atomic_arch.h 311 B

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  1. #define a_cas a_cas
  2. static inline int a_cas(volatile int *p, int t, int s)
  3. {
  4. __asm__("\n"
  5. " sync\n"
  6. "1: lwarx %0, 0, %4\n"
  7. " cmpw %0, %2\n"
  8. " bne 1f\n"
  9. " stwcx. %3, 0, %4\n"
  10. " bne- 1b\n"
  11. " isync\n"
  12. "1: \n"
  13. : "=&r"(t), "+m"(*p) : "r"(t), "r"(s), "r"(p) : "cc", "memory" );
  14. return t;
  15. }