Intel® C++ Compiler 16.0 User and Reference Guide
Typecasts 256-bit double-precision floating point values to 128-bit double-precision floating point values. No corresponding Intel® AVX instruction.
extern __m128d _mm256_castpd256_pd128(__m256d a); |
a |
256-bit float64 source vector |
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.
A vector with 128-bit double-precision floating point values.