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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/109821] vect: Different output with -O2
 -ftree-loop-vectorize compared to -O2
Date: Fri, 12 May 2023 03:42:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109821

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Using:
typedef uint64_t ua64_t __attribute__((aligned(1), may_alias));

#define UNALIGNED_LOAD64(_p) (*reinterpret_cast<const ua64_t *>(_p))
#define UNALIGNED_STORE64(_p, _val) (*reinterpret_cast<ua64_t *>(_p) =3D (_=
val))


Does fix the "bug" too. Though not the buffer overflow.
increasing src to 100 bytes fixes that.=