Test m1l

PPC m1l  (PPCMOneLwSync)
"plain iriw, light barriers"
{
P0:r4=x ; P0:r5=y ;
P1:r4=x ; P1:r5=y ;
P2:r4=x ; P3:r5=y ;
P2:r1=1 ; P3:r2=2 ;
}

P0           |P1           |P2           |P3           ;
lwz r1,0(r4) |lwz r2,0(r5) |stw r1,0(r4) |stw r2,0(r5) ;
lwsync       |lwsync       |             |             ;
lwz r2,0(r5) |lwz r1,0(r4) |             |             ;
exists(0:r1=1 /\ 0:r2=0 /\ 1:r1=0 /\ 1:r2=2)