Circuitry comprises processing circuitry configured to execute program instructions in dependence upon respective trigger conditions matching a current trigger state and to set a next trigger state in response to program instruction execution; the processing circuitry comprising: instruction storage configured to selectively provide a group of two or more program instructions for execution in parallel; and trigger circuitry responsive to the generation of a trigger state by execution of program instructions and to a trigger condition associated with a given group of program instructions, to control the instruction storage to provide program instructions of the given group of program instructions for execution.