[Bug tree-optimization/113339] `-a/-b` is not simplified to `a/b` if done in seperate statements

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113339

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note the fold was added here:
https://gcc.gnu.org/pipermail/gcc-patches/1999-October/020476.html .