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From: "slyfox at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [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
Date: Wed, 16 Aug 2023 21:24:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111009

--- Comment #9 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
Created attachment 55744
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D55744&action=3Dedit
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.=