Author: Vincent Diepeveen
Date: 08:59:04 08/06/03
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On August 05, 2003 at 10:45:41, Ricardo Gibert wrote: But did you try gcc 3.3 already with PGO ? (profile guided optimizations) for example at supercomputer i first compile with: CC = gcc3 #CPP = g++ CPPFLAGS = -D_CONSOLE CFLAGS = -O2 -fprofile-arcs -DUNIXPII -DIA64 -DCONFIG_SMP #CFLAGS = -O2 -fbranch-probabilities -DUNIXPII -DIA64 -DCONFIG_SMP #CFLAGS = -O2 -DUNIXPII -DIA64 -DCONFIG_SMP then i run diep SINGLE CPU for 1 hour at openingsposition and let it search and search. quit diep and remove *.o files. then second compile i enable: CFLAGS = -O2 -fbranch-probabilities -DUNIXPII -DIA64 -DCONFIG_SMP then recompile. In which case gcc 3.3 is faster than msvc and intel c++. except at itanium. intel c++ is really a lot faster there which may not come as a suprise to you i bet. >On August 05, 2003 at 09:53:26, Robert Hyatt wrote: > >>On August 05, 2003 at 09:24:07, ERIQ wrote: >> >>>. >> >> >>No. > >I have to disagree. I have performed a number of experiments and found msvc >faster some of the time and gcc faster some of the time. It all depends on a >number of factors that are not completely predictable. > >The experiments consisted of simulataneously dropping CD copies of each compiler >from the roof of my home and observing which CD impacted the ground first. They >never seemed to impact the ground at exactly the same time, but there was no >clear favorite either.
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