Vector processing engines having programmable data path configurations for providing multi-mode radix-2x butterfly vector processing circuits, and related vector processors, systems, and methods

A vector processing engine (VPE) configured to provide at least one multi-mode Radix-2X butterfly vector processing circuit, comprising:

• at least one multiply vector processing stage means comprising at least one multiplier block means configured to:
• receive a Radix vector data input sample set from a plurality of Radix vector data input sample sets from a first input data path among a plurality of input data paths;
• and
• multiply the Radix vector data input sample set with a twiddle factor component to provide a Radix vector multiply output sample set in a plurality of multiply output data paths based on a programmable multiply data path configuration according to a Radix butterfly vector instruction executed by the at least one multiply vector processing stage means;
• and
• at least one accumulation vector processing stage means comprising a plurality of accumulator block means, each accumulator block means among the plurality of accumulator block means configured to:
• receive a plurality of Radix vector multiply output sample sets from a multiply output data path among the plurality of multiply output data paths based on a programmable accumulator data path configuration;
• accumulate the received plurality of Radix vector multiply output sample sets to provide a Radix vector accumulated result sample set based on the programmable accumulator data path configuration;
• and
• provide the Radix vector accumulated result sample set in an output data path among a plurality of output data paths;
• and
• an output processing stage means configured to receive a plurality of Radix vector accumulated result sample sets from each of the plurality of accumulator blocks.

A method of processing Radix-2X vector data in a multi-mode Radix-2X butterfly vector processing circuit processing in a vector processing engine (VPE), comprising:

• receiving a Radix vector data input sample set from a plurality of Radix vector data input sample sets from a first input data path among a plurality of input data paths in at least one multiplier block in at least one multiply vector processing stage;
• multiplying in the at least one multiplier block, the Radix vector data input sample set with a twiddle factor component to provide a Radix vector multiply output sample set in a plurality of multiply output data paths based on a programmable multiply data path configuration according to a Radix butterfly vector instruction executed by the at least one multiply vector processing stage;
• receiving a plurality of Radix vector multiply output sample sets from a multiply output data path among the plurality of multiply output data paths based on an accumulator programmable accumulator data path configuration in each accumulator block among a plurality of accumulator blocks in at least one accumulation vector processing stage;
• accumulating the received plurality of Radix vector multiply output sample sets to provide a Radix vector accumulated result sample set based on the accumulator programmable accumulator data path configuration;
• providing the Radix vector accumulated result sample set in an output data path among a plurality of output data paths;
• and
• receiving in an output processing stage, a plurality of Radix vector accumulated result sample sets from each of the plurality of accumulator blocks.