Move the core to core/

[fpgaboy.git] / core / insn_alu_a.v

diff --git a/core/insn_alu_a.v b/core/insn_alu_a.v
new file mode 100644 (file)
index 0000000..57a74fc
--- /dev/null
+++ b/core/insn_alu_a.v
@@ -0,0 +1,39 @@
+`ifdef EXECUTE
+       `INSN_ALU_A: begin
+               `EXEC_NEWCYCLE
+               `EXEC_INC_PC
+       end
+`endif
+
+`ifdef WRITEBACK
+       `INSN_ALU_A: begin
+               case(opcode[5:3])
+               `INSN_alu_RLCA: begin
+                       `_A <= {`_A[6:0],`_A[7]};
+                       `_F <= {`_F[7:5],`_A[7],`_F[3:0]};
+               end
+               `INSN_alu_RRCA: begin
+                       `_A <= {`_A[0],`_A[7:1]};
+                       `_F <= {`_F[7:5],`_A[0],`_F[3:0]};
+               end
+               `INSN_alu_RLA: begin
+                       `_A <= {`_A[6:0],`_F[4]};
+                       `_F <= {`_F[7:5],`_A[7],`_F[3:0]};
+               end
+               `INSN_alu_RRA: begin
+                       `_A <= {`_A[4],`_A[7:1]};
+                       `_F <= {`_F[7:5],`_A[0],`_F[3:0]};
+               end
+               `INSN_alu_CPL: begin
+                       `_A <= ~`_A;
+                       `_F <= {`_F[7],1'b1,1'b1,`_F[4:0]};
+               end
+               `INSN_alu_SCF: begin
+                       `_F <= {`_F[7:5],1'b1,`_F[3:0]};
+               end
+               `INSN_alu_CCF: begin
+                       `_F <= {`_F[7:5],~`_F[4],`_F[3:0]};
+               end
+               endcase
+       end
+`endif