On 14/07/2015 18:45, Aurelien Jarno wrote:
>>> > >
>>> > > mask = 0x7fffull >> (t1 ^ 63)
>>> > >
>>> > > It's simpler to generate it by doing:
>>> > >
>>> > > mask = (1 << t1) - 1
>> >
>> > Using ~(-1 << t1) may let you use an ANDN instruction, and is also the
>> > same nu
On 2015-07-14 18:17, Paolo Bonzini wrote:
>
>
> On 14/07/2015 17:45, Aurelien Jarno wrote:
> > The LWL/LDL instructions mask the GPR with a mask depending on the
> > address alignement. It is currently computed by doing:
> >
> > mask = 0x7fffull >> (t1 ^ 63)
> >
> > It's simpler
On 14/07/2015 17:45, Aurelien Jarno wrote:
> The LWL/LDL instructions mask the GPR with a mask depending on the
> address alignement. It is currently computed by doing:
>
> mask = 0x7fffull >> (t1 ^ 63)
>
> It's simpler to generate it by doing:
>
> mask = (1 << t1) - 1
Usi
The LWL/LDL instructions mask the GPR with a mask depending on the
address alignement. It is currently computed by doing:
mask = 0x7fffull >> (t1 ^ 63)
It's simpler to generate it by doing:
mask = (1 << t1) - 1
It uses the same number of TCG instructions, but it avoids a 32/
