Test i1

PPC i1 (IOne)
"RW reordering w. B-cumul barrier"

{0:r5=x; 0:r6=y; 0:r1=0;
 1:r5=x; 1:r6=y;
 2:r6=y;
 x=0; y=0;}

P0           | P1           | P2           ;
lwz r1,0(r5) | li r3,2      | lwz r1,0(r6) ;
             | stw r3,0(r6) | lwz r2,0(r6) ;
li r2,1      | sync         |              ;
stw r2,0(r6) | li r4,1      |              ;
             | stw r4,0(r5) |              ;

Observed
    0:r1=1; 2:r1=0; 2:r2=0; y=2;
and 0:r1=1; 2:r1=0; 2:r2=1; y=2;
and 0:r1=1; 2:r1=1; 2:r2=1; y=2;
and 0:r1=1; 2:r1=0; 2:r2=2; y=2;
and 0:r1=1; 2:r1=1; 2:r2=2; y=2;
and 0:r1=1; 2:r1=2; 2:r2=2; y=2;