US 2014/0280414 A1Published application

Instruction for performing a pseudorandom number seed operation

AssigneeInternational Business Machines Corporation

InventorsDan F. Greiner, Bernd Nerz, Tamas Visegrady

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Abstract

A machine instruction is provided that includes an opcode field to provide an opcode, the opcode to identify a perform pseudorandom number operation, and a register field to be used to identify a register, the register to specify a location in memory of a second operand to be used. The machine instruction is executed, and execution includes obtaining a modifier field of a register associated with the machine instruction; based on the modifier field having a first value, performing a deterministic pseudorandom number seed operation, which includes obtaining seed material based on information stored in the second operand; using a 512 bit secure hash technique and the seed material to provide one or more seed values; and storing the one or more seed values in a parameter block.

Claims20

Dependent claims

A computer program product for executing a machine instruction, the computer program product comprising:

a 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:
an opcode field to provide an opcode, the opcode to identify a perform pseudorandom number operation;
and
a register field to be used to identify a register, the register to specify a location in memory of a second operand to be used by the machine instruction;
and
executing the machine instruction, the executing comprising:
obtaining a modifier (M) field of a register associated with the machine instruction;
based on the M field having a first value, performing a deterministic pseudorandom number seed operation, the deterministic pseudorandom number seed operation comprising:
obtaining seed material based on information included in the second operand;
using a 512 bit secure hash technique and the seed material to provide one or more seed values;
and
storing the one or more seed values in a parameter block associated with the machine instruction.

10 more elements

A computer system for executing a machine instruction, 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:
an opcode field to provide an opcode, the opcode to identify a perform pseudorandom number operation;
and
a register field to be used to identify a register, the register to specify a location in memory of a second operand to be used by the machine instruction;
and
executing the machine instruction, the executing comprising:
obtaining a modifier (M) field of a register associated with the machine instruction;
based on the M field having a first value, performing a deterministic pseudorandom number seed operation, the deterministic pseudorandom number seed operation comprising:
obtaining seed material based on information included in the second operand;
using a 512 bit secure hash technique and the seed material to provide one or more seed values;
and
storing the one or more seed values in a parameter block associated with the machine instruction.

12 more elements

A method of executing a machine instruction, the 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:
an opcode field to provide an opcode, the opcode to identify a perform pseudorandom number operation;
and
a register field to be used to identify a register, the register to specify a location in memory of a second operand to be used by the machine instruction;
and
executing the machine instruction, the executing comprising:
obtaining a modifier (M) field of a register associated with the machine instruction;
based on the M field having a first value, performing a deterministic pseudorandom number seed operation, the deterministic pseudorandom number seed operation comprising:
obtaining seed material based on information included in the second operand;
using a 512 bit secure hash technique and the seed material to provide one or more seed values;
and
storing the one or more seed values in a parameter block associated with the machine instruction.

9 more elements

Dependencies are inferred from the claim text.