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[fpgaboy.git] / core / insn_push_reg.v
1 `define INSN_PUSH_reg           9'b011xx0101
2
3 `ifdef EXECUTE
4         `INSN_PUSH_reg: begin   /* PUSH is 16 cycles! */
5                 case (cycle)
6                 0:      case (opcode[5:4])
7                         `INSN_stack_AF: `EXEC_WRITE(`_SP - 1, `_A)
8                         `INSN_stack_BC: `EXEC_WRITE(`_SP - 1, `_B)
9                         `INSN_stack_DE: `EXEC_WRITE(`_SP - 1, `_D)
10                         `INSN_stack_HL: `EXEC_WRITE(`_SP - 1, `_H)
11                         endcase
12                 1:      case (opcode[5:4])
13                         `INSN_stack_AF: `EXEC_WRITE(`_SP - 2, `_F)
14                         `INSN_stack_BC: `EXEC_WRITE(`_SP - 2, `_C)
15                         `INSN_stack_DE: `EXEC_WRITE(`_SP - 2, `_E)
16                         `INSN_stack_HL: `EXEC_WRITE(`_SP - 2, `_L)
17                         endcase
18                 2:      begin /* Twiddle thumbs. */ end
19                 3:      begin
20                                 `EXEC_NEWCYCLE
21                                 `EXEC_INC_PC
22                         end
23                 endcase
24         end
25 `endif
26
27 `ifdef WRITEBACK
28         `INSN_PUSH_reg: begin   /* PUSH is 16 cycles! */
29                 case (cycle)
30                 0:      begin /* type F */ end
31                 1:      begin /* type F */ end
32                 2:      begin /* type F */ end
33                 3:      `_SP <= `_SP - 2;
34                 endcase
35         end
36 `endif
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