Developer Guide and Reference

Contents

_mm256_unpacklo_epi8/16/32/64

Unpacks and interleaves the low-order data elements of the source vector with the low-order data elements in the destination vector. The corresponding Intel® AVX2 instruction is
VPUNPCKLBW
,
VPUNPCKLWD
,
VPUNPCKLDQ
, or
VPUNPCKLQDQ
.

Syntax

extern __m256i _mm256_unpacklo_epi8(__m256i a, __m256i b);
extern __m256i _mm256_unpacklo_epi16(__m256i a, __m256i b);
extern __m256i _mm256_unpacklo_epi32(__m256i a, __m256i b);
extern __m256i _mm256_unpacklo_epi64(__m256i a, __m256i b);
Arguments
a
integer source vector used for the operation
b
integer source vector used for the operation
Description
Unpacks and interleaves the low-order signed or unsigned data elements (bytes, words, doublewords, and quadwords) of the source vector and the low-order signed or unsigned data elements (bytes, words, doublewords, and quadwords) in the destination operand. The high-order data elements are ignored.
Returns
Result of the interleave 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