Test safe331

PPC safe331
"Rfe SyncsRR Fre SyncdWW Rfe DpdR Fre"
Cycle=Rfe SyncsRR Fre SyncdWW Rfe DpdR Fre
Relax=
Safe=Fre DpdR ACSyncsRR BCSyncdWW
{
0:r2=y;
1:r2=y; 1:r4=x;
2:r2=x; 2:r5=y;
3:r2=y;
}
 P0           | P1           | P2            | P3           ;
 lwz r1,0(r2) | li r1,2      | lwz r1,0(r2)  | li r1,1      ;
 sync         | stw r1,0(r2) | xor r3,r1,r1  | stw r1,0(r2) ;
 lwz r3,0(r2) | sync         | lwzx r4,r3,r5 |              ;
              | li r3,1      |               |              ;
              | stw r3,0(r4) |               |              ;
exists
(y=2 /\ 0:r1=1 /\ 0:r3=1 /\ 2:r1=1 /\ 2:r4=0)