1//! libm in pure Rust
2#![deny(warnings)]
3#![no_std]
4#![cfg_attr(all(feature = "unstable"), feature(core_intrinsics))]
5#![allow(clippy::unreadable_literal)]
6#![allow(clippy::many_single_char_names)]
7#![allow(clippy::needless_return)]
8#![allow(clippy::int_plus_one)]
9#![allow(clippy::deprecated_cfg_attr)]
10#![allow(clippy::mixed_case_hex_literals)]
11#![allow(clippy::float_cmp)]
12#![allow(clippy::eq_op)]
13#![allow(clippy::assign_op_pattern)]
14
15mod libm_helper;
16mod math;
17
18use core::{f32, f64};
19
20pub use self::math::*;
21pub use libm_helper::*;
22
23/// Approximate equality with 1 ULP of tolerance
24#[doc(hidden)]
25#[inline]
26pub fn _eqf(a: f32, b: f32) -> Result<(), u32> {
27 if a.is_nan() && b.is_nan() {
28 Ok(())
29 } else {
30 let err: i32 = (a.to_bits() as i32).wrapping_sub(b.to_bits() as i32).abs();
31
32 if err <= 1 {
33 Ok(())
34 } else {
35 Err(err as u32)
36 }
37 }
38}
39
40#[doc(hidden)]
41#[inline]
42pub fn _eq(a: f64, b: f64) -> Result<(), u64> {
43 if a.is_nan() && b.is_nan() {
44 Ok(())
45 } else {
46 let err: i64 = (a.to_bits() as i64).wrapping_sub(b.to_bits() as i64).abs();
47
48 if err <= 1 {
49 Ok(())
50 } else {
51 Err(err as u64)
52 }
53 }
54}
55
56// PowerPC tests are failing on LLVM 13: https://github.com/rust-lang/rust/issues/88520
57#[cfg(not(target_arch = "powerpc64"))]
58#[cfg(all(test, feature = "musl-reference-tests"))]
59include!(concat!(env!("OUT_DIR"), "/musl-tests.rs"));
60