Il 02/06/2013 16:50, Peter Maydell ha scritto:
> On 2 June 2013 15:36, Paolo Bonzini <pbonz...@redhat.com> wrote:
>> This should work:
>>
>> int64_t h;
>> if (!n) {
>> return a;
>> }
>> h = a.hi >> n;
>
> This is undefined for n >= 64.
Yes, it has to be a.hi >> (n & 63).
> I would suggest looking at fpu/softfloat-macros.h:shift128Right()
> except that that has at least one clearly dubious thing in it
> (a check for "count < 64" in an else case that can't be reached
> if count < 64)...
It's a bit different in that I want an arithmetic right shift.
Paolo
