# _mm_sllv_epi32/64

Logical shift of word/doubleword elements in a 128-bit vector to left according variable values. The corresponding Intel® AVX2 instruction is VPSLLVD or `VPSLLVQ`.

## Syntax

extern __m128i _mm_sllv_epi32(__m128i s1, __m128i s2);

extern __m128i _mm_sllv_epi64(__m128i s1, __m128i s2);

## Arguments

s1 | 128-bit integer source vector used for the operation
s2 | 128-bit integer source vector providing variable values for shift operation

## Description

Performs a logical shift of 32 or 64 bits (doublewords, or quadword) in the individual data elements in source vector s1 to the left by the count value of corresponding data elements in source vector s2. As the bits in the data elements are shifted left, the empty low-order bits are cleared (set to '0').

The count values are specified individually in each data element of the second source vector. If the unsigned integer value specified in the respective data element of the second source vector is greater than 31 (for a doubleword), or 63 (for a quadword), then the destination data elements are set to '0'.

## Returns

Result of the left-shift operation.

Parent topic: Intrinsics for Logical Shift Operations