asm volatile ("test0 X%0Y%[arg]Z" : [arg] "=g" (x));
asm volatile ("test1 X%[out]Y%[in]Z" : [out] "=g" (y) : [in] "0"(y));
asm volatile ("test2 X%a0Y%a[arg]Z" : : [arg] "p" (&z));
+ asm volatile ("test3 %[in]" : [inout] "=g"(x) : "[inout]" (x), [in] "g" (y));
}
/* ??? Someone explain why the back reference dosn't work. */