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From: "josephcsible at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/96235] Segmentation fault with "-Og -fno-dce -fno-tree-dce
 -finline-small-functions -fipa-sra"
Date: Mon, 20 Jul 2020 15:58:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96235

Joseph C. Sible <josephcsible at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |josephcsible at gmail dot =
com

--- Comment #2 from Joseph C. Sible <josephcsible at gmail dot com> ---
I can reproduce it on godbolt ("Program returned: 139"):
https://godbolt.org/z/c7eYzx

Here's the assembly output:

main:
        movslq  b(%rip), %rax
        cmpq    0, %rax
        cmpq    $0, d(%rip)
        movl    $0, %eax
        ret
c:
        .quad   1
d:
        .quad   1
b:
        .long   1

The problem is that "cmpq    0, %rax" tries to read memory at address 0.=