use crate::element_wise::ElementWiseKer;
#[allow(non_upper_case_globals)]
#[allow(clippy::excessive_precision)]
fn serf(x: &mut f32) {
const a1: f32 = 0.0705230784;
const a2: f32 = 0.0422820123;
const a3: f32 = 0.0092705272;
const a4: f32 = 0.0001520143;
const a5: f32 = 0.0002765672;
const a6: f32 = 0.0000430638;
let signum = x.signum();
let abs = x.abs();
let y = a6 * abs;
let y = (a5 + y) * abs;
let y = (a4 + y) * abs;
let y = (a3 + y) * abs;
let y = (a2 + y) * abs;
let y = (a1 + y) * abs;
let y = 1.0 - (y + 1.0).powi(16).recip();
*x = y.copysign(signum)
}
#[derive(Clone, Debug)]
pub struct SErf4;
impl ElementWiseKer<f32> for SErf4 {
fn name() -> &'static str {
"generic"
}
fn alignment_items() -> usize {
16
}
fn alignment_bytes() -> usize {
16
}
fn nr() -> usize {
4
}
fn run(x: &mut [f32]) {
debug_assert!(x.len() % Self::nr() == 0);
debug_assert!(x.as_ptr() as usize % Self::alignment_bytes() == 0);
x.iter_mut().for_each(serf)
}
}