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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/108695] [13 Regression] Wrong code since
 r13-5215-gb1f30bf42d8d47 for dd_rescue package
Date: Wed, 08 Feb 2023 15:18:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108695

Martin Li=C5=A1ka <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|WAITING                     |RESOLVED

--- Comment #10 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
> where the XOR16 is implemented as:
>=20
> #define XORN(in1,in2,out,len)	\
> do {				\
> 	uint _i;		\
> 	for (_i =3D 0; _i < len/sizeof(ulong); ++_i)	\
> 		*((ulong*)(out)+_i) =3D *((ulong*)(in1)+_i) ^ *((ulong*)(in2)+_i);	\
> } while(0)

I can confirm that changing that to:

#define XORN(in1, in2, out, len)                  \
        do                                            \
        {                                             \
                uint _i;                                  \
                for (_i =3D 0; _i < len; ++_i)              \
                        *(out + _i) =3D *(in1 + _i) ^ *(in2 + _i); \
        } while (0)

fixes the problem. It seems very close to what I saw here:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D83201#c13=