Systems, apparatuses, and methods for dual complex by complex conjugate multiply of signed words

A method 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:
• multiplex data values from a plurality of packed data element positions in the first and second packed data source operands to at least one multiplier circuit, the first and second packed data source operands including a plurality of pairs complex numbers, each pair of complex numbers including data values at shared packed data element positions in the first and second packed data source operands;
• calculate a real part and an imaginary part of a product of a first complex number and a complex conjugate of a second complex number;
• and
• store the real part to a first packed data element position in the destination operand and store the imaginary part to a second packed data element position in the destination operand.

A non-transitory machine-readable medium storing an instruction which when executed by a processor causes the processor to perform a method, the method 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:
• multiplex data values from a plurality of packed data element positions in the first and second packed data source operands to at least one multiplier circuit, the first and second packed data source operands including a plurality of pairs complex numbers, each pair of complex numbers including data values at shared packed data element positions in the first and second packed data source operands;
• calculate a real part and an imaginary part of a product of a first complex number and a complex conjugate of a second complex number;
• and
• store the real part to a first packed data element position in the destination operand and store the imaginary part to a second packed data element position in the destination operand.