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//TEST(compute):COMPARE_COMPUTE_EX:-slang -compute -shaderobj -output-using-type
//TEST(compute):COMPARE_COMPUTE_EX:-cuda -compute -shaderobj -output-using-type
//TEST:SIMPLE(filecheck=CHECK): -target hlsl -profile cs_5_0 -entry computeMain -line-directive-mode none
//TEST_INPUT:ubuffer(data=[0 0 0 0 0], stride=4):out,name=outputBuffer
RWStructuredBuffer<float> outputBuffer;
typedef DifferentialPair<float> dpfloat;
typedef float.Differential dfloat;
// Test that compute does not have a context.
// CHECK-NOT: struct {{[a-zA-Z0-9_]*}}_compute_{{[a-zA-Z0-9_]*}}
[BackwardDifferentiable]
[PreferRecompute]
float compute(float x, float y, out float k)
{
k = y * 2;
return x * y;
}
// Test that computeLoop compiles to just return 0.
// CHECK: float computeLoop{{[_0-9]*}}(float y{{[_0-9]*}})
// CHECK-NOT: for{{.*}}
// CHECK: return 0
[BackwardDifferentiable]
[PreferRecompute]
float computeLoop(float y)
{
float w = 0;
int i = 0;
[MaxIters(8)]
do
{
float k = float(0.f);
w += compute(i, y, k);
w += k * k;
i++;
}
while (i < 8);
return w - detach(w);
}
// Since computeLoop is recomputed, test_simple_loop should have nothing to store
// therefore we check that there is no intermediate context type generated for test_simple_loop.
// CHECK-NOT: struct {{[a-zA-Z0-9_]*}}test_simple_loop{{[a-zA-Z0-9_]*}}
[BackwardDifferentiable]
float test_simple_loop(float y)
{
float x = computeLoop(y);
return y + x;
}
[numthreads(1, 1, 1)]
void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
{
{
dpfloat dpa = dpfloat(1.0, 0.0);
__bwd_diff(test_simple_loop)(dpa, 1.0f);
outputBuffer[0] = dpa.d; // Expect: 29.0
}
{
dpfloat dpa = dpfloat(0.4, 0.0);
__bwd_diff(test_simple_loop)(dpa, 0.5f);
outputBuffer[1] = dpa.d; // Expect: 14.5
}
outputBuffer[2] = computeLoop(1.0);
}
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