Merge pull request #2122 from PeterCrozier/struct_array2

Support 2D bit arrays in structures. Optimise array indexing.

tests/svtypes/struct_array.sv

@@ -1,7 +1,7 @@
 // test for array indexing in structures
 
 module top;
-	
+
 	struct packed {
 		bit [5:0] [7:0] a;	// 6 element packed array of bytes
 		bit [15:0] b;		// filler for non-zero offset
@@ -19,4 +19,24 @@ module top;
 
 	always_comb assert(s==64'h4200_0012_3400_FFFC);
 
+	struct packed {
+		bit [7:0] [7:0] a;	// 8 element packed array of bytes
+		bit [15:0] b;		// filler for non-zero offset
+	} s2;
+
+	initial begin
+		s2 = '0;
+
+		s2.a[2:1] = 16'h1234;
+		s2.a[5] = 8'h42;
+
+		s2.a[7] = '1;
+		s2.a[7][1:0] = '0;
+
+		s2.b = '1;
+		s2.b[1:0] = '0;
+	end
+
+	always_comb assert(s2==80'hFC00_4200_0012_3400_FFFC);
+
 endmodule