Test safe514

PPC safe514
"SyncsWW Rfe DpdW Rfe SyncdRR Fre"
Cycle=SyncsWW Rfe DpdW Rfe SyncdRR Fre
Relax=
Safe=Fre DpdW ACSyncdRR BCSyncsWW
{
0:r2=y; 0:r5=x;
1:r2=x; 1:r4=y;
2:r2=y;
}
 P0            | P1           | P2           ;
 lwz r1,0(r2)  | lwz r1,0(r2) | li r1,1      ;
 xor r3,r1,r1  | sync         | stw r1,0(r2) ;
 li r4,1       | lwz r3,0(r4) | sync         ;
 stwx r4,r3,r5 |              | li r3,2      ;
               |              | stw r3,0(r2) ;
Observed
    0:r1=1; 1:r1=1; 1:r3=0; y=2;