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    use core::u64;

    /// Absolute value (magnitude) (f64)
    /// Calculates the absolute value (magnitude) of the argument `x`,
    /// by direct manipulation of the bit representation of `x`.
    #[inline]
    #[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
    pub fn fabs(x: f64) -> f64 {
        // On wasm32 we know that LLVM's intrinsic will compile to an optimized
        // `f64.abs` native instruction, so we can leverage this for both code size
        // and speed.
        llvm_intrinsically_optimized! {
            #[cfg(target_arch = "wasm32")] {
                return unsafe { ::core::intrinsics::fabsf64(x) }
            }
        }
        f64::from_bits(x.to_bits() & (u64::MAX / 2))
    }

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