Compare Intrinsics

The Intel® Streaming SIMD Extensions 2 (Intel® SSE2) intrinsics for integer comparison operations are listed in this topic. The prototypes for the Intel® SSE2 intrinsics are in the emmintrin.h header file.

The results of each intrinsic operation are placed in registers. The information about what is placed in each register appears in the tables below, in the detailed explanation of each intrinsic. R, R0, R1...R15 represent the registers in which results are placed.

Intrinsic Name	Operation	Corresponding Intel® SSE2 Instruction
_mm_cmpeq_epi8	Equality	PCMPEQB
_mm_cmpeq_epi16	Equality	PCMPEQW
_mm_cmpeq_epi32	Equality	PCMPEQD
_mm_cmpgt_epi8	Greater Than	PCMPGTB
_mm_cmpgt_epi16	Greater Than	PCMPGTW
_mm_cmpgt_epi32	Greater Than	PCMPGTD
_mm_cmplt_epi8	Less Than	PCMPGTBr
_mm_cmplt_epi16	Less Than	PCMPGTWr
_mm_cmplt_epi32	Less Than	PCMPGTDr

__m128i _mm_cmpeq_epi8(__m128i a, __m128i b)

Compares the 16 signed or unsigned 8-bit integers in a and the 16 signed or unsigned 8-bit integers in b for equality.

R0	R1	...	R15
(a0 == b0) ? 0xff : 0x0	(a1 == b1) ? 0xff : 0x0	...	(a15 == b15) ? 0xff : 0x0

__m128i _mm_cmpeq_epi16(__m128i a, __m128i b)

Compares the 8 signed or unsigned 16-bit integers in a and the 8 signed or unsigned 16-bit integers in b for equality.

R0	R1	...	R7
(a0 == b0) ? 0xffff : 0x0	(a1 == b1) ? 0xffff : 0x0	...	(a7 == b7) ? 0xffff : 0x0

__m128i _mm_cmpeq_epi32(__m128i a, __m128i b)

Compares the 4 signed or unsigned 32-bit integers in a and the 4 signed or unsigned 32-bit integers in b for equality.

R0	R1	R2	R3
(a0 == b0) ? 0xffffffff : 0x0	(a1 == b1) ? 0xffffffff : 0x0	(a2 == b2) ? 0xffffffff : 0x0	(a3 == b3) ? 0xffffffff : 0x0

__m128i _mm_cmpgt_epi8(__m128i a, __m128i b)

Compares the 16 signed 8-bit integers in a and the 16 signed 8-bit integers in b for greater than.

R0	R1	...	R15
(a0 > b0) ? 0xff : 0x0	(a1 > b1) ? 0xff : 0x0	...	(a15 > b15) ? 0xff : 0x0

__m128i _mm_cmpgt_epi16(__m128i a, __m128i b)

Compares the 8 signed 16-bit integers in a and the 8 signed 16-bit integers in b for greater than.

R0	R1	...	R7
(a0 > b0) ? 0xffff : 0x0	(a1 > b1) ? 0xffff : 0x0	...	(a7 > b7) ? 0xffff : 0x0

__m128i _mm_cmpgt_epi32(__m128i a, __m128i b)

Compares the 4 signed 32-bit integers in a and the 4 signed 32-bit integers in b for greater than.

R0	R1	R2	R3
(a0 > b0) ? 0xffffffff : 0x0	(a1 > b1) ? 0xffffffff : 0x0	(a2 > b2) ? 0xffffffff : 0x0	(a3 > b3) ? 0xffffffff : 0x0

__m128i _mm_cmplt_epi8( __m128i a, __m128i b)

Compares the 16 signed 8-bit integers in a and the 16 signed 8-bit integers in b for less than.

R0	R1	...	R15
(a0 < b0) ? 0xff : 0x0	(a1 < b1) ? 0xff : 0x0	...	(a15 < b15) ? 0xff : 0x0

__m128i _mm_cmplt_epi16( __m128i a, __m128i b)

Compares the 8 signed 16-bit integers in a and the 8 signed 16-bit integers in b for less than.

R0	R1	...	R7
(a0 < b0) ? 0xffff : 0x0	(a1 < b1) ? 0xffff : 0x0	...	(a7 < b7) ? 0xffff : 0x0

__m128i _mm_cmplt_epi32( __m128i a, __m128i b)

Compares the 4 signed 32-bit integers in a and the 4 signed 32-bit integers in b for less than.

R0	R1	R2	R3
(a0 < b0) ? 0xffffffff : 0x0	(a1 < b1) ? 0xffffffff : 0x0	(a2 < b2) ? 0xffffffff : 0x0	(a3 < b3) ? 0xffffffff : 0x0