Function core::arch::x86::_mm256_cvtsd_f64

pub unsafe fn _mm256_cvtsd_f64(a: __m256d) -> f64

This is supported on (non-crate feature miri-test-libstd or test or doctest) and x86 and target feature avx2 only.

Returns the first element of the input vector of [4 x double].

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