1 files changed, 56 insertions, 0 deletions
diff --git a/tests/language-feature/pointer/redundant-coherent-load.slang b/tests/language-feature/pointer/redundant-coherent-load.slang
new file mode 100644
index 000000000..e0c7d5e56
--- /dev/null
+++ b/tests/language-feature/pointer/redundant-coherent-load.slang
@@ -0,0 +1,56 @@
+//TEST:SIMPLE(filecheck=SPIRV):-stage compute -entry computeMain -target spirv -capability vk_mem_model
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-vk -emit-spirv-directly -capability vk_mem_model -output-using-type
+
+// Tests if we optimize redundant load's correctly
+
+//TEST_INPUT:ubuffer(data=[0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+//TEST_INPUT:ubuffer(data=[0 0 0 11 10], stride=4),name=buffer
+uniform int* buffer;
+
+[numthreads(2, 1, 1)]
+void computeMain(uint3 group_thread_id: SV_GroupThreadID)
+{
+    Ptr<int, Access::ReadWrite, AddressSpace::Device> ptr = __getAddress(buffer[0]);
+    
+    // Consider the load from this store-load pattern as redundant since 
+    // the load is a sub-set memory-scope of the memory-scope of the store.
+    // Invocation == Invocation.
+    *ptr = 8;
+    outputBuffer[0] = loadCoherent<4, MemoryScope::Invocation>(ptr);
+    // CHECK: 8
+    // SPIRV: OpStore %ptr %int_8
+    // SPIRV-NOT: OpLoad
+    // SPIRV: %[[#OUTPUT_BUFFER1:]] = OpAccessChain {{.*}} %outputBuffer %{{.*}} %int_0
+    // SPIRV: OpStore %[[#OUTPUT_BUFFER1]] %int_8
+
+    // Consider the load from this store-load pattern as redundant since 
+    // the load is a sub-set memory-scope of the memory-scope of the store.
+    // Device > Workgroup.
+    let offset1 = ptr + 1;
+    storeCoherent<4, MemoryScope::Device>(offset1, 9);
+    outputBuffer[1] = loadCoherent<4, MemoryScope::Workgroup>(offset1);
+    // CHECK-NEXT: 9
+    // SPIRV: %[[#PTR_OFFSET:]] = OpPtrAccessChain {{.*}} %ptr %int_1
+    // SPIRV: OpStore %[[#PTR_OFFSET]] %int_9
+    // SPIRV-NOT: OpLoad
+    // SPIRV: %[[#OUTPUT_BUFFER2:]] = OpAccessChain {{.*}} %outputBuffer %{{.*}} %int_1
+    // SPIRV: OpStore %[[#OUTPUT_BUFFER2]] %int_9
+
+    // Consider the following store-load pattern as not redundant since the data stored
+    // may not be the same data that will be loaded if Workgroup-scope contains
+    // different data than the Subgroup-scope.
+    // Subgroup < Workgroup.
+    let offset2 = ptr + 2;
+    storeCoherent<4, MemoryScope::Subgroup>(offset2, buffer[3]);
+    if(group_thread_id.x == 1)
+    {
+        storeCoherent<4, MemoryScope::Invocation>(offset2, buffer[4]);
+        let result = loadCoherent<4, MemoryScope::Workgroup>(offset2);
+        outputBuffer[2] = (result == 11 || result == 10) ? 12 : 0;
+    }
+    // CHECK-NEXT: 12
+    // SPIRV: OpStore {{.*}}MakePointerAvailable{{.*}} 4 %int_3
+    // SPIRV: OpStore {{.*}}MakePointerAvailable{{.*}} 4 %int_4
+    // SPIRV: OpLoad {{.*}}MakePointerVisible{{.*}} 4 %int_2
+}
+\ No newline at end of file