[Gambas-user] Bit manipulation functions

[Demosthenes Koptsis]

but why a shift to right of
? bin(-9, 64)
1111111111111111111111111111111111111111111111111111111111110111

is not
0111111111111111111111111111111111111111111111111111111111111011

and it is
? bin(lsr(-9,1), 64)
0000000000000000000000000000000001111111111111111111111111111011
                                 
???

because lsr processes 32 bits of the short -9 and not 64 bits of the
long binary number?

On Sat, 2010-11-20 at 17:58 +0200, Jussi Lahtinen wrote:
> Argh... no.
> Try this:
> ? bin(Lsr(-9,1),32)
> 01111111111111111111111111111011
> 
> Jussi
> 
> 
> On Sat, Nov 20, 2010 at 17:55, Jussi Lahtinen <jussi.lahtinen at ...626...>wrote:
> 
> >
> >   PRINT "Bin(-9)        :"; Bin(-9)
> >>  PRINT "Bin(Lsl(-9, 1)):"; Bin(Lsl(-9, 1))
> >>  PRINT "Bin(Lsr(-9, 1)):"; Bin(Lsr(-9, 1))
> >>
> >> Bin(-9)
> >> :1111111111111111111111111111111111111111111111111111111111110111
> >>
> >> Bin(Lsl(-9,1)):1111111111111111111111111111111111111111111111111111111111101110
> >> Bin(Lsr(-9,1)):1111111111111111111111111111011
> >>
> >> Lsl is correct, it adds a 0 at the right and shift binary to left
> >> Lsr i think is wrong
> >>
> >> -9 is
> >> 1111111111111111111111111111111111111111111111111111111111110111
> >>
> >> Lsr(-9,1) should be
> >> 0111111111111111111111111111111111111111111111111111111111111011
> >>
> >>
> > I think the sign bit shouldn't be shifted. So this is correct.
> >
> > Jussi
> >
> >
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-- 
Regards,
Demosthenes Koptsis.