Author: Robert Hyatt
Date: 10:19:46 02/16/05
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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. 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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