Hexadecimal floating point multiply and add instruction

A computer system for facilitating processing within a computing environment, the computer system comprising:

• a memory;
• and
• a processor in communication with the memory, wherein the computer system is configured to perform a method, said method comprising:
• executing an instruction to perform an operation selected from a plurality of operations configured for the instruction, the instruction including an operation code field indicating an operation to be performed and a field separate from the operation code field used to specify a control to be used in execution of the instruction, and wherein the executing the instruction comprises:
• determining a value of a selected operand of the instruction, wherein the determining the value of the selected operand of the instruction is based on the control specified using the field of the instruction, wherein the control is set to one control value of multiple control values configured for the control, the multiple control values including a first value and a second value, and wherein the determining the value of the selected operand of the instruction comprises:
• reading the selected operand of the instruction from a selected operand location to obtain the value of the selected operand, based on the control of the instruction having the first value;
• and
• using a predetermined value as the value of the selected operand, based on the control of the instruction having the second value;
• multiplying the value and another selected operand of the instruction to obtain a product;
• performing an arithmetic operation using the product and a chosen operand of the instruction to obtain an intermediate result;
• obtaining a result from the intermediate result;
• and
• placing the result in a selected location.

A computer-implemented method of facilitating processing within a computing environment, the computer-implemented method comprising:

• executing an instruction to perform an operation selected from a plurality of operations configured for the instruction, the instruction including an operation code field indicating an operation to be performed and a field separate from the operation code field used to specify a control to be used in execution of the instruction, and wherein the executing the instruction comprises:
• determining a value of a selected operand of the instruction, wherein the determining the value of the selected operand of the instruction is based on the control specified using the field of the instruction, wherein the control is set to one control value of multiple control values configured for the control, the multiple control values including a first value and a second value, and wherein the determining the value of the selected operand of the instruction comprises:
• reading the selected operand of the instruction from a selected operand location to obtain the value of the selected operand, based on the control of the instruction having the first value;
• and
• using a predetermined value as the value of the selected operand, based on the control of the instruction having the second value;
• multiplying the value and another selected operand of the instruction to obtain a product;
• performing an arithmetic operation using the product and a chosen operand of the instruction to obtain an intermediate result;
• obtaining a result from the intermediate result;
• and
• placing the result in a selected location.