Test bb7

PPC bb7 (BBSeven)
"3 proc, st/st ld/ld, sync/lwsync barriers simplification of ppc/ccv3 test"
{
0:r5=x ;
1:r5=x ; 1:r6=y;
2:r5=x ; 2:r6=y;
}
P0           |P1          |P2           ;
li r1,1      |lwz r1,0(r5)|li r1,1      ;
stw r1,0(r5) |sync        |stw r1,0(r6) ;
             |lwz r2,0(r6)|lwsync       ;
             |            |li r2,2      ;
             |            |stw r2,0(r5) ;
Observed
    1:r1=1; 1:r2=0; x=1;