MMX™ Technology General Support Intrinsics

The prototypes for MMX™ technology general support intrinsics are in the mmintrin.h header file.

Intrinsic Name	Operation	Corresponding MMX™ Instruction
_mm_empty	Empty MM state	EMMS
_mm_cvtsi32_si64	Convert from int	MOVD
_mm_cvtsi64_si32	Convert to int	MOVD
_mm_cvtsi64_m64	Convert from __int64	MOVQ
_mm_cvtm64_si64	Convert to __int64	MOVQ
_mm_packs_pi16	Pack	PACKSSWB
_mm_packs_pi32	Pack	PACKSSDW
_mm_packs_pu16	Pack	PACKUSWB
_mm_unpackhi_pi8	Interleave	PUNPCKHBW
_mm_unpackhi_pi16	Interleave	PUNPCKHWD
_mm_unpackhi_pi32	Interleave	PUNPCKHDQ
_mm_unpacklo_pi8	Interleave	PUNPCKLBW
_mm_unpacklo_pi16	Interleave	PUNPCKLWD
_mm_unpacklo_pi32	Interleave	PUNPCKLDQ

_mm_empty

void _mm_empty(void);

Empties the multimedia state.

_mm_cvtsi32_si64

__m64 _mm_cvtsi32_si64(int i);

Converts the integer object i to a 64-bit __m64 object. The integer value is zero-extended to 64 bits.

_mm_cvtsi64_si32

int _mm_cvtsi64_si32(__m64 m);

Converts the lower 32 bits of the __m64 object m to an integer.

_mm_cvtsi64_m64

__m64 _mm_cvtsi64_m64(__int64 i);

Moves the 64-bit integer object i to a __m64 object

_mm_cvtm64_si64

__m64 _mm_cvtm64_si64(__m64 m);

Moves the __m64 object m to a 64-bit integer

_mm_packs_pi16

__m64 _mm_packs_pi16(__m64 m1, __m64 m2);

Packs the four 16-bit values from m1 into the lower four 8-bit values of the result with signed saturation, and pack the four 16-bit values from m2 into the upper four 8-bit values of the result with signed saturation.

_mm_packs_pi32

__m64 _mm_packs_pi32(__m64 m1, __m64 m2);

Packs the two 32-bit values from m1 into the lower two 16-bit values of the result with signed saturation, and pack the two 32-bit values from m2 into the upper two 16-bit values of the result with signed saturation.

_mm_packs_pu16

__m64 _mm_packs_pu16(__m64 m1, __m64 m2);

Packs the four 16-bit values from m1 into the lower four 8-bit values of the result with unsigned saturation, and pack the four 16-bit values from m2 into the upper four 8-bit values of the result with unsigned saturation.

_mm_unpackhi_pi8

__m64 _mm_unpackhi_pi8(__m64 m1, __m64 m2);

Interleaves the four 8-bit values from the high half of m1 with the four values from the high half of m2. The interleaving begins with the data from m1.

_mm_unpackhi_pi16

__m64 _mm_unpackhi_pi16(__m64 m1, __m64 m2);

Interleaves the two 16-bit values from the high half of m1 with the two values from the high half of m2. The interleaving begins with the data from m1.

_mm_unpackhi_pi32

__m64 _mm_unpackhi_pi32(__m64 m1, __m64 m2);

Interleaves the 32-bit value from the high half of m1 with the 32-bit value from the high half of m2. The interleaving begins with the data from m1.

_mm_unpacklo_pi8

__m64 _mm_unpacklo_pi8(__m64 m1, __m64 m2);

Interleaves the four 8-bit values from the low half of m1 with the four values from the low half of m2. The interleaving begins with the data from m1.

_mm_unpacklo_pi16

__m64 _mm_unpacklo_pi16(__m64 m1, __m64 m2);

Interleaves the two 16-bit values from the low half of m1 with the two values from the low half of m2. The interleaving begins with the data from m1.

_mm_unpacklo_pi32

__m64 _mm_unpacklo_pi32(__m64 m1, __m64 m2);

Interleaves the 32-bit value from the low half of m1 with the 32-bit value from the low half of m2. The interleaving begins with the data from m1.