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// Test that the compiler can hoist the texture sample out of the loop.
// We currently have no way to verify the hoist actually take place, but this test
// allows us to manually inspect the generated code to see that happen.
// TODO: use a pattern checker on the resulting code to make sure there is only
// one call to `SampleLevel`.
//TEST(compute):COMPARE_COMPUTE_EX:-slang -compute -shaderobj -output-using-type
//TEST(compute, vulkan):COMPARE_COMPUTE_EX:-vk -compute -shaderobj -output-using-type
//TEST(compute):COMPARE_COMPUTE_EX:-cpu -compute -output-using-type -shaderobj
//TEST(compute):COMPARE_COMPUTE:-slang -compute -mtl -output-using-type -render-features argument-buffer-tier-2
//TEST_INPUT:ubuffer(data=[0 0 0 0 0], stride=4):out,name=outputBuffer
RWStructuredBuffer<float> outputBuffer;
struct Params : IDifferentiable
{
Texture2D tex;
SamplerState sampler;
}
//TEST_INPUT:set gParams = new Params{Texture2D(size=4, content=one), Sampler}
ParameterBlock<Params> gParams;
[BackwardDifferentiable]
float f(float x)
{
float sum = 0.0;
for (int i = 0; i < 3; i++)
{
float t = (no_diff gParams.tex.SampleLevel(gParams.sampler, float2(0.0), 0)).x;
sum += t * x * x;
}
return sum;
}
[numthreads(1, 1, 1)]
void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
{
var dpa = diffPair(3.0);
__bwd_diff(f)(dpa, 1.0);
outputBuffer[0] = dpa.d.x; // Expect: 18
}
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