attrmvcp - move or copy attributes from wires to driving cells

yosys> help attrmvcp
attrmvcp [options] [selection]
Move or copy attributes on wires to the cells driving them.
By default, attributes are moved. This will only add
the attribute to the cell, without removing it from
the wire.
If no selected cell consumes the attribute, then it is
left on the wire by default. This option will cause the
attribute to be removed from the wire, even if no selected
cell takes it.
By default, attriburtes are moved to the cell driving the
wire. With this option set it will be moved to the cell
driven by the wire instead.
-attr <attrname>
Move or copy this attribute. This option can be used
multiple times.