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_mm256_castpd256_pd128

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.

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