### <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>