https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97142
--- Comment #5 from Dave Love <fx at gnu dot org> --- I meant to show that x86_64 expands the built in fmod too. (I wasn't sure whether "inline" was the right term, as it seems not to be done by -finline-functions.) Yes, xlf -O3 (?) and above imlies something like -ffast-math. xlf also does vectorized maths functions, but I don't think the speed of libm is as relevant as not calling out to it. (Nothing leapt out from profiles for the rest of that set to suggest other builtins are similar, but I haven't examined them closely.) I'll attach the assembler, which there's an awful lot of compared with x86_64.
