The prototypes for MMX™ technology intrinsics are in the mmintrin.h header file.
To see detailed information about an intrinsic, click on that intrinsic in the following table.
| 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 |
void _mm_empty(void)
Empty the multimedia state.
__m64 _mm_cvtsi32_si64(int i)
Convert the integer object i to a 64-bit __m64 object. The integer value is zero-extended to 64 bits.
int _mm_cvtsi64_si32(__m64 m)
Convert the lower 32 bits of the __m64 object m to an integer.
__m64 _mm_cvtsi64_m64(__int64 i)
Move the 64-bit integer object i to a __mm64 object
__int64 _mm_cvtm64_si64(__m64 m)
Move the __m64 object m to a 64-bit integer
__m64 _mm_packs_pi16(__m64 m1, __m64 m2)
Pack 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.
__m64 _mm_packs_pi32(__m64 m1, __m64 m2)
Pack 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.
__m64 _mm_packs_pu16(__m64 m1, __m64 m2)
Pack 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.
__m64 _mm_unpackhi_pi8(__m64 m1, __m64 m2)
Interleave 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.
__m64 _mm_unpackhi_pi16(__m64 m1, __m64 m2)
Interleave 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.
__m64 _mm_unpackhi_pi32(__m64 m1, __m64 m2)
Interleave 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.
__m64 _mm_unpacklo_pi8(__m64 m1, __m64 m2)
Interleave 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.
__m64 _mm_unpacklo_pi16(__m64 m1, __m64 m2)
Interleave 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.
__m64 _mm_unpacklo_pi32(__m64 m1, __m64 m2)
Interleave 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.