https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110860
--- Comment #16 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:2d2b05f0691799f03062bf5c436462f14cad3e7c commit r14-3202-g2d2b05f0691799f03062bf5c436462f14cad3e7c Author: Paul Dreik <gccpatc...@pauldreik.se> Date: Mon Aug 14 15:42:33 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.
