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//TEST:SIMPLE(filecheck=SPV): -target spirv -O0
//TEST:SIMPLE(filecheck=CUDA): -target cuda -entry compute_main -stage compute
//TEST:SIMPLE(filecheck=PTX): -target ptx -entry compute_main -stage compute
// Check that we can specialize buffer loads through user pointers, and
// do not load big struct elements into registers unnecessarily.
struct Bottom
{
float bigArray[1024];
float bottomGetValue(int index) { return bigArray[index]; }
}
struct Middle
{
Bottom bottom;
float middleGetValue(int index) { return bottom.bottomGetValue(index); }
}
struct Top
{
StructuredBuffer<Middle*>.Handle middle;
// Calling `middleGetValue` on `middle[0]` should not causing the entire `Middle`
// struct to be loaded into registers. Instead, we should be able to specialize
// `middleGetValue` to take a `Middle*` and recursively specialize `bottomGetValue`
// to only load the `Bottom.bigArray[index]` element.
float topGetValue(int index) { return middle[0].middleGetValue(index); }
}
struct Root
{
Top top;
}
ConstantBuffer<Root> cb;
RWStructuredBuffer<float> outputBuffer;
// Check that the generated CUDA code never loads a `Middle` or `Bottom` struct into a local var.
// CUDA-NOT: Middle{{[_A-Za-z0-9]*}} {{[a-zA-Z0-9_]+}} =
// CUDA-NOT: Bottom{{[_A-Za-z0-9]*}} {{[a-zA-Z0-9_]+}} =
// CUDA-NOT: Top{{[_A-Za-z0-9]*}} {{[a-zA-Z0-9_]+}} =
// Check that the generated CUDA code can be compiled by nvrtc correctly into PTX.
// PTX: compute_main
// Check that the generated (unoptimized) SPIR-V contains a specialized Bottom_bottomGetValue function
// that takes in a Bottom* and use access chain to load the required array element directly, without
// needing to load the entire Bottom struct.
// SPV: %Bottom_bottomGetValue = OpFunction %float None
// SPV: OpFunctionParameter %_ptr_PhysicalStorageBuffer_Middle_natural
// SPV: %[[INDEX:[A-Za-z0-9_]+]] = OpFunctionParameter %int
// SPV: %[[PTR:[A-Za-z0-9_]+]] = OpAccessChain %_ptr_PhysicalStorageBuffer_float %{{.*}} %[[INDEX]]
// SPV: %[[VALUE:[A-Za-z0-9_]+]] = OpLoad %float %[[PTR]]
// SPV: OpReturnValue %[[VALUE]]
[shader("compute")]
[numthreads(1, 1, 1)]
void compute_main(uint3 tid: SV_DispatchThreadID)
{
outputBuffer[0] = cb.top.topGetValue(0);
}
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