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

Marek Olšák maraeo at gmail.com
Fri Oct 6 02:08:18 UTC 2017


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


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