--- Comment #15 from jvdelisle at gcc dot gnu dot org 2008-11-26 04:05
---
Not a gfortran frontend issue, so closing.
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jvdelisle at gcc dot gnu dot org changed:
What|Removed |Added
--- Comment #14 from jvdelisle at gcc dot gnu dot org 2008-02-17 04:11
---
Two questions on this PR.
Is there really anything on the gfortran side we can do to make this better or
is it really a middle-end / back-end issue?
Can we close this pr or change the component to other than fo
--- Comment #13 from steven at gcc dot gnu dot org 2007-12-17 06:33 ---
-fipa-pta is broken iirc.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30388
--- Comment #12 from jvdelisle at gcc dot gnu dot org 2007-12-17 06:10
---
Here is a twist on the test case
gfc -O2 -m64 -ffast-math -funroll-all-loops -fipa-pta -fivopts poisson.f
poisson.f:111.72:
pause
--- Comment #11 from fxcoudert at gcc dot gnu dot org 2007-01-23 15:23
---
Well, I can confirm that one the reporter's code, on my i686-linux (Intel(R)
Pentium(R) III CPU family 1266MHz), whatever optimisation flags I give to
gfortran-4.3, "g77-3.4.6 -O" does a better job.
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f
--- Comment #10 from rguenth at gcc dot gnu dot org 2007-01-06 10:17
---
Well, it all boils down to differences in induction variable choices. The
choice made by 3.4 (for i686) doesn't look too good to me compared to 4.1.2
here.
4.1: MFLOPS: 990.4130 time(s): 28.10176
3.4: M
--- Comment #9 from jvdelisle at gcc dot gnu dot org 2007-01-06 05:26
---
Typo on my part:
They are:
-O3
-O2
-O1
-O0
In that order. I apologize
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30388
--- Comment #8 from chat95 at mac dot com 2007-01-06 05:08 ---
Using -O3 -ffast-math in both cases:
Using -O3 -ffast-math in both cases:
Using -O1 -ffast-math in both cases:
Using -O1 -ffast-math in both cases:
what's the difference between theset two?
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http://gcc.gnu.org/bug
--- Comment #7 from jvdelisle at gcc dot gnu dot org 2007-01-06 05:05
---
According to gprof, not unexpected, 97% of time is in the jacoobi routine.
This might warrant further study by the optimizer experts. Certainly not by
me. :)
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3
--- Comment #6 from jvdelisle at gcc dot gnu dot org 2007-01-06 04:44
---
With my system: x86-64 Linux
Using -O3 -ffast-math in both cases:
g77: MFLOPS: 893.198364
gfortran: MFLOPS: 895.7278
Using -O3 -ffast-math in both cases:
g77: MFLOPS: 930.39801
gfortran:
--- Comment #5 from brooks at gcc dot gnu dot org 2007-01-06 02:36 ---
Created an attachment (id=12863)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=12863&action=view)
Original source file (extracted from archive)
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30388
--- Comment #4 from jvdelisle at gcc dot gnu dot org 2007-01-06 02:13
---
Could you please post a gzipped version of the test case?
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30388
--- Comment #3 from chat95 at mac dot com 2007-01-06 00:38 ---
% gfortran42 -o himenobmtxp_m.gfortran42 -O2 -ffast-math -finline-functions
-fomit-frame-pointer -funroll-loops -fexpensive-optimizations himenobmtxp_m.f
% ./himenobmtxp_m.gfortran42
mimax= 257 mjmax= 129
--- Comment #2 from pinskia at gcc dot gnu dot org 2007-01-06 00:33 ---
What happens if you use -O2 instead of -O ?
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30388
--- Comment #1 from chat95 at mac dot com 2007-01-06 00:32 ---
My CPU is :
Jan 6 06:59:54 debussy kernel: ACPI APIC Table:
Jan 6 06:59:54 debussy kernel: Timecounter "i8254" frequency 1193182 Hz
quality 0
Jan 6 06:59:54 debussy kernel: CPU: Intel(R) Pentium(R) 4 CPU 2.40GHz
(2400.10
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