From: Maciej Tomaka <lunatyq@...>
Date: 2008-08-26T20:23:23+09:00
Subject: Re: BigDecimal with Float comparision bug.

Maciej Tomaka wrote:
> Stefano Crocco wrote:
>> On Tuesday 26 August 2008, Maciej Tomaka wrote:
>>> Decimal:
>>> What do you think about it?
>>>
>>> Regards
>> 
>> It works correctly for me (ruby 1.8.7-p72) on gentoo linux (linux 
>> 2.6.25, gcc
>> 4.3.1). Which version of ruby are you using?
>> 
>> Stefano
> 
> It worked previously for me now it does not work.
> Sorry , I have forgot to write it:
> 
> The test was made on linux x64 ruby version:
> 
> Fails:
> 
> ruby 1.8.6 (2007-09-24 patchlevel 111) [x86_64-linux]
> ruby 1.8.5 (2006-08-25) [x86_64-linux]
> 
> Good:
> 
> ruby 1.8.6 (2007-06-07 patchlevel 36) [i386-linux]
> ruby 1.8.6 (2007-03-13 patchlevel 0) [i386-freebsd4]
> ruby 1.8.5 (2006-08-25) [i386-freebsd6]
> ruby 1.8.4 (2005-12-24) [i386-freebsd4]

Full tests gave:

ruby 1.8.6 (2007-03-13 patchlevel 0) [i386-freebsd4]
ruby 1.8.5 (2006-08-25) [i386-freebsd6]
ruby 1.8.2 (2004-12-25) [i386-freebsd5]

>> (1..1000).select { |d| BigDecimal.new("#{d}.0") != d.to_f }.size
=> 304

ruby 1.8.6 (2007-06-07 patchlevel 36) [i386-linux]
>> (1..1000).select { |d| BigDecimal.new("#{d}.0") != d.to_f }.size
=> 141

ruby 1.8.5 (2006-08-25) [x86_64-linux]
ruby 1.8.6 (2007-09-24 patchlevel 111) [x86_64-linux]
>> (1..1000).select { |d| BigDecimal.new("#{d}.0") != d.to_f }.size
=> 414

I am compiling most recent version of ruby now.

Regards




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