Developer Guide and Reference

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_mm256_alignr_epi8

Aligns elements of two source vectors depending on bits in a mask. The corresponding Intel® AVX2 instruction is
VPALIGNR
.

Syntax

extern __m256i _mm256_alignr_epi8(__m256i s1, __m256i s2, const int mask);
Arguments
s1
integer source vector used for the operation
s2
integer source vector used for the operation
mask
8-bit immediate bits used for the operation
Description
Performs an alignment operation by concatenating two blocks of 16-byte data from the first and second source vectors,
s1
and
s2
, into an intermediate 32-byte composite, shifting the composite at byte granularity to the right by a constant immediate specified by mask, and extracting the right-aligned 16-byte result into the destination vector. The immediate value is considered unsigned.
Returns
Result of the alignment operation.