conversion for implicitly variably sized parameters

test/basic/string_param.v

@@ -0,0 +1,16 @@
+`include "string_param.vh"
+
+module Example(inp, out);
+    parameter PATTERN = "whatever";
+    parameter IN_WIDTH = $bits(PATTERN);
+    localparam OUT_WIDTH = `COUNT_ONES(PATTERN);
+
+    input wire [IN_WIDTH - 1:0] inp;
+    output wire [OUT_WIDTH - 1:0] out;
+    if (PATTERN[0])
+        assign out[0] = inp[0];
+    genvar j;
+    for (j = 1; j < IN_WIDTH; j = j + 1)
+        if (PATTERN[j])
+            assign out[`COUNT_ONES(PATTERN[j - 1:0])] = inp[j];
+endmodule