1 files changed, 59 insertions, 0 deletions
diff --git a/vendor/libm-0.1.4/src/math/sincos.rs b/vendor/libm-0.1.4/src/math/sincos.rs
new file mode 100644
index 000000000..750908df4
--- /dev/null
+++ b/vendor/libm-0.1.4/src/math/sincos.rs
@@ -0,0 +1,59 @@
+/* origin: FreeBSD /usr/src/lib/msun/src/s_sin.c */
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+
+use super::{get_high_word, k_cos, k_sin, rem_pio2};
+
+pub fn sincos(x: f64) -> (f64, f64) {
+    let s: f64;
+    let c: f64;
+    let mut ix: u32;
+
+    ix = get_high_word(x);
+    ix &= 0x7fffffff;
+
+    /* |x| ~< pi/4 */
+    if ix <= 0x3fe921fb {
+        /* if |x| < 2**-27 * sqrt(2) */
+        if ix < 0x3e46a09e {
+            /* raise inexact if x!=0 and underflow if subnormal */
+            let x1p120 = f64::from_bits(0x4770000000000000); // 0x1p120 == 2^120
+            if ix < 0x00100000 {
+                force_eval!(x / x1p120);
+            } else {
+                force_eval!(x + x1p120);
+            }
+            return (x, 1.0);
+        }
+        return (k_sin(x, 0.0, 0), k_cos(x, 0.0));
+    }
+
+    /* sincos(Inf or NaN) is NaN */
+    if ix >= 0x7ff00000 {
+        let rv = x - x;
+        return (rv, rv);
+    }
+
+    /* argument reduction needed */
+    let (n, y0, y1) = rem_pio2(x);
+    s = k_sin(y0, y1, 1);
+    c = k_cos(y0, y1);
+    match n & 3 {
+        0 => (s, c),
+        1 => (c, -s),
+        2 => (-s, -c),
+        3 => (-c, s),
+        #[cfg(feature = "checked")]
+        _ => unreachable!(),
+        #[cfg(not(feature = "checked"))]
+        _ => (0.0, 1.0),
+    }
+}