Author: Robert Hyatt
Date: 12:26:50 02/16/05
Go up one level in this thread
On February 16, 2005 at 15:15:53, Frank Phillips wrote: >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 > No. Sorry. I completely overlooked the AMD-64 in your text as that has become so common to see over the past year. ICC is 32 bits only although it will be 64 bit before long... > >>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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