[Bug middle-end/111009] [12/13/14 regression] -fno-strict-overflow erroneously elides null pointer checks and causes SIGSEGV on perf from linux-6.4.10

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111009

--- Comment #9 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
Created attachment 55744
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55744&action=edit
bug.S

At the hazard of stating the obvious: it's a wrong-code when you execute it
(not a gcc ICE).

Should fail on vanilla x86_64-linux-gnu. Tested on today's
r14-3254-g9ade70bb86c874 as:

    $ gcc -Bgcc bug.c.c -fno-strict-overflow -O3 -o bug && ./bug
    Segmentation fault (core dumped)

I also uploaded bug.S as an output of

    $ gcc -Bgcc bug.c.c -fno-strict-overflow -O3 -S -fverbose-asm -o bug.S

if it helps you to find why your output is different.