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为什么在rts2800_fpu32.lib、rts2800_fpu32_fast_supplement.lib浮点库中sqrt()函数运行时间不手册描述的不一致?

我在使用sqrt函数的时候使用CCS中Colck功能查看实际好时是59 cpu clock,但是在手册上描述的是28个cpu clock,两者相差较大。在测试isqrt的时候实测的是27 cpu clock与手册中藐视的25cpu clock比较接近。请问这是怎么回事?这是maps文件: