From: Ned Konz <ned@...>
Date: 2001-08-04T15:36:56+09:00
Subject: [ruby-talk:19111] Re: Endianness and integer indexing

On Friday 03 August 2001 11:08 pm, you wrote:

> You mean "& 1", right? As in, " if (a & 1)==0 then
>    print 'even' ; else print 'odd' ; end;".

Sorry, yes, of course that's what I meant. Fingers too fast tonight (or brain 
too slow).

> 10000.times { if
>  
> 5213451352345234523452345234523452345234523612345123412341234123412341234[0
>] == 0 ; then a=true; else a=false; end }
>
> Use the Unix 'time' command or the profiler, either way.

I get 5.5 microseconds per repetition. i.e. 1e6 reps was a little over 5 
seconds. This is with a 466/533 Celeron. How long is it taking you?

Interestingly, this is about 3x as fast as Squeak (Smalltalk), which actually 
has a LargeIntegers plugin (written in C) that's there for digital signature 
algorithms. Their bitAnd: method is a primitive in this plugin. Perhaps they 
did something wrong...

-- 
Ned Konz
currently: Stanwood, WA
email:     ned@bike-nomad.com
homepage:  http://bike-nomad.com