steve, 25 days ago

This implementation of cos(πx) and sin(πx) for Float16 came out pretty neat: https://github.com/stephentyrone/swift-numerics/blob/trig-pi/Sources/_NumericsShims/sincospif16.s

Throughput for this scalar implementation is about 1.75ns/element on M1, which is ... tolerable. I expect that it could go somewhat faster, but this is nice and pretty tidy.

The equivalent pure Swift implementation I have takes about 2.3ns/element, largely due to not having a means to do a "convert float to integer, and just give me some don't-care value if its out of range" (which you can't spell in C either), but I already put a patch up to add the machinery that I need for it in Swift, so we'll get that straightened out and see where we stand.