merging changes from OPAE branch making this branch

old_rtl/VX_priority_encoder_w_mask.v

@@ -0,0 +1,32 @@
+`include "../VX_define.v"
+module VX_priority_encoder_w_mask
+  #(
+  	parameter N = 10
+  )
+  (
+    input  wire[N-1:0]        valids,
+    output reg [N-1:0]        mask,
+    //output reg[$clog2(N)-1:0] index,
+    output reg[(`CLOG2(N))-1:0] index,
+    //output reg[`CLOG2(N):0] index, // eh
+    output reg                found
+  );
+
+	integer i;
+	always @(valids) begin
+		index = 0;
+		found = 0;
+		// mask  = 0;
+		for (i = 0; i < N; i=i+1) begin
+			if (valids[i]) begin
+				//index = i[$clog2(N)-1:0];
+        		index = i[(`CLOG2(N))-1:0];
+				found = 1;
+				// mask[index] = (1 << i);
+				// $display("%h",(1 << i));
+			end
+		end
+	end
+
+	assign mask = found ? (1 << index) : 0;
+endmodule