MS provide some intrinsic functions for low level operations (eg. firmware/driver) on their compiler that is very convenience. You don't have to include the any header file to make use of these functions. But you have to specify a compiler option "/Oi".
example:
#progma intrinsic (func1)
#progma intrinsic (func2, func3)
Below are some of intrinsic functions
_disable
_outp
fabs
strcmp
_enable
_outpw
labs
strcpy
_inp
_rotl
memcmp
strlen
_inpw
_rotr
memcpy
_lrotl
_strset
memset
_lrotr
abs
strcat
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