verilator/test_regress/t/t_unroll_signed.v

// $Revision: 1.1 $$Date$$Author$
// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed into the Public Domain, for any use,
// without warranty, 2004 by Wilson Snyder.

module t (/*AUTOARG*/
   // Inputs
   clk
   );

   input clk;

   // Check look unroller
   reg signed	   signed_tests_only = 1'sb1;
   integer 	   total;

   integer	   i;
   reg [31:0] 	   iu;
   reg [31:0]	   dly_to_insure_was_unrolled [1:0];
   reg [2:0] 	   i3;

   integer cyc; initial cyc=0;
   always @ (posedge clk) begin
      cyc <= cyc + 1;
      case (cyc)
	1: begin
	   // >= signed
	   total = 0;
	   for (i=5; i>=0; i=i-1) begin
	      total = total - i -1;
	      dly_to_insure_was_unrolled[i] <= i;
	   end
	   if (total != -21) $stop;
	end
	2: begin
	   // > signed
	   total = 0;
	   for (i=5; i>0; i=i-1) begin
	      total = total - i -1;
	      dly_to_insure_was_unrolled[i] <= i;
	   end
	   if (total != -20) $stop;
	end
	3: begin
	   // < signed
	   total = 0;
	   for (i=1; i<5; i=i+1) begin
	      total = total - i -1;
	      dly_to_insure_was_unrolled[i] <= i;
	   end
	   if (total != -14) $stop;
	end
	4: begin
	   // <= signed
	   total = 0;
	   for (i=1; i<=5; i=i+1) begin
	      total = total - i -1;
	      dly_to_insure_was_unrolled[i] <= i;
	   end
	   if (total != -20) $stop;
	end
	// UNSIGNED
	5: begin
	   // >= unsigned
	   total = 0;
	   for (iu=5; iu>=1; iu=iu-1) begin
	      total = total - iu -1;
	      dly_to_insure_was_unrolled[iu] <= iu;
	   end
	   if (total != -20) $stop;
	end
	6: begin
	   // > unsigned
	   total = 0;
	   for (iu=5; iu>1; iu=iu-1) begin
	      total = total - iu -1;
	      dly_to_insure_was_unrolled[iu] <= iu;
	   end
	   if (total != -18) $stop;
	end
	7: begin
	   // < unsigned
	   total = 0;
	   for (iu=1; iu<5; iu=iu+1) begin
	      total = total - iu -1;
	      dly_to_insure_was_unrolled[iu] <= iu;
	   end
	   if (total != -14) $stop;
	end
	8: begin
	   // <= unsigned
	   total = 0;
	   for (iu=1; iu<=5; iu=iu+1) begin
	      total = total - iu -1;
	      dly_to_insure_was_unrolled[iu] <= iu;
	   end
	   if (total != -20) $stop;
	end
	//===
	9: begin
	   // mostly cover a small index
	   total = 0;
	   for (i3=3'd0; i3<3'd7; i3=i3+3'd1) begin
	      total = total - {29'd0,i3} -1;
	      dly_to_insure_was_unrolled[i3[0]] <= 0;
	   end
	   if (total != -28) $stop;
	end
	//===
	19: begin
	   $write("*-* All Finished *-*\n");
	   $finish;
	end
	default: ;
      endcase
   end
endmodule