Test ppo1

PPC ppo1 (PPCPPOOne)
"is RR to same location in ppo?"
{
0:r6=x; 0:r7=y; 0:r8=z;
1:r7=y; 1:r8=z;
}
P0            |P1           ;
lwz r1,0(r7)  |li r1,1      ;
xor r9,r1,r1  |stw r1,0(r8) ;
lwzx r3,r9,r6 |sync         ;
lwz r4,0(r6)  |li r2,2      ;
xor r10,r4,r4 |stw r2,0(r7) ;
lwzx r2,r10,r8|             ;

locations [0:r1; 0:r2;]
exists (0:r1=2 /\ 0:r2=0)