[Bug other/38768] New: man page: -fschedule-insns documentation

[Bug other/38768] New: man page: -fschedule-insns documentation

[tim at klingt dot org]

according to the manpage, -fschedule-insns is enabled at the optimization
levels -O2, -O3 and -Os. according to g++ -c -Q --help=optimizers, this is not
the case, though.


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           Summary: man page: -fschedule-insns documentation
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tim at klingt dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38768

[Bug other/38768] man page: -fschedule-insns documentation

[tim at klingt dot org]

------- Comment #1 from tim at klingt dot org  2009-01-08 17:44 -------
Created an attachment (id=17057)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=17057&action=view)
proposed patch


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38768

[Bug other/38768] man page: -fschedule-insns documentation

[pinskia at gmail dot com]

------- Comment #2 from pinskia at gmail dot com  2009-01-08 18:27 -------
Subject: Re:  man page: -fschedule-insns documentation



On Jan 8, 2009, at 9:44 AM, "tim at klingt dot org" <gcc-bugzilla@gcc.gnu.org 
 > wrote:

>
>
> ------- Comment #1 from tim at klingt dot org  2009-01-08 17:44  
> -------
> Created an attachment (id=17057)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=17057&action=view)
> --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=17057&action=view)
> proposed patch


This patch is incorrect as -fschedule-insns is enabled at -O2 and  
above for most targets except for x86.

>
>
>
> -- 
>
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38768
>


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38768

Re: [Bug other/38768] man page: -fschedule-insns documentation

[Andrew Thomas Pinski]

On Jan 8, 2009, at 9:44 AM, "tim at klingt dot org" <gcc-bugzilla@gcc.gnu.org 
 > wrote:

>
>
> ------- Comment #1 from tim at klingt dot org  2009-01-08 17:44  
> -------
> Created an attachment (id=17057)
> --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=17057&action=view)
> proposed patch


This patch is incorrect as -fschedule-insns is enabled at -O2 and  
above for most targets except for x86.

>
>
>
> -- 
>
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38768
>

[Bug other/38768] man page: -fschedule-insns documentation

[tim at klingt dot org]

------- Comment #3 from tim at klingt dot org  2009-01-08 18:30 -------
> This patch is incorrect as -fschedule-insns is enabled at -O2 and  
> above for most targets except for x86.

and x86_64 ... the only platforms i can use for testing ...


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38768

[Bug other/38768] -fschedule-insns documentation is wrong for x86 and some other targets

[pinskia at gcc dot gnu dot org]

------- Comment #4 from pinskia at gcc dot gnu dot org  2009-01-09 20:22 -------
Confirmed.  Also note -fschedule-insns is basically broken for x86 anyways.


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pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pinskia at gcc dot gnu dot
                   |                            |org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|                            |documentation
   Last reconfirmed|0000-00-00 00:00:00         |2009-01-09 20:22:48
               date|                            |
            Summary|man page: -fschedule-insns  |-fschedule-insns
                   |documentation               |documentation is wrong for
                   |                            |x86 and some other targets


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38768

[Bug other/38768] -fschedule-insns documentation is wrong for x86 and some other targets

[reza dot yazdani at amd dot com]

------- Comment #5 from reza dot yazdani at amd dot com  2010-01-14 22:12 -------
> Confirmed.  Also note -fschedule-insns is basically broken for x86 anyways.
> 

Do you have a list of bug reports where -fschedule-insns is broken on x86?
We tried to compile all the SPEC 2006 with this option and there are no
errors in there.


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reza dot yazdani at amd dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenth at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38768

[Bug other/38768] -fschedule-insns documentation is wrong for x86 and some other targets

[hjl dot tools at gmail dot com]

------- Comment #6 from hjl dot tools at gmail dot com  2010-01-15 03:31 -------
(In reply to comment #5)
> > Confirmed.  Also note -fschedule-insns is basically broken for x86 anyways.
> > 
> 
> Do you have a list of bug reports where -fschedule-insns is broken on x86?
> We tried to compile all the SPEC 2006 with this option and there are no
> errors in there.
> 

Did you really use -fschedule-insns on SPEC CPU 2006 on 32bit?


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hjl dot tools at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hjl dot tools at gmail dot
                   |                            |com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38768

[Bug other/38768] -fschedule-insns documentation is wrong for x86 and some other targets

[rguenther at suse dot de]

------- Comment #7 from rguenther at suse dot de  2010-01-15 09:46 -------
Subject: Re:  -fschedule-insns documentation is wrong for
 x86 and some other targets

On Thu, 14 Jan 2010, reza dot yazdani at amd dot com wrote:

> ------- Comment #5 from reza dot yazdani at amd dot com  2010-01-14 22:12 -------
> > Confirmed.  Also note -fschedule-insns is basically broken for x86 anyways.
> > 
> 
> Do you have a list of bug reports where -fschedule-insns is broken on x86?
> We tried to compile all the SPEC 2006 with this option and there are no
> errors in there.

24319, 38403, 42295, etc.  (that's from a -fschedule-insns search)
or walk through 
http://gcc.gnu.org/bugzilla/buglist.cgi?query_format=advanced&short_desc_type=allwordssubstr&short_desc=&known_to_fail_type=allwordssubstr&known_to_work_type=allwordssubstr&long_desc_type=substring&long_desc=unable+to+find+a+register+to+spill&bug_file_loc_type=allwordssubstr&bug_file_loc=&gcchost_type=allwordssubstr&gcchost=&gcctarget_type=allwordssubstr&gcctarget=&gccbuild_type=allwordssubstr&gccbuild=&keywords_type=allwords&keywords=&bug_status=UNCONFIRMED&bug_status=NEW&bug_status=ASSIGNED&bug_status=SUSPENDED&bug_status=WAITING&bug_status=REOPENED&emailassigned_to1=1&emailtype1=substring&email1=&emailassigned_to2=1&emailreporter2=1&emailcc2=1&emailtype2=substring&email2=&bugidtype=include&bug_id=&votes=&chfieldfrom=&chfieldto=Now&chfieldvalue=&cmdtype=doit&order=Reuse+same+sort+as+last+time&field0-0-0=noop&type0-0-0=noop&value0-0-0=

basically the issue is increasing register pressure and failure to
do register allocation after that.  In 4.5 -fsched-pressure might
fix some of them.

Richard.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38768

[Bug other/38768] -fschedule-insns documentation is wrong for x86 and some other targets

[reza dot yazdani at amd dot com]

------- Comment #8 from reza dot yazdani at amd dot com  2010-01-15 15:19 -------
We used -O2 -fsched-pressure -fschedule-insns to build the cpu2006 bmks on an
amd64-linux machine.

Thanks for the list of bugs.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38768