https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110860
--- Comment #17 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-13 branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:559341b5b5a30448362f3f205cd1bf043a919945 commit r13-7722-g559341b5b5a30448362f3f205cd1bf043a919945 Author: Jonathan Wakely <jwak...@redhat.com> Date: Fri Aug 11 18:10:29 2023 +0100 libstdc++: Avoid problematic use of log10 in std::format [PR110860] If abs(__v) is smaller than one, the result will be of the form 0.xxxxx. It is only if the magnitude is large that more digits are needed before the decimal dot. This uses frexp instead of log10 which should be less expensive and have sufficient precision for the desired purpose. It removes the problematic cases where log10 will be negative or not fit in an int. Signed-off-by: Paul Dreik <gccpatc...@pauldreik.se> libstdc++-v3/ChangeLog: PR libstdc++/110860 * include/std/format (__formatter_fp::format): Use frexp instead of log10. (cherry picked from commit 2d2b05f0691799f03062bf5c436462f14cad3e7c)
