C Z6.2+pooncereleases Hash=048f8d062840555cde2a927324c1e8f1 Cycle=PodWWOnceRelease RfeReleaseOnce PodRWOnceRelease RfeReleaseOnce PodRWOnceRelease WseReleaseOnce Relax=RfeReleaseOnce WseReleaseOnce Safe=PodWWOnceRelease PodRWOnceRelease Generator=diy7 (version 7.46+3) Prefetch=0:x=F,0:y=W,1:y=F,1:z=W,2:z=F,2:x=W Com=Rf Rf Ws Orig=PodWWOnceRelease RfeReleaseOnce PodRWOnceRelease RfeReleaseOnce PodRWOnceRelease WseReleaseOnce {} P0(int* x,int* y) { WRITE_ONCE(*x,2); smp_store_release(y,1); } P1(int* y,int* z) { int r0 = READ_ONCE(*y); smp_store_release(z,1); } P2(int* x,int* z) { int r0 = READ_ONCE(*z); smp_store_release(x,1); } Observed x=2; 2:r0=1; 1:r0=1;
C11 equivalent:
C Z6.2+pooncereleases Hash=048f8d062840555cde2a927324c1e8f1 Cycle=PodWWOnceRelease RfeReleaseOnce PodRWOnceRelease RfeReleaseOnce PodRWOnceRelease WseReleaseOnce Relax=RfeReleaseOnce WseReleaseOnce Safe=PodWWOnceRelease PodRWOnceRelease Generator=diy7 (version 7.46+3) Prefetch=0:x=F,0:y=W,1:y=F,1:z=W,2:z=F,2:x=W Com=Rf Rf Ws Orig=PodWWOnceRelease RfeReleaseOnce PodRWOnceRelease RfeReleaseOnce PodRWOnceRelease WseReleaseOnce {} P0(atomic_int* x,atomic_int* y) { atomic_store_explicit(x,2,memory_order_relaxed); atomic_store_explicit(y,1,memory_order_release); } P1(atomic_int* y,atomic_int* z) { int r0 = atomic_load_explicit(y,memory_order_relaxed); atomic_store_explicit(z,1,memory_order_release); } P2(atomic_int* x,atomic_int* z) { int r0 = atomic_load_explicit(z,memory_order_relaxed); atomic_store_explicit(x,1,memory_order_release); } exists (x=2 /\ 1:r0=1 /\ 2:r0=1)