* -freduce-all-*
@ 2004-09-09 3:57 Michael T. Babcock
2004-09-11 10:54 ` -freduce-all-* Toon Moene
0 siblings, 1 reply; 2+ messages in thread
From: Michael T. Babcock @ 2004-09-09 3:57 UTC (permalink / raw)
To: gcc
I was doing some work with ATLAS and running the author's xmm_gc3
benchmark and noticed the comments associated with the
-freduce-all-(movables|givs) options. For what its worth (best speeds
are cited):
Without: (/usr/local/gcc-3.4.2/bin/gcc -O3 -fomit-frame-pointer
-fforce-addr -march=pentium -mtune=athlon -ftracer -funit-at-a-time
-fbranch-probabilities -fsched2-use-superblocks)
./xmm_gc3
ALGORITHM NB REPS TIME MFLOPS
========= ===== ===== ========== ==========
atlasmm 60 3000 0.700 1851.71
With: (/usr/local/gcc-3.4.2/bin/gcc -O3 -fomit-frame-pointer
-fforce-addr -march=pentium -mtune=athlon -ftracer -funit-at-a-time
-fbranch-probabilities -fmove-all-movables -freduce-all-giv)
./xmm_gc3
ALGORITHM NB REPS TIME MFLOPS
========= ===== ===== ========== ==========
atlasmm 60 3000 0.762 1701.05
Each compile above was preceded by one with "-ftracer| -fprofile-arcs
-fprofile-values -fvpt" and then the program was run three times before
recompiling with the above options and re-running.
Please CC on replies/comments.
Also note, I have no connection to the authorship of the benchmarks or
software above.
--
Michael T. Babcock
| ||
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: -freduce-all-*
2004-09-09 3:57 -freduce-all-* Michael T. Babcock
@ 2004-09-11 10:54 ` Toon Moene
0 siblings, 0 replies; 2+ messages in thread
From: Toon Moene @ 2004-09-11 10:54 UTC (permalink / raw)
To: Michael T. Babcock; +Cc: gcc
Michael T. Babcock wrote:
> I was doing some work with ATLAS and running the author's xmm_gc3
> benchmark and noticed the comments associated with the
> -freduce-all-(movables|givs) options. For what its worth (best speeds
> are cited):
>
> Without: (/usr/local/gcc-3.4.2/bin/gcc -O3 -fomit-frame-pointer
> -fforce-addr -march=pentium -mtune=athlon -ftracer -funit-at-a-time
> -fbranch-probabilities -fsched2-use-superblocks)
> ./xmm_gc3
> ALGORITHM NB REPS TIME MFLOPS
> ========= ===== ===== ========== ==========
> atlasmm 60 3000 0.700 1851.71
>
> With: (/usr/local/gcc-3.4.2/bin/gcc -O3 -fomit-frame-pointer
> -fforce-addr -march=pentium -mtune=athlon -ftracer -funit-at-a-time
> -fbranch-probabilities -fmove-all-movables -freduce-all-giv)
> ./xmm_gc3
> ALGORITHM NB REPS TIME MFLOPS
> ========= ===== ===== ========== ==========
> atlasmm 60 3000 0.762 1701.05
Note that you didn't use -fsched2-use-superblocks in your second
compile, so they're not completely comparable and do not _only_ test the
addition of -fmove-all-movables -freduce-all-givs.
That said, I think I'm going to propose a patch to remove
-fmove-all-movables and -freduce-all-givs because they were only useful
in an old, and soon to be replaced, part of loop optimization.
--
Toon Moene - e-mail: toon@moene.indiv.nluug.nl - phone: +31 346 214290
Saturnushof 14, 3738 XG Maartensdijk, The Netherlands
Maintainer, GNU Fortran 77: http://gcc.gnu.org/onlinedocs/g77_news.html
A maintainer of GNU Fortran 95: http://gcc.gnu.org/fortran/
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