[Add] la32r cpu framework add

lacpu/rtl/cpu/tools.v

@@ -0,0 +1,24 @@
+module decoder_5_32(
+    input  [ 4:0] in,
+    output [31:0] out
+);
+
+    genvar i;
+    generate for (i=0; i<32; i=i+1) begin : gen_for_dec_5_32
+        assign out[i] = (in == i);
+    end endgenerate
+
+    endmodule
+
+
+    module decoder_3_8(
+        input  [2:0] in,
+        output [7:0] out
+    );
+
+    genvar i;
+    generate for (i=0; i<8; i=i+1) begin : gen_for_dec_3_8
+        assign out[i] = (in == i);
+    end endgenerate
+
+endmodule