fune/third_party/rust/libm/src/lib.rs

//! libm in pure Rust
#![deny(warnings)]
#![no_std]
#![cfg_attr(all(feature = "unstable"), feature(core_intrinsics))]
#![allow(clippy::unreadable_literal)]
#![allow(clippy::many_single_char_names)]
#![allow(clippy::needless_return)]
#![allow(clippy::int_plus_one)]
#![allow(clippy::deprecated_cfg_attr)]
#![allow(clippy::mixed_case_hex_literals)]
#![allow(clippy::float_cmp)]
#![allow(clippy::eq_op)]
#![allow(clippy::assign_op_pattern)]

mod math;

use core::{f32, f64};

pub use self::math::*;

/// Approximate equality with 1 ULP of tolerance
#[doc(hidden)]
#[inline]
pub fn _eqf(a: f32, b: f32) -> Result<(), u32> {
    if a.is_nan() && b.is_nan() {
        Ok(())
    } else {
        let err = (a.to_bits() as i32).wrapping_sub(b.to_bits() as i32).abs();

        if err <= 1 {
            Ok(())
        } else {
            Err(err as u32)
        }
    }
}

#[doc(hidden)]
#[inline]
pub fn _eq(a: f64, b: f64) -> Result<(), u64> {
    if a.is_nan() && b.is_nan() {
        Ok(())
    } else {
        let err = (a.to_bits() as i64).wrapping_sub(b.to_bits() as i64).abs();

        if err <= 1 {
            Ok(())
        } else {
            Err(err as u64)
        }
    }
}

// PowerPC tests are failing on LLVM 13: https://github.com/rust-lang/rust/issues/88520
#[cfg(not(target_arch = "powerpc64"))]
#[cfg(all(test, feature = "musl-reference-tests"))]
include!(concat!(env!("OUT_DIR"), "/musl-tests.rs"));