#748: 32bit Number Limit and Conversion -----------------------------+---------------------------------------------- Reporter: lp@… | Owner: lsansonetti@… Type: defect | Status: new Priority: major | Milestone: MacRuby 0.7 Component: MacRuby | Keywords: 32bit number -----------------------------+---------------------------------------------- Description changed by martinlagardette@…: Old description:
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
New description: 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 }}}
-- -- Ticket URL: <http://www.macruby.org/trac/ticket/748#comment:1> MacRuby <http://macruby.org/>