PPC l3 (BasicLThree) { 0:r4=x; 0:r5=y; 1:r4=x; 1:r5=y; 2:r5=y; 0:r1=1; 1:r2=2; 1:r1=1; 2:r1=1; } P0 |P1 |P2 ; lwz r2,0(r5)|stw r2,0(r4)|stw r1,0(r5); lwsync |sync | ; stw r1,0(r4)|lwz r1,0(r5)| ; Observed 0:r2=1; 1:r1=0; x=2;