1. A computer-implemented method for performing automatic speech recognition, the method comprising, using at least one processor programmed to perform: loading a first set of data elements into a lookup table having a base address; loading a vector register with a translation constant corresponding to an arrangement of the first set of data elements; loading a second set of data elements into an index register; invoking a vector addition instruction to combine the translation constant and the index register; invoking a vector permute instruction on the first set of data elements at the base address and the combined translation constant and index register to decode the second set of data elements into a set of segments in a destination memory; reconstructing a plurality of quantized values into a plurality of dequantized values in parallel; producing, based on the plurality of dequantized values, a plurality of enhanced feature vectors; and outputting the plurality of enhanced feature vectors to a speech recognizer that performs automatic speech recognition based on the plurality of enhanced feature vectors.