[Mesa-dev] [PATCH] ac/nir: use llvm fma intrinsic if nir instruction is exact.

[Connor Abbott]

On Thu, Oct 5, 2017 at 10:08 PM, Marek Olšák <maraeo at gmail.com> wrote:
> On Fri, Oct 6, 2017 at 3:50 AM, Connor Abbott <cwabbott0 at gmail.com> wrote:
>> Why? While it might technically be legal, always generating an unfused
>> mul+add when the user explicitly requested fma() seems harsh...
>
> It's slow on some chips. It doesn't need any other reason.
>
> Marek

Presumably, if the developer asked for fma, then they don't care how
fast or slow it is...