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US 9,804,840 B2Granted
Vector Galois Field Multiply Sum and Accumulate instruction
AssigneeInternational Business Machines Corporation
InventorJonathan D. Bradbury
Life of this patent
Estimating the term…
Abstract
A Vector Galois Field Multiply Sum and Accumulate instruction. Each element of a second operand of the instruction is multiplied in a Galois field with the corresponding element of the third operand to provide one or more products. The one or more products are exclusively ORed with each other and exclusively ORed with a corresponding element of a fourth operand of the instruction. The results are placed in a selected operand.
Claims17
A computer program product for executing a machine instruction in a central processing unit, the computer program product comprising:
- a non-transitory computer readable storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising:
- obtaining, by a processor, a machine instruction for execution, the machine instruction being defined for computer execution according to a computer architecture, the machine instruction comprising:
- at least one opcode field to provide an opcode, the opcode identifying a Vector Galois Field Multiply Sum and Accumulate operation;
- a first register field to be used to designate a first register, the first register comprising a first operand;
- a second register field to be used to designate a second register, the second register comprising a second operand;
- a third register field to be used to designate a third register, the third register comprising a third operand;
- a fourth register field to be used to designate a fourth register, the fourth register comprising a fourth operand;
- and
- a mask field to specify a size of elements of one or more of the first operand, the second operand, the third operand or the fourth operand, wherein the mask field specifies the size of the elements of the second operand and the third operand;
- and
- executing the machine instruction, the executing comprising:
- multiplying one or more elements of the second operand with one or more elements of the third operand using carryless multiplication to obtain a plurality of products;
- performing a first mathematical operation on the plurality of products to obtain a first result;
- performing a second mathematical operation on the first result and one or more selected elements of the fourth operand to obtain a second result;
- and
- placing the second result in the first operand.
13 more elements
A computer system for executing a machine instruction in a central processing unit, the computer system comprising:
- a memory;
- and
- a processor in communications with the memory, wherein the computer system is configured to perform a method, said method comprising:
- obtaining, by a processor, a machine instruction for execution, the machine instruction being defined for computer execution according to a computer architecture, the machine instruction comprising:
- at least one opcode field to provide an opcode, the opcode identifying a Vector Galois Field Multiply Sum and Accumulate operation;
- a first register field to be used to designate a first register, the first register comprising a first operand;
- a second register field to be used to designate a second register, the second register comprising a second operand;
- a third register field to be used to designate a third register, the third register comprising a third operand;
- a fourth register field to be used to designate a fourth register, the fourth register comprising a fourth operand;
- and
- a mask field to specify a size of elements of one or more of the first operand, the second operand, the third operand or the fourth operand, wherein the mask field specifies the size of the elements of the second operand and the third operand;
- and
- executing the machine instruction, the executing comprising:
- multiplying one or more elements of the second operand with one or more elements of the third operand using carryless multiplication to obtain a plurality of products;
- performing a first mathematical operation on the plurality of products to obtain a first result;
- performing a second mathematical operation on the first result and one or more selected elements of the fourth operand to obtain a second result;
- and
- placing the second result in the first operand.
15 more elements
A computer program product for executing a machine instruction in a central processing unit, the computer program product comprising:
- a non-transitory computer readable storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising:
- obtaining, by a processor, a machine instruction for execution, the machine instruction being defined for computer execution according to a computer architecture, the machine instruction comprising:
- at least one opcode field to provide an opcode, the opcode identifying a Vector Galois Field Multiply Sum and Accumulate operation;
- a first register field to be used to designate a first register, the first register comprising a first operand;
- a second register field to be used to designate a second register, the second register comprising a second operand;
- a third register field to be used to designate a third register, the third register comprising a third operand;
- a fourth register field to be used to designate a fourth register, the fourth register comprising a fourth operand;
- and
- an extension field to be used in designating one or more registers, wherein the first register field is combined with a first portion of the extension field to designate the first register, the second register field is combined with a second portion of the extension field to designate the second register, the third register field is combined with a third portion of the extension field to designate the third register, and the fourth register field is combined with a fourth portion of the extension field to designate the fourth register;
- and
- executing the machine instruction, the executing comprising:
- multiplying one or more elements of the second operand with one or more elements of the third operand using carryless multiplication to obtain a plurality of products;
- performing a first mathematical operation on the plurality of products to obtain a first result;
- performing a second mathematical operation on the first result and one or more selected elements of the fourth operand to obtain a second result;
- and
- placing the second result in the first operand.
13 more elements
Dependencies are inferred from the claim text.