Re: [Qemu-devel] [PATCH v3 19/22] fpu/softfloat: re-factor scalbn

[Alex Bennée]

Richard Henderson <address@hidden> writes:

> On 01/24/2018 05:13 AM, Alex Bennée wrote:
>> +/* Multiply A by 2 raised to the power N.  */
>> +static FloatParts scalbn_decomposed(FloatParts a, int n,
>> +                                          float_status *s)
>> +{
>> +    if (a.cls == float_class_normal) {
>> +        a.exp += n;
>> +    }
>> +    return a;
>> +}
>
> ...
>
>> -    if ( aExp == 0x7FF ) {
>> -        if ( aSig ) {
>> -            return propagateFloat64NaN(a, a, status);
>
> This is where we used to raise inexact.
> In the new function we need to handle this as in round_to_int.

Why is the handling in round_canonical not good enough for this?

--
Alex Bennée