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* [Bug rtl-optimization/52000] New: cross-jumping drops MEM attributes even when it makes no changes to the code
@ 2012-01-25 19:29 rsandifo at gcc dot gnu.org
  2012-01-25 19:44 ` [Bug rtl-optimization/52000] " pinskia at gcc dot gnu.org
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: rsandifo at gcc dot gnu.org @ 2012-01-25 19:29 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52000

             Bug #: 52000
           Summary: cross-jumping drops MEM attributes even when it makes
                    no changes to the code
    Classification: Unclassified
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: rsandifo@gcc.gnu.org


flow_find_cross_jump calls merge_memattrs for each pair of
instructions that it was thinking of merging, regardless of
whether the merge takes place.  This can cause mem attributes
to be dropped unnecessarily.  See:

    http://gcc.gnu.org/ml/gcc/2012-01/msg00015.html

for more discussion and context.


^ permalink raw reply	[flat|nested] 4+ messages in thread
* [Bug rtl-optimization/52000] cross-jumping drops MEM attributes even when it makes no changes to the code
  2012-01-25 19:29 [Bug rtl-optimization/52000] New: cross-jumping drops MEM attributes even when it makes no changes to the code rsandifo at gcc dot gnu.org
@ 2012-01-25 19:44 ` pinskia at gcc dot gnu.org
  2012-01-26 13:25 ` rguenth at gcc dot gnu.org
  2021-12-18 23:15 ` pinskia at gcc dot gnu.org
  2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2012-01-25 19:44 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52000

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-01-25
     Ever Confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-01-25 19:20:48 UTC ---
Confirmed.


^ permalink raw reply	[flat|nested] 4+ messages in thread
* [Bug rtl-optimization/52000] cross-jumping drops MEM attributes even when it makes no changes to the code
  2012-01-25 19:29 [Bug rtl-optimization/52000] New: cross-jumping drops MEM attributes even when it makes no changes to the code rsandifo at gcc dot gnu.org
  2012-01-25 19:44 ` [Bug rtl-optimization/52000] " pinskia at gcc dot gnu.org
@ 2012-01-26 13:25 ` rguenth at gcc dot gnu.org
  2021-12-18 23:15 ` pinskia at gcc dot gnu.org
  2 siblings, 0 replies; 4+ messages in thread
From: rguenth at gcc dot gnu.org @ 2012-01-26 13:25 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52000

--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-01-26 11:21:33 UTC ---
It also calls merge_notes (so I suppose might drop REG_EQUAL notes).

Both should be delayed to commit time.


^ permalink raw reply	[flat|nested] 4+ messages in thread
* [Bug rtl-optimization/52000] cross-jumping drops MEM attributes even when it makes no changes to the code
  2012-01-25 19:29 [Bug rtl-optimization/52000] New: cross-jumping drops MEM attributes even when it makes no changes to the code rsandifo at gcc dot gnu.org
  2012-01-25 19:44 ` [Bug rtl-optimization/52000] " pinskia at gcc dot gnu.org
  2012-01-26 13:25 ` rguenth at gcc dot gnu.org
@ 2021-12-18 23:15 ` pinskia at gcc dot gnu.org
  2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-12-18 23:15 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52000

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement

^ permalink raw reply	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2021-12-18 23:15 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-01-25 19:29 [Bug rtl-optimization/52000] New: cross-jumping drops MEM attributes even when it makes no changes to the code rsandifo at gcc dot gnu.org
2012-01-25 19:44 ` [Bug rtl-optimization/52000] " pinskia at gcc dot gnu.org
2012-01-26 13:25 ` rguenth at gcc dot gnu.org
2021-12-18 23:15 ` pinskia at gcc dot gnu.org

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