Compare Intrinsics

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

To use these intrinsics, include the immintrin.h file as follows:

#include <immintrin.h>

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

_mm_cmpeq_epi8

__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

_mm_cmpeq_epi16

__m128i _mm_cmpeq_epi16(__m128i a, __m128i b);

Compares the eight signed or unsigned 16-bit integers in a and the eight 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

_mm_cmpeq_epi32

__m128i _mm_cmpeq_epi32(__m128i a, __m128i b);

Compares the four signed or unsigned 32-bit integers in a and the four 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

_mm_cmpgt_epi8

__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

_mm_cmpgt_epi16

__m128i _mm_cmpgt_epi16(__m128i a, __m128i b);

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

R0

R1

...

R7

(a0 > b0) ? 0xffff : 0x0

(a1 > b1) ? 0xffff : 0x0

...

(a7 > b7) ? 0xffff : 0x0

_mm_cmpgt_epi32

__m128i _mm_cmpgt_epi32(__m128i a, __m128i b);

Compares the four signed 32-bit integers in a and the four 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

_mm_cmplt_epi8

__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

_mm_cmplt_epi16

__m128i _mm_cmplt_epi16( __m128i a, __m128i b);

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

R0

R1

...

R7

(a0 < b0) ? 0xffff : 0x0

(a1 < b1) ? 0xffff : 0x0

...

(a7 < b7) ? 0xffff : 0x0

_mm_cmplt_epi32

__m128i _mm_cmplt_epi32( __m128i a, __m128i b);

Compares the four signed 32-bit integers in a and the four 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

Para obtener información más completa sobre las optimizaciones del compilador, consulte nuestro Aviso de optimización.