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
15 mod math;
16
17 use core::{f32, f64};
18
19 pub use self::math::*;
20
21 /// Approximate equality with 1 ULP of tolerance
22 #[doc(hidden)]
23 #[inline]
_eqf(a: f32, b: f32) -> Result<(), u32>24 pub fn _eqf(a: f32, b: f32) -> Result<(), u32> {
25 if a.is_nan() && b.is_nan() {
26 Ok(())
27 } else {
28 let err = (a.to_bits() as i32).wrapping_sub(b.to_bits() as i32).abs();
29
30 if err <= 1 {
31 Ok(())
32 } else {
33 Err(err as u32)
34 }
35 }
36 }
37
38 #[doc(hidden)]
39 #[inline]
_eq(a: f64, b: f64) -> Result<(), u64>40 pub fn _eq(a: f64, b: f64) -> Result<(), u64> {
41 if a.is_nan() && b.is_nan() {
42 Ok(())
43 } else {
44 let err = (a.to_bits() as i64).wrapping_sub(b.to_bits() as i64).abs();
45
46 if err <= 1 {
47 Ok(())
48 } else {
49 Err(err as u64)
50 }
51 }
52 }
53
54 // PowerPC tests are failing on LLVM 13: https://github.com/rust-lang/rust/issues/88520
55 #[cfg(not(target_arch = "powerpc64"))]
56 #[cfg(all(test, feature = "musl-reference-tests"))]
57 include!(concat!(env!("OUT_DIR"), "/musl-tests.rs"));
58