Re: [PATCH v3 0/1] MR321: vkd3d-shader/hlsl: Implement intrinsic tan.

[Petrichor Park (＠petrathekat)]

On Fri Sep  1 17:58:40 2023 +0000, Zebediah Figura wrote:
> > So SM1 has a result and SM4 has another. I'm not sure of what exactly
>
> is mandated by IEEE, and whether SM4 is really expected to fully comply
> with IEEE. Notice that we're not really evaluating on pi/2, because
> that's not representable as a floating point number. So giving a finite,
> however large, doesn't look wrong.
> That also makes sense, although it wouldn't surprise me if software
> expected sinf(M_PI) to really return 0, and so on. So yeah, no objection
> from me to just leaving out the degenerate case.

It's enough of an edge case that I can't imagine the behavior is consistent across platforms even with real d3d.