Function std::intrinsics::copysignf64

pub unsafe extern "rust-intrinsic" fn copysignf64(    x: f64,     y: f64) -> f64

???? This is a nightly-only experimental API. (core_intrinsics)

intrinsics are unlikely to ever be stabilized, instead they should be used through stabilized interfaces in the rest of the standard library

Copies the sign from y to x for f64 values.

The stabilized version of this intrinsic is f64::copysign

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Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/intrinsics/fn.copysignf64.html