Move the core to core/

[fpgaboy.git] / core / insn_alu_ext.v

diff --git a/core/insn_alu_ext.v b/core/insn_alu_ext.v
new file mode 100644 (file)
index 0000000..1b7825b
--- /dev/null
+++ b/core/insn_alu_ext.v
@@ -0,0 +1,45 @@
+`ifdef EXECUTE
+       `INSN_ALU_EXT: begin
+               if ((opcode[2:0] == `INSN_reg_dHL) && (cycle == 0))
+                       `EXEC_READ(`_HL)
+               else begin
+                       `EXEC_INC_PC
+                       case (opcode[2:0])
+                       `INSN_reg_A:    tmp <= `_A;
+                       `INSN_reg_B:    tmp <= `_B;
+                       `INSN_reg_C:    tmp <= `_C;
+                       `INSN_reg_D:    tmp <= `_D;
+                       `INSN_reg_E:    tmp <= `_E;
+                       `INSN_reg_H:    tmp <= `_H;
+                       `INSN_reg_L:    tmp <= `_L;
+                       `INSN_reg_dHL:  tmp <= rdata;
+                       endcase
+               end
+       end
+`endif
+
+`ifdef WRITEBACK
+       `INSN_ALU_EXT: begin
+               if (opcode[2:0] == `INSN_reg_dHL) begin
+                       if(cycle == 0) begin end
+                       else if(cycle == 1) begin
+                               `EXEC_WRITE(`_HL, alu_res)
+                       end else begin
+                               `EXEC_NEWCYCLE
+                       end
+               end else begin
+                       case(opcode[2:0])
+                       `INSN_reg_B: `_B <= alu_res;
+                       `INSN_reg_C: `_C <= alu_res;
+                       `INSN_reg_D: `_D <= alu_res;
+                       `INSN_reg_E: `_E <= alu_res;
+                       `INSN_reg_H: `_H <= alu_res;
+                       `INSN_reg_L: `_L <= alu_res;
+                       `INSN_reg_A: `_A <= alu_res;
+                       `INSN_reg_dHL: begin end /* eat dicks */
+                       endcase
+                       `_F <= {f_res,`_F[3:0]};
+                       `EXEC_NEWCYCLE
+               end
+       end
+`endif