Stashing specific merge end trigger for stashing merged data

A method of controlling stashing of data, comprising:

• decoding a sequence of instructions within decoder circuitry of a first processing element coupled to interconnect circuitry, in order to generate control signals;
• responsive to the control signals, performing within processing circuitry of the first processing element operations defined by the sequence of instructions;
• determining that a merging condition is present;
• in response to the control signals received from the decoder circuitry due to decoding N data update instructions that each specify updated data to be made available for stashing in an associated storage structure of at least one further processing element coupled to the interconnect circuitry, where N is an integer greater than or equal to 1, and determining that the merging condition is present, causing the processing circuitry to buffer the updated data to be made available for stashing specified by the N data update instructions;
• detecting a stashing specific merge end trigger, and determining that the merging condition is no longer present in response to the stashing specific merge end trigger;
• and
• in response to determining that the merging condition is no longer present, causing the processing circuitry to initiate a merged data update stashing transaction via an interface used to couple the first processing element to the interconnect circuitry, the merged data update stashing transaction specifying, as merged updated data, the updated data specified by the N data update instructions buffered in the merge buffer, and triggering stashing control circuitry accessible via the interconnect circuitry to cause the merged updated data to be made available for stashing in the associated storage structure of the at least one further processing element coupled to the interconnect circuitry.