<builtin.h>

The <builtin.h> include file declares the following built-in and intrinsic functions:

_alloca _facos _fsincos _lrotl _rotl
_clear87 _fasin _fyl2x _llrotl _rotr
_control87 _fcos _fyl2xp1 _lrotr _srotl
_crotl _fcossin _f2xm1 _llrotr _srotr
_crotr _fpatan _inp __lxchg __sxchg
__cxchg _fptan _inpd _outp _status87
_disable _fsin _inpw _outpd _parmdwords
_enable _rsqrt _interrupt _outpw  

_clear87, _control87, and _status87 are also defined in <float.h>. _alloca is also defined in <stdlib.h> and <malloc.h>.

The functions _inp, _inpd, _inpw, _outp, _outpd, and _outpw are also defined in <conio.h>.

<builtin.h> also includes a declaration for the type size_t.



<conio.h>
<malloc.h>
<stdlib.h>