http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54686
--- Comment #20 from Oleg Endo <olegendo at gcc dot gnu.org> 2012-09-23 23:04:39 UTC --- (In reply to comment #17) > > For llabs: why bother, it isn't like there is anything fancy llabs could be > doing. Is the point that with -Os, a call to llabs is slightly shorter than an > inlined version? I haven't checked, but the only kind of target where this could be true is probably something < 32 bit. Why not leave this decision up to the target and/or middle-end abs expansion? Stuff like "return __x >= 0 ? __x : -__x;" is recognized by the middle-end and turned into an abs RTL, if the target defines one for the mode in question. If not it will expand into if-then-else-something or try out some branch-free alternative.
