1 files changed, 47 insertions, 0 deletions
diff --git a/rtl/src/alu.v b/rtl/src/alu.v
new file mode 100644
index 0000000..8a265ee
--- /dev/null
+++ b/rtl/src/alu.v
@@ -0,0 +1,47 @@
+module alu (
+  input [31:0] a, 
+  input [31:0] b,
+
+  input [3:0] op,
+  
+  output reg [31:0] result,
+  output zero
+);
+
+wire [31:0] arithmetic_result, logic_result, shift_result;
+
+arithmetic_unit au (
+  .a(a),
+  .b(b),
+  .op(op[1:0]),
+  .result(arithmetic_result)
+);
+
+logic_unit lu (
+  .a(a),
+  .b(b),
+  .op(op[1:0]),
+  .result(logic_result)
+);
+
+shift_unit su (
+  .a(a),
+  .b(b[4:0]),
+  .op(op[1:0]),
+  .result(shift_result)
+);
+
+`include "include/consts.vh"
+
+always @ (*) begin
+  case (op[3:2])
+    ALU_OP_ARITHMETIC: result = arithmetic_result; // ARITHMETIC
+    ALU_OP_LOGIC:      result = logic_result;      // LOGIC
+    ALU_OP_SHIFT:      result = shift_result;      // SHIFT
+    default:           result = 31'b0;
+  endcase
+end
+
+assign zero = result == 32'b0;
+
+endmodule