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关于C6678的MATHLIB中的库函数的问题

Other Parts Discussed in Thread: MATHLIB

mathlib_c66x_3_0_1_1:

请问大神们,MATHLIB的库函数为什么每个都有四种?

比如说单精度的Atansp就有这四种:

(1)float   atansp(float a)

(2)float   atansp_c(float a)

(3) atansp_i

(4) atansp_v

这四种有什么区别?

O(∩_∩)O谢谢