Re: [Qemu-devel] [PATCH 0/7] target-m68k: implement 680x0 FPU

[Laurent Vivier]

Le 18/01/2017 à 22:42, Richard Henderson a écrit :
> On 01/18/2017 01:05 PM, Laurent Vivier wrote:
>> This series modifies the original ColdFire FPU implementation
>> to use floatx80 instead of float64 internally as this
>> is the native datatype for 680x0. I didn't keep the float64
>> type for ColdFire, but if someone thinks it's required I
>> can update this series in this way.
> 
> I think at minimum you'll need to round to float64.  But this control is
> also needed for 68040 FPU, so probably you can use the same helpers.
> 
> I'm thinking something like
> 
> void helper_foo_d(args);
> {
>   ...
>   r80 = floatx80_foo(args);
>   r64 = floatx80_to_float64(r80, &env->fp_status);
>   r80 = float64_to_floatx80(r64, &env->fp_status);
>   [store r80]
>   ...
> }
> 
> since iirc 68040 has fadd.d, fadd.s to go with fadd.

OK, I will modify this part.

Thanks,
Laurent