Test gg3

PPC gg3 (BasicGGThree)
{
x=0 ; y=0;
0:r4=x ; 0:r5=y;
1:r4=x ; 1:r5=y; 2:r5=y;
0:r1=1 ; 1:r2=2 ;2:r3=3;
}

P0           |     P1       |   P2        ;
stw r1,0(r4) | stw r2,0(r5) |stw r3,0(r5) ;
lwsync       | sync         |             ;
stw r1,0(r5) | lwz r3,0(r4) |             ;

Observed
    1:r3=0; y=2;