Test safe297

PPC safe297
"Rfe SyncdRR Fre SyncsWW Rfe DpdW Wsi"
Cycle=Rfe SyncdRR Fre SyncsWW Rfe DpdW Wsi
Relax=
Safe=Fre Wsi DpdW ACSyncdRR BCSyncsWW
{
0:r2=y; 0:r4=x;
1:r2=x;
2:r2=x; 2:r5=y;
}
 P0           | P1           | P2            ;
 lwz r1,0(r2) | li r1,1      | lwz r1,0(r2)  ;
 sync         | stw r1,0(r2) | xor r3,r1,r1  ;
 lwz r3,0(r4) | sync         | li r4,1       ;
              | li r3,2      | stwx r4,r3,r5 ;
              | stw r3,0(r2) | li r6,2       ;
              |              | stw r6,0(r5)  ;
Observed
    0:r1=1; 0:r3=0; 2:r1=1; x=2; y=2;
and 0:r1=2; 0:r3=0; 2:r1=1; x=2; y=2;
and 0:r1=1; 0:r3=1; 2:r1=2; x=2; y=2;