[Bug c/65088] New: Does GCC has load/store widening phase?

[Bug c/65088] New: Does GCC has load/store widening phase?

[m.zakirov at samsung dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65088

            Bug ID: 65088
           Summary: Does GCC has load/store widening phase?
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: m.zakirov at samsung dot com

This example says me that it doesn't.

$ cat t2.c

int a[2];
int b[2];

int main ()
{
  b[0] = a[0];
  b[1] = a[1];
  return 0;
}

$ gcc t2.c -O3 -S

$ cat t2.s

...

main:
.LFB0:
    .cfi_startproc
    movl    a(%rip), %eax
    movl    %eax, b(%rip)
    movl    a+4(%rip), %eax
    movl    %eax, b+4(%rip)
    xorl    %eax, %eax
    ret
    .cfi_endproc

gcc version is:

commit 71464ecd3a554b889c3bbc53d8874fc532bdf953
Author: trippels <trippels@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Mon Jan 12 07:53:10 2015 +0000

[Bug c/65088] Does GCC has load/store widening phase?

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65088

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
See bug 23684.

[Bug c/65088] Does GCC has load/store widening phase?

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65088

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |mpolacek at gcc dot gnu.org
         Resolution|---                         |INVALID

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I think this has been discussed on the gcc mailing list.

[Bug c/65088] Does GCC has load/store widening phase?

[m.zakirov at samsung dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65088

--- Comment #3 from Marat Zakirov <m.zakirov at samsung dot com> ---
> I think this has been discussed on the gcc mailing list

Marek could you please share some resuting conclusion at least for x86
platform?
Why didn't x86 GCC RTL fold these loads/stores?