1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
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
}
|
