Fix coverage of real arrays giving operator^ not defined

src/V3Clock.cpp

@@ -122,8 +122,15 @@ class ClockVisitor final : public VNVisitor {
         AstNodeExpr* const origp = nodep->origp()->unlinkFrBack();
         AstNodeExpr* const changeWrp = nodep->changep()->unlinkFrBack();
         AstNodeExpr* const changeRdp = ConvertWriteRefsToRead::main(changeWrp->cloneTree(false));
-        AstIf* const newp
+        AstNodeExpr* comparedp = nullptr;
-            = new AstIf{nodep->fileline(), new AstXor{nodep->fileline(), origp, changeRdp}, incp};
+        // Xor will optimize better than Eq, when CoverToggle has bit selects,
+        // but can only use Xor with non-opaque types
+        if (const AstBasicDType* const bdtypep
+            = VN_CAST(origp->dtypep()->skipRefp(), BasicDType)) {
+            if (!bdtypep->isOpaque()) comparedp = new AstXor{nodep->fileline(), origp, changeRdp};
+        }
+        if (!comparedp) comparedp = AstEq::newTyped(nodep->fileline(), origp, changeRdp);
+        AstIf* const newp = new AstIf{nodep->fileline(), comparedp, incp};
         // We could add another IF to detect posedges, and only increment if so.
         // It's another whole branch though versus a potential memory miss.
         // We'll go with the miss.

test_regress/t/t_cover_toggle.out

@@ -7,13 +7,12 @@
         
         module t (/*AUTOARG*/
            // Inputs
-           clk,
+           clk, check_real, check_array_real, check_string
-           check_real,
-           check_string
            );
         
  000019    input clk;
            input real check_real; // Check issue #2741
+ 000021    input real check_array_real [1:0];
            input string check_string; // Check issue #2766
         
            typedef struct packed {

test_regress/t/t_cover_toggle.v

@@ -6,13 +6,12 @@
 
 module t (/*AUTOARG*/
    // Inputs
-   clk,
+   clk, check_real, check_array_real, check_string
-   check_real,
-   check_string
    );
 
    input clk;
    input real check_real; // Check issue #2741
+   input real check_array_real [1:0];
    input string check_string; // Check issue #2766
 
    typedef struct packed {

test_regress/t/t_cover_toggle_points.out

@@ -7,14 +7,15 @@
         
         module t (/*AUTOARG*/
            // Inputs
-           clk,
+           clk, check_real, check_array_real, check_string
-           check_real,
-           check_string
            );
         
  000019    input clk;
 +000019  point: comment=clk
            input real check_real; // Check issue #2741
+ 000021    input real check_array_real [1:0];
++000021  point: comment=check_array_real[0]
++000021  point: comment=check_array_real[1]
            input string check_string; // Check issue #2766
         
            typedef struct packed {