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//TEST(compute):COMPARE_COMPUTE_EX:-cpu -compute -output-using-type -shaderobj
//TEST(compute):COMPARE_COMPUTE_EX:-vk -compute -shaderobj -output-using-type
//TEST(compute):COMPARE_COMPUTE_EX:-cuda -compute -shaderobj -output-using-type
//TEST(compute):COMPARE_COMPUTE_EX:-dx12 -compute -shaderobj -output-using-type
//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
RWStructuredBuffer<float> outputBuffer;
struct A : IDifferentiable
{
float x;
int nx;
}
[BackwardDifferentiable]
float f(A x)
{
A rs;
rs.x = 1.0;
for (int i = 0; i < 2; i++)
rs.x = rs.x * x.x;
return rs.x;
}
[BackwardDifferentiable]
float outerF(A x)
{
A nx;
nx.x = 1.0;
int i = 0;
[MaxIters(3)]
do
{
nx.x = nx.x * x.x;
i++;
}
while (i < 2);
nx.nx = 2;//x.nx;
return f(nx);
}
[BackwardDifferentiable]
float df(A x)
{
A.Differential ad;
ad.x = 0.0;
var p = diffPair(x, ad);
__bwd_diff(outerF)(p, 1.0);
return p.d.x;
}
[numthreads(1, 1, 1)]
void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
{
// Given f(x) = x^4,
// f''(x) = 12 * x^2
// Expect f''(4) = 192
A a;
a.x = 4.0;
a.nx = 54;
A.Differential ad;
ad.x = 1.0;
var p = diffPair(a, ad);
outputBuffer[0] = __fwd_diff(df)(p).d;
}
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