[Add] add loaduse.v & fix little bug

lacpu/rtl/cpu/loaduse.v

@@ -0,0 +1,39 @@
+`include "mycpu.v"
+
+module loaduse(
+    input                          clk,
+    input                          reset,
+    
+    input  [`DS_TO_LU_BUS_WD -1:0] ds_to_lu_bus,
+    input  [`ES_TO_LU_BUS_WD -1:0] es_to_lu_bus,
+
+    output                         loaduse
+);
+    wire [4:0] ds_rf_raddr1;
+    wire [4:0] ds_rf_raddr2;
+    wire [4:0] es_load_op;
+    wire [4:0] es_dest;
+    
+    reg [`DS_TO_LU_BUS_WD -1:0] ds_to_lu_bus_reg;
+    reg [`ES_TO_LU_BUS_WD -1:0] es_to_lu_bus_reg;
+
+    wire loaduse;
+    
+    always @(posedge clk) begin
+        if(reset) begin
+            ds_to_lu_bus_reg <= 0;
+            es_to_lu_bus_reg <= 0;
+        end
+        else begin
+            ds_to_lu_bus_reg <= ds_to_lu_bus;
+            es_to_lu_bus_reg <= es_to_lu_bus;
+        end
+    end
+
+
+    assign {ds_rf_rdata1, ds_rf_rdata2} = ds_to_lu_bus_reg;
+    assign {es_dest     , es_load_op  } = es_to_lu_bus_reg;
+    
+    assign loaduse = ^es_load_op && 
+                 (((ds_rf_rdata1 == es_dest) && (ds_rf_rdata1 != 5'b0)) || ((ds_rf_rdata2 == es_dest) && (ds_rf_rdata2 != 5'b0)));
+endmodule