Add regression test for foreach count direction

Check that foreach counts counts from $left to $right. This means it should
count up if $left is less than $right and count down otherwise.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>

ivtest/ivltests/sv_foreach10.v

@@ -0,0 +1,40 @@
+// Check that foreach counts from $left to $right for dynamic arrays and queues.
+
+module test;
+
+  logic d[];
+  logic q[$];
+
+  initial begin
+    bit failed;
+    int exp_idx;
+
+    failed = 1'b0;
+
+    // Dynamic arrays and queues always count from 0 to $size - 1
+    d = '{0, 0};
+    exp_idx = 0;
+    foreach(d[idx]) begin
+      if (idx !== exp_idx) begin
+        $display("FAILED: Expected %0d, got %0d", exp_idx, idx);
+        failed = 1'b1;
+      end
+      exp_idx++;
+    end
+
+    q = '{0, 0, 0};
+    exp_idx = 0;
+    foreach(q[idx]) begin
+      if (idx !== exp_idx) begin
+        $display("FAILED: Expected %0d, got %0d", exp_idx, idx);
+        failed = 1'b1;
+      end
+      exp_idx++;
+    end
+
+    if (!failed) begin
+      $display("PASSED");
+    end
+  end
+
+endmodule

ivtest/ivltests/sv_foreach9.v

@@ -0,0 +1,13 @@
+// Check that foreach counts from $left to $right for static arrays.
+
+module test;
+
+  logic [0:1][2:0] x[0:6][4:0][11];
+
+  initial begin
+    foreach(x[i,j,k,l,n]) begin
+      $display(i, j, k, l, n);
+    end
+  end
+
+endmodule

ivtest/regress-vvp.list

@@ -33,3 +33,5 @@ pr903				vvp_tests/pr903.json
 pr903-vlog95			vvp_tests/pr903-vlog95.json
 struct_packed_write_read	vvp_tests/struct_packed_write_read.json
 struct_packed_write_read2	vvp_tests/struct_packed_write_read2.json
+sv_foreach9			vvp_tests/sv_foreach9.json
+sv_foreach10			vvp_tests/sv_foreach10.json

ivtest/vvp_tests/sv_foreach10.json

@@ -0,0 +1,5 @@
+{
+    "type"          : "normal",
+    "source"        : "sv_foreach10.v",
+    "iverilog-args" : [ "-g2009" ]
+}

ivtest/vvp_tests/sv_foreach9.json

@@ -0,0 +1,6 @@
+{
+    "type"          : "normal",
+    "source"        : "sv_foreach9.v",
+    "iverilog-args" : [ "-g2009" ],
+    "gold"          : "sv_foreach9"
+}