[Bug pending/39657] New: [4.3 Regression] compiling ruby (yacc) output takes inordinate amount of time on x86 with -O2

[Bug pending/39657] New: [4.3 Regression] compiling ruby (yacc) output takes inordinate amount of time on x86 with -O2

[vapier at gentoo dot org]

gcc 4.1, 4.2, and 4.4 all take less than 30 seconds to compile this file.  but
gcc-4.3 can easily take more like 5 minutes.

the file comes from the preprocessed output of a file in the ruby package.


-- 
           Summary: [4.3 Regression] compiling ruby (yacc) output takes
                    inordinate amount of time on x86 with -O2
           Product: gcc
           Version: 4.3.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: pending
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: vapier at gentoo dot org
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39657

[Bug pending/39657] [4.3 Regression] compiling ruby (yacc) output takes inordinate amount of time on x86 with -O2

[vapier at gentoo dot org]

------- Comment #1 from vapier at gentoo dot org  2009-04-06 00:50 -------
Created an attachment (id=17592)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=17592&action=view)
parse_.i

$ time gcc -c -O2 parse_.i
real    5m16.777s
user    5m14.586s
sys     0m1.545s


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39657

[Bug tree-optimization/39657] [4.3 Regression] compiling ruby (yacc) output takes inordinate amount of time on x86 with -O2

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2009-04-06 09:39 -------
 tree PRE              : 362.75 (97%) usr   3.30 (80%) sys 366.55 (97%) wall   
7515 kB ( 8%) ggc

So you can use -fno-tree-pre to work around this issue or limit the size
of the SCCs processed (with the same effect) with the --param
sccvn-max-scc-size


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
          Component|pending                     |tree-optimization
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2009-04-06 09:39:39
               date|                            |
   Target Milestone|---                         |4.3.4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39657

[Bug tree-optimization/39657] [4.3 Regression] compiling ruby (yacc) output takes inordinate amount of time with PRE and large SCCs

[rguenth at gcc dot gnu dot org]

-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2
            Summary|[4.3 Regression] compiling  |[4.3 Regression] compiling
                   |ruby (yacc) output takes    |ruby (yacc) output takes
                   |inordinate amount of time on|inordinate amount of time
                   |x86 with -O2                |with PRE and large SCCs


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39657

[Bug tree-optimization/39657] [4.3 Regression] compiling ruby (yacc) output takes inordinate amount of time with PRE and large SCCs

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2009-08-04 12:30 -------
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=39657

[Bug tree-optimization/39657] [4.3 Regression] compiling ruby (yacc) output takes inordinate amount of time with PRE and large SCCs

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2010-04-27 11:17 -------
WONTFIX on the 4.3 branch.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
      Known to fail|4.3.2 4.3.3                 |4.3.2 4.3.3 4.3.5
         Resolution|                            |FIXED
   Target Milestone|4.3.5                       |4.4.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39657