A 64-bit fixed-point trigonometric function operation method of an ARM processor

Abstract

The application discloses a 64-bit fixed-point trigonometric function operation method of an ARM processor, which comprises the following steps: firstly, defining a 64-bit fixed-point number and a data type conversion mechanism; defining a sin trigonometric function table based on a 32-bit fixed-point number and storing the table in the form of integer data; secondly, converting a floating-point number to be operated into a 64-bit fixed-point number, performing a modulus operation on the 64-bit fixed-point number and a 64-bit fixed-point number form of π / 2, obtaining a trigonometric function variable, representing the variable in the form of integer data, and then incrementally searching a table to obtain a sin value of the converted 32-bit fixed-point number in the sin trigonometric function table; using the 64-bit fixed-point number to represent and using linear interpolation to compensate the value of the lower 16 bits of the decimal point, so as to obtain a sin value corresponding to the 64-bit fixed-point number; and finally, according to the sin value, using a trigonometric function transformation formula to calculate the values of trigonometric functions cos and tan. The operation method can realize high-precision decimal trigonometric function operation with high operation speed in the ARM processor.

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