pub unsafe fn _mm512_castpd128_pd512(a: __m128d) -> __m512d
🔬This is a nightly-only experimental API. (stdsimd)
Available on x86-64 only.
Expand description

Cast vector of type __m128d to type __m512d; the upper 384 bits of the result are undefined. This intrinsic is only used for compilation and does not generate any instructions, thus it has zero latency.

Intel’s documentation