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-freduce-all-*
- From: "Michael T. Babcock" <mtb at mikebabcock dot ca>
- To: gcc at gcc dot gnu dot org
- Date: Wed, 08 Sep 2004 23:57:33 -0400
- Subject: -freduce-all-*
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
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