public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug optimization/12419] New: Performace regression: poor optimization of const memory
@ 2003-09-26 14:55 aph at gcc dot gnu dot org
  2003-09-26 14:56 ` [Bug optimization/12419] " aph at gcc dot gnu dot org
                   ` (24 more replies)
  0 siblings, 25 replies; 26+ messages in thread
From: aph at gcc dot gnu dot org @ 2003-09-26 14:55 UTC (permalink / raw)
  To: gcc-bugs

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419

           Summary: Performace regression: poor optimization of const memory
           Product: gcc
           Version: 3.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: aph at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org

This program:

extern const int a[];
extern void f();

int foo ()
{
  int n = a[0]; 
  f();
  n += a[0];
  return n;
}

generates this code:

foo:
        pushl   %ebx
        subl    $8, %esp
        movl    a, %ebx
        call    f
        movl    a, %eax
        addl    $8, %esp
        addl    %eax, %ebx
        movl    %ebx, %eax
        popl    %ebx
        ret

Note that the memory 'a' is read twice.  3.2 did this:

foo:
        pushl   %ebx
        subl    $8, %esp
        movl    a, %ebx
        sall    $1, %ebx
        call    f
        addl    $8, %esp
        movl    %ebx, %eax
        popl    %ebx
        ret


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug optimization/12419] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
@ 2003-09-26 14:56 ` aph at gcc dot gnu dot org
  2003-09-26 18:35 ` bangerth at dealii dot org
                   ` (23 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: aph at gcc dot gnu dot org @ 2003-09-26 14:56 UTC (permalink / raw)
  To: gcc-bugs

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419


aph at gcc dot gnu dot org changed:

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


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug optimization/12419] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
  2003-09-26 14:56 ` [Bug optimization/12419] " aph at gcc dot gnu dot org
@ 2003-09-26 18:35 ` bangerth at dealii dot org
  2003-09-27  8:12 ` [Bug optimization/12419] [3.3/3.4 Regression] " pinskia at gcc dot gnu dot org
                   ` (22 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: bangerth at dealii dot org @ 2003-09-26 18:35 UTC (permalink / raw)
  To: gcc-bugs

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419



------- Additional Comments From bangerth at dealii dot org  2003-09-26 18:03 -------
Discussion about this is here:
  http://gcc.gnu.org/ml/gcc/2003-09/msg01125.html


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug optimization/12419] [3.3/3.4 Regression] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
  2003-09-26 14:56 ` [Bug optimization/12419] " aph at gcc dot gnu dot org
  2003-09-26 18:35 ` bangerth at dealii dot org
@ 2003-09-27  8:12 ` pinskia at gcc dot gnu dot org
  2003-09-29 23:07 ` janis187 at us dot ibm dot com
                   ` (21 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2003-09-27  8:12 UTC (permalink / raw)
  To: gcc-bugs

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419


pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |critical
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
           Keywords|                            |pessimizes-code
   Last reconfirmed|0000-00-00 00:00:00         |2003-09-27 06:36:21
               date|                            |
            Summary|Performace regression: poor |[3.3/3.4 Regression]
                   |optimization of const memory|Performace regression: poor
                   |                            |optimization of const memory
   Target Milestone|---                         |3.4


------- Additional Comments From pinskia at gcc dot gnu dot org  2003-09-27 06:36 -------
I can confirm this on the mainline (20030925) and in 3.3.2 (20030815).  It does not 
happen in 3.3 (20030304).


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug optimization/12419] [3.3/3.4 Regression] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (2 preceding siblings ...)
  2003-09-27  8:12 ` [Bug optimization/12419] [3.3/3.4 Regression] " pinskia at gcc dot gnu dot org
@ 2003-09-29 23:07 ` janis187 at us dot ibm dot com
  2003-09-29 23:15 ` pinskia at gcc dot gnu dot org
                   ` (20 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: janis187 at us dot ibm dot com @ 2003-09-29 23:07 UTC (permalink / raw)
  To: gcc-bugs

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419



------- Additional Comments From janis187 at us dot ibm dot com  2003-09-29 22:42 -------
The change reported in PR 12419 is somewhat erratic, although a
regression hunt on the 3.3 branch identified this patch:

--- gcc/gcc/ChangeLog ---

2003-04-07  Glen Nakamura  <glen@imodulo.com>

          PR opt/8634
          * explow.c (maybe_set_unchanging): Don't flag non-static const
          aggregate type initializers with RTX_UNCHANGING_P.

which includes the following new comment text:

       We cannot do this for non-static aggregates, because of the double
       writes that can be generated by store_constructor, depending on the
       contents of the initializer.  Yes, this does eliminate a good fraction
       of the number of uses of RTX_UNCHANGING_P for a language like Ada.
       It also eliminates a good quantity of bugs.  Let this be incentive to
       eliminate RTX_UNCHANGING_P entirely in favour of a more reliable
       solution, perhaps based on alias sets.

The regression hunt on the 3.3-branch took place on i686-pc-linux-gnu
using the submitter's test case compiled with -O2.

A similar hunt on mainline identified the merge of the 3.4 improvements
branch in December; very odd.  Even more odd is that I get different
results with recent mainline compilers depending on whether I use gcc or
cc1 directly.  Sounds like something is uninitialized.


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug optimization/12419] [3.3/3.4 Regression] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (3 preceding siblings ...)
  2003-09-29 23:07 ` janis187 at us dot ibm dot com
@ 2003-09-29 23:15 ` pinskia at gcc dot gnu dot org
  2003-09-30 19:39 ` aph at gcc dot gnu dot org
                   ` (19 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2003-09-29 23:15 UTC (permalink / raw)
  To: gcc-bugs

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419



------- Additional Comments From pinskia at gcc dot gnu dot org  2003-09-29 22:51 -------
The reason why you get different results between using gcc and cc1 now is because the way the 
default target (i686 vs. i386) is handled now.


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug optimization/12419] [3.3/3.4 Regression] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (4 preceding siblings ...)
  2003-09-29 23:15 ` pinskia at gcc dot gnu dot org
@ 2003-09-30 19:39 ` aph at gcc dot gnu dot org
  2003-10-06  8:01 ` bonzini at gnu dot org
                   ` (18 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: aph at gcc dot gnu dot org @ 2003-09-30 19:39 UTC (permalink / raw)
  To: gcc-bugs

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419



------- Additional Comments From aph at gcc dot gnu dot org  2003-09-30 18:23 -------
Thanks for the analysis.  Yes, this makes sense.  But it is a nasty
pessimization, and we need to get it fixed somehow.  I'm interested because it
hits method dispatch badly.


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug optimization/12419] [3.3/3.4 Regression] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (5 preceding siblings ...)
  2003-09-30 19:39 ` aph at gcc dot gnu dot org
@ 2003-10-06  8:01 ` bonzini at gnu dot org
  2003-12-18 17:39 ` steven at gcc dot gnu dot org
                   ` (17 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: bonzini at gnu dot org @ 2003-10-06  8:01 UTC (permalink / raw)
  To: gcc-bugs

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419



------- Additional Comments From bonzini at gnu dot org  2003-10-06 08:01 -------
This patch

http://gcc.gnu.org/ml/gcc-patches/2003-02/msg01655.html

was reviewed by rth who suggested an alternative approach:

http://gcc.gnu.org/ml/gcc-patches/2003-04/msg00482.html

> As for Zdenek's proposed prepass patch... I think it would be
> better to not iterate over the entire instruction stream twice.
> We could, for instance, change the return value of purge_addressof_1
> to be three-state, with the new return location indicating that
> we should re-process this insn at the end.


Paolo


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug optimization/12419] [3.3/3.4 Regression] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (6 preceding siblings ...)
  2003-10-06  8:01 ` bonzini at gnu dot org
@ 2003-12-18 17:39 ` steven at gcc dot gnu dot org
  2004-01-04  9:11 ` pinskia at gcc dot gnu dot org
                   ` (16 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: steven at gcc dot gnu dot org @ 2003-12-18 17:39 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From steven at gcc dot gnu dot org  2003-12-18 17:29 -------
The bug is still present on mainline... 
(cc1 -O2 -fomit-frame-pointer-march=i686 -mtune=i686 ): 
 
foo: 
        pushl   %ebx 
        subl    $8, %esp 
        movl    a, %ebx 
        call    f 
        movl    a, %eax 
        addl    $8, %esp 
        addl    %eax, %ebx 
        movl    %ebx, %eax 
        popl    %ebx 
        ret 
 
 
Just for fun, here's what tree-ssa makes of it 
 
foo: 
        pushl   %ebx 
        subl    $8, %esp 
        movl    a, %ebx 
        call    f 
        addl    $8, %esp 
        leal    (%ebx,%ebx), %eax 
        popl    %ebx 
        ret 
 

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2003-09-27 06:36:21         |2003-12-18 17:29:55
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug optimization/12419] [3.3/3.4 Regression] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (7 preceding siblings ...)
  2003-12-18 17:39 ` steven at gcc dot gnu dot org
@ 2004-01-04  9:11 ` pinskia at gcc dot gnu dot org
  2004-01-04  9:17 ` pinskia at gcc dot gnu dot org
                   ` (15 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-01-04  9:11 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From pinskia at gcc dot gnu dot org  2004-01-04 09:11 -------
pessimizes-code is not a blocker for branching so reducing severity and also it looks like 
it is also fixed on the tree-ssa.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug optimization/12419] [3.3/3.4 Regression] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (8 preceding siblings ...)
  2004-01-04  9:11 ` pinskia at gcc dot gnu dot org
@ 2004-01-04  9:17 ` pinskia at gcc dot gnu dot org
  2004-01-12 15:09 ` giovannibajo at libero dot it
                   ` (14 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-01-04  9:17 UTC (permalink / raw)
  To: gcc-bugs



-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|critical                    |normal


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug optimization/12419] [3.3/3.4 Regression] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (9 preceding siblings ...)
  2004-01-04  9:17 ` pinskia at gcc dot gnu dot org
@ 2004-01-12 15:09 ` giovannibajo at libero dot it
  2004-01-13 11:46 ` ebotcazou at gcc dot gnu dot org
                   ` (13 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: giovannibajo at libero dot it @ 2004-01-12 15:09 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From giovannibajo at libero dot it  2004-01-12 15:09 -------
pessimizes-code is *very* important especially when it's a regression. Our 
releases are not supposed to generate slower code. Bumping priority up again.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |critical


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug optimization/12419] [3.3/3.4 Regression] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (10 preceding siblings ...)
  2004-01-12 15:09 ` giovannibajo at libero dot it
@ 2004-01-13 11:46 ` ebotcazou at gcc dot gnu dot org
  2004-01-16 17:33 ` aph at gcc dot gnu dot org
                   ` (12 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: ebotcazou at gcc dot gnu dot org @ 2004-01-13 11:46 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From ebotcazou at gcc dot gnu dot org  2004-01-13 11:46 -------
Related to PR opt/13424.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug optimization/12419] [3.3/3.4 Regression] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (11 preceding siblings ...)
  2004-01-13 11:46 ` ebotcazou at gcc dot gnu dot org
@ 2004-01-16 17:33 ` aph at gcc dot gnu dot org
  2004-01-17  8:51 ` [Bug optimization/12419] [3.3/3.4/3.5 " ebotcazou at gcc dot gnu dot org
                   ` (11 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: aph at gcc dot gnu dot org @ 2004-01-16 17:33 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From aph at gcc dot gnu dot org  2004-01-16 17:33 -------
Eric, why do you say this is related to opt/13424?

AFAICS the patch there relates only to constructors.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug optimization/12419] [3.3/3.4/3.5 Regression] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (12 preceding siblings ...)
  2004-01-16 17:33 ` aph at gcc dot gnu dot org
@ 2004-01-17  8:51 ` ebotcazou at gcc dot gnu dot org
  2004-03-02  2:22 ` pinskia at gcc dot gnu dot org
                   ` (10 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: ebotcazou at gcc dot gnu dot org @ 2004-01-17  8:51 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From ebotcazou at gcc dot gnu dot org  2004-01-17 08:51 -------
Because PR opt/13424 also relates to RTX_UNCHANGING_P and (fake) double writes.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug optimization/12419] [3.3/3.4/3.5 Regression] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (13 preceding siblings ...)
  2004-01-17  8:51 ` [Bug optimization/12419] [3.3/3.4/3.5 " ebotcazou at gcc dot gnu dot org
@ 2004-03-02  2:22 ` pinskia at gcc dot gnu dot org
  2004-03-02 10:03 ` aph at gcc dot gnu dot org
                   ` (9 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-03-02  2:22 UTC (permalink / raw)
  To: gcc-bugs



-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|critical                    |normal
      Known to fail|                            |3.4.0 3.3.1
      Known to work|3.2 tree-ssa                |3.2 tree-ssa 3.2.3
   Last reconfirmed|2004-01-13 13:18:28         |2004-03-02 02:22:53
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug optimization/12419] [3.3/3.4/3.5 Regression] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (14 preceding siblings ...)
  2004-03-02  2:22 ` pinskia at gcc dot gnu dot org
@ 2004-03-02 10:03 ` aph at gcc dot gnu dot org
  2004-03-02 12:16 ` giovannibajo at libero dot it
                   ` (8 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: aph at gcc dot gnu dot org @ 2004-03-02 10:03 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From aph at gcc dot gnu dot org  2004-03-02 10:03 -------
The severity has been set, increased, and then decreased again.  Is
this just a matter of different people's opinions, or is there some
better reason?



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug optimization/12419] [3.3/3.4/3.5 Regression] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (15 preceding siblings ...)
  2004-03-02 10:03 ` aph at gcc dot gnu dot org
@ 2004-03-02 12:16 ` giovannibajo at libero dot it
  2004-04-01 17:02 ` jakub at gcc dot gnu dot org
                   ` (7 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: giovannibajo at libero dot it @ 2004-03-02 12:16 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From giovannibajo at libero dot it  2004-03-02 12:16 -------
I think it's just a mistake on Andrew's side, since we already discussed that 
this bug is very important. Bumped priority again.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |critical


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug optimization/12419] [3.3/3.4/3.5 Regression] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (16 preceding siblings ...)
  2004-03-02 12:16 ` giovannibajo at libero dot it
@ 2004-04-01 17:02 ` jakub at gcc dot gnu dot org
  2004-04-05 15:36 ` jakub at gcc dot gnu dot org
                   ` (6 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: jakub at gcc dot gnu dot org @ 2004-04-01 17:02 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From jakub at gcc dot gnu dot org  2004-04-01 17:02 -------
Patch in http://gcc.gnu.org/ml/gcc-patches/2004-03/msg02251.html, waiting
until PR optimization/13424 is resolved.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |jakub at gcc dot gnu dot org
                   |dot org                     |
             Status|NEW                         |ASSIGNED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug optimization/12419] [3.3/3.4/3.5 Regression] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (17 preceding siblings ...)
  2004-04-01 17:02 ` jakub at gcc dot gnu dot org
@ 2004-04-05 15:36 ` jakub at gcc dot gnu dot org
  2004-06-11 22:21 ` [Bug rtl-optimization/12419] [3.3 " pinskia at gcc dot gnu dot org
                   ` (5 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: jakub at gcc dot gnu dot org @ 2004-04-05 15:36 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From jakub at gcc dot gnu dot org  2004-04-05 15:35 -------
Should be fixed on gcc-3_4-branch.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|3.4.0 3.3.1                 |3.3.1
   Target Milestone|3.4.0                       |3.3.4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug rtl-optimization/12419] [3.3 Regression] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (18 preceding siblings ...)
  2004-04-05 15:36 ` jakub at gcc dot gnu dot org
@ 2004-06-11 22:21 ` pinskia at gcc dot gnu dot org
  2004-09-06 14:16 ` aph at gcc dot gnu dot org
                   ` (4 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-06-11 22:21 UTC (permalink / raw)
  To: gcc-bugs



-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|3.3.4                       |3.3.5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug rtl-optimization/12419] [3.3 Regression] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (19 preceding siblings ...)
  2004-06-11 22:21 ` [Bug rtl-optimization/12419] [3.3 " pinskia at gcc dot gnu dot org
@ 2004-09-06 14:16 ` aph at gcc dot gnu dot org
  2004-09-28 13:23 ` gdr at gcc dot gnu dot org
                   ` (3 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: aph at gcc dot gnu dot org @ 2004-09-06 14:16 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From aph at gcc dot gnu dot org  2004-09-06 14:16 -------
Hi, Jakub.  What's your state on this?

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug rtl-optimization/12419] [3.3 Regression] Performace regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (20 preceding siblings ...)
  2004-09-06 14:16 ` aph at gcc dot gnu dot org
@ 2004-09-28 13:23 ` gdr at gcc dot gnu dot org
  2004-09-28 13:36 ` [Bug rtl-optimization/12419] [3.3 Regression] Performance " jakub at gcc dot gnu dot org
                   ` (2 subsequent siblings)
  24 siblings, 0 replies; 26+ messages in thread
From: gdr at gcc dot gnu dot org @ 2004-09-28 13:23 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From gdr at gcc dot gnu dot org  2004-09-28 13:23 -------
(In reply to comment #16)
> Should be fixed on gcc-3_4-branch.

(In reply to comment #16)
> Should be fixed on gcc-3_4-branch.

Jakub --
  Do you plan to do anything for this on gcc-3_3-branch?

-- Gaby


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|3.2 tree-ssa 3.2.3 3.4.0 4.0|3.2 tree-ssa 3.2.3 3.4.0
                   |                            |4.0.0
   Target Milestone|3.3.5                       |3.3.6


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug rtl-optimization/12419] [3.3 Regression] Performance regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (21 preceding siblings ...)
  2004-09-28 13:23 ` gdr at gcc dot gnu dot org
@ 2004-09-28 13:36 ` jakub at gcc dot gnu dot org
  2004-09-28 13:56 ` gdr at cs dot tamu dot edu
  2004-09-28 13:57 ` gdr at gcc dot gnu dot org
  24 siblings, 0 replies; 26+ messages in thread
From: jakub at gcc dot gnu dot org @ 2004-09-28 13:36 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From jakub at gcc dot gnu dot org  2004-09-28 13:31 -------
I think 3.3 should probably stay as is.
RTX_UNCHANGING_P turned out to be a can of bugs, there were many changes in that
area in GCC 3.4 (and gcc-3_3-rhl-branch that has basically same code as 3.4 for
that) and there is no single safe patch that can be applied to 3.3.
Either we backport all RTX_UNCHANGING_P changes in 3.4 and exchange one set of
bugs with another one, or keep 3.3 as is.
HEAD got rid of RTX_UNCHANGING_P altogether, so there these kinds of bugs aren't
lurking anymore.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug rtl-optimization/12419] [3.3 Regression] Performance regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (22 preceding siblings ...)
  2004-09-28 13:36 ` [Bug rtl-optimization/12419] [3.3 Regression] Performance " jakub at gcc dot gnu dot org
@ 2004-09-28 13:56 ` gdr at cs dot tamu dot edu
  2004-09-28 13:57 ` gdr at gcc dot gnu dot org
  24 siblings, 0 replies; 26+ messages in thread
From: gdr at cs dot tamu dot edu @ 2004-09-28 13:56 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From gdr at cs dot tamu dot edu  2004-09-28 13:56 -------
Subject: Re:  [3.3 Regression] Performance regression: poor optimization of const memory

"jakub at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> writes:

| I think 3.3 should probably stay as is.

Good!  Let's close this bug.

-- gaby


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [Bug rtl-optimization/12419] [3.3 Regression] Performance regression: poor optimization of const memory
  2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
                   ` (23 preceding siblings ...)
  2004-09-28 13:56 ` gdr at cs dot tamu dot edu
@ 2004-09-28 13:57 ` gdr at gcc dot gnu dot org
  24 siblings, 0 replies; 26+ messages in thread
From: gdr at gcc dot gnu dot org @ 2004-09-28 13:57 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From gdr at gcc dot gnu dot org  2004-09-28 13:55 -------
Won't fix in 3.3.x

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|3.3.6                       |3.4.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419


^ permalink raw reply	[flat|nested] 26+ messages in thread
end of thread, other threads:[~2004-09-28 13:56 UTC | newest]

Thread overview: 26+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2003-09-26 14:55 [Bug optimization/12419] New: Performace regression: poor optimization of const memory aph at gcc dot gnu dot org
2003-09-26 14:56 ` [Bug optimization/12419] " aph at gcc dot gnu dot org
2003-09-26 18:35 ` bangerth at dealii dot org
2003-09-27  8:12 ` [Bug optimization/12419] [3.3/3.4 Regression] " pinskia at gcc dot gnu dot org
2003-09-29 23:07 ` janis187 at us dot ibm dot com
2003-09-29 23:15 ` pinskia at gcc dot gnu dot org
2003-09-30 19:39 ` aph at gcc dot gnu dot org
2003-10-06  8:01 ` bonzini at gnu dot org
2003-12-18 17:39 ` steven at gcc dot gnu dot org
2004-01-04  9:11 ` pinskia at gcc dot gnu dot org
2004-01-04  9:17 ` pinskia at gcc dot gnu dot org
2004-01-12 15:09 ` giovannibajo at libero dot it
2004-01-13 11:46 ` ebotcazou at gcc dot gnu dot org
2004-01-16 17:33 ` aph at gcc dot gnu dot org
2004-01-17  8:51 ` [Bug optimization/12419] [3.3/3.4/3.5 " ebotcazou at gcc dot gnu dot org
2004-03-02  2:22 ` pinskia at gcc dot gnu dot org
2004-03-02 10:03 ` aph at gcc dot gnu dot org
2004-03-02 12:16 ` giovannibajo at libero dot it
2004-04-01 17:02 ` jakub at gcc dot gnu dot org
2004-04-05 15:36 ` jakub at gcc dot gnu dot org
2004-06-11 22:21 ` [Bug rtl-optimization/12419] [3.3 " pinskia at gcc dot gnu dot org
2004-09-06 14:16 ` aph at gcc dot gnu dot org
2004-09-28 13:23 ` gdr at gcc dot gnu dot org
2004-09-28 13:36 ` [Bug rtl-optimization/12419] [3.3 Regression] Performance " jakub at gcc dot gnu dot org
2004-09-28 13:56 ` gdr at cs dot tamu dot edu
2004-09-28 13:57 ` gdr at gcc dot gnu dot org

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).