From: Jeffrey Schwab <jeff@...>
Date: 2006-10-26T22:45:13+09:00
Subject: Re: simple math question

Ken Bloom wrote:
> On Thu, 26 Oct 2006 01:19:08 +0000, Jeffrey Schwab wrote:
> 
>> Paul Lutus wrote:
>>> Brad Tilley wrote:
>>>
>>>> Thanks for all the examples guys! Being Ruby, I thought there might be
>>>> some super simple method that just magically did this. I'll stick with
>>>> the old-fashioned modulo test.
>>> If speed matters, the modulo test is way slower than testing the LSB.
>> Do you mean on a specific architecture, or is there a Ruby-specific 
>> reason for one to be slower than the other?
> 
> Modulo uses division hardware, which is slower than the hardware for
> bitwise operations.

On what modern architecture?  (I write x86 firmware.)