[Add] add loaduse.v & fix little bug

lacpu/rtl/cpu/exe_stage.v

@@ -190,15 +190,15 @@ module exe_stage(
     
     always @(posedge clk) begin
         if(reset) begin
-            div_divisor_valid_reg   <= 0'b0;
+            div_divisor_valid_reg   <= 1'b0;
-            div_divisor_ready_flag  <= 0'b0;
+            div_divisor_ready_flag  <= 1'b0;
         end
         else if(div_divisor_valid_reg && div_divisor_ready) begin
-            div_divisor_valid_reg   <= 0'b0;
+            div_divisor_valid_reg   <= 1'b0;
-            div_divisor_ready_flag  <= 0'b1;
+            div_divisor_ready_flag  <= 1'b1;
         end
         else if((es_inst_divw || es_inst_modw) && !div_divisor_ready_flag) begin
-            div_divisor_valid_reg   <= 0'b1;
+            div_divisor_valid_reg   <= 1'b1;
         end
         else if(es_ready_go) begin
             div_divisor_ready_flag  <= 1'b0;
@@ -206,15 +206,15 @@ module exe_stage(
     end
     always @(posedge clk) begin
         if(reset) begin
-            div_dividend_valid_reg   <= 0'b0;
+            div_dividend_valid_reg   <= 1'b0;
-            div_dividend_ready_flag  <= 0'b0;
+            div_dividend_ready_flag  <= 1'b0;
         end
         else if(div_dividend_valid_reg && div_dividend_ready) begin
-            div_dividend_valid_reg   <= 0'b0;
+            div_dividend_valid_reg   <= 1'b0;
-            div_dividend_ready_flag  <= 0'b1;
+            div_dividend_ready_flag  <= 1'b1;
         end
         else if((es_inst_divw || es_inst_modw) && !div_dividend_ready_flag) begin
-            div_dividend_valid_reg   <= 0'b1;
+            div_dividend_valid_reg   <= 1'b1;
         end
         else if(es_ready_go) begin
             div_dividend_ready_flag  <= 1'b0;
@@ -222,15 +222,15 @@ module exe_stage(
     end
     always @(posedge clk) begin
         if(reset) begin
-            divu_divisor_valid_reg   <= 0'b0;
+            divu_divisor_valid_reg   <= 1'b0;
-            divu_divisor_ready_flag  <= 0'b0;
+            divu_divisor_ready_flag  <= 1'b0;
         end
         else if(divu_divisor_valid_reg && divu_divisor_ready) begin
-            divu_divisor_valid_reg   <= 0'b0;
+            divu_divisor_valid_reg   <= 1'b0;
-            divu_divisor_ready_flag  <= 0'b1;
+            divu_divisor_ready_flag  <= 1'b1;
         end
         else if((es_inst_divw || es_inst_modw) && !divu_divisor_ready_flag) begin
-            divu_divisor_valid_reg   <= 0'b1;
+            divu_divisor_valid_reg   <= 1'b1;
         end
         else if(es_ready_go) begin
             divu_divisor_ready_flag  <= 1'b0;
@@ -238,15 +238,15 @@ module exe_stage(
     end
     always @(posedge clk) begin
         if(reset) begin
-            divu_dividend_valid_reg   <= 0'b0;
+            divu_dividend_valid_reg   <= 1'b0;
-            divu_dividend_ready_flag  <= 0'b0;
+            divu_dividend_ready_flag  <= 1'b0;
         end
         else if(divu_dividend_valid_reg && divu_dividend_ready) begin
-            divu_dividend_valid_reg   <= 0'b0;
+            divu_dividend_valid_reg   <= 1'b0;
-            divu_dividend_ready_flag  <= 0'b1;
+            divu_dividend_ready_flag  <= 1'b1;
         end
         else if((es_inst_divw || es_inst_modw) && !divu_dividend_ready_flag) begin
-            divu_dividend_valid_reg   <= 0'b1;
+            divu_dividend_valid_reg   <= 1'b1;
         end
         else if(es_ready_go) begin
             divu_dividend_ready_flag  <= 1'b0;

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

lacpu/rtl/cpu/mycpu.v

@@ -15,4 +15,7 @@
 
     `define MS_TO_ES_BUS_WD 32
     `define WS_TO_ES_BUS_WD 32
+
+    `define DS_TO_LU_BUS_WD 10
+    `define ES_TO_LU_BUS_WD 10
 `endif

lacpu/run_vivado/la32r/la32r.xpr

@@ -152,6 +152,14 @@
           <Attr Name="UsedIn" Val="simulation"/>
         </FileInfo>
       </File>
+      <File Path="$PPRDIR/../../rtl/cpu/loaduse.v">
+        <FileInfo>
+          <Attr Name="AutoDisabled" Val="1"/>
+          <Attr Name="UsedIn" Val="synthesis"/>
+          <Attr Name="UsedIn" Val="implementation"/>
+          <Attr Name="UsedIn" Val="simulation"/>
+        </FileInfo>
+      </File>
       <Config>
         <Option Name="DesignMode" Val="RTL"/>
         <Option Name="TopModule" Val="soc_lite_top"/>