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From: "xgchenshy at 126 dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/106635] AARCH64 STUR instruction causes bus error
Date: Tue, 16 Aug 2022 08:36:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106635

--- Comment #4 from Xiaoguang <xgchenshy at 126 dot com> ---
(In reply to Xiaoguang from comment #2)
> (In reply to Richard Biener from comment #1)
> > Can you provide preprocessed source of the whole translation unit so the
> > testcase is compilable?
>=20
> Sure, please see below complete code.
>=20
> void CWLCollectReadRegData(u32* dst,u16 reg_start, u32 reg_length,u32*
> total_length, addr_t status_data_base_addr)
> {
>   u32 data_length=3D0;
>   {
>     //opcode
>     *dst++ =3D (OPCODE_RREG<<27)|(reg_length<<16)|(reg_start*4);
>     data_length++;
>=20=20
>     //data
>     volatile u32 temp_32 =3D (u32)status_data_base_addr; // fix compiler
> optimization -O2 bug:  stur  x4, [x0, #4]
>     *dst++ =3D temp_32;
>     data_length++;
>=20=20
>     if(sizeof(addr_t) =3D=3D 8) {
>       *dst++ =3D (u32)(((u64)status_data_base_addr)>>32);
>       data_length++;
>     } else {
>       *dst++ =3D 0;
>       data_length++;
>     }
>     //alignment
>     *dst =3D 0;
>     data_length++;
>=20=20
>     *total_length =3D data_length;
>   }
> }

please ignore this, we added volatile to avoid such issue=