Re: [avr-gcc-list] gcc binary

[Yura Galayda]

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      Why not use macros, for example:

#define BIN8(x) BIN___(0##x)

#define BIN___(x)                                        \
       (                                                \
       ((x / 01ul) % 010)*(2>>1) +                      \
       ((x / 010ul) % 010)*(2<<0) +                     \
       ((x / 0100ul) % 010)*(2<<1) +                    \
       ((x / 01000ul) % 010)*(2<<2) +                   \
       ((x / 010000ul) % 010)*(2<<3) +                  \
       ((x / 0100000ul) % 010)*(2<<4) +                 \
       ((x / 01000000ul) % 010)*(2<<5) +                \
       ((x / 010000000ul) % 010)*(2<<6)                 \
       )

#define BIN16(x1,x2) \
           ((BIN(x1)<<8)+BIN(x2))

#define BIN24(x1,x2,x3) \
           ((BIN(x1)<<16)+(BIN(x2)<<8)+BIN(x3))

#define BIN32(x1,x2,x3,x4) \
           ((BIN(x1)<<24)+(BIN(x2)<<16)+(BIN(x3)<<8)+BIN(x4))


char  i1 = BIN8  (00101010);
short i2 = BIN16(10110110,11101110);
long  i3 = BIN24(10110111,00010111,01000110);
long  i4 = BIN32(11101101,01101000,01010010,10111100);      


Erik Christiansen wrote:

> On Wed, Mar 03, 2004 at 08:20:57PM +0100, Joerg Wunsch wrote:
>  
>
> > It seems to be quite common among µC C compilers.  Unlike the PORTB.0
> > notation where I don't see how this would ever fit at all into legal C
> > syntax, I can imagine that 0b is a perferctly legal vendor extension
> > for a compiler.
> >    
>
> It's also perfectly legal for avr-as (OK, that's binutils, but gcc is
> nothing without it):
>
> ldi    r16,0b10111111
>
> Overcoming the compiler deficiency seems attractive. Portability is a
> bit of a worry, though. I wonder if the 'C' world could be educated, in
> time?
>
>  
>
> > Just curious, I've once made a patch for GCC that implements it.  This
> > was merely intented to be a proof of concept.  Does anyone
> > incidentally know whether this feature might have already been
> > proposed (and perhaps put down) to the GCC folks?  If not, do people
> > feel I should submit that patch?
> >    
>
>  
>
> > In case anyone is interested:
> >
> > http://www.sax.de/~joerg/gcc-0b.patch
> >
> >    
>
> Interested enough to take a copy for future reference. (When this
> first project is delivered, I'll take a look at the compiler. :)
>
> Thanks Jörg.
>
> Erik
>
> _______________________________________________
> avr-gcc-list mailing list
> address@hidden
> http://www.avr1.org/mailman/listinfo/avr-gcc-list
>
>  


--
------------
Yuri Galayda at EIC Vector R&D Department       address@hidden
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