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//TEST(compute):COMPARE_COMPUTE: -shaderobj -output-using-type
//TEST(compute):COMPARE_COMPUTE: -vk -shaderobj -output-using-type
//TEST(compute):COMPARE_COMPUTE:-cpu -shaderobj -output-using-type
//TEST_INPUT:ubuffer(data=[0 0 0 0 0 0 0 0 0], stride=4):out,name=outputBuffer
RWStructuredBuffer<float> outputBuffer;
[Differentiable]
float testFunc(float a)
{
float x = a / (abs(a) + 0.5f);
{
defer x = sqrt(x);
x = x * 0.5f + 0.5f;
if (a < 0)
{
x += 1.0f;
// NOTE suprising but correct behaviour here: 'defer' occurs after
// the return statement's value has been computed, so mutating 'x'
// no longer affects anything.
return x;
}
x += 0.5f;
}
return x;
}
[numthreads(1, 1, 1)]
void computeMain(int3 dispatchThreadID: SV_DispatchThreadID)
{
outputBuffer[0] = testFunc(0);
outputBuffer[1] = testFunc(0.5);
outputBuffer[2] = testFunc(-0.5);
DifferentialPair<float> d1 = diffPair(0.0);
bwd_diff(testFunc)(d1, 1.0);
DifferentialPair<float> d2 = diffPair(0.5);
bwd_diff(testFunc)(d2, 1.0);
DifferentialPair<float> d3 = diffPair(-0.5);
bwd_diff(testFunc)(d3, 1.0);
outputBuffer[3] = d1.d;
outputBuffer[4] = d2.d;
outputBuffer[5] = d3.d;
d1 = diffPair(0.0, 1.0);
d2 = diffPair(0.5, 1.0);
d3 = diffPair(-0.5, 1.0);
outputBuffer[6] = fwd_diff(testFunc)(d1).d;
outputBuffer[7] = fwd_diff(testFunc)(d2).d;
outputBuffer[8] = fwd_diff(testFunc)(d3).d;
}
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