Author: Severi Salminen
Date: 03:59:03 02/02/01
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>But i don't see the speedup when compared to crafty when >talking about branches here. You use on average 2 JZ instructions >for each move. Let's do a very non-educated guess and estimate >that from each 2 JZ instructions at least 1 is mispredicted. > >That means that you lose in number of clocks (at least) on the > P3 : 10 > P4 : 20 > >So you waste 10 CLOCKS on a P3!!!!!!! >Just to get a single instruction out of a bitboard! >Added to that is a lot of extra overhead also, as you use >a lot of complex instructions. psllq i need to figure out what >it does but perhaps you can already post that!. Could you give me a basic rule of thumb for this branching stuff. The less we have jumps the faster we are? And what about when processor predicts right the destination? Severi
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