yum-mirror/slang

Making it easier to work with shaders

git clone https://git.yummers.dev/yum-mirror/slang

Yong HeAllow loop counters to be used as constexpr arguments. (#3139)f94b2f7a3

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1//DIAGNOSTIC_TEST:SIMPLE:
2
3float nonDiff(float x)
4{
5    return x;
6}
7
8[ForwardDifferentiable]
9float f(float x)
10{
11    float val = 0;
12    if (x > 5)
13        val = x + 1;
14    else
15        val = nonDiff(x * 2.0f);
16    // Not all path propagates derivatives through.
17    return val;
18}
19
20// error: function does not return a differentiable value.
21[ForwardDifferentiable]
22void g(float x)
23{
24    float val = 0;
25    if (x > 5)
26        val = x + 1;
27
28    for (int i = 0; i < 5; i++) // Not ok, we can't infer the loop iterations because the body modifies induction var.
29    {
30        i = (int)x;
31        no_diff debugBreak();
32    }
33    return;
34}
35
36
37[ForwardDifferentiable]
38float h(float x)
39{
40    float val = 0;
41    // no diagnostic by clarifying intention.
42    val = no_diff(nonDiff(x * 2.0f));
43    return val;
44}