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_spint是内嵌函数，是直接映射到汇编指令的，所以没有c源码，请看下面对Intrinsics函数的定义。
What are C Intrinsics ?
• Special C function calls that the TI compiler recognizes and then maps
directly into inline assembly instructions processors.wiki.ti.com/.../Run_Intrinsics_Code_Anywhere
对Intrinsics函数定义的描述可以参考相应的compiler编译器手册8.6.6 Using Intrinsics to Access Assembly Language Statements。 www.ti.com/.../sprui04c.pdf
