insn_alu_a.v

   1 `ifdef EXECUTE
   2         `INSN_ALU_A: begin
   3                 `EXEC_NEWCYCLE
   4                 `EXEC_INC_PC
   5         end
   6 `endif
   7
   8 `ifdef WRITEBACK
   9         `INSN_ALU_A: begin
  10                 case(opcode[5:3])
  11                 `INSN_alu_RLCA: begin
  12                         `_A <= {`_A[6:0],`_A[7]};
  13                         `_F <= {`_F[7:5],`_A[7],`_F[3:0]};
  14                 end
  15                 `INSN_alu_RRCA: begin
  16                         `_A <= {`_A[0],`_A[7:1]};
  17                         `_F <= {`_F[7:5],`_A[0],`_F[3:0]};
  18                 end
  19                 `INSN_alu_RLA: begin
  20                         `_A <= {`_A[6:0],`_F[4]};
  21                         `_F <= {`_F[7:5],`_A[7],`_F[3:0]};
  22                 end
  23                 `INSN_alu_RRA: begin
  24                         `_A <= {`_A[4],`_A[7:1]};
  25                         `_F <= {`_F[7:5],`_A[0],`_F[3:0]};
  26                 end
  27                 `INSN_alu_CPL: begin
  28                         `_A <= ~`_A;
  29                         `_F <= {`_F[7],1'b1,1'b1,`_F[4:0]};
  30                 end
  31                 `INSN_alu_SCF: begin
  32                         `_F <= {`_F[7:5],1'b1,`_F[3:0]};
  33                 end
  34                 `INSN_alu_CCF: begin
  35                         `_F <= {`_F[7:5],~`_F[4],`_F[3:0]};
  36                 end
  37                 endcase
  38         end
  39 `endif