Test safe321

PPC safe321
"SyncdWW Rfe DpdR Fre SyncdWW Rfe DpdR Fre"
Cycle=SyncdWW Rfe DpdR Fre SyncdWW Rfe DpdR Fre
Relax=
Safe=Fre DpdR BCSyncdWW
{
0:r2=x; 0:r5=y;
1:r2=y; 1:r4=z;
2:r2=z; 2:r5=a;
3:r2=a; 3:r4=x;
}
 P0            | P1           | P2            | P3           ;
 lwz r1,0(r2)  | li r1,1      | lwz r1,0(r2)  | li r1,1      ;
 xor r3,r1,r1  | stw r1,0(r2) | xor r3,r1,r1  | stw r1,0(r2) ;
 lwzx r4,r3,r5 | sync         | lwzx r4,r3,r5 | sync         ;
               | li r3,1      |               | li r3,1      ;
               | stw r3,0(r4) |               | stw r3,0(r4) ;
exists
(0:r1=1 /\ 0:r4=0 /\ 2:r1=1 /\ 2:r4=0)