Conditional modular subtraction instruction

An apparatus comprising:

• decoder circuitry to decode an instruction, the instruction to include a field for an identifier of a first source packed data operand having a first plurality of integer data elements, a field for an identifier of a second source packed data operand having a second plurality of integer data elements, and a field for an opcode, the opcode to indicate execution circuitry is to perform a conditional subtraction operations on the first source packed data operand and the second source packed data operand;
• and
• the execution circuitry to perform the conditional subtraction operations according to the opcode, including to perform the conditional subtraction operations in parallel on each integer data element of the first plurality of integer data elements and corresponding integer data elements of the second plurality of integer data elements, the execution circuitry including:
• a first circuit to generate subtraction results based on integer data element of the first plurality of integer data elements minus corresponding integer data elements of the second plurality of integer data elements and status flags to indicate signs of the subtraction results;
• and
• a second circuit to output the integer data elements of the first plurality of integer data elements when the status flags indicate that the subtraction results are negative and otherwise to output the subtraction results.

A processor comprising:

• first circuitry to decode an instruction, the instruction to indicate a first source packed data operand and a second source operand, the first source packed data operand to have a first plurality of integer data elements and the second source operand to have an integer data element;
• and
• second circuitry including a processing resource to perform operations corresponding to the instruction, including to:
• determine whether each integer data element of the first plurality of integer data elements is greater than or equal to the integer data element of the second source operand;
• for each integer data element of the first plurality of integer data elements that is greater than or equal to the integer data element of the second source operand, output a corresponding result data element in a result packed data that is equal to the integer data element of the first plurality of integer data elements minus the integer data element of the second source operand;
• and
• for each integer data element of the first plurality of integer data elements that is not greater than or equal to the integer data element of the second source operand, output the corresponding integer data element of the first plurality of integer data elements as a corresponding result data element in the result packed data.