https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102930
--- Comment #3 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> --- (In reply to Jakub Jelinek from comment #2) > I think there is nothing that can be done about this, and something like > this has been there since forever. While perhaps some double routines in > glibc used to be at some point correctly roundded, many others (e.g. float > or long double) never were, there is always a chance you get different > results from compile time folding vs. runtime evaluation. In this case, for its optimizations, GCC shouldn't assume that these results are equal.
