[libre-riscv-dev] fp special functions

Luke Kenneth Casson Leighton lkcl at lkcl.net
Mon Aug 5 01:36:09 BST 2019

On Sun, Aug 4, 2019 at 7:17 PM Jacob Lifshay <programmerjake at gmail.com> wrote:

> trig-pi functions (range reduction is trivial (x mod 2.0)):
> * sinpi
> * cospi
> * sincospi (non-standard; like sincos)
> * atan2pi

oof.  that's... 85% of funct5=01011 taken up:

please review / check, make sure i didn't miss any from the list.
this is *1-op* only, i'll do 2-op later.

sincos and sincospi do simultaneous sin and cosine result, i'd
recommend those be done as fused macro-ops, that's generally how
2-result-op is done in RISC-V.


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