Systems, apparatuses, and methods for multiplication and accumulation of vector packed signed values

An apparatus, comprising:

• a decoder to decode an instruction having fields for a first and second packed data source operand, and a packed data destination operand;
• and
• execution circuitry to execute the decoded instruction to:
• multiply selected signed data values from a plurality of packed data element positions in the first and second packed data source operands to generate a plurality of first signed result values;
• sum the plurality of first signed result values to generate one or more second signed result values;
• accumulate the one or more second signed result values with one or more data values from the destination operand to generate one or more third signed result values;
• and
• store the one or more third signed result values in one or more packed data element positions in the destination operand.

A non-transitory machine-readable medium storing an instruction which when executed by a processor causes the processor to perform operations comprising:

• decoding an instruction having fields for a first and a second packed data source operand, and a packed data destination operand, and
• executing the decoded instruction, by execution circuitry, to:
• multiply selected signed data values from a plurality of packed data element positions in the first and second packed data source operands to generate a plurality of first signed result values;
• sum the plurality of first signed result values to generate one or more second signed result values;
• accumulate the one or more second signed result values with one or more data values from the destination operand to generate one or more third signed result values;
• and
• store the one or more third signed result values in one or more packed data element positions in the destination operand.