[Bug tree-optimization/105384] compilation never (?) finishes with __builtin_yn{,f,l} at -O and above

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105384

--- Comment #7 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
Using host libm routines is a bad idea, that would make the generated code 
depend on the host libm and processor.  Having a cut-off to avoid constant 
folding these functions for n >= 128 might make sense (that cut-off is 
chosen as the one beyond which the ISO 24747 versions of the functions, 
and the versions in the standard C++ library, have implementation-defined 
behavior).