Hi Georg,
I haven't tested this, but to embed the assembly language you need
something like the following. If you look in the mspgcc documentation
you will find some information about this. If you look in the GNU GCC
documentation you will find some more. However, this area is not as well
documented as it might be, with clear examples, etc. Figuring out
exactly how to use those dependency fields is not easy.
Regards,
Steve
unsigned char reverse(unsigned char b)
{
unsigned char tmp = 0;
for( i=0; i<8; i++ )
{
__asm__ (
" rrc.b %[b] \n"
" rrl.b %[tmp] \n"
: [tmp] "+r"(tmp)
: [b] "r"(b));
}
return tmp;
}
Georg Ritter wrote:
Good morning!
I'm looking for a proper implementation of a bitwisereverse function
of a byte (1010 0001 becomes: 1000 0101). I want to replace an ugly
and clumpsy function I used in testing.
I would like to write smth like:
unsigned char reverse(unsigned char b)
{
unsigned char tmp=0;
for( i=0; i<8; i++ )
{
// RRC.B of b
// RRL.B into tmp
}
return tmp;
}
There's no real "C" way of doing it, isn't it? So what could the
inline asmbly line for that look like. I never used it before, and
it's tricky and documents didn't enlighten my too much. So my versions
either didn't compile or didn't work.
Or is there a smaller (in terms of code size) way of doing the
reversion (hacker contest ;-) )?
Greetz,
Georg
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