Developer Guide and Reference

Contents

_mm256_cmpeq_epi8/16/32/64

Compares packed bytes/words/doublewords/quadwords of two source vectors. The corresponding Intel® AVX2 instruction is
VPCMPEQB
,
VPCMPEQW
,
VPCMPEQD
, or
VPCMPEQQ
.

Syntax

extern __m256i _mm256_cmpeq_epi8(__m256i s1, __m256i s2);
extern __m256i _mm256_cmpeq_epi16(__m256i s1, __m256i s2);
extern __m256i _mm256_cmpeq_epi32(__m256i s1, __m256i s2);
extern __m256i _mm256_cmpeq_epi64(__m256i s1, __m256i s2);
Arguments
s1
integer source vector used for the operation
s2
integer source vector used for the operation
Description
Performs a SIMD compare for equality of packed bytes, words, doublewords, or quadwords in source vectors
s1
and
s2
. If a pair of data elements is equal, the corresponding data element in the destination vector is set to all 1s. If a pair of data elements is unequal, the corresponding data element in the destination vector is set to 0.
Returns
Destination vector with result of the compare equal operation.

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804