Archipelago » qemu

            if (I16 == 0) {

                tcg_gen_mov_tl(cpu_R[rd], cpu_R[ra]);

            } else {

                int lab = gen_new_label();

                TCGv_i64 ta = tcg_temp_new_i64();

                TCGv_i64 td = tcg_temp_local_new_i64();

                TCGv_i32 res = tcg_temp_local_new_i32();

                TCGv_i32 sr_ove = tcg_temp_local_new_i32();

                tcg_gen_extu_i32_i64(ta, cpu_R[ra]);

                tcg_gen_addi_i64(td, ta, sign_extend(I16, 16));

                tcg_gen_trunc_i64_i32(res, td);

                tcg_gen_shri_i64(td, td, 32);

                tcg_gen_andi_i64(td, td, 0x3);

                /* Jump to lab when no overflow.  */

                tcg_gen_brcondi_i64(TCG_COND_EQ, td, 0x0, lab);

                tcg_gen_brcondi_i64(TCG_COND_EQ, td, 0x3, lab);

                tcg_gen_ori_i32(cpu_sr, cpu_sr, (SR_OV | SR_CY));

                tcg_gen_andi_i32(sr_ove, cpu_sr, SR_OVE);

                tcg_gen_brcondi_i32(TCG_COND_NE, sr_ove, SR_OVE, lab);

                gen_exception(dc, EXCP_RANGE);

                gen_set_label(lab);

                tcg_gen_mov_i32(cpu_R[rd], res);

                tcg_temp_free_i64(ta);

                tcg_temp_free_i64(td);

                tcg_temp_free_i32(res);

                tcg_temp_free_i32(sr_ove);

            }