PPC W+RW+R+WR+lwsync+sync "Rfe LwSyncdRW Rfe Fre SyncdWR Fre" Prefetch=0:x=T,1:x=F,1:y=W,3:y=F,3:x=T Com=Rf Rf Fr Fr Orig=Rfe LwSyncdRW Rfe Fre SyncdWR Fre { 0:r2=x; 1:r2=x; 1:r4=y; 2:r2=y; 3:r2=y; 3:r4=x; } P0 | P1 | P2 | P3 ; li r1,1 | lwz r1,0(r2) | lwz r1,0(r2) | li r1,2 ; stw r1,0(r2) | lwsync | | stw r1,0(r2) ; | li r3,1 | | sync ; | stw r3,0(r4) | | lwz r3,0(r4) ; Observed 1:r1=1; 2:r1=0; 3:r3=0; y=2; and 1:r1=1; 2:r1=1; 3:r3=0; y=2; and 1:r1=1; 2:r1=2; 3:r3=0; y=2;