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//TEST(compute):COMPARE_COMPUTE_EX(filecheck-buffer=BUF):-slang -compute -shaderobj -output-using-type
//TEST(compute, vulkan):COMPARE_COMPUTE_EX(filecheck-buffer=BUF):-vk -compute -shaderobj -output-using-type
//TEST(compute):COMPARE_COMPUTE_EX(filecheck-buffer=BUF):-cpu -compute -output-using-type -shaderobj
//TEST_INPUT:ubuffer(data=[1], stride=4):out,name=outputBuffer
RWStructuredBuffer<float> outputBuffer;
// This test isn't actually testing the output, but rather that the compiler doesn't crash upon
// encountering a specific loop pattern. ('Data' is non-differentiable here, so the expected output is 0)
//
typedef DifferentialPair<float> dpfloat;
typedef float.Differential dfloat;
struct P
{
bool terminated;
bool isTerminated() { return terminated; }
bool isHit() { return !terminated; }
};
struct Data
{
__init(float dataIn)
{
this.t = dataIn;
}
float t;
};
void updateData(Data data)
{
data.t = data.t * data.t;
}
[BackwardDifferentiable]
float test_simple_while(float y, uint n)
{
Data d = Data(y);
P p;
p.terminated = false;
int i = n;
if (p.isTerminated())
return d.t;
[MaxIters(4)]
while (!p.isTerminated())
{
updateData(d);
p.terminated = (i-- == 0);
if (p.isTerminated())
break;
if (!p.isHit())
break;
}
return d.t;
}
[numthreads(1, 1, 1)]
void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
{
{
dpfloat dpa = dpfloat(1.0, 0.0);
__bwd_diff(test_simple_while)(dpa, 2, 1.0f);
outputBuffer[0] = dpa.d;
//BUF: 0
}
}
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