162306a36Sopenharmony_ciC CoRR+poonceonce+Once 262306a36Sopenharmony_ci 362306a36Sopenharmony_ci(* 462306a36Sopenharmony_ci * Result: Never 562306a36Sopenharmony_ci * 662306a36Sopenharmony_ci * Test of read-read coherence, that is, whether or not two successive 762306a36Sopenharmony_ci * reads from the same variable are ordered. 862306a36Sopenharmony_ci *) 962306a36Sopenharmony_ci 1062306a36Sopenharmony_ci{} 1162306a36Sopenharmony_ci 1262306a36Sopenharmony_ciP0(int *x) 1362306a36Sopenharmony_ci{ 1462306a36Sopenharmony_ci WRITE_ONCE(*x, 1); 1562306a36Sopenharmony_ci} 1662306a36Sopenharmony_ci 1762306a36Sopenharmony_ciP1(int *x) 1862306a36Sopenharmony_ci{ 1962306a36Sopenharmony_ci int r0; 2062306a36Sopenharmony_ci int r1; 2162306a36Sopenharmony_ci 2262306a36Sopenharmony_ci r0 = READ_ONCE(*x); 2362306a36Sopenharmony_ci r1 = READ_ONCE(*x); 2462306a36Sopenharmony_ci} 2562306a36Sopenharmony_ci 2662306a36Sopenharmony_ciexists (1:r0=1 /\ 1:r1=0) 27