# Miscellaneous Intrinsics

The intrinsics listed here are designed for the Intel® Pentium® 4 processor with Streaming SIMD Extensions 3 (Intel® SSE3). The prototypes for these intrinsics are in the pmmintrin.h header file.

To use these intrinsics, include the immintrin.h file as follows:

    #include <immintrin.h>

## _mm_monitor

extern void _mm_monitor(void const *p, unsigned extensions, unsigned hints);

Generates the `MONITOR` instruction. This sets up an address range for the monitor hardware using p to provide the logical address, and will be passed to the monitor instruction in register EAX. The extensions parameter contains optional extensions to the monitor hardware which will be passed in ECX. The hints parameter will contain hints to the monitor hardware, which will be passed in EDX. A non-zero value for extensions will cause a general protection fault.

## _mm_mwait

extern void _mm_mwait(unsigned extensions, unsigned hints);

Generates the `MWAIT` instruction. This instruction is a hint that allows the processor to stop execution and enter an implementation-dependent optimized state until occurrence of a class of events. In future processor designs, extensions and hints parameters may be used to convey additional information to the processor. All non-zero values of extensions and hints are reserved. A non-zero value for extensions will cause a general protection fault.

Parent topic: Intrinsics for Intel® Streaming SIMD Extensions 3 (Intel® SSE3)