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/f128.rs
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@ -210,8 +210,9 @@ impl f128 {
#[inline]
#[rustc_allow_incoherent_impl]
#[unstable(feature = "f128", issue = "116909")]
#[rustc_const_unstable(feature = "const_float_methods", issue = "130843")]
#[must_use = "method returns a new number and does not mutate the original value"]
pub fn abs(self) -> Self {
pub const fn abs(self) -> Self {
// FIXME(f16_f128): replace with `intrinsics::fabsf128` when available
// We don't do this now because LLVM has lowering bugs for f128 math.
Self::from_bits(self.to_bits() & !(1 << 127))
@ -240,8 +241,9 @@ impl f128 {
#[inline]
#[rustc_allow_incoherent_impl]
#[unstable(feature = "f128", issue = "116909")]
#[rustc_const_unstable(feature = "const_float_methods", issue = "130843")]
#[must_use = "method returns a new number and does not mutate the original value"]
pub fn signum(self) -> f128 {
pub const fn signum(self) -> f128 {
if self.is_nan() { Self::NAN } else { 1.0_f128.copysign(self) }
}
@ -278,8 +280,9 @@ impl f128 {
#[inline]
#[rustc_allow_incoherent_impl]
#[unstable(feature = "f128", issue = "116909")]
#[rustc_const_unstable(feature = "const_float_methods", issue = "130843")]
#[must_use = "method returns a new number and does not mutate the original value"]
pub fn copysign(self, sign: f128) -> f128 {
pub const fn copysign(self, sign: f128) -> f128 {
unsafe { intrinsics::copysignf128(self, sign) }
}