Re: [PATCH v2 0/5] MR224: tests: Test coarse and fine derivates and demand less precision from ddx() and ddy().

[Zebediah Figura (＠zfigura)]

On Tue Jun 20 12:13:35 2023 +0000, Henri Verbeet wrote:
> > Right. It's not actually called 2.1. The actual profile is two
>
> different profiles, ps_2_a and ps_2_b, which both compile to a version
> token of 2.1 in the bytecode. I don't know what the difference between a
> and b is.
> IIRC ps_2_a was the NVIDIA variant and ps_2_b the ATI variant at the
> time, and they had slightly different features and limits. I'm not sure
> the differences are particularly well documented anywhere, but you may
> be able to find something in the GPU vendor documentation from back then.

Odd, given they seem to emit the same bytecode. I guess those features must have been checked at compile time.