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Subject: Re: Bitboard question

Author: Roberto Waldteufel

Date: 18:52:42 12/05/98

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That's not quite true, but it is a very common misconception. It is true for
older machines, but these instructions take 1 or 2 clocks only on a PI or a
PPro. A loop is faster on a Pplain or a PMMX or a 486.

It makes optimization a nightmare though if you want to write for all processors
though. I guess you could have two versions of all the bitboard operations, and
get the program to test the CPU to decide which version to call. Personally I
just use the bit scan instructions and hope nobody runs it on ancient boxes.

Best wishes,
Roberto



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