https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68743
--- Comment #17 from dave.anglin at bell dot net --- On 2015-12-13, at 1:36 PM, sgk at troutmask dot apl.washington.edu wrote: > If gcc is doing an optimization that changes (float)floor(x) to > __builtin_floorf() and then __builtin_floorf() is mapped to libm's > floorf(), then that optimization is broken if it is not guarded > by a HAVE_FLOORF macro. That is exactly what appears to happen. There doesn't appear to be any configure test for floorf. > I'm not an expert on the nuances of the > C standard, but it would that a libm could have > > #define floorf(x) ((float)floor((double)(x)) > > in math.h. I agree. > Perhaps, adding a few pessimizations will prevent gcc > from doing the optimization. Will give these a whirl. Dave -- John David Anglin dave.ang...@bell.net
