Function f64x2_promote_low_f32x4

pub fn f64x2_promote_low_f32x4(a: v128) -> v128

🔬This is a nightly-only experimental API. (simd_wasm64 #90599)

Available on target_family="wasm" and target feature simd128 only.

Conversion of the two lower single-precision floating point lanes to the two double-precision lanes of the result.