public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug fortran/40628] New: Assignment using "= trim(string)": Optimize "trim" away
@ 2009-07-03 7:16 burnus at gcc dot gnu dot org
2009-07-05 9:14 ` [Bug fortran/40628] " fxcoudert at gcc dot gnu dot org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: burnus at gcc dot gnu dot org @ 2009-07-03 7:16 UTC (permalink / raw)
To: gcc-bugs
In assignments, such as
string = trim(string)
string(n1:n2) = trim(string)
the trim has no effect and can be optimized away.
(Note: With Fortran 2003 and allocatable strings with "len=:", the first
version cannot be optimized as on length mismatch the LHS is reallocated.)
Such code can easily be present in real-world code and causes unnecessarily a
large overhead, cf. e.g. http://www.tddft.org/trac/octopus/changeset/5672
--
Summary: Assignment using "= trim(string)": Optimize "trim" away
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: burnus at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40628
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug fortran/40628] Assignment using "= trim(string)": Optimize "trim" away
2009-07-03 7:16 [Bug fortran/40628] New: Assignment using "= trim(string)": Optimize "trim" away burnus at gcc dot gnu dot org
@ 2009-07-05 9:14 ` fxcoudert at gcc dot gnu dot org
2010-06-18 21:12 ` tkoenig at gcc dot gnu dot org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: fxcoudert at gcc dot gnu dot org @ 2009-07-05 9:14 UTC (permalink / raw)
To: gcc-bugs
--
fxcoudert at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2009-07-05 09:13:58
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40628
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug fortran/40628] Assignment using "= trim(string)": Optimize "trim" away
2009-07-03 7:16 [Bug fortran/40628] New: Assignment using "= trim(string)": Optimize "trim" away burnus at gcc dot gnu dot org
2009-07-05 9:14 ` [Bug fortran/40628] " fxcoudert at gcc dot gnu dot org
@ 2010-06-18 21:12 ` tkoenig at gcc dot gnu dot org
2010-06-18 21:19 ` burnus at gcc dot gnu dot org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: tkoenig at gcc dot gnu dot org @ 2010-06-18 21:12 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from tkoenig at gcc dot gnu dot org 2010-06-18 21:12 -------
Mine.
--
tkoenig at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |tkoenig at gcc dot gnu dot
|dot org |org
Status|NEW |ASSIGNED
Last reconfirmed|2009-09-29 05:52:11 |2010-06-18 21:12:29
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40628
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug fortran/40628] Assignment using "= trim(string)": Optimize "trim" away
2009-07-03 7:16 [Bug fortran/40628] New: Assignment using "= trim(string)": Optimize "trim" away burnus at gcc dot gnu dot org
2009-07-05 9:14 ` [Bug fortran/40628] " fxcoudert at gcc dot gnu dot org
2010-06-18 21:12 ` tkoenig at gcc dot gnu dot org
@ 2010-06-18 21:19 ` burnus at gcc dot gnu dot org
2010-07-25 19:32 ` tkoenig at gcc dot gnu dot org
2010-07-25 19:37 ` tkoenig at gcc dot gnu dot org
4 siblings, 0 replies; 6+ messages in thread
From: burnus at gcc dot gnu dot org @ 2010-06-18 21:19 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from burnus at gcc dot gnu dot org 2010-06-18 21:19 -------
In the link, one also finds
trim(str1) == trim(str2)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40628
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug fortran/40628] Assignment using "= trim(string)": Optimize "trim" away
2009-07-03 7:16 [Bug fortran/40628] New: Assignment using "= trim(string)": Optimize "trim" away burnus at gcc dot gnu dot org
` (2 preceding siblings ...)
2010-06-18 21:19 ` burnus at gcc dot gnu dot org
@ 2010-07-25 19:32 ` tkoenig at gcc dot gnu dot org
2010-07-25 19:37 ` tkoenig at gcc dot gnu dot org
4 siblings, 0 replies; 6+ messages in thread
From: tkoenig at gcc dot gnu dot org @ 2010-07-25 19:32 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from tkoenig at gcc dot gnu dot org 2010-07-25 19:31 -------
Subject: Bug 40628
Author: tkoenig
Date: Sun Jul 25 19:31:37 2010
New Revision: 162519
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=162519
Log:
2010-07-25 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/40628
* Make-lang.in: Add fortran/frontend-passes.o.
* gfortran.h: Add prototype for gfc_run_passes.
* resolve.c (gfc_resolve): Call gfc_run_passes.
* frontend-passes.c: New file.
2010-07-25 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/40628
* trim_optimize_1.f90: New test.
* character_comparision_1.f90: New test.
Added:
trunk/gcc/fortran/frontend-passes.c
trunk/gcc/testsuite/gfortran.dg/character_comparison_1.f90
trunk/gcc/testsuite/gfortran.dg/trim_optimize_1.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/Make-lang.in
trunk/gcc/fortran/gfortran.h
trunk/gcc/fortran/resolve.c
trunk/gcc/testsuite/ChangeLog
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40628
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug fortran/40628] Assignment using "= trim(string)": Optimize "trim" away
2009-07-03 7:16 [Bug fortran/40628] New: Assignment using "= trim(string)": Optimize "trim" away burnus at gcc dot gnu dot org
` (3 preceding siblings ...)
2010-07-25 19:32 ` tkoenig at gcc dot gnu dot org
@ 2010-07-25 19:37 ` tkoenig at gcc dot gnu dot org
4 siblings, 0 replies; 6+ messages in thread
From: tkoenig at gcc dot gnu dot org @ 2010-07-25 19:37 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from tkoenig at gcc dot gnu dot org 2010-07-25 19:37 -------
Fixed on trunk. Closing.
--
tkoenig at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40628
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2010-07-25 19:37 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2009-07-03 7:16 [Bug fortran/40628] New: Assignment using "= trim(string)": Optimize "trim" away burnus at gcc dot gnu dot org
2009-07-05 9:14 ` [Bug fortran/40628] " fxcoudert at gcc dot gnu dot org
2010-06-18 21:12 ` tkoenig at gcc dot gnu dot org
2010-06-18 21:19 ` burnus at gcc dot gnu dot org
2010-07-25 19:32 ` tkoenig at gcc dot gnu dot org
2010-07-25 19:37 ` tkoenig 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).