std/sys/
cmath.rs

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

std/sys/
cmath.rs
