Re: Calculator problem on ARM board

[Bill Gatliff <bgat@xxxxxxxxxxxxxxx>]

Russell King - ARM Linux wrote:
> On Wed, Nov 05, 2008 at 08:13:20AM -0600, Bill Gatliff wrote:
>> kartikay Malhotra wrote:
>>> Is there a problem in the compiler, or is double precision arithmetic
>>> incorrect? The same application complied for x86 gives no error.
>> Well, if both systems conform to ieee695 then the results should be identical.
>> Is one machine soft-float and the other using an FPU?  Note that for ARM, the
>> FPU might be emulated by kernel code, so you are actually using a different
>> runtime implementation than x86.  For apples-to-apples comparisons, use
>> soft-float everywhere.
> 
> Umm, that doesn't follow.
> 
> The ARM GCC soft-float implementation is an assembly code FP implementation
> by Nicolas.  It isn't remotely useful on x86.  So, soft-float on x86 and
> soft-float on ARM would still be two different implementations.

Oops.  I recall seeing some C implementation somewhere, and I guess that turned
into "gosh, everyone must be using that!".  My bad.


b.g.
-- 
Bill Gatliff
bgat@xxxxxxxxxxxxxxx

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