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Subject: Re: speed question about programs?

Author: Flemming Rodler

Date: 10:11:04 05/26/00

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On May 26, 2000 at 10:25:39, blass uri wrote:

>I understand that searching for the value of a varaible can take more time if
>the variable is not in the CPU(not register variable).
>
>I have some questions
>
>1)Is searching for the value of a register variable takes the same time in case
>of more variables when there are more variables in the CPU.
>
>2)Is searching for the value of a variable takes more time in case of more
>variables if the variable is not in the CPU.
>
>3)How many register variables can be saved in the registers of the CPU
>4)How much faster is using register variables relative to using not register
>variables?

Using the register specifier in C does nothing in my experience since todays
compilers are extremely good at figuring out by themselves which variables
should be put into registers.


>
>My logic say that searching for the value of the variable should take more time
>in every case when there are more variables because searching for a word in a
>big dictionary takes more time than searching for a word in a small dictionary
>but I do not know if computers search in a "dictionary" for variables or use
>another method.
>
>I understand that the reply to questions 3 and 4 may be dependent on the
>hardware
>
>Uri



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