#[repr(simd)]pub struct __m256d(/* private fields */);Available on x86-64 only.
Expand description
256-bit wide set of four f64 types, x86-specific
This type is the same as the __m256d type defined by Intel,
representing a 256-bit SIMD register which internally is consisted of
four packed f64 instances. Usage of this type typically corresponds
to the avx and up target features for x86/x86_64.
Note that unlike __m256i, the integer version of the 256-bit
registers, this __m256d type has one interpretation. Each instance
of __m256d always corresponds to f64x4, or four f64 types packed
together.
The in-memory representation of this type is the same as the one of an equivalent array (i.e. the in-memory order of elements is the same, and there is no padding); however, the alignment