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Subject: Re: What is the speed difference that programs earn from 64 bit systems

Author: Gerd Isenberg

Date: 02:28:49 04/30/05

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On April 30, 2005 at 03:50:30, Volker Böhm wrote:

>Hi Uri,
>
>maybe I´ve done something wrong, but for spike there isn´t an improvement by
>compiling for 64 bit. I think that only chess programs using bitboard will gain
>much speed by 64 bit.
>
>Greetings Volker

Hi Volker,

i would expect an significant improvement even for none bitboard programs -
simply due to the doubled register file and smarter cache and branch prediction
heuristics.

OTOH there are the drawbacks with 64-bit pointers (including this-pointer) and
signed indices.

Cheers,
Gerd



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