In reply to gagan_billing:
In that case, you will want to define 32 bins, one for each bit:
wildcard bins type_00 = { 32'b????_????_????_????_????_????_????_???1 };
wildcard bins type_01 = { 32'b????_????_????_????_????_????_????_??1? };
.
.
.
wildcard bins type_31 = { 32'b1???_????_????_????_????_????_????_???? };
You can then cross those bins as required.