AO_INLINE AO_TS_VAL_t
AO_test_and_set_full(volatile AO_TS_t *addr) {
- int oldval;
+ AO_TS_VAL_t oldval;
__asm__ __volatile__("ldstub %1,%0"
: "=r"(oldval), "=m"(*addr)
#define AO_HAVE_test_and_set_full
+#ifndef AO_NO_SPARC_V9
+/* Returns nonzero if the comparison succeeded. */
+AO_INLINE int
+AO_compare_and_swap_full(volatile AO_t *addr, AO_t old, AO_t new_val) {
+ char ret;
+ __asm__ __volatile__ ("membar #StoreLoad | #LoadLoad\n\t"
+# if defined(__arch64__)
+ "casx [%2],%0,%1\n\t"
+# else
+ "cas [%2],%0,%1\n\t" /* 32-bit version */
+# endif
+ "membar #StoreLoad | #StoreStore\n\t"
+ "cmp %0,%1\n\t"
+ "be,a 0f\n\t"
+ "mov 1,%0\n\t"/* one insn after branch always executed */
+ "clr %0\n\t"
+ "0:\n\t"
+ : "=r" (ret), "+r" (new_val)
+ : "r" (addr), "0" (old)
+ : "memory", "cc");
+ return (int)ret;
+}
+
+#define AO_HAVE_compare_and_swap_full
+#endif /* AO_NO_SPARC_V9 */
+
/* FIXME: This needs to be extended for SPARC v8 and v9. */
/* SPARC V8 also has swap. V9 has CAS. */
/* There are barriers like membar #LoadStore. */