Miscellaneous Intrinsics

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

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

Intrinsic	Operation	Corresponding Intel® SSE 2 Instruction
_mm_packs_epi16	Packed Saturation	PACKSSWB
_mm_packs_epi32	Packed Saturation	PACKSSDW
_mm_packus_epi16	Packed Saturation	PACKUSWB
_mm_extract_epi16	Extraction	PEXTRW
_mm_insert_epi16	Insertion	PINSRW
_mm_movemask_epi8	Mask Creation	PMOVMSKB
_mm_shuffle_epi32	Shuffle	PSHUFD
_mm_shufflehi_epi16	Shuffle	PSHUFHW
_mm_shufflelo_epi16	Shuffle	PSHUFLW
_mm_unpackhi_epi8	Interleave	PUNPCKHBW
_mm_unpackhi_epi16	Interleave	PUNPCKHWD
_mm_unpackhi_epi32	Interleave	PUNPCKHDQ
_mm_unpackhi_epi64	Interleave	PUNPCKHQDQ
_mm_unpacklo_epi8	Interleave	PUNPCKLBW
_mm_unpacklo_epi16	Interleave	PUNPCKLWD
_mm_unpacklo_epi32	Interleave	PUNPCKLDQ
_mm_unpacklo_epi64	Interleave	PUNPCKLQDQ
_mm_movepi64_pi64	Move	MOVDQ2Q
_mm_movpi64_epi64	Move	MOVDQ2Q
_mm_move_epi64	Move	MOVQ
_mm_unpackhi_pd	Interleave	UNPCKHPD
_mm_unpacklo_pd	Interleave	UNPCKLPD
_mm_movemask_pd	Create mask	MOVMSKPD
_mm_shuffle_pd	Select values	SHUFPD

__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.

R0	...	R7	R8	...	R15
Signed Saturate(a0)	...	Signed Saturate(a7)	Signed Saturate(b0)	...	Signed Saturate(b7)

__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.

R0	...	R3	R4	...	R7
Signed Saturate(a0)	...	Signed Saturate(a3)	Signed Saturate(b0)	...	Signed Saturate(b3)

__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.

R0	...	R7	R8	...	R15
Unsigned Saturate(a0)	...	Unsigned Saturate(a7)	Unsigned Saturate(b0)	...	Unsigned Saturate(b15)

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.

R0
(imm == 0) ? a0: ( (imm == 1) ? a1: ... (imm==7) ? a7)

__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.

R0	R1	...	R7
(imm == 0) ? b : a0;	(imm == 1) ? b : a1;	...	(imm == 7) ? b : a7;

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.

R0
a15[7] << 15 \| a14[7] << 14 \| ... a1[7] << 1 \| a0[7]

__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.

R0	R1	R2	R3	...	R14	R15
a8	b8	a9	b9	...	a15	b15

__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.

R0	R1	R2	R3	R4	R5	R6	R7
a4	b4	a5	b5	a6	b6	a7	b7

__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.

R0	R1	R2	R3
a2	b2	a3	b3

__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.

R0	R1
a1	b1

__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.

R0	R1	R2	R3	...	R14	R15
a0	b0	a1	b1	...	a7	b7

__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.

R0	R1	R2	R3	R4	R5	R6	R7
a0	b0	a1	b1	a2	b2	a3	b3

__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.

R0	R1	R2	R3
a0	b0	a1	b1

__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.

R0	R1
a0	b0

__m64 _mm_movepi64_pi64(__m128i a)

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

R0
a0

__m128i _mm_movpi64_pi64(__m64 a)

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

R0	R1
a0	0X0

__m128i _mm_move_epi64(__m128i a)

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

R0	R1
a0	0X0

__m128d _mm_unpackhi_pd(__m128d a, __m128d b)

Interleaves the upper DP FP values of a and b.

R0	R1
a1	b1

__m128d _mm_unpacklo_pd(__m128d a, __m128d b)

Interleaves the lower DP FP values of a and b.

R0	R1
a0	b0

int _mm_movemask_pd(__m128d a)

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

R
sign(a1) << 1 \| sign(a0)

__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.