Test safe154

PPC safe154
"SyncdWW Rfe DpdR Fre LwSyncdWW Wse"
Cycle=SyncdWW Rfe DpdR Fre LwSyncdWW Wse
Relax=
Safe=Fre Wse LwSyncdWW DpdR BCSyncdWW
{
0:r2=x; 0:r5=y;
1:r2=y; 1:r4=z;
2:r2=z; 2:r4=x;
}
 P0            | P1           | P2           ;
 lwz r1,0(r2)  | li r1,1      | li r1,2      ;
 xor r3,r1,r1  | stw r1,0(r2) | stw r1,0(r2) ;
 lwzx r4,r3,r5 | lwsync       | sync         ;
               | li r3,1      | li r3,1      ;
               | stw r3,0(r4) | stw r3,0(r4) ;
Observed
    0:r1=1; 0:r4=0; z=2;