Test safe241

PPC safe241
"SyncdWW Rfe SyncsRW Rfe DpdW Rfe SyncdRW Wse"
Cycle=SyncdWW Rfe SyncsRW Rfe DpdW Rfe SyncdRW Wse
Relax=
Safe=Wse DpdW ACSyncdRW BCSyncsRW BCSyncdWW
{
0:r2=x;
1:r2=x; 1:r5=y;
2:r2=y; 2:r4=z;
3:r2=z; 3:r4=x;
}
 P0           | P1            | P2           | P3           ;
 lwz r1,0(r2) | lwz r1,0(r2)  | lwz r1,0(r2) | li r1,2      ;
 sync         | xor r3,r1,r1  | sync         | stw r1,0(r2) ;
 li r3,2      | li r4,1       | li r3,1      | sync         ;
 stw r3,0(r2) | stwx r4,r3,r5 | stw r3,0(r4) | li r3,1      ;
              |               |              | stw r3,0(r4) ;
exists
(x=2 /\ z=2 /\ 0:r1=1 /\ 1:r1=2 /\ 2:r1=1)