--- /dev/null
+; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s
+
+; Test that when extracting the same unknown vector index from an
+; insertelement the dynamic indexing is folded away.
+
+declare i32 @llvm.amdgcn.workitem.id.x() #0
+
+; No dynamic indexing required
+; GCN-LABEL: {{^}}extract_insert_same_dynelt_v4i32:
+; GCN: s_load_dword [[VAL:s[0-9]+]], s{{\[[0-9]+:[0-9]+\]}}, 0xd{{$}}
+; GCN-NOT buffer_load_dword
+; GCN-NOT: [[VAL]]
+; GCN: v_mov_b32_e32 [[VVAL:v[0-9]+]], [[VAL]]
+; GCN-NOT: [[VVAL]]
+; GCN: buffer_store_dword [[VVAL]]
+define void @extract_insert_same_dynelt_v4i32(i32 addrspace(1)* %out, <4 x i32> addrspace(1)* %in, i32 %val, i32 %idx) #1 {
+ %id = call i32 @llvm.amdgcn.workitem.id.x()
+ %id.ext = sext i32 %id to i64
+ %gep.in = getelementptr inbounds <4 x i32>, <4 x i32> addrspace(1)* %in, i64 %id.ext
+ %gep.out = getelementptr inbounds i32, i32 addrspace(1)* %out, i64 %id.ext
+ %vec = load <4 x i32>, <4 x i32> addrspace(1)* %gep.in
+ %insert = insertelement <4 x i32> %vec, i32 %val, i32 %idx
+ %extract = extractelement <4 x i32> %insert, i32 %idx
+ store i32 %extract, i32 addrspace(1)* %gep.out
+ ret void
+}
+
+; GCN-LABEL: {{^}}extract_insert_different_dynelt_v4i32:
+; GCN: buffer_load_dwordx4
+; GCN: v_movreld_b32
+; GCN: v_movrels_b32
+; GCN: buffer_store_dword v
+define void @extract_insert_different_dynelt_v4i32(i32 addrspace(1)* %out, <4 x i32> addrspace(1)* %in, i32 %val, i32 %idx0, i32 %idx1) #1 {
+ %id = call i32 @llvm.amdgcn.workitem.id.x()
+ %id.ext = sext i32 %id to i64
+ %gep.in = getelementptr inbounds <4 x i32>, <4 x i32> addrspace(1)* %in, i64 %id.ext
+ %gep.out = getelementptr inbounds i32, i32 addrspace(1)* %out, i64 %id.ext
+ %vec = load <4 x i32>, <4 x i32> addrspace(1)* %gep.in
+ %insert = insertelement <4 x i32> %vec, i32 %val, i32 %idx0
+ %extract = extractelement <4 x i32> %insert, i32 %idx1
+ store i32 %extract, i32 addrspace(1)* %gep.out
+ ret void
+}
+
+; GCN-LABEL: {{^}}extract_insert_same_elt2_v4i32:
+; GCN: s_load_dword [[VAL:s[0-9]+]], s{{\[[0-9]+:[0-9]+\]}}, 0xd{{$}}
+; GCN-NOT buffer_load_dword
+; GCN-NOT: [[VAL]]
+; GCN: v_mov_b32_e32 [[VVAL:v[0-9]+]], [[VAL]]
+; GCN-NOT: [[VVAL]]
+; GCN: buffer_store_dword [[VVAL]]
+define void @extract_insert_same_elt2_v4i32(i32 addrspace(1)* %out, <4 x i32> addrspace(1)* %in, i32 %val, i32 %idx) #1 {
+ %id = call i32 @llvm.amdgcn.workitem.id.x()
+ %id.ext = sext i32 %id to i64
+ %gep.in = getelementptr inbounds <4 x i32>, <4 x i32> addrspace(1)* %in, i64 %id.ext
+ %gep.out = getelementptr inbounds i32, i32 addrspace(1)* %out, i64 %id.ext
+ %vec = load <4 x i32>, <4 x i32> addrspace(1)* %gep.in
+ %insert = insertelement <4 x i32> %vec, i32 %val, i32 %idx
+ %extract = extractelement <4 x i32> %insert, i32 %idx
+ store i32 %extract, i32 addrspace(1)* %gep.out
+ ret void
+}
+
+
+attributes #0 = { nounwind readnone }
+attributes #1 = { nounwind }
\ No newline at end of file