Il 22/08/2013 10:20, Alexey Kardashevskiy ha scritto: > This adds macro to extend signed 64bit value to signed 128bit value. > > Signed-off-by: Alexey Kardashevskiy <a...@ozlabs.ru> > --- > include/qemu/int128.h | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/include/qemu/int128.h b/include/qemu/int128.h > index 9ed47aa..987a1a9 100644 > --- a/include/qemu/int128.h > +++ b/include/qemu/int128.h > @@ -38,6 +38,11 @@ static inline Int128 int128_2_64(void) > return (Int128) { 0, 1 }; > } > > +static inline Int128 int128_exts64(int64_t a) > +{ > + return (Int128) { .lo = a, .hi = (a >> 63) ? -1 : 0 }; > +}
The "? -1 : 0" is not necessary, but the compiler will remove it at -O1 or more (interestingly, or -O0 it will remove the shift and leave the conditional!). > static inline Int128 int128_and(Int128 a, Int128 b) > { > return (Int128) { a.lo & b.lo, a.hi & b.hi }; > Acked-by: Paolo Bonzini <pbonz...@redhat.com> Paolo