C IRWIW+poacquireonces+OnceRelease Hash=8706f396b8a1cb39a45cfddafcb386c5 Cycle=PodRWAcquireOnce WseOnceOnce RfeOnceAcquire PodRWAcquireOnce WseOnceRelease RfeReleaseAcquire Relax=RfeOnceAcquire WseOnceRelease RfeReleaseAcquire Safe=PodRWAcquireOnce WseOnceOnce Generator=diy7 (version 7.46+3) Prefetch=1:x=F,1:y=W,3:y=F,3:x=W Com=Rf Ws Rf Ws Orig=RfeOnceAcquire PodRWAcquireOnce WseOnceRelease RfeReleaseAcquire PodRWAcquireOnce WseOnceOnce {} P0(int* x) { WRITE_ONCE(*x,2); } P1(int* x,int* y) { int r0 = smp_load_acquire(x); WRITE_ONCE(*y,1); } P2(int* y) { smp_store_release(y,2); } P3(int* x,int* y) { int r0 = smp_load_acquire(y); WRITE_ONCE(*x,1); } Observed y=2; x=2; 3:r0=1; 1:r0=1; and y=1; x=2; 3:r0=1; 1:r0=1; and y=2; x=1; 3:r0=1; 1:r0=1; and y=1; x=1; 3:r0=1; 1:r0=1;
C11 equivalent:
C IRWIW+poacquireonces+OnceRelease Hash=8706f396b8a1cb39a45cfddafcb386c5 Cycle=PodRWAcquireOnce WseOnceOnce RfeOnceAcquire PodRWAcquireOnce WseOnceRelease RfeReleaseAcquire Relax=RfeOnceAcquire WseOnceRelease RfeReleaseAcquire Safe=PodRWAcquireOnce WseOnceOnce Generator=diy7 (version 7.46+3) Prefetch=1:x=F,1:y=W,3:y=F,3:x=W Com=Rf Ws Rf Ws Orig=RfeOnceAcquire PodRWAcquireOnce WseOnceRelease RfeReleaseAcquire PodRWAcquireOnce WseOnceOnce {} P0(atomic_int* x) { atomic_store_explicit(x,2,memory_order_relaxed); } P1(atomic_int* x,atomic_int* y) { int r0 = atomic_load_explicit(x,memory_order_acquire); atomic_store_explicit(y,1,memory_order_relaxed); } P2(atomic_int* y) { atomic_store_explicit(y,2,memory_order_release); } P3(atomic_int* x,atomic_int* y) { int r0 = atomic_load_explicit(y,memory_order_acquire); atomic_store_explicit(x,1,memory_order_relaxed); } exists (x=2 /\ y=2 /\ 1:r0=2 /\ 3:r0=2)