Test safe360

PPC safe360
"SyncsWR Fre SyncdWR Fre SyncdWR Fre"
Cycle=SyncsWR Fre SyncdWR Fre SyncdWR Fre
Relax=
Safe=Fre SyncsWR SyncdWR
{
0:r2=y; 0:r4=x;
1:r2=x; 1:r4=y;
2:r2=y;
}
 P0           | P1           | P2           ;
 li r1,2      | li r1,1      | li r1,1      ;
 stw r1,0(r2) | stw r1,0(r2) | stw r1,0(r2) ;
 sync         | sync         | sync         ;
 lwz r3,0(r4) | lwz r3,0(r4) | lwz r3,0(r2) ;
exists
(y=2 /\ 0:r3=0 /\ 1:r3=0 /\ 2:r3=1)