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//TEST_CATEGORY(wave, compute)
//DISABLE_TEST:COMPARE_COMPUTE_EX:-cpu -compute -shaderobj
//DISABLE_TEST:COMPARE_COMPUTE_EX:-slang -compute -shaderobj
//TEST:COMPARE_COMPUTE_EX:-slang -compute -dx12 -profile cs_6_0 -shaderobj -render-feature hardware-device
//TEST(vulkan):COMPARE_COMPUTE_EX:-vk -compute -shaderobj -render-feature hardware-device
//TEST:COMPARE_COMPUTE_EX:-cuda -compute -capability cuda_sm_7_0 -shaderobj
//TEST:COMPARE_COMPUTE_EX:-metal -compute -shaderobj
// WGSL doesn't support wave functions in a dynamic control flow; it works with uniform control flow.
//DISABLE_TEST:COMPARE_COMPUTE_EX:-wgpu -compute -shaderobj
//TEST_INPUT:ubuffer(data=[0 0 0 0 0 0 0 0], stride=4):out,name outputBuffer
RWStructuredBuffer<int> outputBuffer;
[numthreads(8, 1, 1)]
void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
{
const int idx = int(dispatchThreadID.x);
#if 1
if (idx < 3)
{
// Diverge!!
outputBuffer[idx] = -1; // thread 0, 1 and 2 will get 0xFFFFFFFF
return;
}
// thread 2, 3, 4, 5, 6, 7 will get the result of 2 * 3 * 4 * 5 * 6 * 7
// which is 2520, which is 9D8 in hex
outputBuffer[idx] = WaveActiveProduct(idx);
#else
/// NOTE! Can't say I totally understand WaveActiveProduct.
/// The following returns 0x240 on CUDA - which is what I'd expect
/// On DX12, it returns 0
outputBuffer[idx] = WaveActiveProduct((idx & 3) + 1);
#endif
}
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