[Vm-dev] Bug in primitive 551 (SmallFloat64>> truncated)

[Juan Vuletich]

Hi Nicolas,

Done. It is https://github.com/OpenSmalltalk/opensmalltalk-vm/issues/376

Thanks,

-- 
Juan Vuletich
www.cuis-smalltalk.org
https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev
https://github.com/jvuletich
https://www.linkedin.com/in/juan-vuletich-75611b3
@JuanVuletich



On 3/12/2019 1:05 PM, Nicolas Cellier wrote:
> Hi Juan,
> good find. Can you open an issue on github opensmalltalk repo?
>
> Le mar. 12 mars 2019 à 16:05, Juan Vuletich <JuanVuletich at zoho.com 
> <mailto:JuanVuletich at zoho.com>> a écrit :
>
>
>     Hi Folks,
>
>     I just found a bug in an edge case in #truncated primitive in 64 bits
>     Cog Spur (tested on Linux, both in Cuis and Squeak). It is when
>     #truncated a Float that is slightly larger than SmallInteger maxVal.
>
>     SmallInteger maxVal   -->  1152921504606846975
>
>     If we take (1152921504606846975.0 predecessor), to ensure a Float
>     that
>     still fits in a SmallInteger, everything works fine:
>
>     1152921504606846975.0 predecessor asTrueFraction   --> 
>     1152921504606846848
>     1152921504606846975.0 predecessor asTrueFraction   -->  class
>     SmallInteger
>     1152921504606846975.0 predecessor truncated   -->  1152921504606846848
>
>     But taking 1152921504606846976.0:
>
>     1152921504606846976.0 asTrueFraction   -->  1152921504606846976
>     (correct
>     result)
>     1152921504606846976.0 asTrueFraction class   --> 
>     LargePositiveInteger
>     (ok. Doesn't fit in SmallInteger)
>     1152921504606846976.0 truncated   -->  -1152921504606846976
>
>     The primitive is answering SmallInteger minVal, (a negative
>     number!) but
>     it should fail, as the correct result doesn't fit in a SmallInteger.
>
>     Thanks,
>
>     -- 
>     Juan Vuletich
>     www.cuis-smalltalk.org <http://www.cuis-smalltalk.org>
>     https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev
>     https://github.com/jvuletich
>     https://www.linkedin.com/in/juan-vuletich-75611b3
>     @JuanVuletich
>
>


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