`define INSN_alu_RLCA 3'b000 `define INSN_alu_RRCA 3'b001 `define INSN_alu_RLA 3'b010 `define INSN_alu_RRA 3'b011 `define INSN_alu_DAA 3'b100 `define INSN_alu_CPL 3'b101 `define INSN_alu_SCF 3'b110 `define INSN_alu_CCF 3'b111 `define INSN_ALU_A 9'b000xxx111 `ifdef LOCALWIRES /* Y U Q */ /* Derived from MESS opc_main.h */ wire [8:0] daa_tmp_n0_h = ((`_F & `FLAG_H) || (`_A[3:0] > 9)) ? {1'b0,`_A} + 9'h06 : {1'b0,`_A}; wire [8:0] daa_tmp_n0 = ((`_F & `FLAG_C) || (daa_tmp_n0_h[8:4] > 9)) ? daa_tmp_n0_h + 9'h60 : daa_tmp_n0_h; wire [8:0] daa_tmp_n_h1 = (`_F & `FLAG_H) ? ({1'b0,`_A} - 9'h06) : {1'b0,`_A}; wire [8:0] daa_tmp_n_h2 = ((`_F & `FLAG_H) && !(`_F & `FLAG_C)) ? {1'b0,daa_tmp_n_h1[7:0]} : daa_tmp_n_h1; wire [8:0] daa_tmp_n = (`_F & `FLAG_C) ? (daa_tmp_n_h2 - 9'h60) : daa_tmp_n_h2; wire [8:0] daa_tmp = (`_F & `FLAG_N) ? daa_tmp_n : daa_tmp_n0; `endif `ifdef EXECUTE `INSN_ALU_A: begin `EXEC_NEWCYCLE `EXEC_INC_PC end `endif `ifdef WRITEBACK `INSN_ALU_A: begin case(opcode[5:3]) `INSN_alu_RLCA: begin `_A <= {`_A[6:0],`_A[7]}; `_F <= {3'b0,`_A[7],`_F[3:0]}; end `INSN_alu_RRCA: begin `_A <= {`_A[0],`_A[7:1]}; `_F <= {3'b0,`_A[0],`_F[3:0]}; end `INSN_alu_RLA: begin `_A <= {`_A[6:0],`_F[4]}; `_F <= {3'b0,`_A[7],`_F[3:0]}; end `INSN_alu_RRA: begin `_A <= {`_F[4],`_A[7:1]}; `_F <= {3'b0,`_A[0],`_F[3:0]}; end `INSN_alu_DAA: begin `_A <= daa_tmp[7:0]; `_F <= { (daa_tmp[7:0] == 0) ? 1'b1 : 8'b0, /* Z */ 2'b00, /* NH */ daa_tmp[8], /* C */ `_F[3:0] }; end `INSN_alu_CPL: begin `_A <= ~`_A; `_F <= {`_F[7],1'b1,1'b1,`_F[4:0]}; end `INSN_alu_SCF: begin `_F <= {`_F[7],3'b001,`_F[3:0]}; end `INSN_alu_CCF: begin `_F <= {`_F[7],2'b00,~`_F[4],`_F[3:0]}; end endcase end `endif