# _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.

Parent topic: Intrinsics for Compare Operations