Конструктор фабрики Float64x2.fromFloat32x4
Float64x2.fromFloat32x4(Использует "x" и "y" полосы из v.
Исходный код
external factory Float64x2.fromFloat32x4(Float32x4 v);
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https://api.dartlang.org/stable/1.24.3/dart-typed_data/Float64x2/Float64x2.fromFloat32x4.html
