Author: Gian-Carlo Pascutto
Date: 10:25:43 06/30/04
Go up one level in this thread
On June 30, 2004 at 13:13:19, Matthew Hull wrote: >On June 30, 2004 at 13:08:48, Gian-Carlo Pascutto wrote: > >>On June 30, 2004 at 13:06:24, Matthew Hull wrote: >> >>>On June 30, 2004 at 12:57:26, Vincent Diepeveen wrote: >>> >>>>Hello, >>>> >>>>For diep moving from 32 to 64 bits is not so interesting. But the 8==>16 >>>>registers is. >>>> >>>>All tested with same diep version : >>>> >>>>at windows 64 bits : >>>> >>>>net2003 32 bits : 135k nps >>>>amd SDK 64 bits : 130k nps >>>>gcc 3.4 32 bits : 130k nps (with pgo) >>>> >>>>at linux (gentoo) 64 bits : >>>>gcc 3.3.3 64 bits : 140k nps >>>> >>>>So it's trivial that moving from 8 to 16 registers increased it by 10k nps, >>>>despite also losing to larger instruction sizes. >>> >>> >>> >>>If you had gone with bitboards, you would have seen a 47% increase. >> >>Which would have been no help if it had slowed him down 47% in 32 bit mode to >>begin with. > > >Do you think bitboards are that much slower on 32 bit machines? The question is not easy to answer because writing the exact same program with and without bitboards is silly, I just pointed out the backside of your statement. We had one application get a 200% performance increase (3x as fast) going from 32 to 64 bit. We would have not gotten this tremendous 'improvement' if the 32 bit code had been better to start with. -- GCP
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