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//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_INPUT:ubuffer(data=[0 0 0 0 0], stride=4):out,name=outputBuffer
RWStructuredBuffer<float> outputBuffer;
struct A : IDifferentiable
{
float x;
float y;
};
[BackwardDifferentiable]
A f(A a)
{
// Read/writes to local struct variables won't be SSA'd out by default.
// The backward diff preparation pass will kick in to create temp vars for them.
A aout;
aout.y = 2 * a.x;
aout.y = aout.y + 2 * a.x;
aout.x = aout.y + 5 * a.x;
// The result should be equivalent to:
/*
A aout;
var tmp = 2 * a.x;
tmp = tmp + 2 * a.x;
aout.y = tmp;
aout.x = tmp + 5 * a.x;
*/
return aout;
}
[numthreads(1, 1, 1)]
void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
{
A a = {1.0, 2.0};
var dpa = diffPair(a);
A.Differential dout = {1.0, 1.0};
__bwd_diff(f)(dpa, dout);
outputBuffer[0] = dpa.d.x; // Expect: 13
outputBuffer[1] = dpa.d.y; // Expect: 0
}
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