[Lockal]

It makes zero sense to measure performance without measuring correctness. Especially, when you use LLM. Here is even faster asin(): `return 0;`

This precisions should be measured in avg and worst ULP, not in "charts". A good approximation should also give exact results in critical points (-1/0/-1 in this case).

The "faster" version gives this:

  asin(0) = 6.75268e-05 (double precision)

Which gives around 5e+15 ULPs, while common libc math implementations targets 19 ULPs (but will be 0 for asin(0)).