %res
+}
+
 declare <16 x i16> @llvm.x86.avx2.pblendw(<16 x i16>, <16 x i16>, i32)
 declare <4 x i32> @llvm.x86.avx2.pblendd.128(<4 x i32>, <4 x i32>, i32)
 declare <8 x i32> @llvm.x86.avx2.pblendd.256(<8 x i32>, <8 x i32>, i32)