intrins.h

一般_nop_();空指令啊，最常用的就是这个了，还有移位的时候extern void          _nop_     (void);extern bit           _testbit_ (bit);extern unsigned char _cror_    (unsigned char, unsigned char);extern unsigned int  _iror_    (unsigned int,  unsigned char);extern unsigned long _lror_    (unsigned long, unsigned char);extern unsigned char _crol_    (unsigned char, unsigned char);extern unsigned int  _irol_    (unsigned int,  unsigned char);extern unsigned long _lrol_    (unsigned long, unsigned char);extern unsigned char _chkfloat_(float);extern void          _push_    (unsigned char _sfr);extern void          _pop_     (unsigned char _sfr);这个头文件就几个函数，后面的两个堆栈的。中间的_irol__是移位啊。