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From: "xry111 at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/113727] csmith: differences from nothing to -O1
Date: Sat, 03 Feb 2024 10:11:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113727

Xi Ruoyao <xry111 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |xry111 at gcc dot gnu.org
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=3D109982

--- Comment #8 from Xi Ruoyao <xry111 at gcc dot gnu.org> ---
#pragma pack(push)
#pragma pack(1)
struct S0 {=20
   signed f0 : 22;
   uint32_t f1;
   unsigned f2 : 5;=20
   unsigned f3 : 21;
   unsigned f4 : 8;=20
   signed f5 : 22;
   signed f6 : 1;=20
   signed f7 : 23;
   signed f8 : 10;
};
#pragma pack(pop)

Removing these #pragma silence the UBSan.  But I bet the code is just inval=
id
with those #pragma and with #pragma removed the issue will just gone, like
PR109982.=