Intel® C++ Compiler Classic Developer Guide and Reference

ID 767249
Date 3/31/2023
Public

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_mm256_sign_epi8/16/32

Changes the sign of elements in one source vector depending on the sign of corresponding element in other source vector. The corresponding Intel® AVX2 instruction is VPSIGNB, VPSIGNW, or VPSIGND.

Syntax

extern __m256i _mm256_sign_epi8(__m256i s1, __m256i s2);

extern __m256i _mm256_sign_epi16(__m256i s1, __m256i s2);

extern __m256i _mm256_sign_epi32(__m256i s1, __m256i s2);

Arguments

s1

integer source vector used for the operation

s2

integer source vector used for the operation

Description

Modifies the sign of data elements in the source vector s1 depending on the sign of corresponding element in vector s2 as follows:

  • If sign of data element in s2 vector is < 0 then the sign of corresponding data element in vector s1 is made negative.

  • If sign of data element in s2 vector is > 0 then the sign of corresponding data element in vector s1 is left unchanged.

  • If the data element in s2 vector is = 0 then the corresponding data element in vector s1 is set to 0.

The _mm256_sign_epi8 intrinsic operates on 8-bit signed bytes. The _mm256_sign_epi16 intrinsic operates on 16-bit signed words. The _mm256_sign_epi32 intrinsic operates on 32-bit signed integers.

Returns

Result of the operation.