[Bug middle-end/34450] New: [4.3 Regression] compile takes up 1.8 GB RAM at -O1

[Bug middle-end/34450] New: [4.3 Regression] compile takes up 1.8 GB RAM at -O1

[tbm at cyrius dot com]

Compile the attached source with -O1 and it will take roughly 1.8 GB RAM
on x86_64 and over a minute with current trunk.  4.2 took a few seconds
and less than 200 MB RAM.  Granted, this is with checking on because
I haven't had a chance to compile a version without checking, but this
still looks like a regression.  Hopefully someone (Richi?) can take a look.


-- 
           Summary: [4.3 Regression] compile takes up 1.8 GB RAM at -O1
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tbm at cyrius dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34450

[Bug middle-end/34450] [4.3 Regression] compile takes up 1.8 GB RAM at -O1

[tbm at cyrius dot com]

------- Comment #1 from tbm at cyrius dot com  2007-12-13 05:24 -------
Created an attachment (id=14741)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14741&action=view)
preprocessed source


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34450

[Bug middle-end/34450] [4.3 Regression] compile takes up 1.8 GB RAM at -O1

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2007-12-13 10:29 -------
I can confirm this.

 tree FRE              :  22.25 (56%) usr   1.35 (60%) sys  23.67 (56%) wall
3202543 kB (92%) ggc

fpica() get's very large and complex.  We have very many SFTs and one giant SCC
(with around 127000 members(!)).


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dberlin at gcc dot gnu dot
                   |                            |org, rguenth at gcc dot gnu
                   |                            |dot org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|                            |compile-time-hog, memory-hog
   Last reconfirmed|0000-00-00 00:00:00         |2007-12-13 10:29:25
               date|                            |
   Target Milestone|---                         |4.3.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34450

[Bug middle-end/34450] [4.3 Regression] compile takes up 1.8 GB RAM at -O1

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2007-12-13 10:56 -------
I have a patch.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |rguenth at gcc dot gnu dot
                   |dot org                     |org
             Status|NEW                         |ASSIGNED
   Last reconfirmed|2007-12-13 10:29:25         |2007-12-13 10:56:22
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34450

[Bug middle-end/34450] [4.3 Regression] compile takes up 1.8 GB RAM at -O1

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2007-12-13 13:05 -------
--param max-fields-for-field-sensitive=1  is a workaround available.

Patch: http://gcc.gnu.org/ml/gcc-patches/2007-12/msg00583.html


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34450

[Bug middle-end/34450] [4.3 Regression] compile takes up 1.8 GB RAM at -O1

[rguenth at gcc dot gnu dot org]

------- Comment #5 from rguenth at gcc dot gnu dot org  2007-12-13 14:22 -------
Subject: Bug 34450

Author: rguenth
Date: Thu Dec 13 14:22:23 2007
New Revision: 130895

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=130895
Log:
2007-12-13  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/34450
        * params.def (PARAM_SCCVN_MAX_SCC_SIZE): New param.
        * invoke.texi (sccvn-max-scc-size): Document.
        * Makefile.in (tree-ssa-sccvn.o): Add $(PARAMS_H) dependency.
        * tree-ssa-sccvn.h (run_scc_vn): Return true on success, false
        on error.
        * tree-ssa-sccvn.c (params.h): Include.
        (DFS): Return true if all went well, return false as soon as
        a SCC exceeds the size of PARAM_SCCVN_MAX_SCC_SIZE.
        (run_scc_vn): Return true if all went well, return false if
        we aborted during DFS.
        * tree-ssa-pre.c (execute_pre): Check if SCCVN finished
        successfully, otherwise bail out.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/Makefile.in
    trunk/gcc/doc/invoke.texi
    trunk/gcc/params.def
    trunk/gcc/tree-ssa-pre.c
    trunk/gcc/tree-ssa-sccvn.c
    trunk/gcc/tree-ssa-sccvn.h


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34450

[Bug middle-end/34450] [4.3 Regression] compile takes up 1.8 GB RAM at -O1

[rguenth at gcc dot gnu dot org]

------- Comment #6 from rguenth at gcc dot gnu dot org  2007-12-13 14:27 -------
Fixed.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34450