arc_st_r
len += arc_st_r(BUF(buf, len), REG_LO(rs), arc_reg_mem,
len += arc_st_r(BUF(buf, len), REG_HI(rs), arc_reg_mem,
len += arc_st_r(BUF(buf, len), REG_LO(rs), arc_reg_mem,
len += arc_st_r(BUF(buf, len), arc_rs, arc_reg_mem,
len += arc_st_r(BUF(buf, len), arc_rs, arc_reg_mem,
len += arc_st_r(BUF(buf, len), arc_rs, arc_reg_mem, off, zz);