Intel® C++ Compiler Classic Developer Guide and Reference

ID 767249
Date 12/16/2022
Public

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<span class='option'>_mm256_castpd256_pd128</span>

Typecasts 256-bit double-precision floating point values to 128-bit double-precision floating point values. No corresponding Intel® AVX instruction.

Syntax

extern __m128d _mm256_castpd256_pd128(__m256d a);

Arguments

a

256-bit float64 source vector

Description

Performs a typecast operation from 256-bit double-precision floating point values to 128-bit double-precision floating point values.

The lower 128-bits of the source vector are passed unchanged to the result. This intrinsic does not introduce extra moves to the generated code.

Returns

A vector with 128-bit double-precision floating point values.