1 files changed, 28 insertions, 0 deletions
diff --git a/vendor/compiler_builtins/libm/src/math/round.rs b/vendor/compiler_builtins/libm/src/math/round.rs
new file mode 100644
index 000000000..46fabc90f
--- /dev/null
+++ b/vendor/compiler_builtins/libm/src/math/round.rs
@@ -0,0 +1,28 @@
+use super::copysign;
+use super::trunc;
+use core::f64;
+
+#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
+pub fn round(x: f64) -> f64 {
+    trunc(x + copysign(0.5 - 0.25 * f64::EPSILON, x))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::round;
+
+    #[test]
+    fn negative_zero() {
+        assert_eq!(round(-0.0_f64).to_bits(), (-0.0_f64).to_bits());
+    }
+
+    #[test]
+    fn sanity_check() {
+        assert_eq!(round(-1.0), -1.0);
+        assert_eq!(round(2.8), 3.0);
+        assert_eq!(round(-0.5), -1.0);
+        assert_eq!(round(0.5), 1.0);
+        assert_eq!(round(-1.5), -2.0);
+        assert_eq!(round(1.5), 2.0);
+    }
+}