ARC_R_1
len += arc_mov_r(BUF(buf, len), ARC_R_1, REG_HI(BPF_REG_0));
len += arc_mov_r(BUF(buf, len), REG_HI(BPF_REG_0), ARC_R_1);
[BPF_REG_1] = {ARC_R_0, ARC_R_1},