Remove real type

[Lars T. Kyllingstad]

strtr wrote:
> Robert Jacques Wrote:
> 
>> On Wed, 21 Apr 2010 23:48:20 -0300, strtr <strtr at spam.com> wrote:
>>
>>> abcd Wrote:
>>>
>>>> On the other hand, being an engineer, I use the reals all the time and
>>>> want them to stay. I would use the max precision supported by the cpu
>>>> then fixed precision like double any day.
>>>>
>>>> -sk
>>> For me it's the exact opposite, reproducibility/portability is key. My  
>>> problem with real is that I am always afraid my floats get upgraded to  
>>> them internally somewhere/somehow.
>> You do realize that the x86 floating point unit _always_ promotes floats  
>> and doubles to reals internally? The only way around it is for the  
>> compiler to use MMX/SSE unit for everything instead.
> 
> Does this mean that float calculations are always off between intel and amd as intel uses 80bit reals?
> (x86 is my target audience)

No, I believe AMD processors also use 80 bits of precision, since they 
also implement the x86/x87 instruction set.

-Lars