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document rounding behavior of rint/nearbyint for ties

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This commit is contained in:
Ralf Jung 2024-01-06 12:57:03 +01:00
parent 5cb2e7dfc3
commit 96acaff359
1 changed files with 12 additions and 6 deletions
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18
library/core/src/intrinsics.rs
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@ -1783,27 +1783,33 @@ extern "rust-intrinsic" {
#[rustc_nounwind] #[rustc_nounwind]
pub fn truncf64(x: f64) -> f64; pub fn truncf64(x: f64) -> f64;
/// Returns the nearest integer to an `f32`. May raise an inexact floating-point exception /// Returns the nearest integer to an `f32`. Changing the rounding mode is not possible in Rust,
/// if the argument is not an integer. /// so this rounds half-way cases to the number with an even least significant digit.
///
/// May raise an inexact floating-point exception if the argument is not an integer.
/// ///
/// The stabilized version of this intrinsic is /// The stabilized version of this intrinsic is
/// [`f32::round_ties_even`](../../std/primitive.f32.html#method.round_ties_even) /// [`f32::round_ties_even`](../../std/primitive.f32.html#method.round_ties_even)
#[rustc_nounwind] #[rustc_nounwind]
pub fn rintf32(x: f32) -> f32; pub fn rintf32(x: f32) -> f32;
/// Returns the nearest integer to an `f64`. May raise an inexact floating-point exception /// Returns the nearest integer to an `f64`. Changing the rounding mode is not possible in Rust,
/// if the argument is not an integer. /// so this rounds half-way cases to the number with an even least significant digit.
///
/// May raise an inexact floating-point exception if the argument is not an integer.
/// ///
/// The stabilized version of this intrinsic is /// The stabilized version of this intrinsic is
/// [`f64::round_ties_even`](../../std/primitive.f64.html#method.round_ties_even) /// [`f64::round_ties_even`](../../std/primitive.f64.html#method.round_ties_even)
#[rustc_nounwind] #[rustc_nounwind]
pub fn rintf64(x: f64) -> f64; pub fn rintf64(x: f64) -> f64;
/// Returns the nearest integer to an `f32`. /// Returns the nearest integer to an `f32`. Changing the rounding mode is not possible in Rust,
/// so this rounds half-way cases to the number with an even least significant digit.
/// ///
/// This intrinsic does not have a stable counterpart. /// This intrinsic does not have a stable counterpart.
#[rustc_nounwind] #[rustc_nounwind]
pub fn nearbyintf32(x: f32) -> f32; pub fn nearbyintf32(x: f32) -> f32;
/// Returns the nearest integer to an `f64`. /// Returns the nearest integer to an `f64`. Changing the rounding mode is not possible in Rust,
/// so this rounds half-way cases to the number with an even least significant digit.
/// ///
/// This intrinsic does not have a stable counterpart. /// This intrinsic does not have a stable counterpart.
#[rustc_nounwind] #[rustc_nounwind]