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 acosh(n: f64) -> f64;
8    pub safe fn asin(n: f64) -> f64;
9    pub safe fn asinh(n: f64) -> f64;
10    pub safe fn atan(n: f64) -> f64;
11    pub safe fn atan2(a: f64, b: f64) -> f64;
12    pub safe fn cosh(n: f64) -> f64;
13    pub safe fn expm1(n: f64) -> f64;
14    pub safe fn expm1f(n: f32) -> f32;
15    #[cfg_attr(target_env = "msvc", link_name = "_hypot")]
16    pub safe fn hypot(x: f64, y: f64) -> f64;
17    #[cfg_attr(target_env = "msvc", link_name = "_hypotf")]
18    pub safe fn hypotf(x: f32, y: f32) -> f32;
19    pub safe fn log1p(n: f64) -> f64;
20    pub safe fn log1pf(n: f32) -> f32;
21    pub safe fn sinh(n: f64) -> f64;
22    pub safe fn tan(n: f64) -> f64;
23    pub safe fn tanh(n: f64) -> f64;
24    pub safe fn tgamma(n: f64) -> f64;
25    pub safe fn tgammaf(n: f32) -> f32;
26    pub safe fn lgamma_r(n: f64, s: &mut i32) -> f64;
27    #[cfg(not(target_os = "aix"))]
28    pub safe fn lgammaf_r(n: f32, s: &mut i32) -> f32;
29    pub safe fn erf(n: f64) -> f64;
30    pub safe fn erff(n: f32) -> f32;
31    pub safe fn erfc(n: f64) -> f64;
32    pub safe fn erfcf(n: f32) -> f32;
33
34    pub safe fn acosf128(n: f128) -> f128;
35    pub safe fn acoshf128(n: f128) -> f128;
36    pub safe fn asinf128(n: f128) -> f128;
37    pub safe fn asinhf128(n: f128) -> f128;
38    pub safe fn atanf128(n: f128) -> f128;
39    pub safe fn atan2f128(a: f128, b: f128) -> f128;
40    pub safe fn cbrtf128(n: f128) -> f128;
41    pub safe fn coshf128(n: f128) -> f128;
42    pub safe fn expm1f128(n: f128) -> f128;
43    pub safe fn hypotf128(x: f128, y: f128) -> f128;
44    pub safe fn log1pf128(n: f128) -> f128;
45    pub safe fn sinhf128(n: f128) -> f128;
46    pub safe fn tanf128(n: f128) -> f128;
47    pub safe fn tanhf128(n: f128) -> f128;
48    pub safe fn tgammaf128(n: f128) -> f128;
49    pub safe fn lgammaf128_r(n: f128, s: &mut i32) -> f128;
50    pub safe fn erff128(n: f128) -> f128;
51    pub safe fn erfcf128(n: f128) -> f128;
52}
53
54cfg_select! {
55    all(target_os = "windows", target_env = "msvc", target_arch = "x86") => {
56        // On 32-bit x86 MSVC these functions aren't defined, so we just define shims
57        // which promote everything to f64, perform the calculation, and then demote
58        // back to f32. While not precisely correct should be "correct enough" for now.
59        #[inline]
60        pub fn acosf(n: f32) -> f32 {
61            f64::acos(n as f64) as f32
62        }
63
64        #[inline]
65        pub fn acoshf(n: f32) -> f32 {
66            f64::acosh(n as f64) as f32
67        }
68
69        #[inline]
70        pub fn asinhf(n: f32) -> f32 {
71            f64::asinh(n as f64) as f32
72        }
73
74        #[inline]
75        pub fn asinf(n: f32) -> f32 {
76            f64::asin(n as f64) as f32
77        }
78
79        #[inline]
80        pub fn atan2f(n: f32, b: f32) -> f32 {
81            f64::atan2(n as f64, b as f64) as f32
82        }
83
84        #[inline]
85        pub fn atanf(n: f32) -> f32 {
86            f64::atan(n as f64) as f32
87        }
88
89        #[inline]
90        pub fn coshf(n: f32) -> f32 {
91            f64::cosh(n as f64) as f32
92        }
93
94        #[inline]
95        pub fn sinhf(n: f32) -> f32 {
96            f64::sinh(n as f64) as f32
97        }
98
99        #[inline]
100        pub fn tanf(n: f32) -> f32 {
101            f64::tan(n as f64) as f32
102        }
103
104        #[inline]
105        pub fn tanhf(n: f32) -> f32 {
106            f64::tanh(n as f64) as f32
107        }
108    }
109    _ => {
110        unsafe extern "C" {
111            pub safe fn acosf(n: f32) -> f32;
112            pub safe fn acoshf(n: f32) -> f32;
113            pub safe fn asinf(n: f32) -> f32;
114            pub safe fn asinhf(n: f32) -> f32;
115            pub safe fn atan2f(a: f32, b: f32) -> f32;
116            pub safe fn atanf(n: f32) -> f32;
117            pub safe fn coshf(n: f32) -> f32;
118            pub safe fn sinhf(n: f32) -> f32;
119            pub safe fn tanf(n: f32) -> f32;
120            pub safe fn tanhf(n: f32) -> f32;
121        }
122    }
123}
124
125// On AIX, we don't have lgammaf_r only the f64 version, so we can
126// use the f64 version lgamma_r
127#[cfg(target_os = "aix")]
128pub fn lgammaf_r(n: f32, s: &mut i32) -> f32 {
129    lgamma_r(n.into(), s) as f32
130}
std/sys/cmath.rs

std/sys/
cmath.rs
