I'm trying to improve atomic operations for ColdFir ein a 2.4 kernel, and
I tried the following following the current online manual at:
http://gcc.gnu.org/onlinedocs/gcc-3.4.3/gcc/Extended-Asm.html#Extended-Asm
static __inline__ void atomic_inc(atomic_t *v)
{
__asm__ __volatile__("addql #1,%0" : "=m" (*v) : "0" (*v));
}
but that genreates *lots* of warning messages about "matching
contstaint doesn't allow a register". The manual states that if I
*don't* use "0", then the compiler may have the input and output
operand in seperate locations, and predicts unkown bad things can
happen.
Searching the archives I see that people are using:
static __inline__ void atomic_inc(atomic_t *v)
{
__asm__ __volatile__("addql #1,%0" : "=m" (*v) : "m" (*v));
}
which seems to work, but I'm really concerned about the manuals
warning of the input and output operads being in seperate places.
Which form is correct?
--
Peter Barada
[EMAIL PROTECTED]
