[Bug middle-end/22141] [4.3/4.4/4.5/4.6/4.7 Regression] Missing optimization when storing structures

[Bug middle-end/22141] [4.3/4.4/4.5/4.6/4.7 Regression] Missing optimization when storing structures

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22141

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.3.6                       |4.4.7

--- Comment #22 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-06-27 12:14:38 UTC ---
4.3 branch is being closed, moving to 4.4.7 target.

[Bug middle-end/22141] [4.4/4.5/4.6/4.7 Regression] Missing optimization when storing structures

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22141

--- Comment #23 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-01-12 11:20:35 UTC ---
As we have MEM_REF available we can in theory do the combining on the
tree-level
as well (or during gimplification).  In fact, as we have the byteswap
detection pass which does not yet handle byte-swapping memory (thus, a
memory destination) it looks like a perfect place to handle this while
also fixing that deficiency (gather sources for a contiguous piecewise
stored memory region of suitable register size/alignment).

[Bug middle-end/22141] [4.5/4.6/4.7/4.8 Regression] Missing optimization when storing structures

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22141

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.4.7                       |4.5.4

--- Comment #24 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-03-13 12:48:09 UTC ---
4.4 branch is being closed, moving to 4.5.4 target.

[Bug middle-end/22141] [4.5/4.6/4.7/4.8 Regression] Missing optimization when storing structures

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22141

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |daniel.marjamaki at gmail
                   |                            |dot com

--- Comment #25 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-05-19 23:31:40 UTC ---
*** Bug 53417 has been marked as a duplicate of this bug. ***

[Bug middle-end/22141] [4.5/4.6/4.7/4.8 Regression] Missing optimization when storing structures

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22141

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.5.4                       |4.6.4

--- Comment #26 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-07-02 11:59:02 UTC ---
The 4.5 branch is being closed, adjusting target milestone.

[Bug middle-end/22141] [4.7/4.8/4.9 Regression] Missing optimization when storing structures

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22141

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.6.4                       |4.7.4

--- Comment #27 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-04-12 15:17:04 UTC ---
GCC 4.6.4 has been released and the branch has been closed.

[Bug middle-end/22141] [4.7/4.8/4.9/4.10 Regression] Missing optimization when storing structures

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=22141

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.7.4                       |4.8.4

--- Comment #28 from Richard Biener <rguenth at gcc dot gnu.org> ---
The 4.7 branch is being closed, moving target milestone to 4.8.4.

[Bug middle-end/22141] [4.8/4.9/5 Regression] Missing optimization when storing structures

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=22141

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.8.4                       |4.8.5

--- Comment #29 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 4.8.4 has been released.

[Bug middle-end/22141] [4.8/4.9/5 Regression] Missing optimization when storing structures

[hariharan.gcc at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=22141

hariharan.gcc at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hariharan.gcc at gmail dot com

--- Comment #30 from hariharan.gcc at gmail dot com ---
I saw a related problem, this time with bitfields

$more bitfieldtest.c

typedef union {
  struct {
    unsigned int b1:1;
    unsigned int b2:1;
    unsigned int b3:1;
    unsigned int b4:1;
    unsigned int b5:1;
  }fields;
  unsigned int word;
} _t_bitfields;


void _const_populate_bits(_t_bitfields * data)
{
  data->fields.b1 = 1;
  data->fields.b2 = 0;
  data->fields.b3 = 1;
  data->fields.b4 = 1;
  data->fields.b5 = 0;
}

At the end of tree stages, it looks like this

$more bitfieldtest.c.165t.optimized

;; Function _const_populate_bits (_const_populate_bits, funcdef_no=0,
decl_uid=1339, cgraph_uid=0)

_const_populate_bits (union _t_bitfields * data)
{
  <bb 2>:
  data_2(D)->fields.b1 = 1;
  data_2(D)->fields.b2 = 0;
  data_2(D)->fields.b3 = 1;
  data_2(D)->fields.b4 = 1;
  data_2(D)->fields.b5 = 0;
  return;

}

Expand expands each one of the assignments in turn and some get combined later
on into ok-ish code. It would be nice to be able to combine all 5 assignments
into one.

Its kind of related to this PR, but is it sufficiently different to warrant a
separate PR for it?

[Bug middle-end/22141] [4.8/4.9/5/6 Regression] Missing optimization when storing structures

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=22141

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.8.5                       |4.9.3

--- Comment #31 from Richard Biener <rguenth at gcc dot gnu.org> ---
The gcc-4_8-branch is being closed, re-targeting regressions to 4.9.3.

[Bug middle-end/22141] [4.9/5/6 Regression] Missing optimization when storing structures

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=22141

--- Comment #32 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 4.9.3 has been released.

[Bug middle-end/22141] [4.9/5/6 Regression] Missing optimization when storing structures

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=22141

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.9.3                       |4.9.4