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Add round_to_even to floating point types #82273

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Add round_to_even to floating point types #82273

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11e396b
Add roundeven float intrinsics
dsprenkels Feb 18, 2021
69572c2
Add round_to_even() to float types
dsprenkels Feb 18, 2021
ddd8edc
Add tests for {f32,f64}::round_to_even() functions
dsprenkels Feb 18, 2021
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Add tests for {f32,f64}::round_to_even() functions
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@dsprenkels
dsprenkels committed Feb 18, 2021
commit ddd8edc843a6d8bc8b64d6fff20a96c78165d2d4
19 changes: 19 additions & 0 deletions library/std/src/f32/tests.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -201,12 +201,31 @@ fn test_round() {
assert_approx_eq!(1.3f32.round(), 1.0f32);
assert_approx_eq!(1.5f32.round(), 2.0f32);
assert_approx_eq!(1.7f32.round(), 2.0f32);
assert_approx_eq!(2.5f32.round(), 3.0f32);
assert_approx_eq!(0.0f32.round(), 0.0f32);
assert_approx_eq!((-0.0f32).round(), -0.0f32);
assert_approx_eq!((-1.0f32).round(), -1.0f32);
assert_approx_eq!((-1.3f32).round(), -1.0f32);
assert_approx_eq!((-1.5f32).round(), -2.0f32);
assert_approx_eq!((-1.7f32).round(), -2.0f32);
assert_approx_eq!((-2.5f32).round(), -3.0f32);
}

#[test]
#[cfg(not(bootstrap))]
fn test_round_to_even() {
assert_approx_eq!(1.0f32.round_to_even(), 1.0f32);
assert_approx_eq!(1.3f32.round_to_even(), 1.0f32);
assert_approx_eq!(1.5f32.round_to_even(), 2.0f32);
assert_approx_eq!(1.7f32.round_to_even(), 2.0f32);
assert_approx_eq!(2.5f32.round_to_even(), 2.0f32);
assert_approx_eq!(0.0f32.round_to_even(), 0.0f32);
assert_approx_eq!((-0.0f32).round_to_even(), -0.0f32);
assert_approx_eq!((-1.0f32).round_to_even(), -1.0f32);
assert_approx_eq!((-1.3f32).round_to_even(), -1.0f32);
assert_approx_eq!((-1.5f32).round_to_even(), -2.0f32);
assert_approx_eq!((-1.7f32).round_to_even(), -2.0f32);
assert_approx_eq!((-2.5f32).round_to_even(), -2.0f32);
}

#[test]
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19 changes: 19 additions & 0 deletions library/std/src/f64/tests.rs
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Expand Up @@ -203,12 +203,31 @@ fn test_round() {
assert_approx_eq!(1.3f64.round(), 1.0f64);
assert_approx_eq!(1.5f64.round(), 2.0f64);
assert_approx_eq!(1.7f64.round(), 2.0f64);
assert_approx_eq!(2.5f64.round(), 3.0f64);
assert_approx_eq!(0.0f64.round(), 0.0f64);
assert_approx_eq!((-0.0f64).round(), -0.0f64);
assert_approx_eq!((-1.0f64).round(), -1.0f64);
assert_approx_eq!((-1.3f64).round(), -1.0f64);
assert_approx_eq!((-1.5f64).round(), -2.0f64);
assert_approx_eq!((-1.7f64).round(), -2.0f64);
assert_approx_eq!((-2.5f64).round(), -3.0f64);
}

#[test]
#[cfg(not(bootstrap))]
fn test_round_to_even() {
assert_approx_eq!(1.0f64.round_to_even(), 1.0f64);
assert_approx_eq!(1.3f64.round_to_even(), 1.0f64);
assert_approx_eq!(1.5f64.round_to_even(), 2.0f64);
assert_approx_eq!(1.7f64.round_to_even(), 2.0f64);
assert_approx_eq!(2.5f64.round_to_even(), 2.0f64);
assert_approx_eq!(0.0f64.round_to_even(), 0.0f64);
assert_approx_eq!((-0.0f64).round_to_even(), -0.0f64);
assert_approx_eq!((-1.0f64).round_to_even(), -1.0f64);
assert_approx_eq!((-1.3f64).round_to_even(), -1.0f64);
assert_approx_eq!((-1.5f64).round_to_even(), -2.0f64);
assert_approx_eq!((-1.7f64).round_to_even(), -2.0f64);
assert_approx_eq!((-2.5f64).round_to_even(), -2.0f64);
}

#[test]
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1 change: 1 addition & 0 deletions library/std/src/lib.rs
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Expand Up @@ -302,6 +302,7 @@
#![feature(ptr_internals)]
#![feature(raw)]
#![feature(ready_macro)]
#![cfg_attr(not(bootstrap), feature(round_to_even))]
#![feature(rustc_attrs)]
#![feature(rustc_private)]
#![feature(shrink_to)]
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