Test safe493

PPC safe493
"SyncdWW Rfe DpdR Fri Rfe SyncdRW Rfe SyncsRR Fre"
Cycle=SyncdWW Rfe DpdR Fri Rfe SyncdRW Rfe SyncsRR Fre
Relax=
Safe=Fri Fre DpdR ACSyncsRR ACSyncdRW BCSyncdWW
{
0:r2=x; 0:r5=y;
1:r2=y; 1:r4=z;
2:r2=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      ;
 xor r3,r1,r1  | sync         | sync         | stw r1,0(r2) ;
 lwzx r4,r3,r5 | li r3,1      | lwz r3,0(r2) | sync         ;
 li r6,1       | stw r3,0(r4) |              | li r3,1      ;
 stw r6,0(r5)  |              |              | stw r3,0(r4) ;
exists
(z=2 /\ 0:r1=1 /\ 0:r4=0 /\ 1:r1=1 /\ 2:r1=1 /\ 2:r3=1)