1 files changed, 81 insertions, 0 deletions
diff --git a/vendor/libm/src/math/fmod.rs b/vendor/libm/src/math/fmod.rs
new file mode 100644
index 000000000..2cdd8a9ba
--- /dev/null
+++ b/vendor/libm/src/math/fmod.rs
@@ -0,0 +1,81 @@
+use core::u64;
+
+#[inline]
+#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
+pub fn fmod(x: f64, y: f64) -> f64 {
+    let mut uxi = x.to_bits();
+    let mut uyi = y.to_bits();
+    let mut ex = (uxi >> 52 & 0x7ff) as i64;
+    let mut ey = (uyi >> 52 & 0x7ff) as i64;
+    let sx = uxi >> 63;
+    let mut i;
+
+    if uyi << 1 == 0 || y.is_nan() || ex == 0x7ff {
+        return (x * y) / (x * y);
+    }
+    if uxi << 1 <= uyi << 1 {
+        if uxi << 1 == uyi << 1 {
+            return 0.0 * x;
+        }
+        return x;
+    }
+
+    /* normalize x and y */
+    if ex == 0 {
+        i = uxi << 12;
+        while i >> 63 == 0 {
+            ex -= 1;
+            i <<= 1;
+        }
+        uxi <<= -ex + 1;
+    } else {
+        uxi &= u64::MAX >> 12;
+        uxi |= 1 << 52;
+    }
+    if ey == 0 {
+        i = uyi << 12;
+        while i >> 63 == 0 {
+            ey -= 1;
+            i <<= 1;
+        }
+        uyi <<= -ey + 1;
+    } else {
+        uyi &= u64::MAX >> 12;
+        uyi |= 1 << 52;
+    }
+
+    /* x mod y */
+    while ex > ey {
+        i = uxi.wrapping_sub(uyi);
+        if i >> 63 == 0 {
+            if i == 0 {
+                return 0.0 * x;
+            }
+            uxi = i;
+        }
+        uxi <<= 1;
+        ex -= 1;
+    }
+    i = uxi.wrapping_sub(uyi);
+    if i >> 63 == 0 {
+        if i == 0 {
+            return 0.0 * x;
+        }
+        uxi = i;
+    }
+    while uxi >> 52 == 0 {
+        uxi <<= 1;
+        ex -= 1;
+    }
+
+    /* scale result */
+    if ex > 0 {
+        uxi -= 1 << 52;
+        uxi |= (ex as u64) << 52;
+    } else {
+        uxi >>= -ex + 1;
+    }
+    uxi |= (sx as u64) << 63;
+
+    f64::from_bits(uxi)
+}