Apparatus and method for remote atomic floating point operations

A method, comprising:

• storing rounding mode control bits and denormal mode control bits in a control register of a logical processor of a core to indicate a-rounding mode and denormal value processing mode of the logical processor, respectively, to be used for floating-point operations;
• fetching, by the logical processor, a remote atomic operation (RAO) floating point (FP) instruction comprising an opcode indicating an FP math operation, at least one FP source value, and a memory location to store at least one FP result value;
• decoding, by the logical processor, the RAO FP instruction to produce a decoded RAO FP instruction comprising one or more microoperations;
• determining whether to offload the decoded RAO FP instruction to an execution engine external to the logical processor or to execute the decoded RAO FP instruction by execution circuitry of the logical processor;
• and
• determining to offload the decoded RAO FP instruction to the execution engine, wherein offloading the decoded RAO FP instruction includes transmitting a message to the execution engine indicating the FP math operation associated with the decoded RAO FP instruction, the at least one FP source value, and the memory location to store the at least one FP result value, and
• wherein the rounding mode control bits and the denormal mode control bits of the logical processor are to be communicated to the execution engine external to the logical processor in the message.

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

• storing rounding mode control bits and denormal mode control bits in a control register of a logical processor of a core to indicate a rounding mode and denormal value processing mode of the logical processor, respectively, to be used for floating-point operations;
• fetching, by the logical processor, a remote atomic operation (RAO) floating point (FP) instruction comprising an opcode indicating an FP math operation, at least one FP source value, and a memory location to store at least one FP result value;
• decoding, by the logical processor, the RAO FP instruction to produce a decoded RAO FP instruction comprising one or more microoperations;
• determining whether to offload the decoded RAO FP instruction to an execution engine external to the logical processor or to execute the decoded RAO FP instruction by execution circuitry of the logical processor;
• and
• determining to offload the decoded RAO FP instruction to the execution engine, wherein offloading the decoded RAO FP instruction includes transmitting a message to the execution engine indicating the FP math operation associated with the decoded RAO FP instruction, the at least one FP source value, and the memory location to store the at least one FP result value, and
• wherein the rounding mode control bits and the denormal mode control bits of the logical processor are to be communicated to the execution engine external to the logical processor in the message.