Merge pull request #13 from SergeyDegtyar/master

Add tests for issues from 111 to 527 that I could automate.

regression/Makefile

@@ -6,7 +6,7 @@ clean::
 
 define template
 $(foreach design,$(1),
-$(foreach script,verify falsify $(2),
+$(foreach script,$(2),
 work:: $(design)/work_$(script)/.stamp
 
 $(design)/work_$(script)/.stamp:
@@ -17,8 +17,8 @@ clean::
 ))
 endef
 
-#case_stmt_assertion
-$(eval $(call template,case_stmt_assertion,case_stmt_assertion))
+#issue_00790
+$(eval $(call template,issue_00790,issue_00790))
 
 #issue_00018
 $(eval $(call template,issue_00018,issue_00018))
@@ -38,7 +38,7 @@ $(eval $(call template,issue_00067,issue_00067))
 #issue_00071
 $(eval $(call template,issue_00071,issue_00071))
 
-#issue_00078 What should be in top.v?
+#issue_00078
 $(eval $(call template,issue_00078,issue_00078))
 
 #issue_00081
@@ -73,34 +73,19 @@ $(eval $(call template,issue_00086,issue_00086))
 $(eval $(call template,issue_00088,issue_00088))
 
 #issue_00089
-#1. Executing Verilog-2005 frontend.
-#Parsing Verilog input from `top.v' to AST representation.
-#top.v:6: ERROR: syntax error, unexpected $undefined
-#$(eval $(call template,issue_00089,issue_00089))
+$(eval $(call template,issue_00089,issue_00089))
 
 #issue_00091
 $(eval $(call template,issue_00091,issue_00091))
 
 #issue_00093
-# correct behavior
-#../top.v:1: syntax error
-#../top.v:1: error: syntax error in left side of continuous assignment.
-#$(eval $(call template,issue_00093,issue_00093))
+$(eval $(call template,issue_00093,issue_00093))
 
 #issue_00095
-#../top.v:1: syntax error
-#../top.v:1: error: Invalid variable list in port declaration.
-#../top.v:1: error: duplicate declaration for net or variable 'c' in 'a'.
-#$(eval $(call template,issue_00095,issue_00095))
+$(eval $(call template,issue_00095,issue_00095))
 
 #issue_00096
-#../top.v:2: syntax error
-#../top.v:1: error: syntax error in integer variable list.
-#../top.v:2: syntax error
-#../top.v:2: error: syntax error in left side of continuous assignment.
-#../top.v:2: syntax error
-#../top.v:2: error: syntax error in left side of continuous assignment.
-#$(eval $(call template,issue_00096,issue_00096))
+$(eval $(call template,issue_00096,issue_00096))
 
 #issue_00098
 $(eval $(call template,issue_00098,issue_00098))
@@ -114,5 +99,140 @@ $(eval $(call template,issue_00102,issue_00102))
 #issue_00111
 $(eval $(call template,issue_00111,issue_00111))
 
+#issue_00114
+$(eval $(call template,issue_00114,issue_00114))
+
+#issue_00126
+$(eval $(call template,issue_00126,issue_00126))
+
+#issue_00128
+$(eval $(call template,issue_00128,issue_00128))
+
+#issue_00132
+$(eval $(call template,issue_00132,issue_00132))
+
+#issue_00133
+$(eval $(call template,issue_00133,issue_00133))
+
+#issue_00134
+$(eval $(call template,issue_00134,issue_00134))
+
+#issue_00160
+$(eval $(call template,issue_00160,issue_00160))
+
+#issue_00171
+$(eval $(call template,issue_00171,issue_00171))
+
+#issue_00173
+$(eval $(call template,issue_00173,issue_00173))
+
+#issue_00174
+$(eval $(call template,issue_00174,issue_00174))
+
+#issue_00175
+$(eval $(call template,issue_00175,issue_00175))
+
+#issue_00182
+$(eval $(call template,issue_00182,issue_00182))
+
+#issue_00183
+$(eval $(call template,issue_00183,issue_00183))
+
+#issue_00186
+$(eval $(call template,issue_00186,issue_00186))
+
+#issue_00194
+$(eval $(call template,issue_00194,issue_00194))
+
+#issue_00195
+$(eval $(call template,issue_00195,issue_00195))
+
+#issue_00196
+$(eval $(call template,issue_00196,issue_00196))
+
+#issue_00210
+$(eval $(call template,issue_00210,issue_00210))
+
+#issue_00253
+$(eval $(call template,issue_00253,issue_00253))
+
+#issue_00282
+$(eval $(call template,issue_00282,issue_00282))
+
+#issue_00283
+$(eval $(call template,issue_00283,issue_00283))
+
+#issue_00287
+$(eval $(call template,issue_00287,issue_00287))
+
+#issue_00289
+$(eval $(call template,issue_00289,issue_00289))
+
+#issue_00291
+$(eval $(call template,issue_00291,issue_00291))
+
+#issue_00300
+$(eval $(call template,issue_00300,issue_00300))
+
+#issue_00306
+$(eval $(call template,issue_00306,issue_00306))
+
+#issue_00314
+$(eval $(call template,issue_00314,issue_00314))
+
+#issue_00317
+$(eval $(call template,issue_00317,issue_00317))
+
+#issue_00341
+$(eval $(call template,issue_00341,issue_00341))
+
+#issue_00342
+$(eval $(call template,issue_00342,issue_00342))
+
+#issue_00349
+$(eval $(call template,issue_00349,issue_00349))
+
+#issue_00350
+$(eval $(call template,issue_00350,issue_00350))
+
+#issue_00361
+$(eval $(call template,issue_00361,issue_00361))
+
+#issue_00362
+$(eval $(call template,issue_00362,issue_00362))
+
+#issue_00372
+$(eval $(call template,issue_00372,issue_00372))
+
+#issue_00391
+$(eval $(call template,issue_00391,issue_00391))
+
+#issue_00432
+$(eval $(call template,issue_00432,issue_00432))
+
+#issue_00444
+$(eval $(call template,issue_00444,issue_00444))
+
+#issue_00449
+$(eval $(call template,issue_00449,issue_00449))
+
+#issue_00457
+$(eval $(call template,issue_00457,issue_00457))
+
+#issue_00474
+$(eval $(call template,issue_00474,issue_00474))
+
+#issue_00481
+$(eval $(call template,issue_00481,issue_00481))
+
+#issue_00502
+$(eval $(call template,issue_00502,issue_00502))
+
+#issue_00524
+$(eval $(call template,issue_00524,issue_00524))
+
+#issue_00527
+$(eval $(call template,issue_00527,issue_00527))
+
 
 .PHONY: all clean

regression/common.v

 module assert_dff(input clk, input test, input pat);
     always @(posedge clk)
     begin
+		#2
         if (test != pat)
         begin
             $display("ERROR: ASSERTION FAILED in %m:",$time);
             $stop;
         end
     end
-endmodule 
+endmodule
 
 module assert_tri(input en, input A, input B);
     always @(posedge en)
@@ -33,6 +34,18 @@ module assert_Z(input clk, input A);
     end
 endmodule
 
+module assert_X(input clk, input A);
+    always @(posedge clk)
+    begin
+        //#1;
+        if (A === 1'bX)
+        begin
+            $display("ERROR: ASSERTION FAILED in %m:",$time," ",A);
+            $stop;
+        end
+    end
+endmodule
+
 module assert_comb(input A, input B);
     always @(*)
     begin

regression/issue_00111/testbench.v

@@ -21,13 +21,13 @@ module testbench;
     begin
 		state = state + 2300;
 		key = key + 2500;
-	end
+	end*/
 
     top uut (
         .state (state ),
         .key (key ),
         .out (out )
-    );*/
+    );
 
     /*genvar index;
 	generate

regression/issue_00114/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+    top uut (
+        .clock (clk )
+    );
+endmodule

regression/issue_00114/top.v

+module top(
+  input wire clock
+);
+
+localparam COUNT = 1600;
+
+reg buffer[0:COUNT-1];
+
+always @(posedge clock) begin : GENERATE
+  integer ii;
+
+  for(ii = 0; ii < COUNT; ii = ii + 1) begin
+    buffer[ii] <= 1'b0;
+  end
+end
+
+endmodule

regression/issue_00126/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+    reg [1:0] in = 0;
+    always @(posedge clk)
+		in = in + 1;
+
+    top uut (
+        .in_a(in),
+        .out_vt(out)
+    );
+endmodule

regression/issue_00126/top.v

+module top (in_a, out_vt);
+
+input [1:0] in_a;
+output out_vt;
+reg   [2:0] result;
+assign out_vt = result;
+
+always @(*)
+  begin
+     result    = 3'b000;
+     case (in_a)
+       2'b00 : begin
+          result = 3'b101;
+       end
+
+       2'b01: begin
+          result    = 3'b001;
+       end
+
+       default;
+
+     endcase
+  end
+endmodule

regression/issue_00128/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+
+    top uut (
+        .b (clk )
+    );
+
+endmodule

regression/issue_00128/top.v

+module top(b);
+input b;
+initial $display("%m");
+endmodule
+

regression/issue_00132/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+    reg [7:0] a = 0;
+    wire [7:0] y;
+
+    always @(posedge clk)
+    begin
+		a = a + 3;
+	end
+
+    top uut (
+        .a (a ),
+        .y (y )
+    );
+
+    genvar index;
+	generate
+	for (index=0; index <= 7; index=index+1)
+	begin: gen_code_label
+		assert_Z check_output(clk,y[index]);
+	end
+	endgenerate
+
+endmodule

regression/issue_00132/top.v

+module submod(input [7:0] a, output [7:0] y);
+  parameter integer increment = 0;
+  initial begin
+    if (increment == 0) begin
+      $display("increment parameter must have a non-zero value!");
+      //$stop;
+    end
+  end
+  assign y = a + increment;
+endmodule
+
+module top(input [7:0] a, output [7:0] y);
+  parameter integer incr = 0;
+  submod #(incr) submod_instance (a, y);
+endmodule

regression/issue_00133/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+    reg [7:0] a = 0;
+    wire [7:0] y;
+
+    always @(posedge clk)
+    begin
+		a = a + 3;
+	end
+
+    top uut (
+        .a (a ),
+        .y (y )
+    );
+
+    genvar index;
+	generate
+	for (index=0; index <= 7; index=index+1)
+	begin: gen_code_label
+		assert_Z check_output(clk,y[index]);
+	end
+	endgenerate
+
+endmodule

regression/issue_00133/top.v

+module top(input [7:0] a, output reg [7:0] y);
+  always @* begin:myblock
+    reg [7:0] myarray [0:1];
+    myarray[0] = a + 23;
+    myarray[1] = myarray[0] - 42;
+    y = myarray[1] + 19;
+  end
+endmodule

regression/issue_00134/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+    reg [15:0] a = 0;
+    wire [15:0] y;
+
+    always @(posedge clk)
+    begin
+		a = a + 3;
+	end
+
+    top uut (
+        .in_data (a ),
+        .do (y )
+    );
+
+    genvar index;
+	generate
+	for (index=0; index <= 15; index=index+1)
+	begin: gen_code_label
+		assert_X check_output(clk,y[index]);
+	end
+	endgenerate
+
+endmodule

regression/issue_00134/top.v

+module top ( in_data, do );
+
+   input [15:0] in_data;
+   output [15:0]  do;
+   wire [15:0] out_data;
+
+   assign do = out_data;
+
+   always @ (*)
+     begin
+
+    Test_task(in_data, out_data);
+         // out_data = in_data; // This works but above task doesn't
+
+     end
+
+   task Test_task;
+      input [15:0]  in_d;
+      output [15:0] out_data;
+
+      begin
+        out_data = in_d;
+      end
+   endtask
+
+endmodule

regression/issue_00160/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+    reg a = 0;
+    reg ce = 1;
+    wire d;
+
+    always @(posedge clk)
+    begin
+		a = a + 1;
+	end
+
+	top uut (
+        .CLKIN(clk),
+        .A (a ),
+        .CE (ce),
+        .D1 (d)
+    );
+
+		assert_X check_output(clk,d);
+
+endmodule

regression/issue_00160/top.v

+module Add2 (input [1:0] I0, input [1:0] I1, output [1:0] O);
+wire  inst0_O;
+wire  inst1_CO;
+wire  inst2_O;
+wire  inst3_CO;
+SB_LUT4 #(.LUT_INIT(16'hC33C)) inst0 (.I0(1'b0), .I1(I0[0]), .I2(I1[0]), .I3(1'b0), .O(inst0_O));
+SB_CARRY inst1 (.I0(I0[0]), .I1(I1[0]), .CI(1'b0), .CO(inst1_CO));
+SB_LUT4 #(.LUT_INIT(16'hC33C)) inst2 (.I0(1'b0), .I1(I0[1]), .I2(I1[1]), .I3(inst1_CO), .O(inst2_O));
+SB_CARRY inst3 (.I0(I0[1]), .I1(I1[1]), .CI(inst1_CO), .CO(inst3_CO));
+assign O = {inst2_O,inst0_O};
+endmodule
+
+module Register2CE (input [1:0] I, output [1:0] O, input  CLK, input  CE);
+wire  inst0_Q;
+wire  inst1_Q;
+//SB_DFFE #(.INIT(1'b0)) inst0 (.C(CLK), .E(CE), .D(I[0]), .Q(inst0_Q));
+//SB_DFFE #(.INIT(1'b0)) inst1 (.C(CLK), .E(CE), .D(I[1]), .Q(inst1_Q));
+SB_DFFE  inst0 (.C(CLK), .E(CE), .D(I[0]), .Q(inst0_Q));
+SB_DFFE  inst1 (.C(CLK), .E(CE), .D(I[1]), .Q(inst1_Q));
+assign O = {inst1_Q,inst0_Q};
+endmodule
+
+module top (input  CLKIN, input  A, input  CE, output  D1);
+wire [1:0] inst0_O;
+wire [1:0] inst1_O;
+Add2 inst0 (.I0(inst1_O), .I1({1'b0,1'b1}), .O(inst0_O));
+Register2CE inst1 (.I(inst0_O), .O(inst1_O), .CLK(CLKIN), .CE(CE));
+assign D1 = inst1_O[1];
+endmodule

regression/issue_00171/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+    reg rst = 1;
+    reg ce = 1;
+    wire [3:0] count;
+    reg [3:0] count_p;
+
+	always @(posedge clk)
+    begin
+		rst = 0;
+	end
+
+	always @(posedge clk)
+      if (rst)
+         count_p <= 4'd0;
+      else if (ce)
+         count_p <= count_p + 4'd1;
+
+	top uut (
+        .clk(clk),
+        .rst (rst ),
+        .en (ce),
+        .count (count)
+    );
+
+	genvar index;
+	generate
+	for (index=0; index <= 3; index=index+1)
+	begin: gen_code_label
+		assert_dff check_output(clk,count[index],count_p[index]);
+	end
+	endgenerate
+
+endmodule

regression/issue_00171/top.v

+module top (clk, rst, en, count);
+   input clk, rst, en;
+   output reg [3:0] count;
+   always @(posedge clk)
+      if (rst)
+         count <= 4'd0;
+      else if (en)
+         count <= count + 4'd1;
+endmodule

regression/issue_00173/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+    wire [2:0] o;
+    reg [2:0] i;
+
+
+	always @(posedge clk)
+         i <= i + 1;
+
+	top uut (i[0],i[1],i[2],o[0],o[1],o[2]);
+
+	genvar index;
+	generate
+	for (index=0; index <= 2; index=index+1)
+	begin: gen_code_label
+		assert_dff check_output(clk,o[index],i[index]);
+	end
+	endgenerate
+
+endmodule

regression/issue_00173/top.v

+module top
+(
+   input ai, bi, ci,
+   output reg ao, bo, co
+);
+   always@*
+   begin
+      ao=ai;
+      bo=bi;
+      co=ci;
+      {co,co,bo,ao} = {ai,bi,ai,ci}; // Error: multiple assignment to 'co' with blocking assignment
+   end
+
+endmodule

regression/issue_00174/abc.rc

+# global parameters
+set check         # checks intermediate networks
+#set checkfio      # prints warnings when fanins/fanouts are duplicated
+set checkread     # checks new networks after reading from file
+set backup        # saves backup networks retrived by "undo" and "recall"
+set savesteps 1   # sets the maximum number of backup networks to save 
+set progressbar   # display the progress bar
+
+# program names for internal calls
+set dotwin dot.exe
+set dotunix dot
+set gsviewwin gsview32.exe
+set gsviewunix gv
+set siswin sis.exe
+set sisunix sis
+set mvsiswin mvsis.exe
+set mvsisunix mvsis
+set capowin MetaPl-Capo10.1-Win32.exe
+set capounix MetaPl-Capo10.1
+set gnuplotwin wgnuplot.exe
+set gnuplotunix gnuplot
+
+# standard aliases
+alias b balance
+alias cl cleanup
+alias clp collapse
+alias esd ext_seq_dcs
+alias f fraig
+alias fs fraig_sweep
+alias fsto fraig_store
+alias fres fraig_restore
+alias ft fraig_trust
+alias lp lutpack
+alias pd print_dsd
+alias pex print_exdc -d
+alias pf print_factor
+alias pfan print_fanio
+alias pl print_level
+alias pio print_io
+alias pk print_kmap
+alias ps print_stats 
+alias psu print_supp
+alias psy print_symm
+alias pun print_unate
+alias q quit
+alias r read
+alias r3 retime -M 3
+alias r3f retime -M 3 -f
+alias r3b retime -M 3 -b
+alias ren renode
+alias rh read_hie
+alias rl read_blif
+alias rb read_bench
+alias ret retime
+alias rp read_pla
+alias rt read_truth
+alias rv read_verilog
+alias rvl read_verlib
+alias rsup read_super mcnc5_old.super
+alias rlib read_library
+alias rlibc read_library cadence.genlib
+alias rw rewrite
+alias rwz rewrite -z
+alias rf refactor
+alias rfz refactor -z
+alias re restructure
+alias rez restructure -z
+alias rs resub
+alias rsz resub -z
+alias sa set autoexec ps
+alias scl scleanup
+alias sif if -s
+alias so source -x
+alias st strash
+alias sw sweep
+alias ssw ssweep
+alias tr0 trace_start
+alias tr1 trace_check
+alias trt "r c.blif; st; tr0; b; tr1"
+alias u undo
+alias w write
+alias wa write_aiger
+alias wb write_bench
+alias wc write_cnf
+alias wh write_hie
+alias wl write_blif
+alias wp write_pla
+alias wv write_verilog
+
+# standard scripts
+alias share       "b; ren -s; fx; b"
+alias sharedsd    "b; ren -b; dsd -g; sw; fx; b"
+alias resyn       "b; rw; rwz; b; rwz; b"
+alias resyn2      "b; rw; rf; b; rw; rwz; b; rfz; rwz; b"
+alias resyn2a     "b; rw; b; rw; rwz; b; rwz; b"
+alias resyn3      "b; rs; rs -K 6; b; rsz; rsz -K 6; b; rsz -K 5; b"
+alias compress    "b -l; rw -l; rwz -l; b -l; rwz -l; b -l"
+alias compress2   "b -l; rw -l; rf -l; b -l; rw -l; rwz -l; b -l; rfz -l; rwz -l; b -l"
+alias choice      "fraig_store; resyn; fraig_store; resyn2; fraig_store; fraig_restore"
+alias choice2     "fraig_store; balance; fraig_store; resyn; fraig_store; resyn2; fraig_store; resyn2; fraig_store; fraig_restore"
+alias rwsat       "st; rw -l; b -l; rw -l; rf -l"
+alias rwsat2      "st; rw -l; b -l; rw -l; rf -l; fraig; rw -l; b -l; rw -l; rf -l"
+alias shake       "st; ps; sat -C 5000; rw -l; ps; sat -C 5000; b -l; rf -l; ps; sat -C 5000; rfz -l; ps; sat -C 5000; rwz -l; ps; sat -C 5000; rfz -l; ps; sat -C 5000"
+
+# resubstitution scripts for the IWLS paper
+alias src_rw      "st; rw -l; rwz -l; rwz -l" 
+alias src_rs      "st; rs -K 6 -N 2 -l; rs -K 9 -N 2 -l; rs -K 12 -N 2 -l" 
+alias src_rws     "st; rw -l; rs -K 6 -N 2 -l; rwz -l; rs -K 9 -N 2 -l; rwz -l; rs -K 12 -N 2 -l" 
+alias resyn2rs    "b; rs -K 6; rw; rs -K 6 -N 2; rf; rs -K 8; b; rs -K 8 -N 2; rw; rs -K 10; rwz; rs -K 10 -N 2; b; rs -K 12; rfz; rs -K 12 -N 2; rwz; b"
+alias compress2rs "b -l; rs -K 6 -l; rw -l; rs -K 6 -N 2 -l; rf -l; rs -K 8 -l; b -l; rs -K 8 -N 2 -l; rw -l; rs -K 10 -l; rwz -l; rs -K 10 -N 2 -l; b -l; rs -K 12 -l; rfz -l; rs -K 12 -N 2 -l; rwz -l; b -l"
+
+# experimental implementation of don't-cares
+alias resyn2rsdc    "b; rs -K 6 -F 2; rw; rs -K 6 -N 2 -F 2; rf; rs -K 8 -F 2; b; rs -K 8 -N 2 -F 2; rw; rs -K 10 -F 2; rwz; rs -K 10 -N 2 -F 2; b; rs -K 12 -F 2; rfz; rs -K 12 -N 2 -F 2; rwz; b"
+alias compress2rsdc "b -l; rs -K 6 -F 2 -l; rw -l; rs -K 6 -N 2 -F 2 -l; rf -l; rs -K 8 -F 2 -l; b -l; rs -K 8 -N 2 -F 2 -l; rw -l; rs -K 10 -F 2 -l; rwz -l; rs -K 10 -N 2 -F 2 -l; b -l; rs -K 12 -F 2 -l; rfz -l; rs -K 12 -N 2 -F 2 -l; rwz -l; b -l"
+
+# minimizing for FF literals
+alias fflitmin    "compress2rs; ren; sop; ps -f"
+
+# temporaries
+#alias t        "rvl th/lib.v; rvv th/t2.v"
+#alias t        "so c/pure_sat/test.c"
+#alias t        "r c/14/csat_998.bench; st; ps"
+#alias t0        "r res.blif; aig; mfs"  
+#alias t        "r res2.blif; aig; mfs"  
+
+#alias tt       "r a/quip_opt/nut_001_opt.blif"
+#alias ttb      "wh a/quip_opt/nut_001_opt.blif 1.blif"
+#alias ttv      "wh a/quip_opt/nut_001_opt.blif 1.v"
+
+alias reach    "st; ps; compress2; ps; qrel; ps; compress2; ps; qreach -v; ps"
+
+alias qs1      "qvar -I 96 -u; ps; qbf -P 96" 
+alias qs2      "qvar -I 96 -u; qvar -I 97 -u; ps; qbf -P 96" 
+alias qs3      "qvar -I 96 -u; qvar -I 97 -u; qvar -I 98 -u; ps; qbf -P 96" 
+alias qs4      "qvar -I 96 -u; qvar -I 97 -u; qvar -I 98 -u; qvar -I 99 -u; ps; qbf -P 96" 
+alias qs5      "qvar -I 96 -u; qvar -I 97 -u; qvar -I 98 -u; qvar -I 99 -u; qvar -I 100 -u; ps; qbf -P 96" 
+alias qs6      "qvar -I 96 -u; qvar -I 97 -u; qvar -I 98 -u; qvar -I 99 -u; qvar -I 100 -u; qvar -I 101 -u; ps; qbf -P 96" 
+alias qs7      "qvar -I 96 -u; qvar -I 97 -u; qvar -I 98 -u; qvar -I 99 -u; qvar -I 100 -u; qvar -I 101 -u; qvar -I 102 -u; ps; qbf -P 96" 
+alias qs8      "qvar -I 96 -u; qvar -I 97 -u; qvar -I 98 -u; qvar -I 99 -u; qvar -I 100 -u; qvar -I 101 -u; qvar -I 102 -u; qvar -I 103 -u; ps; qbf -P 96" 
+alias qs9      "qvar -I 96 -u; qvar -I 97 -u; qvar -I 98 -u; qvar -I 99 -u; qvar -I 100 -u; qvar -I 101 -u; qvar -I 102 -u; qvar -I 103 -u; qvar -I 104 -u; ps; qbf -P 96" 
+alias qsA      "qvar -I 96 -u; qvar -I 97 -u; qvar -I 98 -u; qvar -I 99 -u; qvar -I 100 -u; qvar -I 101 -u; qvar -I 102 -u; qvar -I 103 -u; qvar -I 104 -u; qvar -I 105 -u; ps; qbf -P 96" 
+
+alias chnew    "st; haig_start; resyn2; haig_use"
+alias chnewrs  "st; haig_start; resyn2rs; haig_use"
+
+alias stdsd    "r test/6in.blif; st; ps; u; bdd; dsd -g; st; ps"
+alias trec     "rec_start; r c.blif; st; rec_add; rec_use"
+alias trec4    "rec_start -K 4; r i10.blif; st; rec_add; rec_use"
+alias trec5    "rec_start -K 5; r i10.blif; st; rec_add; rec_use"
+alias trec6    "rec_start -K 6; r i10.blif; st; rec_add; rec_use"
+alias trec7    "rec_start -K 7; r i10.blif; st; rec_add; rec_use"
+alias trec8    "rec_start -K 8; r i10.blif; st; rec_add; rec_use"
+alias trec10   "rec_start -K 10; r i10.blif; st; rec_add; rec_use"
+alias trec12   "rec_start -K 12; r i10.blif; st; rec_add; rec_use"
+
+#alias tsh      "r i10_if.blif; st; ps; u; sw; st; ps; cec"
+alias tst4     "r i10_if4.blif; st; ps; r x/rec4_.blif; st; rec_start; r i10_if4.blif; st -r; ps; cec"
+alias tst4n    "r i10_if4.blif; st; ps; r 5npn/all_functions.aig; st; rec_start; r i10_if4.blif; st -r; ps; cec"
+alias tst6     "r i10_if6.blif; st; ps; r x/rec6_16_.blif; st; rec_start; r i10_if6.blif; st -r; ps; cec"
+
+#alias t        "r c.blif; st; wc c.cnf"
+#alias t        "r test/dsdmap6.blif; lutpack -vw; cec"
+#alias t        "r i10_if4.blif; lp"
+#alias t1        "r pj1_if4.blif; lp"
+#alias t2        "r pj1_if6.blif; lp"
+#alias t        "r pj/pj1.blif; st; dfraig -v"
+#alias t        "r c/16/csat_2.bench; st; dfraig -C 100 -v -r"
+#alias t        "r c/16/csat_147.bench; st; dfraig -C 10 -v -r"
+#alias t        "r i10.blif; st; ps; csweep; ps; cec"
+#alias t        "r c/5/csat_777.bench; st; csweep -v"
+#alias t        "r i10.blif; st; drw -v"
+alias t        "r c.blif; st; drf"
+
+

regression/issue_00174/abc.tcl

+source abc.rc;
+print_lut;
+resyn;

regression/issue_00174/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+    wire [5:0] o;
+    reg [5:0] i;
+    wire [5:0] wave_out;
+
+
+	always @(posedge clk)
+         i <= i + 1;
+
+    wire [31:0] w = 1-i;
+	assign wave_out = w/2;
+
+	top uut (i,o);
+
+	genvar index;
+	generate
+	for (index=0; index <= 2; index=index+1)
+	begin: gen_code_label
+		assert_dff check_output(clk,o[index],wave_out[index]);
+	end
+	endgenerate
+
+endmodule

regression/issue_00174/top.v

+module top
+(
+   input [5:0] ptr,
+   output [5:0] wave_out
+);
+   wire [31:0] w = 1-ptr;
+   assign wave_out = w/2;
+endmodule

regression/issue_00175/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+
+    wire GC;
+    wire GC_p;
+    reg  E = 0;
+
+    always @(posedge clk)
+		E = ~E;
+
+    reg ED;
+
+	always@(*) begin
+		if(~clk)
+			ED = E;
+	end
+
+    assign GC_p = clk & ED;
+
+	top uut (clk,CG,E);
+
+	assert_dff check_output(clk,GC,GC_p);
+
+endmodule

regression/issue_00175/top.v

+module top (
+    C,
+    GC,
+    E
+);
+
+    input  C;
+    output GC;
+    input  E;
+
+    reg ED;
+
+always@(*) begin
+    if(~C)
+        ED = E;
+end
+
+    assign GC = C & ED;
+
+endmodule

regression/issue_00182/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+endmodule

regression/issue_00183/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+        //$dumpfile("testbench.vcd");
+        //$dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+    wire out;
+
+    top uut (clk,out);
+
+    assert_dff check_output (clk,out,1'b1);
+
+endmodule

regression/issue_00183/top.v

+module top(input in,output out);
+  SB_DFF dff(out,in,1);
+endmodule

regression/issue_00186/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+        //$dumpfile("testbench.vcd");
+        //$dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+
+   reg [1:0] adr = 0;
+   reg [1:0] din = 0;
+   wire [1:0] q;
+   reg mem_init = 0;
+
+   always @(posedge clk) begin
+    #3;
+    din <= din + 1;
+    adr <= adr + 1;
+    end
+
+    always @(posedge adr) begin
+    #10;
+        if(adr == 2'b11)
+            mem_init <= 1;
+    end
+
+    top uut (adr,clk,din,q);
+
+    uut_mem_checker port_b_test(.clk(clk), .init(mem_init), .A(q));
+
+endmodule
+
+module uut_mem_checker(input clk, input init, input [1:0] A);
+    always @(posedge clk)
+    begin
+        #1;
+        if (init == 1 & A === 2'bXX)
+        begin
+            $display("ERROR: ASSERTION FAILED in %m:",$time," ",A);
+            $stop;
+        end
+    end
+endmodule

regression/issue_00186/top.v

+`define TEST_1
+module top (
+   input [1:0] adr,
+   input clk,
+   input [1:0] din,
+   output reg [1:0] q
+);
+   reg [1:0] ram [3:0];
+   always@(posedge clk)
+   begin
+`ifdef TEST_1
+     {ram[adr],q} <= {din, ram[adr]};
+`elsif TEST_2
+      ram[adr] <= din;
+      q <= ram[adr];
+`endif
+   end
+endmodule

regression/issue_00194/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+        //$dumpfile("testbench.vcd");
+        //$dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+    wire out;
+
+    top uut (clk,out);
+
+    assert_dff check_output (clk,out,1'b1);
+
+endmodule

regression/issue_00194/top.v

+module top(input a, output y);
+  demo_sub sub (y, , 1'b1, a);
+endmodule
+
+module demo_sub(output y, z, input a, b);
+  assign y = a & b, z = a | b;
+endmodule

regression/issue_00195/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+
+    top uut (
+        .b (clk )
+    );
+
+endmodule

regression/issue_00195/top.v

+module top(b);
+input b;
+wire a = 100_000.0;
+endmodule
+

regression/issue_00196/testbench.v

+`timescale 1ns/1ps
+
+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+    wire a,b,c,d,e,f;
+
+    top uut(clk,a,b,c,d,e,f);
+
+endmodule

regression/issue_00196/top.v

+module top(p1h, p1l, p2h, p2l, p3h, p3l);
+
+    (* LOC="P3" *) output p1h;
+    (* LOC="P4" *) output p1l;
+    (* LOC="P5" *) output p2h;
+    (* LOC="P6" *) output p2l;
+    (* LOC="P7" *) output p3h;
+    (* LOC="P8" *) output p3l;
+
+    wire clk;
+    GP_LFOSC #(
+        .AUTO_PWRDN(0),
+        .OUT_DIV(1)
+    ) osc (
+        .CLKOUT(clk)
+    );
+
+    localparam DIVIDER = 1;//400;
+    reg [13:0] divcnt = DIVIDER;
+    always @(posedge clk)
+        if(divcnt == 0)
+            divcnt <= DIVIDER;
+        else
+            divcnt <= divcnt - 1;
+
+    wire reset;
+    GP_POR por(
+        .RST_DONE(reset)
+    );
+
+    reg  [2:0] state;
+    always @(posedge divcnt or negedge reset)
+        if(!reset)
+            state <= 0;
+        else
+            case(state)
+                0: state <= 1;
+                1: state <= 2;
+                2: state <= 3;
+                3: state <= 4;
+                4: state <= 5;
+                5: state <= 0;
+            endcase
+
+    reg  [5:0] phases;
+    always @(*) begin
+        phases <= 6'b000000;
+        case(state)
+            0: phases <= 6'b100100;
+            1: phases <= 6'b000110;
+            2: phases <= 6'b010010;
+            3: phases <= 6'b011000;
+            4: phases <= 6'b001001;
+            5: phases <= 6'b100001;
+        endcase
+    end
+
+    wire p1i, p2i, p3i;
+    assign {p1i, p1l, p2i, p2l, p3i, p3l} = phases;
+    assign {p1h, p2h, p3h} = ~{p1i, p2i, p3i};
+
+endmodule

regression/issue_00210/testbench.v

+`timescale 1ns/1ps
+
+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+    wire [9:0] a;
+
+    top uut(a);
+
+endmodule

regression/issue_00210/top.v

+module top(result);
+  output signed [9:0] result;
+
+  wire signed [9:0] intermediate [0:2];
+
+  function integer depth2Index;
+    input integer depth;
+
+    depth2Index = depth;
+  endfunction
+
+  assign intermediate[depth2Index(2)] = 0;
+  assign result = intermediate[2];
+endmodule

regression/issue_00253/testbench.v

+`timescale 1ns/1ps
+
+module testbench;
+    reg clk;
+
+    initial begin
+        // $dumpfile("testbench.vcd");
+        // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+    reg [3:0] in = 2;
+    reg [1:0] count = 0;
+    reg init = 0;
+    wire [7:0] out;
+
+    always @(posedge clk)
+    begin
+		in = in + 7;
+		count = count + 1;
+		if (count == 2'b11)
+			init = 1;
+	end
+
+    top uut(clk,in,out);
+
+    genvar index;
+	generate
+	for (index=0; index <= 7; index=index+1)
+	begin: gen_code_label
+		check_X check_output(clk,init,out[index]);
+	end
+	endgenerate
+
+endmodule
+
+module check_X(input clk,input init, input A);
+    always @(posedge clk)
+    begin
+        #1;
+        if (A === 1'bX && init == 1'b1)
+        begin
+            $display("ERROR: ASSERTION FAILED in %m:",$time," ",A);
+            $stop;
+        end
+    end
+endmodule

regression/issue_00282/testbench.v

+`timescale 1ns/1ps
+
+module testbench;
+    reg clk;
+
+    initial begin
+        // $dumpfile("testbench.vcd");
+        // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+    reg [3:0] in = 2;
+    reg [1:0] count = 0;
+    reg init = 0;
+    wire [7:0] out;
+
+    always @(posedge clk)
+    begin
+		in = in + 7;
+		count = count + 1;
+		if (count == 2'b11)
+			init = 1;
+	end
+
+    top uut(clk,in,out);
+
+    genvar index;
+	generate
+	for (index=0; index <= 7; index=index+1)
+	begin: gen_code_label
+		check_X check_output(clk,init,out[index]);
+	end
+	endgenerate
+
+endmodule
+
+module check_X(input clk,input init, input A);
+    always @(posedge clk)
+    begin
+        #1;
+        if (A === 1'bX && init == 1'b1)
+        begin
+            $display("ERROR: ASSERTION FAILED in %m:",$time," ",A);
+            $stop;
+        end
+    end
+endmodule

regression/issue_00283/testbench.v

+`timescale 1ns/1ps
+
+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+    wire y;
+
+    top uut(clk,1'b1,y);
+
+    assert_X check_output(clk,y);
+
+endmodule

regression/issue_00283/top.v

+module top(input clk, enable, output reg y);
+
+wire [1:0] foo [1:0];
+integer i;
+initial begin
+  for (i=0;i<=1;i=i+1)
+    foo[i] = 2'b11;
+end
+
+always @(posedge clk)
+    if (enable)
+        for (i = 0; i < 2; i=i+1)
+            y <= foo[0][0];
+
+endmodule

regression/issue_00287/testbench.v

+`timescale 1ns/1ps
+
+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+    reg [6:0] D = 0;
+    reg [1:0] S = 0;
+    wire [1:0] Y;
+	reg [1:0] Y_p;
+
+    always @(posedge clk)
+    begin
+		D = D + 3;
+		S = S + 1;
+    end
+
+    always @* begin : block
+		reg [3:0] data [0:3];
+		data[0] = D[3:0];
+		data[1] = D[4:1];
+		data[2] = D[5:2];
+		data[3] = D[6:3];
+		Y_p = data[S];
+	end
+
+    top uut(D,S,Y);
+
+    assert_dff check_Y0 (clk,Y[0],Y_p[0]);
+    assert_dff check_Y1 (clk,Y[1],Y_p[1]);
+
+endmodule

regression/issue_00287/top.v

+module top(input [6:0] D, input [1:0] S, output reg [1:0] Y);
+  always @* begin : block
+    reg [3:0] data [0:3];
+    data[0] = D[3:0];
+    data[1] = D[4:1];
+    data[2] = D[5:2];
+    data[3] = D[6:3];
+    Y = data[S];
+  end
+endmodule

regression/issue_00289/testbench.v

+`timescale 1ns/1ps
+
+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+    wire o;
+
+
+    top uut(clk,o);
+
+    assert_dff check_o (clk,clk,o);
+
+endmodule

regression/issue_00289/top.v

+function f(input i);
+reg [1:0] mem0 [1:0];
+f = i;
+endfunction
+
+module top(in,out);
+input in;
+output out;
+assign out = f(in);
+endmodule

regression/issue_00291/testbench.v

+`timescale 1ns/1ps
+
+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+    reg rst = 0;
+    reg any_pop = 0;
+    reg any_push = 0;
+
+    always @(posedge clk)
+    begin
+		rst = 1;
+		#1
+		any_pop = ~any_pop;
+		#3
+		any_push = ~any_push;
+    end
+
+
+
+    top uut(rst,clk,any_push,any_pop);
+
+endmodule

regression/issue_00291/top.v

+module top (
+input reset,
+input clk,
+input any_push,
+input any_pop
+);
+reg [1:0] fifo_head [3:0];
+reg [1:0] fifo_next [3:0];
+wire [1:0] fifo_head4samp [3:0];
+genvar fifo_num ;
+integer pntr_num,fifoifo_num;
+
+generate
+for (fifo_num=0; fifo_num<4; fifo_num=fifo_num+1) begin:fifo_gen
+assign fifo_head4samp[fifo_num] = fifo_next[fifo_head[fifo_num]] ; /* this is line 16 */
+end
+endgenerate
+
+always @(posedge clk or negedge reset)
+begin
+if (!reset) begin
+for (pntr_num=0; pntr_num<4; pntr_num=pntr_num+1)
+fifo_next[pntr_num] <= {2{1'b0}} ;
+end
+else if (any_push | any_pop) begin
+for (fifoifo_num=0; fifoifo_num<4; fifoifo_num=fifoifo_num+1) begin
+fifo_head[fifoifo_num] <= fifo_head4samp[fifoifo_num] ;
+end
+end
+end
+
+endmodule

regression/issue_00300/testbench.v

+`timescale 1ns/1ps
+
+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+	reg [7:0] addr = 0;
+	reg [7:0] wdata = 0;
+	wire [7:0] rdata;
+	wire [7:0] rdata_o;
+
+	always @(posedge clk)
+	begin
+		addr = addr + 1;
+		wdata = wdata + 17;
+	end
+
+	reg [7:0] memory [255:0];
+	assign rdata = memory[addr];
+	always @(posedge clk) memory[addr] <= wdata;
+
+
+
+    top uut(clk,addr,wdata,rdata_o);
+
+	uut_mem_checker port_b_test(.clk(clk), .A(rdata), .B(rdata_o));
+
+endmodule
+
+module uut_mem_checker(input clk, input [7:0] A, input [7:0] B);
+    always @(posedge clk)
+    begin
+        #1;
+        if (A == B)
+        begin
+            $display("ERROR: ASSERTION FAILED in %m:",$time,"      ",A," != ",B);
+            $stop;
+        end
+    end
+endmodule

regression/issue_00300/top.v

+module top(input clk, input [7:0] addr, wdata, output [7:0] rdata);
+reg [7:0] memory [255:0];
+assign rdata = memory[addr];
+always @(posedge clk) memory[addr] <= wdata;
+endmodule

regression/issue_00306/testbench.v

+`timescale 1ns/1ps
+
+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+	reg [3:0] a = 0;
+	wire res_p;
+	wire res;
+
+	always @(posedge clk)
+	begin
+		a = a + 1;
+	end
+
+	assign res_p = a < 6'b100000;
+
+    top uut(a,res);
+
+	assert_dff check_res (clk,res, res_p);
+
+endmodule

regression/issue_00306/top.v

+module top (input [3:0] a, output res);
+    assign res = a < 6'b100000;
+endmodule

regression/issue_00314/testbench.v

+`timescale 1ns/1ps
+
+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+	reg [7:0] a = 0;
+	reg [7:0] b = 0;
+	wire [7:0] z;
+
+	always @(posedge clk)
+	begin
+		a = a + 1;
+		b = b + 7;
+	end
+
+    top uut(a,b,z);
+
+	genvar index;
+	generate
+	for (index=0; index <= 7; index=index+1)
+	begin: gen_code_label
+		assert_Z check_output(clk,z[index]);
+	end
+	endgenerate
+
+endmodule

regression/issue_00314/top.v

+module top(a,b,z);
+    parameter width_a = 8;
+    parameter width_b = 8;
+    input [width_a-1:0] a;
+    input [width_b-1:0] b;
+    output [width_a-1:0] z;
+    reg  [width_a-1:0] z;
+
+    always@(a or b)
+    begin
+        div_u(a,b,z);
+    end
+
+    function [width_b:0] minus;
+        input [width_b:0] in1;
+        input [width_b:0] in2;
+        minus = in1 - in2;
+    endfunction
+
+    task divmod;
+        input [width_a-1:0] l;
+        input [width_b-1:0] r;
+        output [width_a-1:0] rdiv;
+        output [width_b-1:0] rmod;
+
+        parameter llen = width_a;
+        parameter rlen = width_b;
+        reg [(llen+rlen)-1:0] lbuf;
+        reg [rlen:0] diff;
+        integer i;
+        begin
+            lbuf = 0;
+            lbuf[llen-1:0] = l;
+            for(i=width_a-1;i>=0;i=i-1)
+            begin
+                diff = minus(lbuf[(llen+rlen)-1:llen-1], {1'b0,r});
+                rdiv[i] = ~diff[rlen];
+                if(diff[rlen] == 0)
+                    lbuf[(llen+rlen)-1:llen-1] = diff;
+                lbuf[(llen+rlen)-1:1] = lbuf[(llen+rlen)-2:0];
+            end
+        rmod = lbuf[(llen+rlen)-1:llen];
+        end
+    endtask
+
+    task div_u;
+        input [width_a-1:0] l;
+        input [width_b-1:0] r;
+        output [width_a-1:0] rdiv;
+
+        reg [width_a-01:0] rdiv;    // <-- this line causes problem
+        reg [width_b-1:0] rmod;
+        begin
+            divmod(l, r, rdiv, rmod);
+        end
+    endtask
+
+endmodule

regression/issue_00317/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+	reg [7:0] in = 0;
+	wire [7:0] out;
+
+    always @(posedge clk) begin
+		in <= in + 1;
+    end
+
+    top uut (
+        .alu_data_d_in (in ),
+        .alu_data_d_out (out )
+    );
+
+
+	uut_checker q_test(.clk(clk), .A(out));
+
+endmodule
+
+module uut_checker(input clk, input [7:0] A);
+    always @(posedge clk)
+    begin
+        #1;
+        if (A === 8'bXXXXXXXX)
+        begin
+            $display("ERROR: ASSERTION FAILED in %m:",$time," ",A);
+            $stop;
+        end
+    end
+endmodule

regression/issue_00317/top.v

+module top(
+        alu_data_d_in,
+    alu_data_d_out
+    );
+
+    input [7:0]alu_data_d_in;
+    output[7:0]alu_data_d_out;
+    wire [7:0]swap_out;
+    genvar i;
+
+
+    generate
+        for ( i = 7 ; ( i >= 4 ) ; i-- )
+        begin : swap_h
+            assign swap_out[i] = alu_data_d_in[( ( i - 4 ) )];
+        end
+    endgenerate
+     generate
+         for ( i = 0 ; ( i <4 ) ; i++ )
+         begin : swap_l
+             assign swap_out[i] = alu_data_d_in[(i+4 )];
+         end
+     endgenerate
+
+assign alu_data_d_out = swap_out;
+
+endmodule

regression/issue_00341/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+
+
+	reg i1,i2 = 0;
+	wire o1g,o2g;
+	wire o1r,o2r;
+	wire o1w,o2w;
+	wire o1gt,o2gt;
+	wire o1rt,o2rt;
+	wire o1wt,o2wt;
+
+    always @(posedge clk) begin
+		i1 <= i1 + 1;
+		i2 <= i2 + 1;
+    end
+
+
+    gold uut_g (
+		i1,i2,o1g,o2g
+    );
+
+    top_r uut_r (
+		i1,i2,o1r,o2r
+    );
+
+    top_w uut_w (
+		i1,i2,o1w,o2w
+    );
+
+    goldt uut_gt (
+		i1,i2,o1gt,o2gt
+    );
+
+    top_rt uut_rt (
+		i1,i2,o1rt,o2rt
+    );
+
+    top_wt uut_wt (
+		i1,i2,o1wt,o2wt
+    );
+
+
+	assert_dff gold_test(clk,o1g,o1gt);
+	assert_dff top_r_test(clk,o1r,o1rt);
+	assert_dff top_w_test(clk,o1w,o1wt);
+endmodule
+
+module goldt(input i1, input i2, output o2, output o1);
+ wire _1_;
+ assign o2 = i1 & i2;
+ assign _1_ = i1 | i2;
+ assign o1 = _1_ & o2;
+endmodule
+
+module top_rt( i1, i2, o1, o2 );
+  input i1, i2;
+  output o1, o2;
+  wire w4;
+  assign o2 = (i2 & i1);
+  assign w4 = ((i2 && i1) | (i2) | (i1));
+  assign o1 = ((w4 & o2));
+endmodule
+
+module top_wt( i1, i2, o1, o2 );
+  input i1, i2;
+  output o1, o2;
+  wire w4;
+  assign o2 = (i2 & i1);
+  assign w4 = ((i2 & i1) | (i2) | (i1));
+  assign o1 = ((w4 & o2));
+endmodule

regression/issue_00341/top.v

+module gold(input i1, input i2, output o2, output o1);
+ wire _1_;
+ assign o2 = i1 & i2;
+ assign _1_ = i1 | i2;
+ assign o1 = _1_ & o2;
+endmodule
+
+module top_r( i1, i2, o1, o2 );
+  input i1, i2;
+  output o1, o2;
+  wire w4;
+  assign o2 = (i2 & i1);
+  assign w4 = ((i2 && i1) | (i2) | (i1));
+  assign o1 = ((w4 & o2));
+endmodule
+
+module top_w( i1, i2, o1, o2 );
+  input i1, i2;
+  output o1, o2;
+  wire w4;
+  assign o2 = (i2 & i1);
+  assign w4 = ((i2 & i1) | (i2) | (i1));
+  assign o1 = ((w4 & o2));
+endmodule

regression/issue_00342/testbench.v

+`timescale 1ns/1ps
+
+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+	reg [7:0] addr = 0;
+	reg [7:0] wdata = 0;
+	wire [7:0] rdata;
+	wire [7:0] rdata_o;
+
+	always @(posedge clk)
+	begin
+		addr = addr + 1;
+		wdata = wdata + 17;
+	end
+
+	  logic [8-1:0] mem [8-1:0];
+		assign rdata_o = mem[addr];
+		always @*
+			if (clk)
+				mem[addr] <= wdata;
+
+    top uut(rdata,wdata,addr,clk,clk);
+
+	uut_mem_checker port_b_test(.clk(clk), .A(rdata), .B(rdata_o));
+
+endmodule
+
+module uut_mem_checker(input clk, input [7:0] A, input [7:0] B);
+    always @(posedge clk)
+    begin
+        #1;
+        if (A != B)
+        begin
+            $display("ERROR: ASSERTION FAILED in %m:",$time,"      ",A," != ",B);
+            $stop;
+        end
+    end
+endmodule

regression/issue_00342/top.v

+`timescale 1ns / 1ns
+module top #(parameter           AWIDTH=8,
+             localparam DEPTH=1<<AWIDTH,
+             parameter  DWIDTH=8)
+ (output [DWIDTH-1:0] rdata,
+ input [DWIDTH-1:0] wdata,
+  input [AWIDTH-1:0] addr,
+  input              r_wn, cs_n);
+  logic [DWIDTH-1:0] mem [DEPTH];
+  assign rdata = mem[addr];
+  always_latch
+    if (!cs_n && !r_wn) mem[addr] <= wdata;
+endmodule

regression/issue_00349/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+
+
+	reg [1:0] in = 0;
+	reg z_p;
+	wire z;
+
+    always @(posedge clk) begin
+		in <= in + 1;
+    end
+
+
+    always @*
+     z_p <= in[0] ~& in[1];
+
+     top uut (in[0],in[1],z);
+
+
+	assert_dff z_test(clk,z,z_p);
+endmodule

regression/issue_00349/top.v

+module top (input wire x, input wire y, output reg z);
+   always @*
+     z <= x ~& y;
+endmodule

regression/issue_00350/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+
+
+	reg i;
+	wire o_p;
+	wire o;
+
+    always @(posedge clk) begin
+		#2
+		i <= ~i;
+    end
+
+	reg q = 0;
+	always @(posedge clk) q <= 1;
+	assign o_p = q & i;
+
+    top uut (clk,i,o);
+
+	assert_dff z_test(clk,o,o_p);
+endmodule

regression/issue_00350/top.v

+module top (input clk, input i, output o);
+  reg q = 0;
+  always @(posedge clk) q <= 1;
+  assign o = q & i;
+endmodule

regression/issue_00361/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+
+	reg [63:0] A, B, C, D = 0;
+	reg [127:0] E, F = 0;
+	reg [127:0] X_p, Y_p;
+	wire [127:0] X,Y;
+
+    always @(posedge clk)
+    begin
+		A = A + 248;
+		B = B + 338;
+		C = C + 435;
+		D = D + 282;
+		E = E + 1248;
+		F = F + 2148;
+    end
+
+
+    integer i;
+        always @* begin
+                X_p = A*B + E;
+                Y_p = F;
+                for (i = 0; i < 64; i=i+1)
+                        Y_p = Y_p + C[i]*D[i];
+        end
+
+	top uut (A,B,C,D,E,F,X,Y);
+
+	uut_checker X_test(.clk(clk), .A(X), .B(X_p));
+	uut_checker Y_test(.clk(clk), .A(Y), .B(Y_p));
+
+endmodule
+
+module uut_checker(input clk, input [127:0] A, input [127:0] B);
+    always @(posedge clk)
+    begin
+        #1;
+        if (A != B)
+        begin
+            $display("ERROR: ASSERTION FAILED in %m:",$time,"      ",A," != ",B);
+            $stop;
+        end
+    end
+endmodule

regression/issue_00361/top.v

+module top (input [63:0] A, B, C, D, input [127:0] E, F, output reg [127:0] X, Y);
+        integer i;
+        always @* begin
+                X = A*B + E;
+                Y = F;
+                for (i = 0; i < 64; i=i+1)
+                        Y = Y + C[i]*D[i];
+        end
+endmodule

regression/issue_00362/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+
+	reg [63:0] A, B, C, D = 0;
+	reg [127:0] E, F = 0;
+	reg [127:0] X_p, Y_p;
+	wire [127:0] X,Y;
+
+    always @(posedge clk)
+    begin
+		A = A + 248;
+		B = B + 338;
+		C = C + 435;
+		D = D + 282;
+		E = E + 1248;
+		F = F + 2148;
+    end
+
+
+    integer i;
+        always @* begin
+                X_p = A*B + E;
+                Y_p = F;
+                for (i = 0; i < 64; i=i+1)
+                        Y_p = Y_p + C[i]*D[i];
+        end
+
+	top uut (A,B,C,D,E,F,X,Y);
+
+	uut_checker X_test(.clk(clk), .A(X), .B(X_p));
+	uut_checker Y_test(.clk(clk), .A(Y), .B(Y_p));
+
+endmodule
+
+module uut_checker(input clk, input [127:0] A, input [127:0] B);
+    always @(posedge clk)
+    begin
+        #1;
+        if (A != B)
+        begin
+            $display("ERROR: ASSERTION FAILED in %m:",$time,"      ",A," != ",B);
+            $stop;
+        end
+    end
+endmodule

regression/issue_00362/top.v

+module inst(a,b);
+output b;
+input a;
+assign b = ~a;
+endmodule
+
+module top(a,b);
+input a;
+output b;
+inst inst(
+.a(a),
+.b(1'b1)
+);
+endmodule

regression/issue_00372/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+
+	reg d = 0;
+	wire q;
+	reg q_p = 0;
+
+    always @(posedge clk)
+		q_p <= d;
+
+	top uut (clk,d,q);
+
+	assert_dff q_test(clk,q,q_p);
+
+endmodule

regression/issue_00372/top.v

+module top(clk,d,q);
+input clk,d;
+output reg q;
+
+always @(posedge clk)
+if (!1'h1)
+  q <= 0;
+else
+  q <= d;
+
+endmodule

regression/issue_00391/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+
+	top uut (clk);
+
+endmodule

regression/issue_00391/top.v

+module decode1_1(input clk,
+		 input 	       rst,
+		 input [31:0]  in_count,
+		 input 	       in_valid,
+		 output        in_ready,
+
+		 input 	       out_ready,
+		 output        out_valid);
+
+   reg [31:0] 		       r_remaining_count;
+   reg 			       r_valid;
+   reg 			       r_ready;
+
+   assign out_valid = r_valid;
+   assign in_ready = r_ready;
+
+   always @(posedge clk) begin
+      if (rst) begin
+	 r_remaining_count <= 0;
+	 r_valid <= 0;
+	 r_ready <= 0;
+      end else begin
+	 if (r_remaining_count == 0) begin
+	    if (r_ready && in_valid) begin
+	       r_remaining_count <= in_count;
+	       r_valid <= in_count != 0;
+	       r_ready <= 0;
+	    end else begin
+	       r_ready <= 1;
+	       r_valid <= 0;
+	    end
+	 end else begin
+	    r_valid <= !(r_remaining_count == 1 && out_ready && out_valid);
+	    r_ready <= 0;
+
+	    if (out_valid && out_ready) begin
+	       r_remaining_count <= r_remaining_count - 1;
+	    end
+	 end
+      end
+   end
+
+endmodule // decode1_1
+
+module top(input clk);
+   wire        out_valid;
+   wire [31:0] out_data;
+   wire        out_ready = 1'b1;
+
+   reg [31:0]  cycles;
+   wire        rst = (cycles < 3);
+
+   wire        in_ready;
+
+   reg [31:0]  test_counts [0:1];
+   reg [31:0]  test_index;
+   wire        in_valid = (test_index < 1) && (cycles > 2);
+
+   reg [9:0]   out_data_index;
+
+   always @(posedge clk)
+     begin
+	cycles <= cycles + 1;
+     end
+
+   always @(posedge clk)
+     begin
+	if (cycles < 1) begin
+	   test_counts[cycles] <= $anyseq;
+	end
+     end
+
+   initial begin
+      cycles  = 0;
+
+      test_index = 0;
+   end
+
+   decode1_1 decoder(clk, rst,
+		 test_counts[test_index],
+		 in_valid,
+		 in_ready,
+
+		 out_ready,
+		 out_valid);
+
+   always @(posedge clk) begin
+      if (!rst) begin
+	 assert(out_data_index <= 0);
+
+	 if (in_valid && in_ready) begin
+	    test_index <= test_index + 1;
+	 end
+	 if (out_ready && out_valid) begin
+	    out_data_index <= out_data_index + 1;
+	 end
+      end
+   end // always @ (posedge clk)
+endmodule

regression/issue_00391/top_clean.v

+module decode1_1(input clk,
+		 input 	       rst,
+		 input [31:0]  in_count,
+		 input 	       in_valid,
+		 output        in_ready,
+
+		 input 	       out_ready,
+		 output        out_valid);
+
+   reg [31:0] 		       r_remaining_count;
+   reg 			       r_valid;
+   reg 			       r_ready;
+
+   assign out_valid = r_valid;
+   assign in_ready = r_ready;
+
+   always @(posedge clk) begin
+      if (rst) begin
+	 r_remaining_count <= 0;
+	 r_valid <= 0;
+	 r_ready <= 0;
+      end else begin
+	 if (r_remaining_count == 0) begin
+	    if (r_ready && in_valid) begin
+	       r_remaining_count <= in_count;
+	       r_valid <= in_count != 0;
+	       r_ready <= 0;
+	    end else begin
+	       r_ready <= 1;
+	       r_valid <= 0;
+	    end
+	 end else begin
+	    r_valid <= !(r_remaining_count == 1 && out_ready && out_valid);
+	    r_ready <= 0;
+
+	    if (out_valid && out_ready) begin
+	       r_remaining_count <= r_remaining_count - 1;
+	    end
+	 end
+      end
+   end
+
+endmodule // decode1_1
+
+module top(input clk);
+   wire        out_valid;
+   wire [31:0] out_data;
+   wire        out_ready = 1'b1;
+
+   reg [31:0]  cycles;
+   wire        rst = (cycles < 3);
+
+   wire        in_ready;
+
+   reg [31:0]  test_counts [0:1];
+   reg [31:0]  test_index;
+   wire        in_valid = (test_index < 1) && (cycles > 2);
+
+   reg [9:0]   out_data_index;
+
+   always @(posedge clk)
+     begin
+	cycles <= cycles + 1;
+     end
+
+   always @(posedge clk)
+     begin
+	if (cycles < 1) begin
+	   //test_counts[cycles] <= $anyseq;
+	end
+     end
+
+   initial begin
+      cycles  = 0;
+
+      test_index = 0;
+   end
+
+   decode1_1 decoder(clk, rst,
+		 test_counts[test_index],
+		 in_valid,
+		 in_ready,
+
+		 out_ready,
+		 out_valid);
+
+   always @(posedge clk) begin
+      if (!rst) begin
+	// assert(out_data_index <= 0);
+
+	 if (in_valid && in_ready) begin
+	    test_index <= test_index + 1;
+	 end
+	 if (out_ready && out_valid) begin
+	    out_data_index <= out_data_index + 1;
+	 end
+      end
+   end // always @ (posedge clk)
+endmodule

regression/issue_00432/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+
+	reg [7:0] a;
+	reg [7:0] b;
+	wire [7:0] c_p;
+	wire [7:0] c;
+
+	always @(posedge clk)
+	begin
+		a = a + 3;
+		b = b + 7;
+	end
+
+	assign c_p = a[$signed(b) +: 8];
+
+	top uut (a, b, c);
+
+	uut_checker c_test(.clk(clk), .A(c_p), .B(c));
+
+endmodule
+
+module uut_checker(input clk, input [7:0] A, input [7:0] B);
+    always @(posedge clk)
+    begin
+        #1;
+        if (A != B)
+        begin
+            $display("ERROR: ASSERTION FAILED in %m:",$time,"      ",A," != ",B);
+            $stop;
+        end
+    end
+endmodule

regression/issue_00432/top.v

+module top(a, b, c);
+  input [7:0] a;
+  input [7:0] b;
+  output [7:0] c;
+
+  assign c = a[$signed(b) +: 8];
+endmodule

regression/issue_00444/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+
+	reg [4:0] a;
+	wire [31:0] c;
+
+	always @(posedge clk)
+	begin
+		a = a + 3;
+	end
+	top uut (clk, a, c);
+
+	uut_checker c_test(.clk(clk), .A(c), .B(c));
+
+endmodule
+
+module uut_checker(input clk, input [31:0] A, input [31:0] B);
+    always @(posedge clk)
+    begin
+        #1;
+        if (A != B)
+        begin
+            $display("ERROR: ASSERTION FAILED in %m:",$time,"      ",A," != ",B);
+            $stop;
+        end
+    end
+endmodule

regression/issue_00444/top.v

+`ifdef FORMAL
+`define assume(_expr_) assume(_expr_)
+`else
+`define assume(_expr_)
+`endif
+
+module top(input clk, input [4:0] addr, output reg [31:0] data);
+	reg [31:0] mem [0:31];
+	always @(posedge clk)
+		data <= mem[addr];
+
+	reg [31:0] used_addr = 0;
+	reg [31:0] used_dbits = 0;
+	reg initstate = 1;
+
+    always @(posedge clk) begin
+        initstate <= 1;
+
+        if (!initstate) begin
+            //`assume(data != 0);
+            //`assume((used_dbits & data) == 0);
+        end
+    end
+endmodule

regression/issue_00449/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+	wire b;
+
+	top uut (clk,b);
+
+	assert_X b_test(.clk(clk), .A(b));
+
+endmodule

regression/issue_00449/top.v

+module top(i_clk,b);
+input i_clk;
+output b;
+
+wire value = 0;
+
+
+reg f_past_gbl_clock_valid;
+initial f_past_gbl_clock_valid = 0;
+always @(posedge i_clk)
+  f_past_gbl_clock_valid <= 1'b1;
+
+always @(posedge i_clk)
+  if ((f_past_gbl_clock_valid)&&(!$rose(i_clk)))
+  begin
+     assert($stable(value));
+  end
+
+assign b = f_past_gbl_clock_valid;
+
+endmodule

regression/issue_00457/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+	wire b;
+
+	top uut (clk,b);
+
+	assert_X b_test(.clk(clk), .A(b));
+
+endmodule

regression/issue_00457/top.v

+module top(i_clk,b);
+input i_clk;
+output b;
+
+wire value = 0;
+
+
+reg f_past_gbl_clock_valid;
+initial f_past_gbl_clock_valid = 0;
+always @(posedge i_clk)
+  f_past_gbl_clock_valid <= 1'b1;
+
+function automatic [19:0] zz_coreArea_uartBridge_uartConfigReg_clockDivider(input dummy);
+    begin
+      zz_coreArea_uartBridge_uartConfigReg_clockDivider = (20'b00000000000000000000);
+      zz_coreArea_uartBridge_uartConfigReg_clockDivider = (20'b00000000000000011010);
+    end
+  endfunction
+
+assign b = f_past_gbl_clock_valid;
+
+endmodule

regression/issue_00474/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+	wire b;
+
+	top uut (clk,b);
+
+	assert_X b_test(.clk(clk), .A(b));
+
+endmodule

regression/issue_00474/top.v

+module top(i_clk,b);
+input i_clk;
+output b;
+
+reg f_past_gbl_clock_valid;
+initial f_past_gbl_clock_valid = 0;
+always @(posedge i_clk)
+  f_past_gbl_clock_valid <= 1'b1;
+assign b = f_past_gbl_clock_valid;
+
+endmodule

regression/issue_00481/testbench.v

+module testbench;
+    reg clk;
+
+    initial begin
+       // $dumpfile("testbench.vcd");
+       // $dumpvars(0, testbench);
+
+        #0 clk = 0;
+        repeat (10000) begin
+            #5 clk = 1;
+            #5 clk = 0;
+        end
+
+        $display("OKAY");
+    end
+
+	wire b;
+
+	top uut (clk,b);
+
+	assert_X b_test(.clk(clk), .A(b));
+
+endmodule

regression/issue_00481/top.v

+module top (
+		 input clkIn,
+		 output clkOut
+		 );
+
+
+ // Set up clock for 48Mhz with input of 12MHz
+   SB_PLL40_CORE #(
+		   .FEEDBACK_PATH("SIMPLE"),
+		   .PLLOUT_SELECT("GENCLK"),
+		   .DIVR(4'b0000),
+		   .DIVF(7'b0111111),
+		   .DIVQ(3'b100),
+		   .FILTER_RANGE(3'b001)
+		   ) uut (
+			  .LOCK(lock),
+			  .RESETB(1'b1),
+			  .BYPASS(1'b0),
+			  .REFERENCECLK(clkIn),
+			  .PLLOUTCORE(clkOut)
+			  );
+endmodule

regression/issue_00502/top.v

+module top (A, B, C, Y);
+    input    A, B, C;
+    output   Y;
+
+   MY_AND3 inst_t1 (.A(A), .B(B), .C(C), .Y(Y) );
+
+endmodule
+
+module MY_AND3 (A, B, C, Y);
+    input    A, B, C;
+    output   Y;
+
+//   MY_AND2 inst_a1 (.A(A), .B(B), .Y(\\SUM/N10) ); // will not read
+   MY_AND2 inst_a1 (.A(A), .B(B), .Y( \\SUM/N10 ) ); // needs whitespaces around net name
+   MY_AND2 inst_a2 (.A(C), .B( \\SUM/N10 ), .Y(Y) );
+
+endmodule
+
+module MY_AND2 (A, B, Y);
+    input     A, B;
+    output    Y;
+
+assign Y = A & B;
+
+endmodule

regression/issue_00524/top.v

+module top(
+    inout  a,
+    inout  b,
+    input  dir,
+);
+
+    wire aout, bout;
+    GP_IOBUF iobufa(
+        .IO(a),
+        .OUT(aout),
+        .IN(bout),
+        .OE(dir)
+    );
+    GP_IOBUF iobufb(
+        .IO(b),
+        .OUT(bout),
+        .IN(aout),
+        .OE(!dir)
+    );
+
+endmodule

regression/issue_00527/sd_rrmux.v

+//----------------------------------------------------------------------
+// Srdy/drdy round-robin arbiter
+// but without the one cycle decision delay.
+//
+// This component supports multiple round-robin modes:
+//
+// Mode 0 : Each input gets a single cycle, regardless of data
+//          availability.  This mode functions like a TDM
+//          demultiplexer.  Output flow control will cause the
+//          component to stall, so that inputs do not miss their
+//          turn due to flow control.
+// Mode 0 fast arb : Each input gets a single grant. If the
+//          output is not ready (p_drdy deasserted), then the
+//          machine will hold on that particular input until it
+//          receives a grant.  Once a single token has been
+//          accepted the machine will round-robin arbitrate.
+//          When there are no requests the machine returns to
+//          its default state.
+// Mode 1 : Each input can transmit for as long as it has data.
+//          When input deasserts, device will begin to hunt for a
+//          new input with data.
+// Mode 2 : Continue to accept input until the incoming data
+//          matches a particular "end pattern".  The end pattern
+//          is provided on the c_rearb (re-arbitrate) input.  When
+//          c_rearb is high, will hunt for new inputs on next clock.
+//
+// This component also supports two arbitration modes: slow and fast.
+// slow rotates the grant from requestor to requestor cycle by cycle,
+// so each requestor gets serviced at most once every #inputs cycles.
+// This can be useful for producing a TDM-type interface, however
+// requestors may be delayed waiting for the grant to come around even
+// if there are no other requestors.
+//
+// Fast mode immediately grants the highest-priority requestor, however
+// it is drdy-noncompliant (drdy will not be asserted until srdy is
+// asserted).
+//
+// Naming convention: c = consumer, p = producer, i = internal interface
+//----------------------------------------------------------------------
+//  Author: Frank Wang
+//
+// This block is uncopyrighted and released into the public domain.
+//----------------------------------------------------------------------
+`ifndef _SD_RRMUX_V_
+`define _SD_RRMUX_V_
+// Clocking statement for synchronous blocks.  Default is for
+// posedge clocking and positive async reset
+`ifndef SDLIB_CLOCKING 
+ `define SDLIB_CLOCKING posedge clk or posedge reset
+`endif
+
+// delay unit for nonblocking assigns, default is to #1 
+`ifndef SDLIB_DELAY 
+ `define SDLIB_DELAY #1  
+`endif
+
+module sd_rrmux
+  #(parameter width=8,
+    parameter inputs=2,
+    parameter mode=0,
+    parameter fast_arb=1)
+  (
+   input               clk,
+   input               reset,
+  
+   input [(width*inputs)-1:0] c_data,
+   input [inputs-1:0]      c_srdy,
+   output  [inputs-1:0]    c_drdy,
+   input                   c_rearb,  // for use with mode 2 only
+
+   output reg [width-1:0]  p_data,
+   output [inputs-1:0]     p_grant,
+   output reg              p_srdy,
+   input                   p_drdy
+   );
+  // bmp for the c_srdy that has just been granted and accepted by p_drdy
+  reg [inputs-1:0]    just_granted;
+  //control path, transit only after p_drdy ("accepted" part).
+  reg [inputs-1:0]    to_be_granted; 
+  //for data path, regardless of p_drdy, help to remove combo loops
+  //rational being, when p_drdy==1'b0, it doesn't matter what p_data is.
+  reg [inputs-1:0]    to_tx_data; 
+
+  wire [width-1:0]     rr_mux_grid [0:inputs-1];
+  reg 		       rr_locked;
+  reg nxt_rr_locked;   // ri lint_check_waive NOT_DRIVEN
+  genvar               i;
+  integer              j;
+
+  assign c_drdy = to_be_granted & {inputs{p_drdy}};
+  assign p_grant = to_be_granted;
+
+  function [inputs-1:0] nxt_grant;
+    input [inputs-1:0] cur_grant;
+    input [inputs-1:0] cur_req;
+    input              cur_accept;
+    reg [inputs-1:0]   msk_req;
+    reg [inputs-1:0]   tmp_grant;
+    reg [inputs-1:0]   tmp_grant2;
+
+    begin
+// scenario: 
+// in cycle 0, src 1 is granted and accepted by p_drdy,
+// in cycle 1, src 3 is requesting, but p_drdy is 0, so c_data3 is presented at p_data with p_srdy
+// in cycle 2, if src 2 comes in requesting, should hold src 3 at p_data till p_drdy, 
+//             src 2 will only participate in next round arb.
+// the way is in this scenario, pretend src2 is the just_granted in cycle 1.
+// so arbitration is excercies in two cases: (1): p_drdy, 
+// or (2) p_not_drdy, the immediate next c_not_srdy, but at least one remote c_srdy
+      
+      msk_req = cur_req & ~((cur_grant - 1) | cur_grant);
+      tmp_grant = msk_req & (~msk_req + 1);
+      tmp_grant2 = cur_req & (~cur_req + 1);
+
+      if(cur_accept)begin
+          if (msk_req != 0) nxt_grant = tmp_grant;
+          else nxt_grant = tmp_grant2;
+      //end else if (rem_neighbor_rearb) begin
+      end else if (| cur_req) begin
+          if (msk_req != 0) nxt_grant = {tmp_grant[0],tmp_grant[inputs-1:1]};
+          else nxt_grant = {tmp_grant2[0],tmp_grant2[inputs-1:1]};
+      end else begin
+          nxt_grant = cur_grant;
+      end
+    end
+  endfunction
+  
+  generate
+    for (i=0; i<inputs; i=i+1)
+      begin : grid_assign
+        //assign rr_mux_grid[i] = c_data >> (i*width);
+        assign rr_mux_grid[i] = c_data[i*width+width-1 : i*width]; 
+      end
+
+    if (mode == 2)
+      begin : tp_gen
+        always @*
+          begin
+            nxt_rr_locked = rr_locked;
+
+            if ((c_srdy & just_granted) & (!rr_locked))
+              nxt_rr_locked = 1;
+            else if ((c_srdy & just_granted & c_rearb))
+              nxt_rr_locked = 0;
+          end
+
+        always @(`SDLIB_CLOCKING)
+          begin
+            if (reset)
+              rr_locked <= 0;
+            else
+              rr_locked <= nxt_rr_locked;
+          end
+      end // block: tp_gen
+  endgenerate
+
+//  always @*
+//    begin
+//      p_data = 0;
+//      p_srdy = 0;
+//      for (j=0; j<inputs; j=j+1)
+//        if (just_granted[j])
+//          begin
+//            p_data = rr_mux_grid[j];
+//            p_srdy = c_srdy[j];
+//          end
+//    end
+always @(*) begin
+    p_srdy = | c_srdy;
+
+    p_data = {width{1'b0}};
+    for (j=0; j<inputs; j=j+1) begin
+        if (to_tx_data[j]) begin
+            p_data = rr_mux_grid[j];
+            p_srdy = c_srdy[j];
+        end
+    end
+end
+  
+  always @*
+    begin
+      to_tx_data = just_granted;
+      to_be_granted = just_granted;
+      if ((mode ==  1) & (|(c_srdy & just_granted)))
+        to_be_granted = just_granted;
+      else if ((mode == 0) && !fast_arb)begin
+        to_be_granted=p_drdy?{just_granted[0],just_granted[inputs-1:1]}:just_granted;
+        to_tx_data={just_granted[0],just_granted[inputs-1:1]};
+      end
+      //else if ((mode == 0) && |(just_granted & c_srdy) && !p_drdy && fast_arb)
+      //  to_be_granted = just_granted;
+      else if ((mode == 2) & (nxt_rr_locked | (|(c_srdy & just_granted))))
+        to_be_granted = just_granted;
+      else if (fast_arb) begin
+        to_be_granted=nxt_grant (just_granted, c_srdy, p_drdy);
+        to_tx_data = nxt_grant(just_granted, c_srdy, 1'b1);
+      end
+      else begin
+        to_be_granted=p_drdy?{just_granted[0],just_granted[inputs-1:1]}:just_granted;
+        to_tx_data={just_granted[0],just_granted[inputs-1:1]};
+      end
+    end
+
+  always @(`SDLIB_CLOCKING)
+    begin
+      if (reset)
+        just_granted <= {1'b1,{inputs-1{1'b0}}};
+      else
+        if (to_be_granted==0)
+            just_granted <= just_granted;
+        else
+            just_granted <= to_be_granted;
+    end
+
+endmodule 
+`endif //  _SD_RRMUX_V_

regression/issue_00527/syn.tcl

+# Basic synthesis file to replicate DFFSR bug
+
+yosys -import
+set libfile osu018_stdcells_edit.lib
+
+read_verilog -sv sd_rrmux.v
+
+# Vanilla synth flow
+hierarchy
+procs
+fsm
+opt
+techmap
+opt
+
+dfflibmap -liberty $libfile
+
+abc -liberty $libfile
+
+clean
+
+write_verilog sd_rrmux_osu.gv
+

regression/issue_00527/testcase

+#!/bin/bash
+
+yosys -t syn.tcl
+
+if grep -q DFFSR sd_rrmux_osu.gv; then
+  echo "FAILED -- DFFSR present in netlist"
+else
+  echo "PASSED -- DFFSR not present"
+fi
+

regression/run.sh

@@ -2,41 +2,97 @@
 
 set -ex
 test -d $1
-
-if [ "$2" != "verify" -a "$2" != "falsify" ]; then
-	test -f scripts/$2.ys
-fi
+test -f scripts/$2.ys
 
 rm -rf $1/work_$2
 mkdir $1/work_$2
 cd $1/work_$2
 
-if [ "$2" = "verify" ]; then
-	iverilog -g 2012 -o testbench ../testbench.v ../../common.v ../top.v ../../../../../techlibs/xilinx/brams_bb.v
-elif [ "$2" = "falsify" ]; then
-	iverilog -DBUG -g 2012 -o testbench ../testbench.v ../../common.v ../top.v ../../../../../techlibs/xilinx/brams_bb.v
-else
-	yosys -ql yosys.log ../../scripts/$2.ys
-	iverilog -o testbench ../testbench.v ../../common.v synth.v $(yosys-config --datdir/simcells.v) ../../../../../techlibs/xilinx/brams_bb.v
-fi
 
-if [ "$2" = "falsify" ]; then
-	if vvp -N testbench > testbench.log 2>&1; then
-		echo FAIL > ${1}_${2}.status
-	elif ! grep 'ERROR' testbench.log || grep 'OKAY' testbench.log; then
-		echo FAIL > ${1}_${2}.status
+# cases where 'syntax error' or other errors are expected
+if [ "$1" = "issue_00089" ] ||\
+   [ "$1" = "issue_00093" ] ||\
+   [ "$1" = "issue_00095" ] ||\
+   [ "$1" = "issue_00096" ] ||\
+   [ "$1" = "issue_00196" ] ||\
+   [ "$1" = "issue_00362" ]; then
+
+	expected_string="syntax error"
+    #Change checked string for check other errors
+	if [ "$1" = "issue_00196" ]; then
+		expected_string="Found posedge/negedge event"
+	elif [ "$1" = "issue_00362" ]; then
+		expected_string="is connected to constants:"
+	fi
+
+	if yosys -ql yosys.log ../../scripts/$2.ys; then
+		echo fail > ${1}_${2}.status
 	else
-		echo pass > ${1}_${2}.status
+		if grep "$expected_string" yosys.log; then
+			echo pass > ${1}_${2}.status
+		else
+			echo fail > ${1}_${2}.status
+		fi
+	fi
+
+# cases where some object names are/aren't expected in output file (tee -o result.log in the test script)
+elif [ "$1" = "issue_00502" ] ||\
+     [ "$1" = "issue_00524" ] ||\
+     [ "$1" = "issue_00527" ]; then
+
+	expected_string=""
+	expected="1"
+	if [ "$1" = "issue_00502" ]; then
+		expected_string="\\SUM/N10"
+	elif [ "$1" = "issue_00524" ]; then
+		expected_string="GP_INV"
+	elif [ "$1" = "issue_00527" ]; then
+		expected_string="DFFSR"
+		expected="0"
 	fi
+
+	yosys -ql yosys.log ../../scripts/$2.ys;
+	if grep "$expected_string" result.log; then
+		if [ $expected = "1" ]; then
+			echo pass > ${1}_${2}.status
+		else
+			echo fail > ${1}_${2}.status
+		fi
+	else
+		if [ $expected = "1" ]; then
+			echo fail > ${1}_${2}.status
+		else
+			echo pass > ${1}_${2}.status
+		fi
+	fi
+
+
+# cases with simulation checks
 else
+
+	iverilog_adds=""
+	#Additional sources for iverilog simulation
+	if [ "$1" = "issue_00084" ]; then
+		iverilog_adds="../../../../../techlibs/xilinx/brams_bb.v"
+	elif [ "$1" = "issue_00160" ] ||\
+		 [ "$1" = "issue_00182" ] ||\
+		 [ "$1" = "issue_00183" ] ||\
+		 [ "$1" = "issue_00481" ]; then
+		iverilog_adds="../../../../../techlibs/ice40/cells_sim.v"
+	fi
+
+	yosys -ql yosys.log ../../scripts/$2.ys
+	iverilog -o testbench  ../testbench.v synth.v ../../common.v ../../../../../techlibs/common/simcells.v ../../../../../techlibs/common/simlib.v $iverilog_adds
 	if ! vvp -N testbench > testbench.log 2>&1; then
 		grep 'ERROR' testbench.log
-		echo FAIL > ${1}_${2}.status
+		echo fail > ${1}_${2}.status
 	elif grep 'ERROR' testbench.log || ! grep 'OKAY' testbench.log; then
-		echo FAIL > ${1}_${2}.status
+		echo fail > ${1}_${2}.status
 	else
 		echo pass > ${1}_${2}.status
 	fi
+
 fi
 
+
 touch .stamp