Select#
The select operation (or qpl_operation.qpl_op_select
) can be considered
as a generalization of the qpl_operation.qpl_op_extract
operation
(see Extract for more information).
Here, source-2 is a bit-vector that must have
at least as many elements as source-1. Those source-1 items that correspond
to 1-bits in source-2 will be the output.