[Bug tree-optimization/27004] New: [4.1/4.2 Regression] Insane amount of memory needed at -O1 and above because of salias

[Bug tree-optimization/27004] New: [4.1/4.2 Regression] Insane amount of memory needed at -O1 and above because of salias

[bonzini at gnu dot org]

spinning a separate bug from PR26830.  we are creating a lot of field memory
tags, each of which is present in a 900-argument phi, which causes us to use
more memory than 4.0.

to some extent this is unavoidable, but I wonder if we could throttle things
down a bit?


-- 
           Summary: [4.1/4.2 Regression] Insane amount of memory needed at -
                    O1 and above because of salias
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: memory-hog, alias
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: bonzini at gnu dot org
 BugsThisDependsOn: 26830


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27004

[Bug tree-optimization/27004] [4.1/4.2 Regression] Insane amount of memory needed at -O1 and above because of salias

[dberlin at dberlin dot org]

------- Comment #1 from dberlin at gcc dot gnu dot org  2006-04-03 14:37 -------
Subject: Re:   New: [4.1/4.2 Regression]
        Insane amount of memory needed at -O1 and above because of salias

On Mon, 2006-04-03 at 13:43 +0000, bonzini at gnu dot org wrote:
> spinning a separate bug from PR26830.  we are creating a lot of field memory
> tags, each of which is present in a 900-argument phi, which causes us to use
> more memory than 4.0.
> 
> to some extent this is unavoidable, but I wonder if we could throttle things
> down a bit?
> 

Err, why do we have a 900 argument phi?
Seems a bit large.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27004

[Bug tree-optimization/27004] [4.1/4.2 Regression] Insane amount of memory needed at -O1 and above because of salias

[rguenther at suse dot de]

------- Comment #2 from rguenther at suse dot de  2006-04-03 14:39 -------
Subject: Re:  [4.1/4.2 Regression] Insane amount
 of memory needed at -O1 and above because of salias

On Mon, 3 Apr 2006, dberlin at dberlin dot org wrote:

> On Mon, 2006-04-03 at 13:43 +0000, bonzini at gnu dot org wrote:
> > spinning a separate bug from PR26830.  we are creating a lot of field memory
> > tags, each of which is present in a 900-argument phi, which causes us to use
> > more memory than 4.0.
> > 
> > to some extent this is unavoidable, but I wonder if we could throttle things
> > down a bit?
> > 
> 
> Err, why do we have a 900 argument phi?
> Seems a bit large.

Because the testcase is - err - interesting.

Richard.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27004

[Bug tree-optimization/27004] [4.1/4.2 Regression] Insane amount of memory needed at -O1 and above because of salias and large switch

[pinskia at gcc dot gnu dot org]

-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[4.1/4.2 Regression] Insane |[4.1/4.2 Regression] Insane
                   |amount of memory needed at -|amount of memory needed at -
                   |O1 and above because of     |O1 and above because of
                   |salias                      |salias and large switch
   Target Milestone|---                         |4.1.1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27004

[Bug tree-optimization/27004] [4.1/4.2 Regression] Insane amount of memory needed at -O1 and above because of salias and large switch

[mmitchel at gcc dot gnu dot org]

-- 

mmitchel at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27004

[Bug tree-optimization/27004] [4.1/4.2 Regression] Insane amount of memory needed at -O1 and above because of salias and large switch

[mmitchel at gcc dot gnu dot org]

------- Comment #3 from mmitchel at gcc dot gnu dot org  2006-05-25 02:34 -------
Will not be fixed in 4.1.1; adjust target milestone to 4.1.2.


-- 

mmitchel at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.1.1                       |4.1.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27004

[Bug tree-optimization/27004] [4.1/4.2/4.3 Regression] Insane amount of memory needed at -O1 and above because of salias and large switch

[mmitchel at gcc dot gnu dot org]

-- 

mmitchel at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.1.2                       |4.1.3


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27004

[Bug tree-optimization/27004] [4.1/4.2/4.3 Regression] Insane amount of memory needed at -O1 and above because of salias and large switch

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2007-11-04 12:47 -------
If you solve the SFT problem, DF needs lot of memory and compile-time in this
testcase on the trunk.  The execute() function has lots of basic blocks with
a high number of incoming edges.

So, I have a patch for the SFT problem.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2007-11-04 12:47:36
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27004

[Bug tree-optimization/27004] [4.1/4.2/4.3 Regression] Insane amount of memory needed at -O1 and above because of salias and large switch

[rguenth at gcc dot gnu dot org]

------- Comment #5 from rguenth at gcc dot gnu dot org  2007-11-04 13:34 -------
Some numbers (-O):

4.0.4 needs 596MB peak
4.1.2 needs 2GB peak (and a lot of time)
4.2.2 same as 4.1.2
4.3.0 same as 4.2.2


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27004

[Bug tree-optimization/27004] [4.1/4.2/4.3 Regression] Insane amount of memory needed at -O1 and above because of salias and large switch

[rguenth at gcc dot gnu dot org]

------- Comment #6 from rguenth at gcc dot gnu dot org  2007-11-04 13:38 -------
Created an attachment (id=14483)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14483&action=view)
patch

Patch to limit the number of SFTs created per function.  The limit of 1000 SFTs
brings down memory usage to 1.3GB, a limit of 500 to 1.2GB, a limit of 100
results in 970MB, a limit of
zero 954MB.

So there's still something taking 400MB more memory than in 4.0.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27004

[Bug tree-optimization/27004] [4.2/4.3/4.4 Regression] Insane amount of memory needed at -O1 and above because of salias and large switch

[jsm28 at gcc dot gnu dot org]

------- Comment #7 from jsm28 at gcc dot gnu dot org  2008-07-04 20:23 -------
Closing 4.1 branch.


-- 

jsm28 at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[4.1/4.2/4.3/4.4 Regression]|[4.2/4.3/4.4 Regression]
                   |Insane amount of memory     |Insane amount of memory
                   |needed at -O1 and above     |needed at -O1 and above
                   |because of salias and large |because of salias and large
                   |switch                      |switch
   Target Milestone|4.1.3                       |4.2.5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27004

[Bug tree-optimization/27004] [4.2/4.3/4.4 Regression] Insane amount of memory needed at -O1 and above because of salias and large switch

[jakub at gcc dot gnu dot org]

------- Comment #8 from jakub at gcc dot gnu dot org  2008-12-08 14:41 -------
It is unclear which target this was tested on, in any case current trunk tops
on this at around 1.2GB.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27004

[Bug tree-optimization/27004] [4.2/4.3 Regression] Insane amount of memory needed at -O1 and above because of salias and large switch

[rguenth at gcc dot gnu dot org]

------- Comment #9 from rguenth at gcc dot gnu dot org  2008-12-08 14:47 -------
I think this is a dup of PR26854 on the trunk at least - the excess memory used
is used by DF (SFTs are gone on the trunk).

So, this is now a 4.2/4.3 regression only (which still have SFTs).


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  BugsThisDependsOn|                            |26854
            Summary|[4.2/4.3/4.4 Regression]    |[4.2/4.3 Regression] Insane
                   |Insane amount of memory     |amount of memory needed at -
                   |needed at -O1 and above     |O1 and above because of
                   |because of salias and large |salias and large switch
                   |switch                      |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27004

[Bug tree-optimization/27004] [4.3 Regression] Insane amount of memory needed at -O1 and above because of salias and large switch

[jsm28 at gcc dot gnu dot org]

------- Comment #10 from jsm28 at gcc dot gnu dot org  2009-03-31 19:33 -------
Closing 4.2 branch.


-- 

jsm28 at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[4.2/4.3 Regression] Insane |[4.3 Regression] Insane
                   |amount of memory needed at -|amount of memory needed at -
                   |O1 and above because of     |O1 and above because of
                   |salias and large switch     |salias and large switch
   Target Milestone|4.2.5                       |4.3.4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27004

[Bug tree-optimization/27004] [4.3 Regression] Insane amount of memory needed at -O1 and above because of salias and large switch

[rguenth at gcc dot gnu dot org]

------- Comment #11 from rguenth at gcc dot gnu dot org  2009-08-04 12:27 -------
GCC 4.3.4 is being released, adjusting target milestone.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.3.4                       |4.3.5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27004

[Bug tree-optimization/27004] [4.3 Regression] Insane amount of memory needed at -O1 and above because of salias and large switch

[rguenth at gcc dot gnu dot org]

------- Comment #12 from rguenth at gcc dot gnu dot org  2010-04-20 13:22 -------
WONTFIX on the branch.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
      Known to fail|                            |4.3.4
      Known to work|                            |4.4.0
         Resolution|                            |FIXED
   Target Milestone|4.3.5                       |4.4.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27004