PPC safe036 "SyncdWW Wse SyncdWW Wse" Cycle=SyncdWW Wse SyncdWW Wse Relax= Safe=Wse SyncdWW { 0:r2=x; 0:r4=y; 1:r2=y; 1:r4=x; } P0 | P1 ; li r1,2 | li r1,2 ; stw r1,0(r2) | stw r1,0(r2) ; sync | sync ; li r3,1 | li r3,1 ; stw r3,0(r4) | stw r3,0(r4) ; exists (x=2 /\ y=2)