[Bug c/115539] Misoptimization of application at -O2 -g on x86-64 causing segfaults on valid memory accesses where it works on both clang and gcc at -g (no -O2)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115539

--- Comment #5 from Sam James <sjames at gcc dot gnu.org> ---
fastreadl_fetch in particular looks aliasing unsafe, let alone the rest.