From: Heesob Park <phasis@...>
Date: 2013-05-21T10:23:19+09:00
Subject: Re: RubyInstaller 2.0.0-p195 released

Hi,

2013/5/21 Rob Biedenharn <rob@agileconsultingllc.com>:
>
> On 2013-May-20, at 12:24 , Jabari Z. wrote:
>
>> I installed ruby-2.0.0-p195 on Windows 7 Premium Home Edition (64-bit)
>> but it has 32-bit numbers versus 64-bit ones.
>>
>> So if you do this you get
>>> (2**32).class
>> =>  Bignum
>>
>> For a 64-bit build numbers should be Fixnum all the way up to (2**63-1).
>>
>> On my VirtualBox install of Linux Mint 14 (64-bit) that is what I get
>> for rvm install of ruby-2.0.0-p195
>
> Just ask ruby for the size of a known Fixnum:
>
> $ ruby -v -e 'puts 1.size'
> ruby 2.0.0p195 (2013-05-14 revision 40734) [x86_64-darwin11.4.2]
> 8
>
> Fixnum#size returns the number of bytes in the representation. On a 32-bit system, you'd get 1.size==4 instead.
>
> -ROb

Windows uses LLP64 data models, which maintains compatibility with
32-bit code by leaving both int and long as 32-bit.

C:\Users\phasis>ruby -ve 'puts 1.size'
ruby 2.0.0p195 (2013-05-14) [i386-mingw32]
4

C:\Users\phasis>ruby -ve 'puts 1.size'
ruby 2.0.0p195 (2013-05-14) [x64-mingw32]
4

C:\Users\phasis>ruby -ve "puts ['a'].pack('P').length"
ruby 2.0.0p195 (2013-05-14) [i386-mingw32]
4

C:\Users\phasis>ruby -ve "puts ['a'].pack('P').length"
ruby 2.0.0p195 (2013-05-14) [x64-mingw32]
8

Refer to http://en.wikipedia.org/wiki/LLP64#64-bit_data_models

Regards,
Park Heesob