Author: Frank Phillips
Date: 12:15:53 02/16/05
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On February 16, 2005 at 13:19:46, Robert Hyatt wrote: >On February 16, 2005 at 13:09:14, Frank Phillips wrote: > >>Has anybody got any experience with g++ 3.4 for amd64 (x86_64) - for Linux? >> >>I have been using the profile generated optimisation option, but the code it >>produces is no faster then with simple -O3. >> >>I simply compile with -fprofile-generate >>then run, >>then recompile with -fprofile-use. >> >>The relevant *.gcno, *.gcda files are produced. Must be doing something >>wrong..... >> >>Frank > > >It has never worked well for me. In fact, it usually crashes when I try to do >this for crafty. ICC (Intel's compiler) works fine and that is what I use >myself. > Oh... the last version of ICC I used produced fast 32 bit code. Does it now do amd 64 bit ? Frank >You need a good test set of data so that it can accurately predict each branch >and move code to optimize branch prediction at run-time... The positions you >test need to pretty accurately represent what happens in a real game.
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