MMX Technology General Support Intrinsics

Microsoft Specific

The intrinsics listed in the following table are followed by a description of each intrinsic.

MMX intrinsics use the __m64 data type, which is not supported on x64 processors.

The header file mmintrin.h contains the declarations for the MMX intrinsics.

General Support Intrinsics

Intrinsic name	Operation	Signed	Saturation	Assembly instruction
_mm_empty	Empties MM state	Not applicable	Not applicable	EMMS
_mm_cvtsi32_si64	Converts from int	Not applicable	Not applicable	MOVD
_mm_cvtsi64_si32	Converts from int	Not applicable	Not applicable	MOVD
_mm_packs_pi16	Packs	Yes	Yes	PACKSSWB
_mm_packs_pi32	Packs	Yes	Yes	PACKSSDW
_mm_packs_pu16	Packs	No	Yes	PACKUSWB
_mm_unpackhi_pi8	Interleaves	Not applicable	Not applicable	PUNPCKHBW
_mm_unpackhi_pi16	Interleaves	Not applicable	Not applicable	PUNPCKHWD
_mm_unpackhi_pi32	Interleaves	Not applicable	Not applicable	PUNPCKHDQ
_mm_unpacklo_pi8	Interleaves	Not applicable	Not applicable	PUNPCKLBW
_mm_unpacklo_pi16	Interleaves	Not applicable	Not applicable	PUNPCKLWD
_mm_unpacklo_pi32	Interleaves	Not applicable	Not applicable	PUNPCKLDQ

See Also