https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77453
--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- Most built-in versions of libm functions just optimize them for constant arguments.
joseph at codesourcery dot com Fri, 02 Sep 2016 05:05:52 -0700
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77453
--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- Most built-in versions of libm functions just optimize them for constant arguments.