[ECOS] Re: Floating point representation with Ecos

Sergei Organov osv@javad.com
Thu Mar 2 11:26:00 GMT 2006


Grant Edwards <grante@visi.com> writes:

> In gmane.os.ecos.general, you wrote:
>
>> ARM7 working in little-endian mode has big-endian order of 2 4-byte
>> words in double and little-endian order of bytes inside the words, while
>> ix86 has little-endian-everything. This doesn't depend on eCos or
>> Windows, -- it's entirely hardware incompatibility.
>
> There are ARM7 parts that do double-precision FP in hardware?

Yes, I'm working with one, but it's custom ARM implementation built-in
into an ASIC. AFAIR, there was a chip, ARM7500FE (if I remember
correctly), that has been announced a few years ago and had FPA unit,
but I have no idea if it has been in fact manufactured.

Anyway, even if it's not hardware but software FP emulator, I bet it
uses standard ARM FP layout.

-- Sergei.




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