Move the core to core/
[fpgaboy.git] / core / insn_alu_ext.v
1 `ifdef EXECUTE
2         `INSN_ALU_EXT: begin
3                 if ((opcode[2:0] == `INSN_reg_dHL) && (cycle == 0))
4                         `EXEC_READ(`_HL)
5                 else begin
6                         `EXEC_INC_PC
7                         case (opcode[2:0])
8                         `INSN_reg_A:    tmp <= `_A;
9                         `INSN_reg_B:    tmp <= `_B;
10                         `INSN_reg_C:    tmp <= `_C;
11                         `INSN_reg_D:    tmp <= `_D;
12                         `INSN_reg_E:    tmp <= `_E;
13                         `INSN_reg_H:    tmp <= `_H;
14                         `INSN_reg_L:    tmp <= `_L;
15                         `INSN_reg_dHL:  tmp <= rdata;
16                         endcase
17                 end
18         end
19 `endif
20
21 `ifdef WRITEBACK
22         `INSN_ALU_EXT: begin
23                 if (opcode[2:0] == `INSN_reg_dHL) begin
24                         if(cycle == 0) begin end
25                         else if(cycle == 1) begin
26                                 `EXEC_WRITE(`_HL, alu_res)
27                         end else begin
28                                 `EXEC_NEWCYCLE
29                         end
30                 end else begin
31                         case(opcode[2:0])
32                         `INSN_reg_B: `_B <= alu_res;
33                         `INSN_reg_C: `_C <= alu_res;
34                         `INSN_reg_D: `_D <= alu_res;
35                         `INSN_reg_E: `_E <= alu_res;
36                         `INSN_reg_H: `_H <= alu_res;
37                         `INSN_reg_L: `_L <= alu_res;
38                         `INSN_reg_A: `_A <= alu_res;
39                         `INSN_reg_dHL: begin end /* eat dicks */
40                         endcase
41                         `_F <= {f_res,`_F[3:0]};
42                         `EXEC_NEWCYCLE
43                 end
44         end
45 `endif
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