| 49,20 → 49,15 |
|---|
| static inline long atomic_add(atomic_t *val, int i) |
| { |
| uint64_t a, b; |
| volatile uint64_t x = (uint64_t) &val->count; |
| |
| __asm__ volatile ( |
| "0:\n" |
| "ldx %0, %1\n" |
| "add %1, %3, %2\n" |
| "casx %0, %1, %2\n" |
| "cmp %1, %2\n" |
| "bne 0b\n" /* The operation failed and must be attempted again if a != b. */ |
| "nop\n" |
| : "=m" (*((uint64_t *)x)), "=r" (a), "=r" (b) |
| : "r" (i) |
| ); |
| do { |
| volatile uintptr_t x = (uint64_t) &val->count; |
| |
| a = *((uint64_t *) x); |
| b = a + i; |
| __asm__ volatile ("casx %0, %1, %2\n": "+m" (*((uint64_t *)x)), "+r" (a), "+r" (b)); |
| } while (a != b); |
| |
| return a; |
| } |
| |