https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83353
--- Comment #5 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- asin(sin(a)) is not safe (or at least not simple) because of arguments outside [-pi/2, pi/2]. sin(asin(a)) is more appropriate with -ffast-math because arguments outside [-1,1] are excluded by -ffinite-math-only, which -ffast-math implies.
