Since the functions and interfaces of the domestic Shenwei basic math library need to be consistent with the libm library of the stand-alone compiler glibc, the basic math library is integrated into glibc for functional tests. Nevertheless, it is detected that some functions have inexact exception (INE) that needs to be eliminated. In response, this study investigates the exception detection mechanism of the glibc math library, analyzes and optimizes the INE of the numerical functions in the basic math library, and proposes a segmentation processing method for test data sets. In this way, such INE is eliminated. Tests show that the segmentation processing method for test data sets can effectively solve the INE of the numerical functions. Compared with the previous exception processing method, the proposed method improves the average performance speedup to 148%.