pub const fn copysignf64(x: f64, y: f64) -> f64
core_intrinsics)
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