快速浮点库 c674xfastMath v3.0版本以后更名成了 MathLib
http://software-dl.ti.com/sdoemb/sdoemb_public_sw/mathlib/latest/index_FDS.html
MATHLIB contains optimized versions of most floating-point math routines currently provided in existing run-time-support libraries.
MATHLIB RTS override library contains floating-point math routines with same symbol names as in run-time-support library. These routines can be used to replace existing run-time-support library function calls.
从说明中并没看出两者有什么区别。但从Test Report中的数据来看，两者运行效率似乎不一样。应该怎么作选择？
