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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 08:34:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106635

--- Comment #2 from Xiaoguang <xgchenshy at 126 dot com> ---
(In reply to Richard Biener from comment #1)
> Can you provide preprocessed source of the whole translation unit so the
> testcase is compilable?

Sure, please see below complete code.

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++;

    //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++;

    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++;

    *total_length =3D data_length;
  }
}=