1 files changed, 130 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/AMDGPU/ds-combine-with-dependence.ll b/llvm/test/CodeGen/AMDGPU/ds-combine-with-dependence.ll
new file mode 100644
index 00000000000..06fa048124a
--- /dev/null
+++ b/llvm/test/CodeGen/AMDGPU/ds-combine-with-dependence.ll
@@ -0,0 +1,130 @@
+; RUN: llc -march=amdgcn -mcpu=gfx900 -verify-machineinstrs < %s | FileCheck -check-prefixes=GCN %s
+
+
+; There is no dependence between the store and the two loads. So we can combine the loads
+; and the combined load is at the original place of the second load.
+
+; GCN-LABEL: {{^}}ds_combine_nodep
+
+; GCN:      ds_write2_b32 v{{[0-9]+}}, v{{[0-9]+}}, v{{[0-9]+}} offset0:26 offset1:27
+; GCN-NEXT: ds_read2_b32 v{{\[[0-9]+:[0-9]+\]}}, v{{[0-9]+}} offset0:7 offset1:8
+define amdgpu_kernel void @ds_combine_nodep(float addrspace(1)* %out, float addrspace(3)* %inptr) {
+
+  %base = bitcast float addrspace(3)* %inptr to i8 addrspace(3)*
+  %addr0 = getelementptr i8, i8 addrspace(3)* %base, i32 24
+  %tmp0 = bitcast i8 addrspace(3)* %addr0 to float addrspace(3)*
+  %vaddr0 = bitcast float addrspace(3)* %tmp0 to <3 x float> addrspace(3)*
+  %load0 = load <3 x float>, <3 x float> addrspace(3)* %vaddr0, align 4
+  %v0 = extractelement <3 x float> %load0, i32 2
+
+  %tmp1 = insertelement <2 x float> undef, float 1.0, i32 0
+  %data = insertelement <2 x float> %tmp1, float 2.0, i32 1
+
+  %tmp2 = getelementptr float, float addrspace(3)* %inptr, i32 26
+  %vaddrs = bitcast float addrspace(3)* %tmp2 to <2 x float> addrspace(3)*
+  store <2 x float> %data, <2 x float> addrspace(3)* %vaddrs, align 4
+
+  %vaddr1 = getelementptr float, float addrspace(3)* %inptr, i32 7
+  %v1 = load float, float addrspace(3)* %vaddr1, align 4
+
+  %sum = fadd float %v0, %v1
+  store float %sum, float addrspace(1)* %out, align 4
+  ret void
+}
+
+
+; The store depends on the first load, so we could not move the first load down to combine with
+; the second load directly. However, we can move the store after the combined load.
+
+; GCN-LABEL: {{^}}ds_combine_WAR
+
+; GCN:      ds_read2_b32 v{{\[[0-9]+:[0-9]+\]}}, v{{[0-9]+}} offset0:7 offset1:27
+; GCN-NEXT: ds_write2_b32 v{{[0-9]+}}, v{{[0-9]+}}, v{{[0-9]+}} offset0:26 offset1:27
+define amdgpu_kernel void @ds_combine_WAR(float addrspace(1)* %out, float addrspace(3)* %inptr) {
+
+  %base = bitcast float addrspace(3)* %inptr to i8 addrspace(3)*
+  %addr0 = getelementptr i8, i8 addrspace(3)* %base, i32 100
+  %tmp0 = bitcast i8 addrspace(3)* %addr0 to float addrspace(3)*
+  %vaddr0 = bitcast float addrspace(3)* %tmp0 to <3 x float> addrspace(3)*
+  %load0 = load <3 x float>, <3 x float> addrspace(3)* %vaddr0, align 4
+  %v0 = extractelement <3 x float> %load0, i32 2
+
+  %tmp1 = insertelement <2 x float> undef, float 1.0, i32 0
+  %data = insertelement <2 x float> %tmp1, float 2.0, i32 1
+
+  %tmp2 = getelementptr float, float addrspace(3)* %inptr, i32 26
+  %vaddrs = bitcast float addrspace(3)* %tmp2 to <2 x float> addrspace(3)*
+  store <2 x float> %data, <2 x float> addrspace(3)* %vaddrs, align 4
+
+  %vaddr1 = getelementptr float, float addrspace(3)* %inptr, i32 7
+  %v1 = load float, float addrspace(3)* %vaddr1, align 4
+
+  %sum = fadd float %v0, %v1
+  store float %sum, float addrspace(1)* %out, align 4
+  ret void
+}
+
+
+; The second load depends on the store. We can combine the two loads, and the combined load is
+; at the original place of the second load.
+
+; GCN-LABEL: {{^}}ds_combine_RAW
+
+; GCN:      ds_write2_b32 v{{[0-9]+}}, v{{[0-9]+}}, v{{[0-9]+}} offset0:26 offset1:27
+; GCN-NEXT: ds_read2_b32 v{{\[[0-9]+:[0-9]+\]}}, v{{[0-9]+}} offset0:8 offset1:26
+define amdgpu_kernel void @ds_combine_RAW(float addrspace(1)* %out, float addrspace(3)* %inptr) {
+
+  %base = bitcast float addrspace(3)* %inptr to i8 addrspace(3)*
+  %addr0 = getelementptr i8, i8 addrspace(3)* %base, i32 24
+  %tmp0 = bitcast i8 addrspace(3)* %addr0 to float addrspace(3)*
+  %vaddr0 = bitcast float addrspace(3)* %tmp0 to <3 x float> addrspace(3)*
+  %load0 = load <3 x float>, <3 x float> addrspace(3)* %vaddr0, align 4
+  %v0 = extractelement <3 x float> %load0, i32 2
+
+  %tmp1 = insertelement <2 x float> undef, float 1.0, i32 0
+  %data = insertelement <2 x float> %tmp1, float 2.0, i32 1
+
+  %tmp2 = getelementptr float, float addrspace(3)* %inptr, i32 26
+  %vaddrs = bitcast float addrspace(3)* %tmp2 to <2 x float> addrspace(3)*
+  store <2 x float> %data, <2 x float> addrspace(3)* %vaddrs, align 4
+
+  %vaddr1 = getelementptr float, float addrspace(3)* %inptr, i32 26
+  %v1 = load float, float addrspace(3)* %vaddr1, align 4
+
+  %sum = fadd float %v0, %v1
+  store float %sum, float addrspace(1)* %out, align 4
+  ret void
+}
+
+
+; The store depends on the first load, also the second load depends on the store.
+; So we can not combine the two loads.
+
+; GCN-LABEL: {{^}}ds_combine_WAR_RAW
+
+; GCN:      ds_read_b32 v{{[0-9]+}}, v{{[0-9]+}} offset:108
+; GCN-NEXT: ds_write2_b32 v{{[0-9]+}}, v{{[0-9]+}}, v{{[0-9]+}} offset0:26 offset1:27
+; GCN-NEXT: ds_read_b32 v{{[0-9]+}}, v{{[0-9]+}} offset:104
+define amdgpu_kernel void @ds_combine_WAR_RAW(float addrspace(1)* %out, float addrspace(3)* %inptr) {
+
+  %base = bitcast float addrspace(3)* %inptr to i8 addrspace(3)*
+  %addr0 = getelementptr i8, i8 addrspace(3)* %base, i32 100
+  %tmp0 = bitcast i8 addrspace(3)* %addr0 to float addrspace(3)*
+  %vaddr0 = bitcast float addrspace(3)* %tmp0 to <3 x float> addrspace(3)*
+  %load0 = load <3 x float>, <3 x float> addrspace(3)* %vaddr0, align 4
+  %v0 = extractelement <3 x float> %load0, i32 2
+
+  %tmp1 = insertelement <2 x float> undef, float 1.0, i32 0
+  %data = insertelement <2 x float> %tmp1, float 2.0, i32 1
+
+  %tmp2 = getelementptr float, float addrspace(3)* %inptr, i32 26
+  %vaddrs = bitcast float addrspace(3)* %tmp2 to <2 x float> addrspace(3)*
+  store <2 x float> %data, <2 x float> addrspace(3)* %vaddrs, align 4
+
+  %vaddr1 = getelementptr float, float addrspace(3)* %inptr, i32 26
+  %v1 = load float, float addrspace(3)* %vaddr1, align 4
+
+  %sum = fadd float %v0, %v1
+  store float %sum, float addrspace(1)* %out, align 4
+  ret void
+}