https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115010
--- Comment #13 from Thorsten Otto <ad...@tho-otto.de> --- Now its getting really strange. I've attached a 2nd test case above. With that, the bug can be reproduced also with gcc 11.4.0 (but not with gcc-10, gcc-12 or gcc-13). It is slightly larger than the first case, but also has references to __builtin_mul_overflow(). The 1st test case does not trigger the bug in gcc-11 though. Note that the commit that was identified as the culprit was only applied to the gcc-14 branch, but not to gcc-11.
