Test SyncWith3NoLoop

PPC SyncWith3NoLoop
"Synchornize with 3 procs NoLoop"
{
0:r2=x; 0:r4=y; 0:r5=z ;
1:r5=z; 1:r6=t;
2:r2=y; 2:r4=x; 2:r5=t ;
}
 P0           |P1           | P2           ;
 li r1,1      |             |              ;
 stw r1,0(r2) |lwz r1,0(r5) | lwz r6,0(r5) ;
 stw r1,0(r4) |stw r1,0(r6) | cmpw r6,r6   ;
 lwsync       |             | bne L2       ;
              |             |L2:           ;
 stw r1,0(r5) |             | isync        ;
              |             | lwz r1,0(r2) ;
              |             | lwz r3,0(r4) ;
exists (2:r6=1 /\ 2:r1=1 /\ 2:r3=0)