module regfile (input         clk, 
		input         we3, 
		input  [4:0]  ra1, ra2, wa3, 
		input  [31:0] wd3, 
		output [31:0] rd1, rd2);

   reg [31:0] 		      rf[31:0];

   // three ported register file
   // read two ports combinationally
   // write third port on rising edge of clock
   // register 0 hardwired to 0

   always @(posedge clk)
     if (we3 && wa3!=0) rf[wa3] <= wd3;	

   assign rd1 = (ra1 != 0) ? rf[ra1] : 0;
   assign rd2 = (ra2 != 0) ? rf[ra2] : 0;
   
endmodule // regfile