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* [Bug c++/23372] [4.0/4.1 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
@ 2005-10-16 22:20 ` pinskia at gcc dot gnu dot org
2005-10-31 5:00 ` mmitchel at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2005-10-16 22:20 UTC (permalink / raw)
To: gcc-bugs
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pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |pinskia at gcc dot gnu dot
| |org
Severity|normal |minor
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23372
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* [Bug c++/23372] [4.0/4.1 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
2005-10-16 22:20 ` [Bug c++/23372] [4.0/4.1 Regression] Temporary aggregate copy not elided when passing parameters by value pinskia at gcc dot gnu dot org
@ 2005-10-31 5:00 ` mmitchel at gcc dot gnu dot org
2006-01-14 12:40 ` [Bug c++/23372] [4.0/4.1/4.2 " rguenth at gcc dot gnu dot org
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From: mmitchel at gcc dot gnu dot org @ 2005-10-31 5:00 UTC (permalink / raw)
To: gcc-bugs
------- Comment #14 from mmitchel at gcc dot gnu dot org 2005-10-31 05:00 -------
Leaving as P2.
--
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* [Bug c++/23372] [4.0/4.1/4.2 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
2005-10-16 22:20 ` [Bug c++/23372] [4.0/4.1 Regression] Temporary aggregate copy not elided when passing parameters by value pinskia at gcc dot gnu dot org
2005-10-31 5:00 ` mmitchel at gcc dot gnu dot org
@ 2006-01-14 12:40 ` rguenth at gcc dot gnu dot org
2006-01-14 17:12 ` rguenth at gcc dot gnu dot org
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From: rguenth at gcc dot gnu dot org @ 2006-01-14 12:40 UTC (permalink / raw)
To: gcc-bugs
------- Comment #15 from rguenth at gcc dot gnu dot org 2006-01-14 12:40 -------
I decided to give this another look. My hack is surely a progression on this
issue and maybe even appropriate for the branches. Now trying to figure out
what goes wrong with it.
--
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* [Bug c++/23372] [4.0/4.1/4.2 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
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2006-01-14 12:40 ` [Bug c++/23372] [4.0/4.1/4.2 " rguenth at gcc dot gnu dot org
@ 2006-01-14 17:12 ` rguenth at gcc dot gnu dot org
2006-01-30 13:46 ` rguenth at gcc dot gnu dot org
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From: rguenth at gcc dot gnu dot org @ 2006-01-14 17:12 UTC (permalink / raw)
To: gcc-bugs
------- Comment #16 from rguenth at gcc dot gnu dot org 2006-01-14 17:12 -------
I have a fix which improves the situation by modifying the gimplifier.
--
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* [Bug c++/23372] [4.0/4.1/4.2 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
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2006-01-14 17:12 ` rguenth at gcc dot gnu dot org
@ 2006-01-30 13:46 ` rguenth at gcc dot gnu dot org
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From: rguenth at gcc dot gnu dot org @ 2006-01-30 13:46 UTC (permalink / raw)
To: gcc-bugs
------- Comment #17 from rguenth at gcc dot gnu dot org 2006-01-30 13:46 -------
Subject: Bug 23372
Author: rguenth
Date: Mon Jan 30 13:46:30 2006
New Revision: 110396
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=110396
Log:
2006-01-30 Richard Guenther <rguenther@suse.de>
PR c++/23372
* gimplify.c (gimplify_target_expr): Handle easy cases
without creating a temporary.
* gcc.dg/pr23372-1.C: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/pr23372-1.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/gimplify.c
trunk/gcc/testsuite/ChangeLog
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23372
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* [Bug c++/23372] [4.0/4.1/4.2 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (4 preceding siblings ...)
2006-01-30 13:46 ` rguenth at gcc dot gnu dot org
@ 2006-01-30 13:48 ` rguenth at gcc dot gnu dot org
2006-01-31 15:24 ` [Bug c++/23372] [4.0/4.1 " pinskia at gcc dot gnu dot org
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From: rguenth at gcc dot gnu dot org @ 2006-01-30 13:48 UTC (permalink / raw)
To: gcc-bugs
------- Comment #18 from rguenth at gcc dot gnu dot org 2006-01-30 13:48 -------
The original testcase is now fixed on the mainline.
--
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* [Bug c++/23372] [4.0/4.1 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (5 preceding siblings ...)
2006-01-30 13:48 ` rguenth at gcc dot gnu dot org
@ 2006-01-31 15:24 ` pinskia at gcc dot gnu dot org
2006-01-31 16:03 ` rguenth at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2006-01-31 15:24 UTC (permalink / raw)
To: gcc-bugs
------- Comment #19 from pinskia at gcc dot gnu dot org 2006-01-31 15:24 -------
The test for this PR (gcc.dg/pr23372-1.c) fails on powerpc-darwin because there
is no memcpy outputted in the asm.
There is a loop:
L2:
lbzx r0,r9,r2
stbx r0,r11,r2
addi r2,r2,1
L3:
bdnz L2
But no memcpy.
--
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* [Bug c++/23372] [4.0/4.1 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (6 preceding siblings ...)
2006-01-31 15:24 ` [Bug c++/23372] [4.0/4.1 " pinskia at gcc dot gnu dot org
@ 2006-01-31 16:03 ` rguenth at gcc dot gnu dot org
2006-01-31 16:05 ` pinskia at gcc dot gnu dot org
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From: rguenth at gcc dot gnu dot org @ 2006-01-31 16:03 UTC (permalink / raw)
To: gcc-bugs
------- Comment #20 from rguenth at gcc dot gnu dot org 2006-01-31 16:03 -------
So, { xfail powerpc*-darwin* } the test?
--
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* [Bug c++/23372] [4.0/4.1 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
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2006-01-31 16:03 ` rguenth at gcc dot gnu dot org
@ 2006-01-31 16:05 ` pinskia at gcc dot gnu dot org
2006-01-31 16:05 ` pinskia at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2006-01-31 16:05 UTC (permalink / raw)
To: gcc-bugs
------- Comment #21 from pinskia at gcc dot gnu dot org 2006-01-31 16:05 -------
(In reply to comment #20)
> So, { xfail powerpc*-darwin* } the test?
More like
{ xfail powerpc*-*-darwin* powerpc*-*-aix* rs6000-*-* powerpc64-*-linux* &&
lp64 }
--
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* [Bug c++/23372] [4.0/4.1 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (8 preceding siblings ...)
2006-01-31 16:05 ` pinskia at gcc dot gnu dot org
@ 2006-01-31 16:05 ` pinskia at gcc dot gnu dot org
2006-02-02 9:16 ` rguenth at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2006-01-31 16:05 UTC (permalink / raw)
To: gcc-bugs
------- Comment #22 from pinskia at gcc dot gnu dot org 2006-01-31 16:05 -------
(In reply to comment #21)
> (In reply to comment #20)
> > So, { xfail powerpc*-darwin* } the test?
>
> More like
> { xfail powerpc*-*-darwin* powerpc*-*-aix* rs6000-*-* powerpc64-*-linux* &&
> lp64 }
Or even better just don't run the test there as it is passing just not the way
you are expecting.
--
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* [Bug c++/23372] [4.0/4.1 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (9 preceding siblings ...)
2006-01-31 16:05 ` pinskia at gcc dot gnu dot org
@ 2006-02-02 9:16 ` rguenth at gcc dot gnu dot org
2006-02-02 17:16 ` sje at cup dot hp dot com
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From: rguenth at gcc dot gnu dot org @ 2006-02-02 9:16 UTC (permalink / raw)
To: gcc-bugs
------- Comment #23 from rguenth at gcc dot gnu dot org 2006-02-02 09:16 -------
I cannot get a target selector work that would exclude the patterns you
mention. This seems to work though:
/* { dg-do compile { xfail { powerpc*-*-darwin* powerpc*-*-aix* rs6000-*-* } ||
{ powerpc64-*-linux* && lp64 } } } */
--
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* [Bug c++/23372] [4.0/4.1 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (10 preceding siblings ...)
2006-02-02 9:16 ` rguenth at gcc dot gnu dot org
@ 2006-02-02 17:16 ` sje at cup dot hp dot com
2006-02-03 1:49 ` hp at gcc dot gnu dot org
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From: sje at cup dot hp dot com @ 2006-02-02 17:16 UTC (permalink / raw)
To: gcc-bugs
------- Comment #24 from sje at cup dot hp dot com 2006-02-02 17:16 -------
This test is also failing on hppa*-*-hpux* and ia64-*-hpux*.
--
sje at cup dot hp dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |sje at cup dot hp dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23372
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* [Bug c++/23372] [4.0/4.1 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (11 preceding siblings ...)
2006-02-02 17:16 ` sje at cup dot hp dot com
@ 2006-02-03 1:49 ` hp at gcc dot gnu dot org
2006-02-03 9:16 ` rguenth at gcc dot gnu dot org
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From: hp at gcc dot gnu dot org @ 2006-02-03 1:49 UTC (permalink / raw)
To: gcc-bugs
------- Comment #25 from hp at gcc dot gnu dot org 2006-02-03 01:49 -------
Also fails for mmix-knuth-mmixware. This is an ABI thing; callee copies if
it needs to modify (for MMIX, it's f() that does the memcpy).
Add testsuite framework or run only on specific targets, please.
--
hp at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hp at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23372
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* [Bug c++/23372] [4.0/4.1 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (12 preceding siblings ...)
2006-02-03 1:49 ` hp at gcc dot gnu dot org
@ 2006-02-03 9:16 ` rguenth at gcc dot gnu dot org
2006-02-07 15:36 ` rguenth at gcc dot gnu dot org
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From: rguenth at gcc dot gnu dot org @ 2006-02-03 9:16 UTC (permalink / raw)
To: gcc-bugs
------- Comment #26 from rguenth at gcc dot gnu dot org 2006-02-03 09:16 -------
Ok, I'll skim through the posted testresults and will restrict the test to
working targets.
--
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* [Bug c++/23372] [4.0/4.1 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (13 preceding siblings ...)
2006-02-03 9:16 ` rguenth at gcc dot gnu dot org
@ 2006-02-07 15:36 ` rguenth at gcc dot gnu dot org
2006-02-07 15:39 ` [Bug c++/23372] [4.0/4.1/4.2 " rguenth at gcc dot gnu dot org
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From: rguenth at gcc dot gnu dot org @ 2006-02-07 15:36 UTC (permalink / raw)
To: gcc-bugs
------- Comment #27 from rguenth at gcc dot gnu dot org 2006-02-07 15:36 -------
Subject: Bug 23372
Author: rguenth
Date: Tue Feb 7 15:36:44 2006
New Revision: 110699
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=110699
Log:
2006-02-07 Richard Guenther <rguenther@suse.de>
PR c++/26140
Revert
2006-01-30 Richard Guenther <rguenther@suse.de>
PR c++/23372
* gimplify.c (gimplify_target_expr): Handle easy cases
without creating a temporary.
Revert
2006-01-30 Richard Guenther <rguenther@suse.de>
PR c++/23372
* gcc.dg/pr23372-1.C: New testcase.
* g++.dg/tree-ssa/pr26140.C: New testcase.
Added:
trunk/gcc/testsuite/g++.dg/tree-ssa/pr26140.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/gimplify.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/pr23372-1.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23372
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* [Bug c++/23372] [4.0/4.1/4.2 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (14 preceding siblings ...)
2006-02-07 15:36 ` rguenth at gcc dot gnu dot org
@ 2006-02-07 15:39 ` rguenth at gcc dot gnu dot org
2006-02-08 15:11 ` rguenth at gcc dot gnu dot org
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From: rguenth at gcc dot gnu dot org @ 2006-02-07 15:39 UTC (permalink / raw)
To: gcc-bugs
------- Comment #28 from rguenth at gcc dot gnu dot org 2006-02-07 15:39 -------
So we regress for 4.2 again as the patch caused problems.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to fail|4.0.0 4.1.0 |4.0.0 4.1.0 4.2.0
Known to work|3.4.0 3.3.3 3.2.3 3.0.4 |3.4.0 3.3.3 3.2.3 3.0.4
|2.95.3 4.2.0 |2.95.3
Summary|[4.0/4.1 Regression] |[4.0/4.1/4.2 Regression]
|Temporary aggregate copy not|Temporary aggregate copy not
|elided when passing |elided when passing
|parameters by value |parameters by value
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23372
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* [Bug c++/23372] [4.0/4.1/4.2 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (15 preceding siblings ...)
2006-02-07 15:39 ` [Bug c++/23372] [4.0/4.1/4.2 " rguenth at gcc dot gnu dot org
@ 2006-02-08 15:11 ` rguenth at gcc dot gnu dot org
2006-02-08 15:16 ` pinskia at gcc dot gnu dot org
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From: rguenth at gcc dot gnu dot org @ 2006-02-08 15:11 UTC (permalink / raw)
To: gcc-bugs
------- Comment #29 from rguenth at gcc dot gnu dot org 2006-02-08 15:11 -------
Created an attachment (id=10802)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=10802&action=view)
patch for aggregate copyprop
This patch (on top of infrastructure provided by the general copyprop
improvements) modifies forwprop to do copy propagation of aggregates. Untested
apart from the fact it fixes all the testcases here.
--
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
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23372
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* [Bug c++/23372] [4.0/4.1/4.2 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (17 preceding siblings ...)
2006-02-08 15:16 ` pinskia at gcc dot gnu dot org
@ 2006-02-08 15:16 ` rguenth at gcc dot gnu dot org
2006-02-08 15:18 ` rguenth at gcc dot gnu dot org
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From: rguenth at gcc dot gnu dot org @ 2006-02-08 15:16 UTC (permalink / raw)
To: gcc-bugs
------- Comment #31 from rguenth at gcc dot gnu dot org 2006-02-08 15:16 -------
For reference, I talk about
http://gcc.gnu.org/ml/gcc-patches/2006-02/msg00669.html
excluding the tree-ssa-copy.c parts.
--
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* [Bug c++/23372] [4.0/4.1/4.2 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (16 preceding siblings ...)
2006-02-08 15:11 ` rguenth at gcc dot gnu dot org
@ 2006-02-08 15:16 ` pinskia at gcc dot gnu dot org
2006-02-08 15:16 ` rguenth at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2006-02-08 15:16 UTC (permalink / raw)
To: gcc-bugs
------- Comment #30 from pinskia at gcc dot gnu dot org 2006-02-08 15:16 -------
(In reply to comment #29)
> This patch (on top of infrastructure provided by the general copyprop
> improvements) modifies forwprop to do copy propagation of aggregates. Untested
> apart from the fact it fixes all the testcases here.
Forward prop is really a semi hack waiting for a true combiner. And this seems
like the wrong spot anyways as forward prop is only really for scalars really.
--
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* [Bug c++/23372] [4.0/4.1/4.2 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (18 preceding siblings ...)
2006-02-08 15:16 ` rguenth at gcc dot gnu dot org
@ 2006-02-08 15:18 ` rguenth at gcc dot gnu dot org
2006-02-14 15:41 ` rguenth at gcc dot gnu dot org
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From: rguenth at gcc dot gnu dot org @ 2006-02-08 15:18 UTC (permalink / raw)
To: gcc-bugs
------- Comment #32 from rguenth at gcc dot gnu dot org 2006-02-08 15:18 -------
Of course you are right. But backporting this to 4.1 may be the only chance to
get the stackspace / extra temporaries regressions solved there, as using
forwprop for this hack is the most easiest (and frankly forwprop has become a
place exactly for such hacks already ;)).
--
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* [Bug c++/23372] [4.0/4.1/4.2 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (19 preceding siblings ...)
2006-02-08 15:18 ` rguenth at gcc dot gnu dot org
@ 2006-02-14 15:41 ` rguenth at gcc dot gnu dot org
2006-02-14 15:41 ` rguenth at gcc dot gnu dot org
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From: rguenth at gcc dot gnu dot org @ 2006-02-14 15:41 UTC (permalink / raw)
To: gcc-bugs
------- Comment #34 from rguenth at gcc dot gnu dot org 2006-02-14 15:41 -------
We're not depending on struct copyprop here.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
BugsThisDependsOn|14295 |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23372
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* [Bug c++/23372] [4.0/4.1/4.2 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (20 preceding siblings ...)
2006-02-14 15:41 ` rguenth at gcc dot gnu dot org
@ 2006-02-14 15:41 ` rguenth at gcc dot gnu dot org
2006-02-24 0:30 ` mmitchel at gcc dot gnu dot org
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From: rguenth at gcc dot gnu dot org @ 2006-02-14 15:41 UTC (permalink / raw)
To: gcc-bugs
------- Comment #33 from rguenth at gcc dot gnu dot org 2006-02-14 15:40 -------
The attached patch is bogus, and a correct one doesn't fix the first testcase
(as the attached one didn't, too). As analyzed previously, expand does not
deal with
void g(A*) (a)
{
struct A D.2007;
<bb 2>:
D.2007 = *a_1;
f (D.2007) [tail call];
return;
}
and TER doesn't produce (non-gimple) f (*a). Still TER looks like the only
place where we could get this fixed, because we still have dataflow
information left. Also a real struct copyprop pass will not help here.
As TER / outof-ssa is not something I want to look into, unassigning this.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|rguenth at gcc dot gnu dot |unassigned at gcc dot gnu
|org |dot org
Status|ASSIGNED |NEW
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23372
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* [Bug c++/23372] [4.0/4.1/4.2 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (21 preceding siblings ...)
2006-02-14 15:41 ` rguenth at gcc dot gnu dot org
@ 2006-02-24 0:30 ` mmitchel at gcc dot gnu dot org
2006-04-06 10:59 ` guillaume dot melquiond at ens-lyon dot fr
` (8 subsequent siblings)
31 siblings, 0 replies; 32+ messages in thread
From: mmitchel at gcc dot gnu dot org @ 2006-02-24 0:30 UTC (permalink / raw)
To: gcc-bugs
------- Comment #35 from mmitchel at gcc dot gnu dot org 2006-02-24 00:26 -------
This issue will not be resolved in GCC 4.1.0; retargeted at GCC 4.1.1.
--
mmitchel at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.0.3 |4.1.1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23372
^ permalink raw reply [flat|nested] 32+ messages in thread
* [Bug c++/23372] [4.0/4.1/4.2 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (22 preceding siblings ...)
2006-02-24 0:30 ` mmitchel at gcc dot gnu dot org
@ 2006-04-06 10:59 ` guillaume dot melquiond at ens-lyon dot fr
2006-05-25 2:34 ` mmitchel at gcc dot gnu dot org
` (7 subsequent siblings)
31 siblings, 0 replies; 32+ messages in thread
From: guillaume dot melquiond at ens-lyon dot fr @ 2006-04-06 10:59 UTC (permalink / raw)
To: gcc-bugs
------- Comment #36 from guillaume dot melquiond at ens-lyon dot fr 2006-04-06 10:59 -------
The generated code is getting both better and worse. I just tested with GCC
4.1, and there is now a byte-by-byte (!) copy instead of memcpy. So not only
does GCC use superfluous copies, but it generates code such that these copies
are the slowest possible. On the other hand, there is only one copy left. So
this is better than GCC 4.0, but still worse than GCC 3.4.
pushl %ebp
movl %esp, %ebp
pushl %ebx
subl $8004, %esp
leal -4004(%ebp), %ebx
movl %ebx, (%esp)
call f
xorl %edx, %edx
subl $4, %esp
.L3:
cmpl $4000, %edx
jb .L2
call g
movl -4(%ebp), %ebx
leave
ret
.p2align 4,,7
.L2:
movzbl (%ebx,%edx), %eax
movb %al, (%esp,%edx)
incl %edx
jmp .L3
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23372
^ permalink raw reply [flat|nested] 32+ messages in thread
* [Bug c++/23372] [4.0/4.1/4.2 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (23 preceding siblings ...)
2006-04-06 10:59 ` guillaume dot melquiond at ens-lyon dot fr
@ 2006-05-25 2:34 ` mmitchel at gcc dot gnu dot org
2006-08-22 21:09 ` jason at gcc dot gnu dot org
` (6 subsequent siblings)
31 siblings, 0 replies; 32+ messages in thread
From: mmitchel at gcc dot gnu dot org @ 2006-05-25 2:34 UTC (permalink / raw)
To: gcc-bugs
------- Comment #37 from mmitchel at gcc dot gnu dot org 2006-05-25 02:33 -------
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=23372
^ permalink raw reply [flat|nested] 32+ messages in thread
* [Bug c++/23372] [4.0/4.1/4.2 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (24 preceding siblings ...)
2006-05-25 2:34 ` mmitchel at gcc dot gnu dot org
@ 2006-08-22 21:09 ` jason at gcc dot gnu dot org
2006-08-23 4:28 ` jason at gcc dot gnu dot org
` (5 subsequent siblings)
31 siblings, 0 replies; 32+ messages in thread
From: jason at gcc dot gnu dot org @ 2006-08-22 21:09 UTC (permalink / raw)
To: gcc-bugs
--
jason at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |jason at gcc dot gnu dot org
|dot org |
Status|NEW |ASSIGNED
Last reconfirmed|2006-07-05 09:38:34 |2006-08-22 21:08:50
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23372
^ permalink raw reply [flat|nested] 32+ messages in thread
* [Bug c++/23372] [4.0/4.1/4.2 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (25 preceding siblings ...)
2006-08-22 21:09 ` jason at gcc dot gnu dot org
@ 2006-08-23 4:28 ` jason at gcc dot gnu dot org
2006-08-23 14:23 ` [Bug c++/23372] [4.0/4.1 " jason at gcc dot gnu dot org
` (4 subsequent siblings)
31 siblings, 0 replies; 32+ messages in thread
From: jason at gcc dot gnu dot org @ 2006-08-23 4:28 UTC (permalink / raw)
To: gcc-bugs
------- Comment #38 from jason at gcc dot gnu dot org 2006-08-23 04:27 -------
Subject: Bug 23372
Author: jason
Date: Wed Aug 23 04:27:43 2006
New Revision: 116342
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=116342
Log:
PR c++/23372
* call.c (build_over_call): Don't make a copy here if build_call
will make one too.
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/call.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23372
^ permalink raw reply [flat|nested] 32+ messages in thread
* [Bug c++/23372] [4.0/4.1 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (26 preceding siblings ...)
2006-08-23 4:28 ` jason at gcc dot gnu dot org
@ 2006-08-23 14:23 ` jason at gcc dot gnu dot org
2006-08-23 14:23 ` jason at gcc dot gnu dot org
` (3 subsequent siblings)
31 siblings, 0 replies; 32+ messages in thread
From: jason at gcc dot gnu dot org @ 2006-08-23 14:23 UTC (permalink / raw)
To: gcc-bugs
------- Comment #39 from jason at gcc dot gnu dot org 2006-08-23 14:22 -------
Subject: Bug 23372
Author: jason
Date: Wed Aug 23 14:22:41 2006
New Revision: 116351
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=116351
Log:
PR c++/23372
* call.c (build_over_call): Don't make a copy here if build_call
will make one too.
Modified:
branches/gcc-4_0-branch/gcc/cp/ChangeLog
branches/gcc-4_0-branch/gcc/cp/call.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23372
^ permalink raw reply [flat|nested] 32+ messages in thread
* [Bug c++/23372] [4.0/4.1 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (27 preceding siblings ...)
2006-08-23 14:23 ` [Bug c++/23372] [4.0/4.1 " jason at gcc dot gnu dot org
@ 2006-08-23 14:23 ` jason at gcc dot gnu dot org
2006-08-23 14:34 ` jason at gcc dot gnu dot org
` (2 subsequent siblings)
31 siblings, 0 replies; 32+ messages in thread
From: jason at gcc dot gnu dot org @ 2006-08-23 14:23 UTC (permalink / raw)
To: gcc-bugs
------- Comment #40 from jason at gcc dot gnu dot org 2006-08-23 14:22 -------
Subject: Bug 23372
Author: jason
Date: Wed Aug 23 14:22:49 2006
New Revision: 116352
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=116352
Log:
PR c++/23372
* call.c (build_over_call): Don't make a copy here if build_call
will make one too.
Modified:
branches/gcc-4_1-branch/gcc/cp/ChangeLog
branches/gcc-4_1-branch/gcc/cp/call.c
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23372
^ permalink raw reply [flat|nested] 32+ messages in thread
* [Bug c++/23372] [4.0/4.1 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (28 preceding siblings ...)
2006-08-23 14:23 ` jason at gcc dot gnu dot org
@ 2006-08-23 14:34 ` jason at gcc dot gnu dot org
2006-10-07 3:49 ` pinskia at gcc dot gnu dot org
2006-10-07 6:16 ` pinskia at gcc dot gnu dot org
31 siblings, 0 replies; 32+ messages in thread
From: jason at gcc dot gnu dot org @ 2006-08-23 14:34 UTC (permalink / raw)
To: gcc-bugs
------- Comment #41 from jason at gcc dot gnu dot org 2006-08-23 14:33 -------
fixed in 4.0 and 4.1 as well.
--
jason at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23372
^ permalink raw reply [flat|nested] 32+ messages in thread
* [Bug c++/23372] [4.0/4.1 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (29 preceding siblings ...)
2006-08-23 14:34 ` jason at gcc dot gnu dot org
@ 2006-10-07 3:49 ` pinskia at gcc dot gnu dot org
2006-10-07 6:16 ` pinskia at gcc dot gnu dot org
31 siblings, 0 replies; 32+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2006-10-07 3:49 UTC (permalink / raw)
To: gcc-bugs
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work|3.4.0 3.3.3 3.2.3 3.0.4 |3.4.0 3.3.3 3.2.3 3.0.4
|2.95.3 4.2.0 |2.95.3 4.2.0 4.0.4 4.1.2
Target Milestone|4.1.2 |4.0.4
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23372
^ permalink raw reply [flat|nested] 32+ messages in thread
* [Bug c++/23372] [4.0/4.1 Regression] Temporary aggregate copy not elided when passing parameters by value
[not found] <bug-23372-7904@http.gcc.gnu.org/bugzilla/>
` (30 preceding siblings ...)
2006-10-07 3:49 ` pinskia at gcc dot gnu dot org
@ 2006-10-07 6:16 ` pinskia at gcc dot gnu dot org
31 siblings, 0 replies; 32+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2006-10-07 6:16 UTC (permalink / raw)
To: gcc-bugs
------- Comment #42 from pinskia at gcc dot gnu dot org 2006-10-07 06:16 -------
*** Bug 29375 has been marked as a duplicate of this bug. ***
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |deb at pixar dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23372
^ permalink raw reply [flat|nested] 32+ messages in thread
end of thread, other threads:[~2006-10-07 6:16 UTC | newest]
Thread overview: 32+ messages (download: mbox.gz / follow: Atom feed)
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2005-10-16 22:20 ` [Bug c++/23372] [4.0/4.1 Regression] Temporary aggregate copy not elided when passing parameters by value pinskia at gcc dot gnu dot org
2005-10-31 5:00 ` mmitchel at gcc dot gnu dot org
2006-01-14 12:40 ` [Bug c++/23372] [4.0/4.1/4.2 " rguenth at gcc dot gnu dot org
2006-01-14 17:12 ` rguenth at gcc dot gnu dot org
2006-01-30 13:46 ` rguenth at gcc dot gnu dot org
2006-01-30 13:48 ` rguenth at gcc dot gnu dot org
2006-01-31 15:24 ` [Bug c++/23372] [4.0/4.1 " pinskia at gcc dot gnu dot org
2006-01-31 16:03 ` rguenth at gcc dot gnu dot org
2006-01-31 16:05 ` pinskia at gcc dot gnu dot org
2006-01-31 16:05 ` pinskia at gcc dot gnu dot org
2006-02-02 9:16 ` rguenth at gcc dot gnu dot org
2006-02-02 17:16 ` sje at cup dot hp dot com
2006-02-03 1:49 ` hp at gcc dot gnu dot org
2006-02-03 9:16 ` rguenth at gcc dot gnu dot org
2006-02-07 15:36 ` rguenth at gcc dot gnu dot org
2006-02-07 15:39 ` [Bug c++/23372] [4.0/4.1/4.2 " rguenth at gcc dot gnu dot org
2006-02-08 15:11 ` rguenth at gcc dot gnu dot org
2006-02-08 15:16 ` pinskia at gcc dot gnu dot org
2006-02-08 15:16 ` rguenth at gcc dot gnu dot org
2006-02-08 15:18 ` rguenth at gcc dot gnu dot org
2006-02-14 15:41 ` rguenth at gcc dot gnu dot org
2006-02-14 15:41 ` rguenth at gcc dot gnu dot org
2006-02-24 0:30 ` mmitchel at gcc dot gnu dot org
2006-04-06 10:59 ` guillaume dot melquiond at ens-lyon dot fr
2006-05-25 2:34 ` mmitchel at gcc dot gnu dot org
2006-08-22 21:09 ` jason at gcc dot gnu dot org
2006-08-23 4:28 ` jason at gcc dot gnu dot org
2006-08-23 14:23 ` [Bug c++/23372] [4.0/4.1 " jason at gcc dot gnu dot org
2006-08-23 14:23 ` jason at gcc dot gnu dot org
2006-08-23 14:34 ` jason at gcc dot gnu dot org
2006-10-07 3:49 ` pinskia at gcc dot gnu dot org
2006-10-07 6:16 ` pinskia at gcc dot gnu dot org
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