Re: [hatari-devel] FPU update

[Toni Wilen <twilen@xxxxxxxxxx>]

>> Quick test results:
>> 
>> FMOVEM does not do anything (as documented), FMOVEM to register
>> and FMOVEM from same register back to memory: same bit pattern.
>> 
>> Any arithmetic operation seems to normalize it automatically. I
>> tried FNEG, FABS, FADD (with another register containing zero),
>> register content was normalized even if it was source for FADD.
>> 
> Thank you for the quick test! In this case I need to add that
> automatic normalization to fp_arithmetic. I guess 68040/68060 will
> raise unimplemented datatype (pre) exception. That would make sense,
> wouldn't it?

Yeah, which is already supported in get_fp_value() (for source values).

I guess cleanest way is to replace "fault_if_unimplemented_680x0" before
arithmetic call with function that does first unimplemented check and
then normalizations if neeeded.