std/sys/
cmath.rs

1#![cfg(not(test))]
2
3// These symbols are all defined by `libm`,
4// or by `compiler-builtins` on unsupported platforms.
5unsafe extern "C" {
6    pub safe fn acos(n: f64) -> f64;
7    pub safe fn asin(n: f64) -> f64;
8    pub safe fn atan(n: f64) -> f64;
9    pub safe fn atan2(a: f64, b: f64) -> f64;
10    pub safe fn cosh(n: f64) -> f64;
11    pub safe fn expm1(n: f64) -> f64;
12    pub safe fn expm1f(n: f32) -> f32;
13    #[cfg_attr(target_env = "msvc", link_name = "_hypot")]
14    pub safe fn hypot(x: f64, y: f64) -> f64;
15    #[cfg_attr(target_env = "msvc", link_name = "_hypotf")]
16    pub safe fn hypotf(x: f32, y: f32) -> f32;
17    pub safe fn log1p(n: f64) -> f64;
18    pub safe fn log1pf(n: f32) -> f32;
19    pub safe fn sinh(n: f64) -> f64;
20    pub safe fn tan(n: f64) -> f64;
21    pub safe fn tanh(n: f64) -> f64;
22    pub safe fn tgamma(n: f64) -> f64;
23    pub safe fn tgammaf(n: f32) -> f32;
24    pub safe fn lgamma_r(n: f64, s: &mut i32) -> f64;
25    #[cfg(not(target_os = "aix"))]
26    pub safe fn lgammaf_r(n: f32, s: &mut i32) -> f32;
27    pub safe fn erf(n: f64) -> f64;
28    pub safe fn erff(n: f32) -> f32;
29    pub safe fn erfc(n: f64) -> f64;
30    pub safe fn erfcf(n: f32) -> f32;
31
32    pub safe fn acosf128(n: f128) -> f128;
33    pub safe fn asinf128(n: f128) -> f128;
34    pub safe fn atanf128(n: f128) -> f128;
35    pub safe fn atan2f128(a: f128, b: f128) -> f128;
36    pub safe fn cbrtf128(n: f128) -> f128;
37    pub safe fn coshf128(n: f128) -> f128;
38    pub safe fn expm1f128(n: f128) -> f128;
39    pub safe fn hypotf128(x: f128, y: f128) -> f128;
40    pub safe fn log1pf128(n: f128) -> f128;
41    pub safe fn sinhf128(n: f128) -> f128;
42    pub safe fn tanf128(n: f128) -> f128;
43    pub safe fn tanhf128(n: f128) -> f128;
44    pub safe fn tgammaf128(n: f128) -> f128;
45    pub safe fn lgammaf128_r(n: f128, s: &mut i32) -> f128;
46    pub safe fn erff128(n: f128) -> f128;
47    pub safe fn erfcf128(n: f128) -> f128;
48
49    cfg_if::cfg_if! {
50    if #[cfg(not(all(target_os = "windows", target_env = "msvc", target_arch = "x86")))] {
51        pub safe fn acosf(n: f32) -> f32;
52        pub safe fn asinf(n: f32) -> f32;
53        pub safe fn atan2f(a: f32, b: f32) -> f32;
54        pub safe fn atanf(n: f32) -> f32;
55        pub safe fn coshf(n: f32) -> f32;
56        pub safe fn sinhf(n: f32) -> f32;
57        pub safe fn tanf(n: f32) -> f32;
58        pub safe fn tanhf(n: f32) -> f32;
59    }}
60}
61
62// On AIX, we don't have lgammaf_r only the f64 version, so we can
63// use the f64 version lgamma_r
64#[cfg(target_os = "aix")]
65pub fn lgammaf_r(n: f32, s: &mut i32) -> f32 {
66    lgamma_r(n.into(), s) as f32
67}
68
69// On 32-bit x86 MSVC these functions aren't defined, so we just define shims
70// which promote everything to f64, perform the calculation, and then demote
71// back to f32. While not precisely correct should be "correct enough" for now.
72cfg_if::cfg_if! {
73if #[cfg(all(target_os = "windows", target_env = "msvc", target_arch = "x86"))] {
74    #[inline]
75    pub fn acosf(n: f32) -> f32 {
76        f64::acos(n as f64) as f32
77    }
78
79    #[inline]
80    pub fn asinf(n: f32) -> f32 {
81        f64::asin(n as f64) as f32
82    }
83
84    #[inline]
85    pub fn atan2f(n: f32, b: f32) -> f32 {
86        f64::atan2(n as f64, b as f64) as f32
87    }
88
89    #[inline]
90    pub fn atanf(n: f32) -> f32 {
91        f64::atan(n as f64) as f32
92    }
93
94    #[inline]
95    pub fn coshf(n: f32) -> f32 {
96        f64::cosh(n as f64) as f32
97    }
98
99    #[inline]
100    pub fn sinhf(n: f32) -> f32 {
101        f64::sinh(n as f64) as f32
102    }
103
104    #[inline]
105    pub fn tanf(n: f32) -> f32 {
106        f64::tan(n as f64) as f32
107    }
108
109    #[inline]
110    pub fn tanhf(n: f32) -> f32 {
111        f64::tanh(n as f64) as f32
112    }
113}}
std/sys/cmath.rs

std/sys/
cmath.rs
