US 2019/0163472 A1Published application

Apparatus and method for complex multiply and accumulate

AssigneeIntel Corporation

InventorsRobert Valentine, Mark Charney, Raanan Sade, Elmoustapha Ould-Ahmed-Vall, Jesus Corbal, Roman S. Dubtsov

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Abstract

An embodiment of the invention is a processor including execution circuitry to calculate, in response to a decoded instruction, a result of a complex multiply-accumulate of a first complex number, a second complex number, and a third complex number. The calculation includes a first operation to calculate a first term of a real component of the result and a first term of the imaginary component of the result. The calculation also includes a second operation to calculate a second term of the real component of the result and a second term of the imaginary component of the result. The processor also includes a decoder to decode an instruction to generate the decoded instruction and a first source register, a second source register, and a source and destination register to provide the first complex number, the second complex number, and the third complex number, respectively.

Claims20

Dependent claims

A processor comprising:

a decoder to decode a first instruction to generate a first decoded instruction;
a first source register in which to store a first complex number having a first real component and a first imaginary component;
a second source register in which to store a second complex number having a second real component and a second imaginary component;
a source and destination register to store a third complex number having a third real component and a third imaginary component;
execution circuitry to execute the first decoded instruction, wherein execution of the first decoded instruction is to include performing a calculation including a first operation and a second operation, the calculation to calculate a result of a complex multiplication of the first complex number and the second complex number and a complex addition of the third complex number, the result to include a fourth real component and a fourth imaginary component, the first operation to calculate a first term of the fourth real component and a first term of the fourth imaginary component, the second operation to calculate a second term of the fourth real component and a second term of the fourth imaginary component.

2 more elements

A method comprising:

decoding a first instruction to generate a first micro-operation and a second micro-operation, the first instruction to specify a first operand having a first real component and a first imaginary component, a second operand having a second real component and a second imaginary component, and a third operand having a third real component and a third imaginary component;
executing the first micro-operation to calculate a first term of a fourth real component and a first term of a fourth imaginary component;
executing the second micro-operation to calculate a second term of the fourth real component and a second term of the fourth imaginary component, negate the second term of the fourth real component to generate a negated second term of the fourth real component, add the first term of the fourth real component and the negated second term of the fourth real component to calculate the fourth real component, and add the second term of the third imaginary component to the second term of the fourth imaginary component to calculate the fourth imaginary component;
and
storing the fourth real component and the fourth imaginary component in a destination register.

2 more elements

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

decode a first instruction to generate a first micro-operation and a second micro-operation, the first instruction to specify a first operand having a first real component and a first imaginary component, a second operand having a second real component and a second imaginary component, and a third operand having a third real component and a third imaginary component;
execute the first micro-operation to calculate a first term of a fourth real component and a first term of a fourth imaginary component;
execute the second micro-operation to calculate a second term of the fourth real component and a second term of the fourth imaginary component, negate the second term of the fourth real component to generate a negated second term of the fourth real component, add the first term of the fourth real component and the negated second term of the fourth real component to calculate the fourth real component, and add the second term of the fourth imaginary component to the second term of the fourth imaginary component to calculate the fourth imaginary component;
and
store the fourth real component and the fourth imaginary component in a destination register.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/824,324Filed 28 Nov 2017
Published: 30 May 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

G06F 9/3001
To perform operations on data operands: arithmetic instructions
G06F 9/3893
Using a plurality of independent parallel functional units: controlled in tandem, e.g. multiplier-accumulator
G06F 9/30036
To perform operations on data operands: instructions to perform operations on packed data, e.g. vector, tile or matrix operations
G06F 9/30038
Instructions to perform operations on packed data, e.g. vector, tile or matrix operations: using a mask