下面的代码译码出指令的立即数，不同的指令有不同的立即数编码形式。
//I类型指令的imm，[31:20]，符号位扩展成32位。 wire [31:0] rv32_i_imm = { {20{rv32_instr[31]}} , rv32_instr[31:20] }; //S类型指令的立即数 wire [31:0] rv32_s_imm = { {20{rv32_instr[31]}} , rv32_instr[31:25] , rv32_instr[11:7] }; //B类型指令的立即数 wire [31:0] rv32_b_imm = { {19{rv32_instr[31]}} , rv32_instr[31] , rv32_instr[7] , rv32_instr[30:25] , rv32_instr[11:8] , 1'b0 }; //U类型指令立即数 wire [31:0] rv32_u_imm = {rv32_instr[31:12],12'b0}; //J类型指令立即数 wire [31:0] rv32_j_imm = { {11{rv32_instr[31]}} , rv32_instr[31] , rv32_instr[19:12] , rv32_instr[20] , rv32_instr[30:21] , 1'b0 }; // It will select i-type immediate when // * rv32_op_imm // * rv32_jalr // * rv32_load wire rv32_imm_sel_i = rv32_op_imm | rv32_jalr | rv32_load; wire rv32_imm_sel_jalr = rv32_jalr; wire [31:0] rv32_jalr_imm = rv32_i_imm; // It will select u-type immediate when // * rv32_lui, rv32_auipc wire rv32_imm_sel_u = rv32_lui | rv32_auipc; // It will select j-type immediate when // * rv32_jal wire rv32_imm_sel_j = rv32_jal; wire rv32_imm_sel_jal = rv32_jal; wire [31:0] rv32_jal_imm = rv32_j_imm; // It will select b-type immediate when // * rv32_branch wire rv32_imm_sel_b = rv32_branch; wire rv32_imm_sel_bxx = rv32_branch; wire [31:0] rv32_bxx_imm = rv32_b_imm; // It will select s-type immediate when // * rv32_store wire rv32_imm_sel_s = rv32_store;
以下是16位指令的立即数译码，16位指令立即数比较复杂。
// * Note: this CIS/CILI/CILUI/CI16SP-type is named by myself, because in // ISA doc, the CI format for LWSP is different // with other CI formats in terms of immediate // It will select CIS-type immediate when // * rv16_lwsp wire rv16_imm_sel_cis = rv16_lwsp; wire [31:0] rv16_cis_imm ={ 24'b0 , rv16_instr[3:2] , rv16_instr[12] , rv16_instr[6:4] , 2'b0 }; wire [31:0] rv16_cis_d_imm ={ 23'b0 , rv16_instr[4:2] , rv16_instr[12] , rv16_instr[6:5] , 3'b0 }; // It will select CILI-type immediate when // * rv16_li // * rv16_addi // * rv16_slli // * rv16_srai // * rv16_srli // * rv16_andi wire rv16_imm_sel_cili = rv16_li | rv16_addi | rv16_slli | rv16_srai | rv16_srli | rv16_andi; wire [31:0] rv16_cili_imm ={ {26{rv16_instr[12]}} , rv16_instr[12] , rv16_instr[6:2] }; // It will select CILUI-type immediate when // * rv16_lui wire rv16_imm_sel_cilui = rv16_lui; wire [31:0] rv16_cilui_imm ={ {14{rv16_instr[12]}} , rv16_instr[12] , rv16_instr[6:2] , 12'b0 }; // It will select CI16SP-type immediate when // * rv16_addi16sp wire rv16_imm_sel_ci16sp = rv16_addi16sp; wire [31:0] rv16_ci16sp_imm ={ {22{rv16_instr[12]}} , rv16_instr[12] , rv16_instr[4] , rv16_instr[3] , rv16_instr[5] , rv16_instr[2] , rv16_instr[6] , 4'b0 }; // It will select CSS-type immediate when // * rv16_swsp wire rv16_imm_sel_css = rv16_swsp; wire [31:0] rv16_css_imm ={ 24'b0 , rv16_instr[8:7] , rv16_instr[12:9] , 2'b0 }; wire [31:0] rv16_css_d_imm ={ 23'b0 , rv16_instr[9:7] , rv16_instr[12:10] , 3'b0 }; // It will select CIW-type immediate when // * rv16_addi4spn wire rv16_imm_sel_ciw = rv16_addi4spn; wire [31:0] rv16_ciw_imm ={ 22'b0 , rv16_instr[10:7] , rv16_instr[12] , rv16_instr[11] , rv16_instr[5] , rv16_instr[6] , 2'b0 }; // It will select CL-type immediate when // * rv16_lw wire rv16_imm_sel_cl = rv16_lw; wire [31:0] rv16_cl_imm ={ 25'b0 , rv16_instr[5] , rv16_instr[12] , rv16_instr[11] , rv16_instr[10] , rv16_instr[6] , 2'b0 }; wire [31:0] rv16_cl_d_imm ={ 24'b0 , rv16_instr[6] , rv16_instr[5] , rv16_instr[12] , rv16_instr[11] , rv16_instr[10] , 3'b0 }; // It will select CS-type immediate when // * rv16_sw wire rv16_imm_sel_cs = rv16_sw; wire [31:0] rv16_cs_imm ={ 25'b0 , rv16_instr[5] , rv16_instr[12] , rv16_instr[11] , rv16_instr[10] , rv16_instr[6] , 2'b0 }; wire [31:0] rv16_cs_d_imm ={ 24'b0 , rv16_instr[6] , rv16_instr[5] , rv16_instr[12] , rv16_instr[11] , rv16_instr[10] , 3'b0 }; // It will select CB-type immediate when // * rv16_beqz // * rv16_bnez wire rv16_imm_sel_cb = rv16_beqz | rv16_bnez; wire [31:0] rv16_cb_imm ={ {23{rv16_instr[12]}} , rv16_instr[12] , rv16_instr[6:5] , rv16_instr[2] , rv16_instr[11:10] , rv16_instr[4:3] , 1'b0 }; wire [31:0] rv16_bxx_imm = rv16_cb_imm; // It will select CJ-type immediate when // * rv16_j // * rv16_jal wire rv16_imm_sel_cj = rv16_j | rv16_jal; wire [31:0] rv16_cj_imm ={ {20{rv16_instr[12]}} , rv16_instr[12] , rv16_instr[8] , rv16_instr[10:9] , rv16_instr[6] , rv16_instr[7] , rv16_instr[2] , rv16_instr[11] , rv16_instr[5:3] , 1'b0 }; wire [31:0] rv16_jjal_imm = rv16_cj_imm; // It will select CR-type register (no-imm) when // * rv16_jalr_mv_add wire [31:0] rv16_jrjalr_imm = 32'b0; // It will select CSR-type register (no-imm) when // * rv16_subxororand
//wire [31:0] rv32_load_fp_imm = rv32_i_imm; //wire [31:0] rv32_store_fp_imm = rv32_s_imm; //以下代码是通过and or逻辑实现的5路并行多路选择器 wire [31:0] rv32_imm = ({32{rv32_imm_sel_i}} & rv32_i_imm) | ({32{rv32_imm_sel_s}} & rv32_s_imm) | ({32{rv32_imm_sel_b}} & rv32_b_imm) | ({32{rv32_imm_sel_u}} & rv32_u_imm) | ({32{rv32_imm_sel_j}} & rv32_j_imm) ; wire rv32_need_imm = rv32_imm_sel_i | rv32_imm_sel_s | rv32_imm_sel_b | rv32_imm_sel_u | rv32_imm_sel_j ; //以下是10输入并行多路选择器，根据不同的立即数类型，选择生成16位指令的最终立即数。 wire [31:0] rv16_imm = ({32{rv16_imm_sel_cis }} & rv16_cis_imm) | ({32{rv16_imm_sel_cili }} & rv16_cili_imm) | ({32{rv16_imm_sel_cilui }} & rv16_cilui_imm) | ({32{rv16_imm_sel_ci16sp}} & rv16_ci16sp_imm) | ({32{rv16_imm_sel_css }} & rv16_css_imm) | ({32{rv16_imm_sel_ciw }} & rv16_ciw_imm) | ({32{rv16_imm_sel_cl }} & rv16_cl_imm) | ({32{rv16_imm_sel_cs }} & rv16_cs_imm) | ({32{rv16_imm_sel_cb }} & rv16_cb_imm) | ({32{rv16_imm_sel_cj }} & rv16_cj_imm) ; wire rv16_need_imm = rv16_imm_sel_cis | rv16_imm_sel_cili | rv16_imm_sel_cilui | rv16_imm_sel_ci16sp | rv16_imm_sel_css | rv16_imm_sel_ciw | rv16_imm_sel_cl | rv16_imm_sel_cs | rv16_imm_sel_cb | rv16_imm_sel_cj ; assign need_imm = rv32 ? rv32_need_imm : rv16_need_imm; //根据是rv32还是rv16，产生最终的立即数 assign dec_imm = rv32 ? rv32_imm : rv16_imm; assign dec_pc = i_pc; // 根据指令类型，产生最终的信息总线。 assign dec_info = ({`E203_DECINFO_WIDTH{alu_op}} & {{`E203_DECINFO_WIDTH-`E203_DECINFO_ALU_WIDTH{1'b0}},alu_info_bus}) | ({`E203_DECINFO_WIDTH{amoldst_op}} & {{`E203_DECINFO_WIDTH-`E203_DECINFO_AGU_WIDTH{1'b0}},agu_info_bus}) | ({`E203_DECINFO_WIDTH{bjp_op}} & {{`E203_DECINFO_WIDTH-`E203_DECINFO_BJP_WIDTH{1'b0}},bjp_info_bus}) | ({`E203_DECINFO_WIDTH{csr_op}} & {{`E203_DECINFO_WIDTH-`E203_DECINFO_CSR_WIDTH{1'b0}},csr_info_bus}) | ({`E203_DECINFO_WIDTH{muldiv_op}} & {{`E203_DECINFO_WIDTH-`E203_DECINFO_CSR_WIDTH{1'b0}},muldiv_info_bus}) ; wire legl_ops = alu_op | amoldst_op | bjp_op | csr_op | muldiv_op ;
解码16位指令的寄存器。
// To decode the registers for Rv16, divided into 8 groups wire rv16_format_cr = rv16_jalr_mv_add; wire rv16_format_ci = rv16_lwsp | rv16_flwsp | rv16_fldsp | rv16_li | rv16_lui_addi16sp | rv16_addi | rv16_slli; wire rv16_format_css = rv16_swsp | rv16_fswsp | rv16_fsdsp; wire rv16_format_ciw = rv16_addi4spn; wire rv16_format_cl = rv16_lw | rv16_flw | rv16_fld; wire rv16_format_cs = rv16_sw | rv16_fsw | rv16_fsd | rv16_subxororand; wire rv16_format_cb = rv16_beqz | rv16_bnez | rv16_srli | rv16_srai | rv16_andi; wire rv16_format_cj = rv16_j | rv16_jal; // In CR Cases: // * JR: rs1= rs1(coded), rs2= x0 (coded), rd = x0 (implicit) // * JALR: rs1= rs1(coded), rs2= x0 (coded), rd = x1 (implicit) // * MV: rs1= x0 (implicit), rs2= rs2(coded), rd = rd (coded) // * ADD: rs1= rs1(coded), rs2= rs2(coded), rd = rd (coded) // * eBreak: rs1= rs1(coded), rs2= x0 (coded), rd = x0 (coded) wire rv16_need_cr_rs1 = rv16_format_cr & 1'b1; wire rv16_need_cr_rs2 = rv16_format_cr & 1'b1; wire rv16_need_cr_rd = rv16_format_cr & 1'b1; wire [`E203_RFIDX_WIDTH-1:0] rv16_cr_rs1 = rv16_mv ? `E203_RFIDX_WIDTH'd0 : rv16_rs1[`E203_RFIDX_WIDTH-1:0]; wire [`E203_RFIDX_WIDTH-1:0] rv16_cr_rs2 = rv16_rs2[`E203_RFIDX_WIDTH-1:0]; // The JALR and JR difference in encoding is just the rv16_instr[12] wire [`E203_RFIDX_WIDTH-1:0] rv16_cr_rd = (rv16_jalr | rv16_jr)? {{`E203_RFIDX_WIDTH-1{1'b0}},rv16_instr[12]} : rv16_rd[`E203_RFIDX_WIDTH-1:0]; // In CI Cases: // * LWSP: rs1= x2 (implicit), rd = rd // * LI/LUI: rs1= x0 (implicit), rd = rd // * ADDI: rs1= rs1(implicit), rd = rd // * ADDI16SP: rs1= rs1(implicit), rd = rd // * SLLI: rs1= rs1(implicit), rd = rd wire rv16_need_ci_rs1 = rv16_format_ci & 1'b1; wire rv16_need_ci_rs2 = rv16_format_ci & 1'b0; wire rv16_need_ci_rd = rv16_format_ci & 1'b1; wire [`E203_RFIDX_WIDTH-1:0] rv16_ci_rs1 = (rv16_lwsp | rv16_flwsp | rv16_fldsp) ? `E203_RFIDX_WIDTH'd2 : (rv16_li | rv16_lui) ? `E203_RFIDX_WIDTH'd0 : rv16_rs1[`E203_RFIDX_WIDTH-1:0]; wire [`E203_RFIDX_WIDTH-1:0] rv16_ci_rs2 = `E203_RFIDX_WIDTH'd0; wire [`E203_RFIDX_WIDTH-1:0] rv16_ci_rd = rv16_rd[`E203_RFIDX_WIDTH-1:0]; // In CSS Cases: // * SWSP: rs1 = x2 (implicit), rs2= rs2 wire rv16_need_css_rs1 = rv16_format_css & 1'b1; wire rv16_need_css_rs2 = rv16_format_css & 1'b1; wire rv16_need_css_rd = rv16_format_css & 1'b0; wire [`E203_RFIDX_WIDTH-1:0] rv16_css_rs1 = `E203_RFIDX_WIDTH'd2; wire [`E203_RFIDX_WIDTH-1:0] rv16_css_rs2 = rv16_rs2[`E203_RFIDX_WIDTH-1:0]; wire [`E203_RFIDX_WIDTH-1:0] rv16_css_rd = `E203_RFIDX_WIDTH'd0; // In CIW cases: // * ADDI4SPN: rdd = rdd, rss1= x2 (implicit) wire rv16_need_ciw_rss1 = rv16_format_ciw & 1'b1; wire rv16_need_ciw_rss2 = rv16_format_ciw & 1'b0; wire rv16_need_ciw_rdd = rv16_format_ciw & 1'b1; wire [`E203_RFIDX_WIDTH-1:0] rv16_ciw_rss1 = `E203_RFIDX_WIDTH'd2; wire [`E203_RFIDX_WIDTH-1:0] rv16_ciw_rss2 = `E203_RFIDX_WIDTH'd0; wire [`E203_RFIDX_WIDTH-1:0] rv16_ciw_rdd = rv16_rdd[`E203_RFIDX_WIDTH-1:0]; // In CL cases: // * LW: rss1 = rss1, rdd= rdd wire rv16_need_cl_rss1 = rv16_format_cl & 1'b1; wire rv16_need_cl_rss2 = rv16_format_cl & 1'b0; wire rv16_need_cl_rdd = rv16_format_cl & 1'b1; wire [`E203_RFIDX_WIDTH-1:0] rv16_cl_rss1 = rv16_rss1[`E203_RFIDX_WIDTH-1:0]; wire [`E203_RFIDX_WIDTH-1:0] rv16_cl_rss2 = `E203_RFIDX_WIDTH'd0; wire [`E203_RFIDX_WIDTH-1:0] rv16_cl_rdd = rv16_rdd[`E203_RFIDX_WIDTH-1:0]; // In CS cases: // * SW: rdd = none(implicit), rss1= rss1 , rss2=rss2 // * SUBXORORAND: rdd = rss1, rss1= rss1(coded), rss2=rss2 wire rv16_need_cs_rss1 = rv16_format_cs & 1'b1; wire rv16_need_cs_rss2 = rv16_format_cs & 1'b1; wire rv16_need_cs_rdd = rv16_format_cs & rv16_subxororand; wire [`E203_RFIDX_WIDTH-1:0] rv16_cs_rss1 = rv16_rss1[`E203_RFIDX_WIDTH-1:0]; wire [`E203_RFIDX_WIDTH-1:0] rv16_cs_rss2 = rv16_rss2[`E203_RFIDX_WIDTH-1:0]; wire [`E203_RFIDX_WIDTH-1:0] rv16_cs_rdd = rv16_rss1[`E203_RFIDX_WIDTH-1:0]; // In CB cases: // * BEQ/BNE: rdd = none(implicit), rss1= rss1, rss2=x0(implicit) // * SRLI/SRAI/ANDI: rdd = rss1 , rss1= rss1, rss2=none(implicit) wire rv16_need_cb_rss1 = rv16_format_cb & 1'b1; wire rv16_need_cb_rss2 = rv16_format_cb & (rv16_beqz | rv16_bnez); wire rv16_need_cb_rdd = rv16_format_cb & (~(rv16_beqz | rv16_bnez)); wire [`E203_RFIDX_WIDTH-1:0] rv16_cb_rss1 = rv16_rss1[`E203_RFIDX_WIDTH-1:0]; wire [`E203_RFIDX_WIDTH-1:0] rv16_cb_rss2 = `E203_RFIDX_WIDTH'd0; wire [`E203_RFIDX_WIDTH-1:0] rv16_cb_rdd = rv16_rss1[`E203_RFIDX_WIDTH-1:0]; // In CJ cases: // * J: rdd = x0(implicit) // * JAL: rdd = x1(implicit) wire rv16_need_cj_rss1 = rv16_format_cj & 1'b0; wire rv16_need_cj_rss2 = rv16_format_cj & 1'b0; wire rv16_need_cj_rdd = rv16_format_cj & 1'b1; wire [`E203_RFIDX_WIDTH-1:0] rv16_cj_rss1 = `E203_RFIDX_WIDTH'd0; wire [`E203_RFIDX_WIDTH-1:0] rv16_cj_rss2 = `E203_RFIDX_WIDTH'd0; wire [`E203_RFIDX_WIDTH-1:0] rv16_cj_rdd = rv16_j ? `E203_RFIDX_WIDTH'd0 : `E203_RFIDX_WIDTH'd1; // rv16_format_cr // rv16_format_ci // rv16_format_css // rv16_format_ciw // rv16_format_cl // rv16_format_cs // rv16_format_cb // rv16_format_cj wire rv16_need_rs1 = rv16_need_cr_rs1 | rv16_need_ci_rs1 | rv16_need_css_rs1; wire rv16_need_rs2 = rv16_need_cr_rs2 | rv16_need_ci_rs2 | rv16_need_css_rs2; wire rv16_need_rd = rv16_need_cr_rd | rv16_need_ci_rd | rv16_need_css_rd; wire rv16_need_rss1 = rv16_need_ciw_rss1|rv16_need_cl_rss1|rv16_need_cs_rss1|rv16_need_cb_rss1|rv16_need_cj_rss1; wire rv16_need_rss2 = rv16_need_ciw_rss2|rv16_need_cl_rss2|rv16_need_cs_rss2|rv16_need_cb_rss2|rv16_need_cj_rss2; wire rv16_need_rdd = rv16_need_ciw_rdd |rv16_need_cl_rdd |rv16_need_cs_rdd |rv16_need_cb_rdd |rv16_need_cj_rdd ; wire rv16_rs1en = (rv16_need_rs1 | rv16_need_rss1); wire rv16_rs2en = (rv16_need_rs2 | rv16_need_rss2); wire rv16_rden = (rv16_need_rd | rv16_need_rdd ); wire [`E203_RFIDX_WIDTH-1:0] rv16_rs1idx; wire [`E203_RFIDX_WIDTH-1:0] rv16_rs2idx; wire [`E203_RFIDX_WIDTH-1:0] rv16_rdidx ; assign rv16_rs1idx = ({`E203_RFIDX_WIDTH{rv16_need_cr_rs1 }} & rv16_cr_rs1) | ({`E203_RFIDX_WIDTH{rv16_need_ci_rs1 }} & rv16_ci_rs1) | ({`E203_RFIDX_WIDTH{rv16_need_css_rs1}} & rv16_css_rs1) | ({`E203_RFIDX_WIDTH{rv16_need_ciw_rss1}} & rv16_ciw_rss1) | ({`E203_RFIDX_WIDTH{rv16_need_cl_rss1}} & rv16_cl_rss1) | ({`E203_RFIDX_WIDTH{rv16_need_cs_rss1}} & rv16_cs_rss1) | ({`E203_RFIDX_WIDTH{rv16_need_cb_rss1}} & rv16_cb_rss1) | ({`E203_RFIDX_WIDTH{rv16_need_cj_rss1}} & rv16_cj_rss1) ; assign rv16_rs2idx = ({`E203_RFIDX_WIDTH{rv16_need_cr_rs2 }} & rv16_cr_rs2) | ({`E203_RFIDX_WIDTH{rv16_need_ci_rs2 }} & rv16_ci_rs2) | ({`E203_RFIDX_WIDTH{rv16_need_css_rs2}} & rv16_css_rs2) | ({`E203_RFIDX_WIDTH{rv16_need_ciw_rss2}} & rv16_ciw_rss2) | ({`E203_RFIDX_WIDTH{rv16_need_cl_rss2}} & rv16_cl_rss2) | ({`E203_RFIDX_WIDTH{rv16_need_cs_rss2}} & rv16_cs_rss2) | ({`E203_RFIDX_WIDTH{rv16_need_cb_rss2}} & rv16_cb_rss2) | ({`E203_RFIDX_WIDTH{rv16_need_cj_rss2}} & rv16_cj_rss2) ; assign rv16_rdidx = ({`E203_RFIDX_WIDTH{rv16_need_cr_rd }} & rv16_cr_rd) | ({`E203_RFIDX_WIDTH{rv16_need_ci_rd }} & rv16_ci_rd) | ({`E203_RFIDX_WIDTH{rv16_need_css_rd}} & rv16_css_rd) | ({`E203_RFIDX_WIDTH{rv16_need_ciw_rdd}} & rv16_ciw_rdd) | ({`E203_RFIDX_WIDTH{rv16_need_cl_rdd}} & rv16_cl_rdd) | ({`E203_RFIDX_WIDTH{rv16_need_cs_rdd}} & rv16_cs_rdd) | ({`E203_RFIDX_WIDTH{rv16_need_cb_rdd}} & rv16_cb_rdd) | ({`E203_RFIDX_WIDTH{rv16_need_cj_rdd}} & rv16_cj_rdd) ; assign dec_rs1idx = rv32 ? rv32_rs1[`E203_RFIDX_WIDTH-1:0] : rv16_rs1idx; assign dec_rs2idx = rv32 ? rv32_rs2[`E203_RFIDX_WIDTH-1:0] : rv16_rs2idx; assign dec_rdidx = rv32 ? rv32_rd [`E203_RFIDX_WIDTH-1:0] : rv16_rdidx ; assign dec_rs1en = rv32 ? rv32_need_rs1 : (rv16_rs1en & (~(rv16_rs1idx == `E203_RFIDX_WIDTH'b0))); assign dec_rs2en = rv32 ? rv32_need_rs2 : (rv16_rs2en & (~(rv16_rs2idx == `E203_RFIDX_WIDTH'b0))); assign dec_rdwen = rv32 ? rv32_need_rd : (rv16_rden & (~(rv16_rdidx == `E203_RFIDX_WIDTH'b0))); assign dec_rs1x0 = (dec_rs1idx == `E203_RFIDX_WIDTH'b0); assign dec_rs2x0 = (dec_rs2idx == `E203_RFIDX_WIDTH'b0); wire rv_index_ilgl; `ifdef E203_RFREG_NUM_IS_4 //{ assign rv_index_ilgl = (| dec_rs1idx[`E203_RFIDX_WIDTH-1:2]) |(| dec_rs2idx[`E203_RFIDX_WIDTH-1:2]) |(| dec_rdidx [`E203_RFIDX_WIDTH-1:2]) ; `endif//} `ifdef E203_RFREG_NUM_IS_8 //{ assign rv_index_ilgl = (| dec_rs1idx[`E203_RFIDX_WIDTH-1:3]) |(| dec_rs2idx[`E203_RFIDX_WIDTH-1:3]) |(| dec_rdidx [`E203_RFIDX_WIDTH-1:3]) ; `endif//} `ifdef E203_RFREG_NUM_IS_16 //{ assign rv_index_ilgl = (| dec_rs1idx[`E203_RFIDX_WIDTH-1:4]) |(| dec_rs2idx[`E203_RFIDX_WIDTH-1:4]) |(| dec_rdidx [`E203_RFIDX_WIDTH-1:4]) ; `endif//} `ifdef E203_RFREG_NUM_IS_32 //{ //Never happen this illegal exception assign rv_index_ilgl = 1'b0; `endif//} assign dec_rv32 = rv32; assign dec_bjp_imm = ({32{rv16_jal | rv16_j }} & rv16_jjal_imm) | ({32{rv16_jalr_mv_add }} & rv16_jrjalr_imm) | ({32{rv16_beqz | rv16_bnez }} & rv16_bxx_imm) | ({32{rv32_jal }} & rv32_jal_imm) | ({32{rv32_jalr }} & rv32_jalr_imm) | ({32{rv32_branch }} & rv32_bxx_imm) ; assign dec_jalr_rs1idx = rv32 ? rv32_rs1[`E203_RFIDX_WIDTH-1:0] : rv16_rs1[`E203_RFIDX_WIDTH-1:0]; assign dec_misalgn = i_misalgn; assign dec_buserr = i_buserr ; assign dec_ilegl = (rv_all0s1s_ilgl) | (rv_index_ilgl) | (rv16_addi16sp_ilgl) | (rv16_addi4spn_ilgl) | (rv16_li_lui_ilgl) | (rv16_sxxi_shamt_ilgl) | (rv32_sxxi_shamt_ilgl) | (rv32_dret_ilgl) | (rv16_lwsp_ilgl) | (~legl_ops);