Apparatus and method for vector multiply and accumulate of unsigned doublewords

A method comprising:

• decoding an instruction, the instruction including an opcode, and operands identifying a plurality of packed data source registers and a packed data destination register;
• multiplying first and second packed doubleword data elements from a first source register with third and fourth packed doubleword data elements from a second source register, respectively, to generate first and second temporary quadword products, the first, second, third, and fourth doubleword data elements to be selected based on the opcode of the instruction;
• accumulating the first temporary quadword product with a first packed quadword value read from the third source register to generate a first accumulated quadword result and accumulating the second temporary quadword product with a second packed quadword value read from a third source register to generate a second accumulated quadword result;
• storing the first accumulated quadword result in a first quadword data element position in a destination register or the third source register and storing the second accumulated quadword result in a second quadword data element position in the destination register or the third source register.

A machine-readable medium having program code stored thereon which, when executed by a machine, causes the machine to perform the operations of:

• decoding an instruction, the instruction including an opcode, and operands identifying a plurality of packed data source registers and a packed data destination register;
• multiplying first and second packed doubleword data elements from a first source register with third and fourth packed doubleword data elements from a second source register, respectively, to generate first and second temporary quadword products, the first, second, third, and fourth doubleword data elements to be selected based on the opcode of the instruction;
• accumulating the first temporary quadword product with a first packed quadword value read from the third source register to generate a first accumulated quadword result and accumulating the second temporary quadword product with a second packed quadword value read from a third source register to generate a second accumulated quadword result;
• storing the first accumulated quadword result in a first quadword data element position in a destination register or the third source register and storing the second accumulated quadword result in a second quadword data element position in the destination register or the third source register.