An integrated circuit includes a plurality of tiles. Each tile comprises a
processor; and a switch including switching circuitry to forward data
over data paths from other tiles to the processor and to switches of
other tiles according to a switch instruction indicating an input port to
which each of multiple output ports of the switch is to be coupled. The
switch is able to operate in a first mode in which successive input data
arriving at the switch are forwarded according to a different switch
instruction, and a second mode in which successive input data arriving at
the switch are forwarded according to the same switch instruction.