PPC safe538 "LwSyncdWW Rfe SyncsRW Rfe SyncdRR Fre" Cycle=LwSyncdWW Rfe SyncsRW Rfe SyncdRR Fre Relax= Safe=Fre LwSyncdWW ACSyncsRW ACSyncdRR { 0:r2=x; 1:r2=x; 1:r4=y; 2:r2=y; 2:r4=x; } P0 | P1 | P2 ; lwz r1,0(r2) | lwz r1,0(r2) | li r1,1 ; sync | sync | stw r1,0(r2) ; li r3,2 | lwz r3,0(r4) | lwsync ; stw r3,0(r2) | | li r3,1 ; | | stw r3,0(r4) ; Observed 0:r1=0; 1:r1=2; 1:r3=0; x=2;