1 files changed, 37 insertions, 0 deletions
diff --git a/vendor/libm/src/math/round.rs b/vendor/libm/src/math/round.rs
new file mode 100644
index 000000000..9a9723cfb
--- /dev/null
+++ b/vendor/libm/src/math/round.rs
@@ -0,0 +1,37 @@
+use core::f64;
+
+const TOINT: f64 = 1.0 / f64::EPSILON;
+
+#[inline]
+#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
+pub fn round(mut x: f64) -> f64 {
+    let (f, i) = (x, x.to_bits());
+    let e: u64 = i >> 52 & 0x7ff;
+    let mut y: f64;
+
+    if e >= 0x3ff + 52 {
+        return x;
+    }
+    if i >> 63 != 0 {
+        x = -x;
+    }
+    if e < 0x3ff - 1 {
+        // raise inexact if x!=0
+        force_eval!(x + TOINT);
+        return 0.0 * f;
+    }
+    y = x + TOINT - TOINT - x;
+    if y > 0.5 {
+        y = y + x - 1.0;
+    } else if y <= -0.5 {
+        y = y + x + 1.0;
+    } else {
+        y = y + x;
+    }
+
+    if i >> 63 != 0 {
+        -y
+    } else {
+        y
+    }
+}