https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96044
--- Comment #6 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> --- (In reply to Richard Biener from comment #5) > Vincent, any guidance on that? I guess the actual runtime implementation in > glibc may be "fast" because it's not accurate (evaluating takes 0.00s with > glibc 2.26 ...) I confirm the issue. I've just added this testcase in MPFR.