Comment by peterabbitcook

I am curious, did you check how much your benchmarks moved (time and errors) if at all if you told the compiler to use —-use_fast_math or -ffast-math?

There’s generally not a faster version of inverse trig functions to inline, but it might optimize some other stuff out.

Unrelated to that, I’ve seen implementations (ie julia/base/special/trig) that use a “rational approximation” to asin, did you go down that road at any point?