[Bug c/99890] New: The -mstrict-aglign doesn't support the ARM targets

[Bug c/99890] New: The -mstrict-aglign doesn't support the ARM targets

[zmin1 at avic dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99890

            Bug ID: 99890
           Summary: The -mstrict-aglign doesn't support the ARM targets
           Product: gcc
           Version: 4.8.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zmin1 at avic dot com
  Target Milestone: ---

When I use the PowerPC targets, the -mstrict-align options is very useful, it
can force the structs and datas to align with 4bytes rules。
But why the ARM targets doesn't support this options？

[Bug target/99890] The -mstrict-aglign doesn't support the ARM targets

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99890

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c                           |target

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Because it is a target specific option.
What exactly are you trying to do?

most instructions in ARMv7+ support unaligned data.

[Bug target/99890] The -mstrict-aglign doesn't support the ARM targets

[zmin1 at avic dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99890

--- Comment #2 from ZhangMin <zmin1 at avic dot com> ---
(In reply to Andrew Pinski from comment #1)
> Because it is a target specific option.
> What exactly are you trying to do?
> 
> most instructions in ARMv7+ support unaligned data.

Although armv7 + supports non aligned data access, our application requires
data aligned access.
On PowerPC, we can achieve the goal well by using - mstrict align option, but
not on arm.
Is there any other way to solve this problem?

[Bug target/99890] The -mstrict-aglign doesn't support the ARM targets

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99890

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2021-04-04

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
What exactly are you looking for? What does the code look like and what exact
target are you using?

Also GCC 4.8.1 is over 6 years old, can you try a newer GCC?

[Bug target/99890] The -mstrict-align doesn't support the ARM targets

[rearnsha at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99890

Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:

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

--- Comment #4 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Try -mno-unaligned-access