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.

Para obtener información más completa sobre las optimizaciones del compilador, consulte nuestro Aviso de optimización.