Float32x4.fromFloat64x2 factory constructor
Float32x4.fromFloat64x2(Sets the x and y lanes to their respective values in v and sets the z and w lanes to 0.0.
Source
external factory Float32x4.fromFloat64x2(Float64x2 v);
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https://api.dartlang.org/stable/1.24.3/dart-typed_data/Float32x4/Float32x4.fromFloat64x2.html