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use super::{copysign, trunc};
use crate::support::{Float, MinInt};
#[inline]
pub fn round<F: Float>(x: F) -> F {
let f0p5 = F::from_parts(false, F::EXP_BIAS - 1, F::Int::ZERO); // 0.5
let f0p25 = F::from_parts(false, F::EXP_BIAS - 2, F::Int::ZERO); // 0.25
trunc(x + copysign(f0p5 - f0p25 * F::EPSILON, x))
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
#[cfg(f16_enabled)]
fn zeroes_f16() {
assert_biteq!(round(0.0_f16), 0.0_f16);
assert_biteq!(round(-0.0_f16), -0.0_f16);
}
#[test]
#[cfg(f16_enabled)]
fn sanity_check_f16() {
assert_eq!(round(-1.0_f16), -1.0);
assert_eq!(round(2.8_f16), 3.0);
assert_eq!(round(-0.5_f16), -1.0);
assert_eq!(round(0.5_f16), 1.0);
assert_eq!(round(-1.5_f16), -2.0);
assert_eq!(round(1.5_f16), 2.0);
}
#[test]
fn zeroes_f32() {
assert_biteq!(round(0.0_f32), 0.0_f32);
assert_biteq!(round(-0.0_f32), -0.0_f32);
}
#[test]
fn sanity_check_f32() {
assert_eq!(round(-1.0_f32), -1.0);
assert_eq!(round(2.8_f32), 3.0);
assert_eq!(round(-0.5_f32), -1.0);
assert_eq!(round(0.5_f32), 1.0);
assert_eq!(round(-1.5_f32), -2.0);
assert_eq!(round(1.5_f32), 2.0);
}
#[test]
fn zeroes_f64() {
assert_biteq!(round(0.0_f64), 0.0_f64);
assert_biteq!(round(-0.0_f64), -0.0_f64);
}
#[test]
fn sanity_check_f64() {
assert_eq!(round(-1.0_f64), -1.0);
assert_eq!(round(2.8_f64), 3.0);
assert_eq!(round(-0.5_f64), -1.0);
assert_eq!(round(0.5_f64), 1.0);
assert_eq!(round(-1.5_f64), -2.0);
assert_eq!(round(1.5_f64), 2.0);
}
#[test]
#[cfg(f128_enabled)]
fn zeroes_f128() {
assert_biteq!(round(0.0_f128), 0.0_f128);
assert_biteq!(round(-0.0_f128), -0.0_f128);
}
#[test]
#[cfg(f128_enabled)]
fn sanity_check_f128() {
assert_eq!(round(-1.0_f128), -1.0);
assert_eq!(round(2.8_f128), 3.0);
assert_eq!(round(-0.5_f128), -1.0);
assert_eq!(round(0.5_f128), 1.0);
assert_eq!(round(-1.5_f128), -2.0);
assert_eq!(round(1.5_f128), 2.0);
}
}
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