[Vm-dev] FloatMathPlugin crashes the VM if compiled with gcc optimization

[Igor Stasenko]

On 26 December 2010 23:32, Andreas Raab <andreas.raab at gmx.de> wrote:
>
> On 12/26/2010 10:19 PM, Igor Stasenko wrote:
>>
>> low level C code which pretending to know how to do it 'right' +
>> C compiler , who also knowing how to do it 'right' ===>>  mess in result
>> :)
>
> Well, I'm sorry but the C code does bit manipulation according to IEEE 754
> so it's hard to blame that code for overly aggressive gcc optimizations.
> FWIW, the FloatMathPlugin must also be compiled with -mno-fused-madd as this
> would produce another source of differences depending on whether a compiler
> chooses to use fmadd or not.
>
ok. added :)

Btw, i found another library:
http://www.jhauser.us/arithmetic/SoftFloat.html

looks like this one don't have problems with gcc -O2,
because at "SoftFloat speed" it says that it is compiled with this option.


> Cheers,
>  - Andreas
>



-- 
Best regards,
Igor Stasenko AKA sig.