1 files changed, 92 insertions, 0 deletions
diff --git a/library/std/src/sys/windows/cmath.rs b/library/std/src/sys/windows/cmath.rs
new file mode 100644
index 000000000..1a5421fac
--- /dev/null
+++ b/library/std/src/sys/windows/cmath.rs
@@ -0,0 +1,92 @@
+#![cfg(not(test))]
+
+use libc::{c_double, c_float};
+
+extern "C" {
+    pub fn acos(n: c_double) -> c_double;
+    pub fn asin(n: c_double) -> c_double;
+    pub fn atan(n: c_double) -> c_double;
+    pub fn atan2(a: c_double, b: c_double) -> c_double;
+    pub fn cbrt(n: c_double) -> c_double;
+    pub fn cbrtf(n: c_float) -> c_float;
+    pub fn cosh(n: c_double) -> c_double;
+    pub fn expm1(n: c_double) -> c_double;
+    pub fn expm1f(n: c_float) -> c_float;
+    pub fn fdim(a: c_double, b: c_double) -> c_double;
+    pub fn fdimf(a: c_float, b: c_float) -> c_float;
+    #[cfg_attr(target_env = "msvc", link_name = "_hypot")]
+    pub fn hypot(x: c_double, y: c_double) -> c_double;
+    #[cfg_attr(target_env = "msvc", link_name = "_hypotf")]
+    pub fn hypotf(x: c_float, y: c_float) -> c_float;
+    pub fn log1p(n: c_double) -> c_double;
+    pub fn log1pf(n: c_float) -> c_float;
+    pub fn sinh(n: c_double) -> c_double;
+    pub fn tan(n: c_double) -> c_double;
+    pub fn tanh(n: c_double) -> c_double;
+}
+
+pub use self::shims::*;
+
+#[cfg(not(all(target_env = "msvc", target_arch = "x86")))]
+mod shims {
+    use libc::c_float;
+
+    extern "C" {
+        pub fn acosf(n: c_float) -> c_float;
+        pub fn asinf(n: c_float) -> c_float;
+        pub fn atan2f(a: c_float, b: c_float) -> c_float;
+        pub fn atanf(n: c_float) -> c_float;
+        pub fn coshf(n: c_float) -> c_float;
+        pub fn sinhf(n: c_float) -> c_float;
+        pub fn tanf(n: c_float) -> c_float;
+        pub fn tanhf(n: c_float) -> c_float;
+    }
+}
+
+// On 32-bit x86 MSVC these functions aren't defined, so we just define shims
+// which promote everything fo f64, perform the calculation, and then demote
+// back to f32. While not precisely correct should be "correct enough" for now.
+#[cfg(all(target_env = "msvc", target_arch = "x86"))]
+mod shims {
+    use libc::c_float;
+
+    #[inline]
+    pub unsafe fn acosf(n: c_float) -> c_float {
+        f64::acos(n as f64) as c_float
+    }
+
+    #[inline]
+    pub unsafe fn asinf(n: c_float) -> c_float {
+        f64::asin(n as f64) as c_float
+    }
+
+    #[inline]
+    pub unsafe fn atan2f(n: c_float, b: c_float) -> c_float {
+        f64::atan2(n as f64, b as f64) as c_float
+    }
+
+    #[inline]
+    pub unsafe fn atanf(n: c_float) -> c_float {
+        f64::atan(n as f64) as c_float
+    }
+
+    #[inline]
+    pub unsafe fn coshf(n: c_float) -> c_float {
+        f64::cosh(n as f64) as c_float
+    }
+
+    #[inline]
+    pub unsafe fn sinhf(n: c_float) -> c_float {
+        f64::sinh(n as f64) as c_float
+    }
+
+    #[inline]
+    pub unsafe fn tanf(n: c_float) -> c_float {
+        f64::tan(n as f64) as c_float
+    }
+
+    #[inline]
+    pub unsafe fn tanhf(n: c_float) -> c_float {
+        f64::tanh(n as f64) as c_float
+    }
+}