SHF_SC_R_DSHF
SHF_OP_NONE, reg_b(dst), SHF_SC_R_DSHF,
reg_b(dst), SHF_SC_R_DSHF);
reg_b(dst), SHF_SC_R_DSHF, shift_amt);
reg_b(dst), SHF_SC_R_DSHF);
reg_b(dst), SHF_SC_R_DSHF, shift_amt);