PPC MP+sync+ctrl "SyncdWW Rfe DpCtrldR Fre" Cycle=Rfe DpCtrldR Fre SyncdWW { 0:r2=x; 0:r4=y; 1:r2=y; 1:r4=x; } P0 | P1 ; li r1,1 | lwz r1,0(r2) ; stw r1,0(r2) | cmpw r1,r1 ; sync | beq LC00 ; li r3,1 | LC00: ; stw r3,0(r4) | lwz r3,0(r4) ; exists (1:r1=1 /\ 1:r3=0)