the "A" constraint is simply for an address expression that's a single
register, but it's not yet supported by clang, and has no advantage
here over just using a register operand for the address. the latter is
actually preferable in the a_cas_p case because it avoids aliasing an
lvalue onto the memory.
{
int old, tmp;
__asm__ __volatile__ (
{
int old, tmp;
__asm__ __volatile__ (
- "\n1: lr.w.aqrl %0, %2\n"
+ "\n1: lr.w.aqrl %0, (%2)\n"
- " sc.w.aqrl %1, %4, %2\n"
+ " sc.w.aqrl %1, %4, (%2)\n"
- : "=&r"(old), "=r"(tmp), "+A"(*p)
- : "r"(t), "r"(s)
+ : "=&r"(old), "=r"(tmp)
+ : "r"(p), "r"(t), "r"(s)
: "memory");
return old;
}
: "memory");
return old;
}
void *old;
int tmp;
__asm__ __volatile__ (
void *old;
int tmp;
__asm__ __volatile__ (
- "\n1: lr.d.aqrl %0, %2\n"
+ "\n1: lr.d.aqrl %0, (%2)\n"
- " sc.d.aqrl %1, %4, %2\n"
+ " sc.d.aqrl %1, %4, (%2)\n"
- : "=&r"(old), "=r"(tmp), "+A"(*(long *)p)
- : "r"(t), "r"(s)
+ : "=&r"(old), "=r"(tmp)
+ : "r"(p), "r"(t), "r"(s)
: "memory");
return old;
}
: "memory");
return old;
}