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[fpgaboy.git] / insn_incdec16.v
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1`ifdef EXECUTE
2 `INSN_INCDEC16: begin
3 case (cycle)
4 0: case (opcode[5:4])
5 `INSN_reg16_BC: {tmp,tmp2} <= `_BC;
6 `INSN_reg16_DE: {tmp,tmp2} <= `_DE;
7 `INSN_reg16_HL: {tmp,tmp2} <= `_HL;
8 `INSN_reg16_SP: {tmp,tmp2} <= `_SP;
9 endcase
10 1: begin
11 `EXEC_INC_PC
12 `EXEC_NEWCYCLE
13 end
14 endcase
15 end
16`endif
17
18`ifdef WRITEBACK
19 `INSN_INCDEC16: begin
20 case (cycle)
21 0: {tmp,tmp2} <= {tmp,tmp2} +
22 (opcode[3] ? 16'hFFFF : 16'h0001);
23 1: case (opcode[5:4])
24 `INSN_reg16_BC: `_BC <= {tmp,tmp2};
25 `INSN_reg16_DE: `_DE <= {tmp,tmp2};
26 `INSN_reg16_HL: `_HL <= {tmp,tmp2};
27 `INSN_reg16_SP: `_SP <= {tmp,tmp2};
28 endcase
29 endcase
30 end
31`endif
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