bjoernager/rust
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Make some float methods unstable const fn

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Some float methods are now `const fn` under the `const_float_methods` feature gate.

In order to support `min`, `max`, `abs` and `copysign`, the implementation of some intrinsics had to be moved from Miri to rustc_const_eval.
This commit is contained in:
Eduardo Sánchez Muñoz 2024-10-14 21:02:13 +02:00
parent b73e613e00
commit c09ed3e767
14 changed files with 498 additions and 243 deletions
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9
library/std/src/f64.rs
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@ -194,8 +194,9 @@ impl f64 {
#[rustc_allow_incoherent_impl]
#[must_use = "method returns a new number and does not mutate the original value"]
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_unstable(feature = "const_float_methods", issue = "130843")]
#[inline]
pub fn abs(self) -> f64 {
pub const fn abs(self) -> f64 {
unsafe { intrinsics::fabsf64(self) }
}
@ -218,8 +219,9 @@ impl f64 {
#[rustc_allow_incoherent_impl]
#[must_use = "method returns a new number and does not mutate the original value"]
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_unstable(feature = "const_float_methods", issue = "130843")]
#[inline]
pub fn signum(self) -> f64 {
pub const fn signum(self) -> f64 {
if self.is_nan() { Self::NAN } else { 1.0_f64.copysign(self) }
}
@ -252,8 +254,9 @@ impl f64 {
#[rustc_allow_incoherent_impl]
#[must_use = "method returns a new number and does not mutate the original value"]
#[stable(feature = "copysign", since = "1.35.0")]
#[rustc_const_unstable(feature = "const_float_methods", issue = "130843")]
#[inline]
pub fn copysign(self, sign: f64) -> f64 {
pub const fn copysign(self, sign: f64) -> f64 {
unsafe { intrinsics::copysignf64(self, sign) }
}