Miscellaneous Operations for Streaming SIMD Extensions 2

The miscellaneous intrinsics for Streaming SIMD Extensions 2 (SSE2) are listed in the following table followed by their descriptions.

The prototypes for SSE2 intrinsics are in the emmintrin.h header file.

__m128i _mm_packs_epi16(__m128i a, __m128i b)

Packs the 16 signed 16-bit integers from a and b into 8-bit integers and saturates.

__m128i _mm_packs_epi32(__m128i a, __m128i b)

Packs the 8 signed 32-bit integers from a and b into signed 16-bit integers and saturates.

__m128i _mm_packus_epi16(__m128i a, __m128i b)

Packs the 16 signed 16-bit integers from a and b into 8-bit unsigned integers and saturates.

int _mm_extract_epi16(__m128i a, int imm)

Extracts the selected signed or unsigned 16-bit integer from a and zero extends. The selector imm must be an immediate.

__m128i _mm_insert_epi16(__m128i a, int b, int imm)

Inserts the least significant 16 bits of b into the selected 16-bit integer of a. The selector imm must be an immediate.

int _mm_movemask_epi8(__m128i a)

Creates a 16-bit mask from the most significant bits of the 16 signed or unsigned 8-bit integers in a and zero extends the upper bits.

__m128i _mm_shuffle_epi32(__m128i a, int imm)

Shuffles the 4 signed or unsigned 32-bit integers in a as specified by imm. The shuffle value, imm, must be an immediate. See Macro Function for Shuffle for a description of shuffle semantics.

__m128i _mm_shufflehi_epi16(__m128i a, int imm)

Shuffles the upper 4 signed or unsigned 16-bit integers in a as specified by imm. The shuffle value, imm, must be an immediate. See Macro Function for Shuffle for a description of shuffle semantics.

__m128i _mm_shufflelo_epi16(__m128i a, int imm)

Shuffles the lower 4 signed or unsigned 16-bit integers in a as specified by imm. The shuffle value, imm, must be an immediate. See Macro Function for Shuffle for a description of shuffle semantics.

__m128i _mm_unpackhi_epi8(__m128i a, __m128i b)

Interleaves the upper 8 signed or unsigned 8-bit integers in a with the upper 8 signed or unsigned 8-bit integers in b.

__m128i _mm_unpackhi_epi16(__m128i a, __m128i b)

Interleaves the upper 4 signed or unsigned 16-bit integers in a with the upper 4 signed or unsigned 16-bit integers in b.

__m128i _mm_unpackhi_epi32(__m128i a, __m128i b)

Interleaves the upper 2 signed or unsigned 32-bit integers in a with the upper 2 signed or unsigned 32-bit integers in b.

__m128i _mm_unpackhi_epi64(__m128i a, __m128i b)

Interleaves the upper signed or unsigned 64-bit integer in a with the upper signed or unsigned 64-bit integer in b.

__m128i _mm_unpacklo_epi8(__m128i a, __m128i b)

Interleaves the lower 8 signed or unsigned 8-bit integers in a with the lower 8 signed or unsigned 8-bit integers in b.

__m128i _mm_unpacklo_epi16(__m128i a, __m128i b)

Interleaves the lower 4 signed or unsigned 16-bit integers in a with the lower 4 signed or unsigned 16-bit integers in b.

__m128i _mm_unpacklo_epi32(__m128i a, __m128i b)

Interleaves the lower 2 signed or unsigned 32-bit integers in a with the lower 2 signed or unsigned 32-bit integers in b.

__m128i _mm_unpacklo_epi64(__m128i a, __m128i b)

Interleaves the lower signed or unsigned 64-bit integer in a with the lower signed or unsigned 64-bit integer in b.

__m64 _mm_movepi64_pi64(__m64 a)

Returns the lower 64 bits of a as an __m64 type.

__128i _mm_movpi64_pi64(__m128i a)

Moves the 64 bits of a to the lower 64 bits of the result, zeroing the upper bits.

__128i _mm_move_epi64(__128i a)

Moves the lower 64 bits of a to the lower 64 bits of the result, zeroing the upper bits.

__m128d _mm_unpackhi_pd(__m128d a, __m128d b)

Interleaves the upper DP FP values of a and b.

__m128d _mm_unpacklo_pd(__m128d a, __m128d b)

Interleaves the lower DP FP values of a and b.

int _mm_movemask_pd(__m128d a)

Creates a two-bit mask from the sign bits of the two DP FP values of a.

__m128d _mm_shuffle_pd(__m128d a, __m128d b, int i)

Selects two specific DP FP values from a and b, based on the mask i. The mask must be an immediate. See Macro Function for Shuffle for a description of the shuffle semantics.