Hi,

Thanks.  I fixed it.


Brian Eng wrote:
> $ uname -a
> Darwin pp1 8.7.0 Darwin Kernel Version 8.7.0: Fri May 26 15:20:53 PDT
> 2006; root:xnu-792.6.76.obj~1/RELEASE_PPC Power Macintosh powerpc
> 
> $ cat numtest.rb
> temp = 2**30 - 5
> 5.times do
>         temp += 1
>         print temp, " ", temp.class, "\n"
> end
> 
> $ ./ruby-yarv -v numtest.rb
> ruby 2.0.0 (Base: Ruby 1.9.0 2006-04-08) [powerpc-darwin8.7.0]
> YARVCore 0.4.1 Rev: 528 (2006-08-05) [opts: [direct threaded code]
> [inline method cache] ]
> 1073741820 Fixnum
> 1073741821 Fixnum
> 1073741822 Fixnum
> 1073741823 Fixnum
> 6 Fixnum
> 
> This problem only happens when doing small increments, large ones work
> fine.
> 
> $ cat numtest2.rb
> temp = 2
> 5.times do
>         temp **= 2
>         print temp, " ", temp.class, "\n"
> end
> 
>  $ ./ruby-yarv -v numtest2.rb
> ruby 2.0.0 (Base: Ruby 1.9.0 2006-04-08) [powerpc-darwin8.7.0]
> YARVCore 0.4.1 Rev: 528 (2006-08-05) [opts: [direct threaded code]
> [inline method cache] ]
> 4 Fixnum
> 16 Fixnum
> 256 Fixnum
> 65536 Fixnum
> 4294967296 Bignum
> 
> Using the Ruby that comes with OS X 10.4
> 
> $ ruby -v numtest.rb
> ruby 1.8.2 (2004-12-25) [powerpc-darwin8.0]
> 1073741820 Fixnum
> 1073741821 Fixnum
> 1073741822 Fixnum
> 1073741823 Fixnum
> 1073741824 Bignum
> 
> Setting #define OPT_SPECIALISED_INSTRUCTION  0 (default is 1) in
> vm_opts.h seems to fix problem.
> 
> $ ./ruby-yarv -v numtest.rb
> ruby 2.0.0 (Base: Ruby 1.9.0 2006-04-08) [powerpc-darwin8.7.0]
> YARVCore 0.4.1 Rev: 528 (2006-08-05) [opts: [direct threaded code]
> [inline method cache] ]
> 1073741820 Fixnum
> 1073741821 Fixnum
> 1073741822 Fixnum
> 1073741823 Fixnum
> 1073741824 Bignum
> 
> Is it a problem just with OS X or maybe PPC computers?

-- 
// SASADA Koichi at atdot dot net


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