Test safe298

PPC safe298
"Rfe SyncdRW Rfe SyncdRR Fre SyncsWW Rfe DpdW Wsi"
Cycle=Rfe SyncdRW Rfe SyncdRR Fre SyncsWW Rfe DpdW Wsi
Relax=
Safe=Fre Wsi DpdW ACSyncdRW ACSyncdRR BCSyncsWW
{
0:r2=z; 0:r4=x;
1:r2=x; 1:r4=y;
2:r2=y;
3:r2=y; 3:r5=z;
}
 P0           | P1           | P2           | P3            ;
 lwz r1,0(r2) | lwz r1,0(r2) | li r1,1      | lwz r1,0(r2)  ;
 sync         | sync         | stw r1,0(r2) | xor r3,r1,r1  ;
 li r3,1      | lwz r3,0(r4) | sync         | li r4,1       ;
 stw r3,0(r4) |              | li r3,2      | stwx r4,r3,r5 ;
              |              | stw r3,0(r2) | li r6,2       ;
              |              |              | stw r6,0(r5)  ;
exists
(y=2 /\ z=2 /\ 0:r1=2 /\ 1:r1=1 /\ 1:r3=0 /\ 3:r1=2)