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C MP+pooncerelease+poacquireonce {} P0(int *x, int *y) { WRITE_ONCE(*x, 1); smp_store_release(y, 1); } P1(int *x, int *y) { int r0; int r1; r0 = smp_load_acquire(y); r1 = READ_ONCE(*x); } exists (1:r0=1 /\ 1:r1=0)