Fix wildcard equality and inside operators for non-fourstate expressions (#5673)

src/V3Tristate.cpp

@@ -1412,9 +1412,9 @@ class TristateVisitor final : public TristateBaseVisitor {
         }
     }
     void visitEqNeqWild(AstNodeBiop* nodep) {
-        if (!VN_IS(nodep->rhsp(), Const)) {
-            nodep->v3warn(E_UNSUPPORTED,  // Says spac.
-                          "Unsupported: RHS of ==? or !=? must be constant to be synthesizable");
+        if (!VN_IS(nodep->rhsp(), Const) && nodep->rhsp()->dtypep()->isFourstate()) {
+            nodep->v3warn(E_UNSUPPORTED,
+                          "Unsupported: RHS of ==? or !=? is fourstate but not a constant");
             // rhs we want to keep X/Z intact, so otherwise ignore
         }
         iterateAndNextNull(nodep->lhsp());

src/V3Unknown.cpp

@@ -237,9 +237,11 @@ class UnknownVisitor final : public VNVisitor {
             AstNodeExpr* const rhsp = nodep->rhsp()->unlinkFrBack();
             AstNodeExpr* newp;
             if (!VN_IS(rhsp, Const)) {
-                nodep->v3warn(E_UNSUPPORTED, "Unsupported: RHS of ==? or !=? must be "
-                                             "constant to be synthesizable");  // Says spec.
-                // Replace with anything that won't cause more errors
+                if (rhsp->dtypep()->isFourstate()) {
+                    nodep->v3warn(
+                        E_UNSUPPORTED,
+                        "Unsupported: RHS of ==? or !=? is fourstate but not a constant");
+                }
                 newp = new AstEq{nodep->fileline(), lhsp, rhsp};
             } else {
                 // X or Z's become mask, ala case statements.

test_regress/t/t_eq_wild.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2024 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+import vltest_bootstrap
+
+test.scenarios('simulator')
+
+test.compile()
+
+test.execute()
+
+test.passes()

test_regress/t/t_eq_wild.v

@@ -0,0 +1,21 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2024 by Antmicro.
+// SPDX-License-Identifier: CC0-1.0
+
+function bit get_1_or_0(bit get_1);
+   return get_1 ? 1'b1 : 1'b0;
+endfunction
+
+module t (/*AUTOARG*/);
+
+   initial begin
+      if (get_1_or_0(0) ==? get_1_or_0(1)) $stop;
+      if (!(get_1_or_0(0) !=? get_1_or_0(1))) $stop;
+
+      $write("*-* All Finished *-*\n");
+      $finish;
+   end
+
+endmodule

test_regress/t/t_eq_wild_unsup.out

@@ -0,0 +1,6 @@
+%Error-UNSUPPORTED: t/t_eq_wild_unsup.v:13:13: Unsupported: RHS of ==? or !=? is fourstate but not a constant
+                                             : ... note: In instance 't'
+   13 |       if (1 ==? get_x_or_0(0)) $stop;
+      |             ^~~
+                    ... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest
+%Error: Exiting due to

test_regress/t/t_eq_wild_unsup.py

@@ -0,0 +1,16 @@
+#!/usr/bin/env python3
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2024 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+import vltest_bootstrap
+
+test.scenarios('vlt')
+
+test.lint(fails=True, expect_filename=test.golden_filename)
+
+test.passes()

test_regress/t/t_eq_wild_unsup.v

@@ -0,0 +1,19 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2024 by Antmicro.
+// SPDX-License-Identifier: CC0-1.0
+
+function logic get_x_or_0(logic get_x);
+   return get_x ? 1'bx : 1'b0;
+endfunction
+
+module t;
+   initial begin
+      if (1 ==? get_x_or_0(0)) $stop;
+
+      $write("*-* All Finished *-*\n");
+      $finish;
+   end
+
+endmodule

test_regress/t/t_inside_queue_elem.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2024 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+import vltest_bootstrap
+
+test.scenarios('simulator')
+
+test.compile()
+
+test.execute()
+
+test.passes()

test_regress/t/t_inside_queue_elem.v

@@ -0,0 +1,18 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain, for
+// any use, without warranty, 2024 by Antmicro.
+// SPDX-License-Identifier: CC0-1.0
+
+module t (/*AUTOARG*/);
+
+   initial begin
+      int q[$] = {1, 2};
+      if (!(1 inside {q[0], q[1]})) $stop;
+      if (3 inside {q[0], q[1]}) $stop;
+
+      $write("*-* All Finished *-*\n");
+      $finish;
+   end
+
+endmodule