Element by vector operations in a data processing apparatus

A method of data processing comprising:

• decoding a data processing instruction to generate control signals, the data processing instruction specifying in a plurality of registers:
• a first source register, a second source register, and an index,
• wherein each of the first source register and the second source register has a size which is an integer multiple at least twice a predefined size of a data group, and each data group comprises a plurality of data elements;
• and
• performing a data processing operation in response to the control signals with respect to each said data group in the first source register and the second source register to generate respective result data groups forming a result of the data processing operation,
• wherein operands of the data processing operation for each said data group are a selected data element identified in the data group of the first source register by the index and each data element in the data group of the second source register.

A computer-readable storage medium storing in a non-transient fashion a program comprising at least one data processing instruction which when executed by a data processing apparatus causes:

• generation of control signals in response to the data processing instruction, the data processing instruction specifying in a plurality of registers:
• a first source register, a second source register, and an index,
• wherein each of the first source register and the second source register has a size which is an integer multiple at least twice a predefined size of a data group, and each data group comprises a plurality of data elements;
• and
• performance of a data processing operation in response to the control signals with respect to each said data group in the first source register and the second source register to generate respective result data groups forming a result of the data processing operation,
• wherein operands of the data processing operation for each said data group are a selected data element identified in the data group of the first source register by the index and each data element in the data group of the second source register.