https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101955
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |jakub at gcc dot gnu.org
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Andreas Schwab from comment #2)
> If you want to be agressive you can optimize f to return 0.
In the middle-end? No, whether it is well defined or undefined depends heavily
on the C/C++ version.
At least ubsan flags it only with C99..C2X, not in C89 nor any C++ versions for
b 1.
For b -1 flaged in C99..C2X and C++11..C++17. C89, C++98 and C++20..C++23
accept that.
Similarly for b > 1, flagged in C99..C2x and C++11..C++17 only.
