C ISA2+poonceonces

{}

P0(int *x, int *y)
{
	WRITE_ONCE(*x, 1);
	WRITE_ONCE(*y, 1);
}

P1(int *y, int *z)
{
	int r0;

	r0 = READ_ONCE(*y);
	WRITE_ONCE(*z, 1);
}

P2(int *x, int *z)
{
	int r0;
	int r1;

	r0 = READ_ONCE(*z);
	r1 = READ_ONCE(*x);
}

exists (1:r0=1 /\ 2:r0=1 /\ 2:r1=0)