[MacRuby-devel] 32 bit Number Bug

[Laurent Sansonetti]

Bonjour Louis-Philippe,

Could you open a ticket on the tracker for that?

32-bit mode is really not well tested at this point so it doesn't surprise me there are a few bugs around. 

Laurent

On Jun 14, 2010, at 10:28 AM, Louis-Philippe wrote:

> Hi folks,
> 
> there seems to be a bug in the 32bit release of 0.6 with numbers
> 
> arch -arch i386 macirb --simple-prompt
> >> 0x44485250                                                                           # reality check
> => 1145590352
> >> NSNumber.numberWithInt(0x44485250)                              # then see all 32 NSNumber are weird...
> => 71848528
> >> NSNumber.numberWithFloat(0x44485250)
> => 1145590272.0
> >> NSNumber.numberWithInt(1145590352)
> => 71848528
> >> NSNumber.numberWithFloat(1145590352)
> => 1145590272.0
> 
> versus:
> 
> arch -arch x86_64 macirb --simple-prompt
> >> 0x44485250                                                                          # reality check
> => 1145590352
> >> NSNumber.numberWithInt(0x44485250)
> => 1145590352
> >> NSNumber.numberWithFloat(0x44485250)
> => 1145590400.0
> >> NSNumber.numberWithInt(1145590352)
> => 1145590352
> >> NSNumber.numberWithFloat(1145590352.0)                      # this is weird again...
> => 1145590400.0
> 
> to look a bit further, the bug turning point seems to be here for the 32bit release:
> 
> >> NSNumber.numberWithInt(536870910)
> => 536870910
> >> NSNumber.numberWithInt(536870911)
> => 536870911
> >> NSNumber.numberWithInt(536870912)
> => -536870912
> >> NSNumber.numberWithInt(536870913)
> => -536870911
> 
> and here in the 64 bit:
> 
> >> NSNumber.numberWithInt(2147483646)
> => 2147483646
> >> NSNumber.numberWithInt(2147483647)
> => 2147483647
> >> NSNumber.numberWithInt(2147483648)
> => -2147483648
> >> NSNumber.numberWithInt(2147483649)
> => -2147483647
> 
> 
> also an other detail:
> 
> 32bit turning point:
> >> 536870911 / 16
> => 33554431
> 
> 64bit turning point:
> >> 2147483647 / 64
> => 33554431
> 
> Is there a workaround for these conversion problem?
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