git.joshuawise.com / fpgaboy.git / blame
| Commit | Line | Data |
|---|---|---|
| e7fe9dc2 JW |
1 | `define INSN_INCDEC_reg8 9'b000xxx10x |
| 2 | ||
| f2b745a7 JW |
3 | `ifdef EXECUTE |
| 4 | `INSN_INCDEC_reg8: begin | |
| 5 | `EXEC_INC_PC | |
| 6 | `EXEC_NEWCYCLE | |
| 7 | case (opcode[5:3]) | |
| 65d3506e JW |
8 | `INSN_reg_A: tmp <= `_A + (opcode[0] ? 8'hFF : 8'h01); |
| 9 | `INSN_reg_B: tmp <= `_B + (opcode[0] ? 8'hFF : 8'h01); | |
| 10 | `INSN_reg_C: tmp <= `_C + (opcode[0] ? 8'hFF : 8'h01); | |
| 11 | `INSN_reg_D: tmp <= `_D + (opcode[0] ? 8'hFF : 8'h01); | |
| 12 | `INSN_reg_E: tmp <= `_E + (opcode[0] ? 8'hFF : 8'h01); | |
| 13 | `INSN_reg_H: tmp <= `_H + (opcode[0] ? 8'hFF : 8'h01); | |
| 14 | `INSN_reg_L: tmp <= `_L + (opcode[0] ? 8'hFF : 8'h01); | |
| f2b745a7 JW |
15 | endcase |
| 16 | end | |
| 17 | `endif | |
| 18 | ||
| 19 | `ifdef WRITEBACK | |
| 20 | `INSN_INCDEC_reg8: begin | |
| 21 | case (opcode[5:3]) | |
| 65d3506e JW |
22 | `INSN_reg_A: `_A <= tmp; |
| 23 | `INSN_reg_B: `_B <= tmp; | |
| 24 | `INSN_reg_C: `_C <= tmp; | |
| 25 | `INSN_reg_D: `_D <= tmp; | |
| 26 | `INSN_reg_E: `_E <= tmp; | |
| 27 | `INSN_reg_H: `_H <= tmp; | |
| 28 | `INSN_reg_L: `_L <= tmp; | |
| f2b745a7 | 29 | endcase |
| a42afaa9 | 30 | `_F <= { |
| 65d3506e JW |
31 | (tmp == 8'h00) ? 1'b1 : 1'b0, /* Z */ |
| 32 | opcode[0], /* N */ | |
| 33 | (tmp[3:0] == (opcode[0] ? 4'hF : 4'h0)) ? 1'b1 : 1'b0, | |
| 34 | `_F[4:0] | |
| 35 | }; | |
| f2b745a7 JW |
36 | end |
| 37 | `endif |