core/insn_jr-jrcc.v

   1 `define INSN_JR_imm             9'b000011000
   2 `define INSN_JRCC_imm           9'b0001xx000
   3
   4 `ifdef EXECUTE
   5         `INSN_JR_imm,`INSN_JRCC_imm: begin
   6                 case (cycle)
   7                 0:      begin
   8                                 `EXEC_INC_PC
   9                                 `EXEC_READ(`_PC + 1)
  10                         end
  11                 1:      begin
  12                                 `EXEC_INC_PC
  13                                 if (opcode[5]) begin    // i.e., JP cc,nn
  14                                         /* We need to check the condition code to bail out. */
  15                                         case (opcode[4:3])
  16                                         `INSN_cc_NZ:    if (`_F[7]) `EXEC_NEWCYCLE
  17                                         `INSN_cc_Z:     if (~`_F[7]) `EXEC_NEWCYCLE
  18                                         `INSN_cc_NC:    if (`_F[4]) `EXEC_NEWCYCLE
  19                                         `INSN_cc_C:     if (~`_F[4]) `EXEC_NEWCYCLE
  20                                         endcase
  21                                 end
  22                         end
  23                 2:      `EXEC_NEWCYCLE
  24                 endcase
  25         end
  26 `endif
  27
  28 `ifdef WRITEBACK
  29         `INSN_JR_imm,`INSN_JRCC_imm: begin
  30                 case (cycle)
  31                 0:      begin /* type F */ end
  32                 1:      tmp <= rdata;
  33                 2:      `_PC <= `_PC + {tmp[7]?8'hFF:8'h00,tmp};
  34                 endcase
  35         end
  36 `endif