Function _mm_cvtph_pd 

pub fn _mm_cvtph_pd(a: __m128h) -> __m128d

Available on x86 and target feature avx512fp16 and target feature avx512vl only.

Convert packed half-precision (16-bit) floating-point elements in a to packed double-precision (64-bit) floating-point elements, and store the results in dst.

Intel’s documentation