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* [Bug rtl-optimization/13712] Executable runs 25% slower than when compiled with INTEL compiler
[not found] <bug-13712-7730@http.gcc.gnu.org/bugzilla/>
@ 2006-02-27 14:22 ` steven at gcc dot gnu dot org
2006-02-27 14:41 ` steven at gcc dot gnu dot org
1 sibling, 0 replies; 6+ messages in thread
From: steven at gcc dot gnu dot org @ 2006-02-27 14:22 UTC (permalink / raw)
To: gcc-bugs
------- Comment #17 from steven at gcc dot gnu dot org 2006-02-27 14:22 -------
For -D__NO_MATH_INLINES we're probably not going to make any progress as long
as Uli is the glibc maintainer.
Other than that, this appears to be fixed. Note that ICC has -ffast-math and
SSE as the defaults, where GCC choses for safe math and code that works on any
ix86 CPU, not just the ones with SSE. So if there is still a significant
difference, it is as much philosophical as it is in code generation.
Given the right set of options, GCC can compete with ICC on my Pentium4 box,
and on Uros' box. So there doesn't seem to be a good reason to keep this
report open.
--
steven at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |steven at gcc dot gnu dot
| |org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13712
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug rtl-optimization/13712] Executable runs 25% slower than when compiled with INTEL compiler
[not found] <bug-13712-7730@http.gcc.gnu.org/bugzilla/>
2006-02-27 14:22 ` [Bug rtl-optimization/13712] Executable runs 25% slower than when compiled with INTEL compiler steven at gcc dot gnu dot org
@ 2006-02-27 14:41 ` steven at gcc dot gnu dot org
1 sibling, 0 replies; 6+ messages in thread
From: steven at gcc dot gnu dot org @ 2006-02-27 14:41 UTC (permalink / raw)
To: gcc-bugs
------- Comment #18 from steven at gcc dot gnu dot org 2006-02-27 14:22 -------
.
--
steven at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |WONTFIX
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13712
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug rtl-optimization/13712] Executable runs 25% slower than when compiled with INTEL compiler
2004-01-16 21:11 [Bug c++/13712] New: " william dot crocker at analog dot com
` (2 preceding siblings ...)
2005-04-24 14:18 ` steven at gcc dot gnu dot org
@ 2005-05-07 15:27 ` steven at gcc dot gnu dot org
3 siblings, 0 replies; 6+ messages in thread
From: steven at gcc dot gnu dot org @ 2005-05-07 15:27 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From steven at gcc dot gnu dot org 2005-05-07 15:27 -------
Looks like -D__NO_MATH_INLINES makes gcc produced code much better...
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13712
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug rtl-optimization/13712] Executable runs 25% slower than when compiled with INTEL compiler
2004-01-16 21:11 [Bug c++/13712] New: " william dot crocker at analog dot com
2005-01-23 18:39 ` [Bug rtl-optimization/13712] " steven at gcc dot gnu dot org
2005-01-24 11:16 ` uros at kss-loka dot si
@ 2005-04-24 14:18 ` steven at gcc dot gnu dot org
2005-05-07 15:27 ` steven at gcc dot gnu dot org
3 siblings, 0 replies; 6+ messages in thread
From: steven at gcc dot gnu dot org @ 2005-04-24 14:18 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |NEW
Last reconfirmed|2004-05-30 04:36:06 |2005-04-24 14:18:13
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13712
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug rtl-optimization/13712] Executable runs 25% slower than when compiled with INTEL compiler
2004-01-16 21:11 [Bug c++/13712] New: " william dot crocker at analog dot com
2005-01-23 18:39 ` [Bug rtl-optimization/13712] " steven at gcc dot gnu dot org
@ 2005-01-24 11:16 ` uros at kss-loka dot si
2005-04-24 14:18 ` steven at gcc dot gnu dot org
2005-05-07 15:27 ` steven at gcc dot gnu dot org
3 siblings, 0 replies; 6+ messages in thread
From: uros at kss-loka dot si @ 2005-01-24 11:16 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From uros at kss-loka dot si 2005-01-24 11:16 -------
(In reply to comment #14)
> Where are we standing with this one today?
gcc version 4.0.0 20050124 (experimental)
g++ -O3 -ffast-math y.cc
real 0m27.102s
user 0m26.980s
sys 0m0.016s
g++ -O3 -ffast-math -D__NO_MATH_INLINES y.cc
real 0m23.484s
user 0m23.307s
sys 0m0.076s
g++ -O3 -march=pentium4 -ffast-math -D__NO_MATH_INLINES y.cc
real 0m23.101s
user 0m23.014s
sys 0m0.078s
g++ -O3 -march=pentium4 -mfpmath=sse -ffast-math -D__NO_MATH_INLINES y.cc
real 0m31.650s
user 0m31.605s
sys 0m0.025s
g++ -O3 -march=pentium4 -mfpmath=sse -ffast-math y.cc
real 0m29.068s
user 0m28.863s
sys 0m0.023s
g++ -O3 -march=pentium4 -mfpmath=sse y.cc
real 0m35.343s
user 0m34.848s
sys 0m0.047s
g++ -O3 -march=pentium4 -mfpmath=sse -ffast-math -mno-80387 -D__NO_MATH_INLINES y.cc
*** FAILED: X422 = nan ***
real 2m56.700s
user 2m55.615s
sys 0m0.145s
g++ -O3 -march=pentium4 -mfpmath=sse -mno-80387 -D__NO_MATH_INLINES y.cc
*** TIMEOUT AFTER 3min ***
-mfpmath=sse runs a bit slow.
-mno-80387 IMHO generates wrong code.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13712
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug rtl-optimization/13712] Executable runs 25% slower than when compiled with INTEL compiler
2004-01-16 21:11 [Bug c++/13712] New: " william dot crocker at analog dot com
@ 2005-01-23 18:39 ` steven at gcc dot gnu dot org
2005-01-24 11:16 ` uros at kss-loka dot si
` (2 subsequent siblings)
3 siblings, 0 replies; 6+ messages in thread
From: steven at gcc dot gnu dot org @ 2005-01-23 18:39 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From steven at gcc dot gnu dot org 2005-01-23 18:39 -------
Where are we standing with this one today?
--
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |WAITING
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13712
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2006-02-27 14:22 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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[not found] <bug-13712-7730@http.gcc.gnu.org/bugzilla/>
2006-02-27 14:22 ` [Bug rtl-optimization/13712] Executable runs 25% slower than when compiled with INTEL compiler steven at gcc dot gnu dot org
2006-02-27 14:41 ` steven at gcc dot gnu dot org
2004-01-16 21:11 [Bug c++/13712] New: " william dot crocker at analog dot com
2005-01-23 18:39 ` [Bug rtl-optimization/13712] " steven at gcc dot gnu dot org
2005-01-24 11:16 ` uros at kss-loka dot si
2005-04-24 14:18 ` steven at gcc dot gnu dot org
2005-05-07 15:27 ` steven at gcc dot gnu dot org
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