1. A computer system that is configured to perform the following: dividing a set of computer instructions arranged in a sequential program order into a plurality of instruction sequences, wherein instructions within each sequence are arranged according to the program order; assigning an increment value to a preceding instruction in each sequence, wherein the increment value is equal to a difference between a program order value of a subsequent instruction in the sequence and a program order value of the preceding instruction; and at a processor of the system, calculating the program order value of each subsequent instruction based on the program order value and the increment value of a corresponding preceding instruction in the same sequence.