Author: Michel Langeveld
Date: 23:36:11 10/23/04
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On October 24, 2004 at 00:45:21, Eugene Nalimov wrote: >On October 23, 2004 at 16:58:22, Anthony Cozzie wrote: > >>... >> Compiling a program in 64 bits will give any program at least a 10-15% >>performance increase just from the extra registers. > >One of the SpecInt2k programs slows down when compiled in 64-bit mode by 30-40%. > >Thanks, >Eugene So 11 programs get's faster and one is slower. Good to know. I found this link also interesting: http://www.suse.de/~aj/SPEC/ Suse checks out daily the gcc from cvs and compiles the spec test with it. I came to the following preliminary findings: 1) In order of performance from low to high for Crafty we have: GCC 2.95, 3.0, 3.1 2) Probably the fastest compiler for Crafty is not GCC 3.1. On http://www.suse.de/~aj/SPEC/CINT/d-permanent/index.html a compiler peaked above 600 once. I have no idea if this compiler did produce valid results. 3) The following GCC-flags seems work best for Crafty: -O2 -march=athlon -fomit-frame-pointer 4) On http://www.suse.de/~aj/SPEC/CINT/d-permanent/index.html it look likes the performance goes down for Crafty each release
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