Intel® C++ Compiler Classic Developer Guide and Reference

ID 767249
Date 12/16/2022
Public

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<span class='option'>_mm256_slli_epi16/32/64 </span>

Logical shift of word/doubleword/quadword elements to left according to specified number. The corresponding Intel® AVX2 instruction is VPSLLW, VPSLLD, or VPSLLQ.

Syntax

extern __m256i _mm256_slli_epi16(__m256i s1, int count);

extern __m256i _mm256_slli_epi32(__m256i s1, int count);

extern __m256i _mm256_slli_epi64(__m256i s1, int count);

Arguments

s1

integer source vector used for the operation

count

8-bit immediate used for the operation

Description

Performs a logical shift of bits in the individual data elements (words, doublewords, or quadword) in source vector s1 to the left by the number of bits specified in count. The empty low-order bytes are cleared (set to all '0'). If the value specified by count is greater than 15/31/63 (depending on the intrinsic being used), the destination vector is set to all 0s. The count argument is an 8-bit immediate.

Returns

Result of the left-shift operation.