Embed nan-preserving-float crate.

Cargo.toml

@@ -23,7 +23,6 @@ parity-wasm = { version = "0.31", default-features = false }
 byteorder = { version = "1.0", default-features = false }
 hashmap_core = { version = "0.1.9", optional = true }
 memory_units = "0.3.0"
-nan-preserving-float = "0.1.0"
 libm = { version = "0.1.2", optional = true }
 
 [dev-dependencies]

src/lib.rs

@@ -123,8 +123,6 @@ extern crate byteorder;
 extern crate hashmap_core;
 extern crate memory_units as memory_units_crate;
 
-pub extern crate nan_preserving_float;
-
 #[allow(unused_imports)]
 use alloc::prelude::*;
 use core::fmt;
@@ -392,6 +390,7 @@ mod global;
 mod func;
 mod types;
 mod isa;
+pub mod nan_preserving_float;
 
 #[cfg(test)]
 mod tests;

src/nan_preserving_float.rs

@@ -0,0 +1,212 @@
+#![allow(missing_docs)]
+
+#[cfg(not(feature = "std"))]
+use libm::{F32Ext, F64Ext};
+
+use core::ops::{Add, Div, Mul, Neg, Sub, Rem};
+use core::cmp::{Ordering, PartialEq, PartialOrd};
+
+macro_rules! impl_binop {
+    ($for:ident, $is:ident, $op:ident, $func_name:ident) => {
+        impl<T: Into<$for>> $op<T> for $for {
+            type Output = Self;
+
+            fn $func_name(self, other: T) -> Self {
+                $for(
+                    $op::$func_name(
+                        $is::from_bits(self.0),
+                        $is::from_bits(other.into().0)
+                    ).to_bits()
+                )
+            }
+        }
+    }
+}
+
+macro_rules! float {
+    ($for:ident, $rep:ident, $is:ident) => {
+        float!($for, $rep, $is, 1 << (::core::mem::size_of::<$is>() * 8 - 1));
+    };
+    ($for:ident, $rep:ident, $is:ident, $sign_bit:expr) => {
+        #[derive(Copy, Clone)]
+        pub struct $for($rep);
+
+        impl_binop!($for, $is, Add, add);
+        impl_binop!($for, $is, Sub, sub);
+        impl_binop!($for, $is, Mul, mul);
+        impl_binop!($for, $is, Div, div);
+        impl_binop!($for, $is, Rem, rem);
+
+        impl $for {
+            pub fn from_bits(other: $rep) -> Self {
+                $for(other)
+            }
+
+            pub fn to_bits(self) -> $rep {
+                self.0
+            }
+
+            pub fn from_float(fl: $is) -> Self {
+                fl.into()
+            }
+
+            pub fn to_float(self) -> $is {
+                self.into()
+            }
+
+            pub fn is_nan(self) -> bool {
+                self.to_float().is_nan()
+            }
+
+            pub fn abs(self) -> Self {
+                $for(self.0 & !$sign_bit)
+            }
+
+            pub fn fract(self) -> Self {
+                self.to_float().fract().into()
+            }
+
+            pub fn min(self, other: Self) -> Self {
+                Self::from(self.to_float().min(other.to_float()))
+            }
+
+            pub fn max(self, other: Self) -> Self {
+                Self::from(self.to_float().max(other.to_float()))
+            }
+        }
+
+        impl From<$is> for $for {
+            fn from(other: $is) -> $for {
+                $for(other.to_bits())
+            }
+        }
+
+        impl From<$for> for $is {
+            fn from(other: $for) -> $is {
+                <$is>::from_bits(other.0)
+            }
+        }
+
+        impl Neg for $for {
+            type Output = Self;
+
+            fn neg(self) -> Self {
+                $for(self.0 ^ $sign_bit)
+            }
+        }
+
+        impl<T: Into<$for> + Copy> PartialEq<T> for $for {
+            fn eq(&self, other: &T) -> bool {
+                $is::from(*self) == $is::from((*other).into())
+            }
+        }
+
+        impl<T: Into<$for> + Copy> PartialOrd<T> for $for {
+            fn partial_cmp(&self, other: &T) -> Option<Ordering> {
+                $is::from(*self).partial_cmp(&$is::from((*other).into()))
+            }
+        }
+
+        impl ::core::fmt::Debug for $for {
+            fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
+                $is::from(*self).fmt(f)
+            }
+        }
+    }
+}
+
+float!(F32, u32, f32);
+float!(F64, u64, f64);
+
+impl From<u32> for F32 {
+    fn from(other: u32) -> Self {
+        Self::from_bits(other)
+    }
+}
+
+impl From<F32> for u32 {
+    fn from(other: F32) -> Self {
+        other.to_bits()
+    }
+}
+
+impl From<u64> for F64 {
+    fn from(other: u64) -> Self {
+        Self::from_bits(other)
+    }
+}
+
+impl From<F64> for u64 {
+    fn from(other: F64) -> Self {
+        other.to_bits()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    extern crate rand;
+
+    use self::rand::Rng;
+
+    use super::{F32, F64};
+
+    use core::ops::{Add, Div, Mul, Neg, Sub};
+    use core::fmt::Debug;
+    use core::iter;
+
+    fn test_ops<T, F, I>(iter: I)
+    where
+        T: Add<Output = T>
+            + Div<Output = T>
+            + Mul<Output = T>
+            + Sub<Output = T>
+            + Neg<Output = T>
+            + Copy
+            + Debug
+            + PartialEq,
+        F: Into<T>
+            + Add<Output = F>
+            + Div<Output = F>
+            + Mul<Output = F>
+            + Sub<Output = F>
+            + Neg<Output = F>
+            + Copy
+            + Debug,
+        I: IntoIterator<Item = (F, F)>,
+    {
+        for (a, b) in iter {
+            assert_eq!((a + b).into(), a.into() + b.into());
+            assert_eq!((a - b).into(), a.into() - b.into());
+            assert_eq!((a * b).into(), a.into() * b.into());
+            assert_eq!((a / b).into(), a.into() / b.into());
+            assert_eq!((-a).into(), -a.into());
+            assert_eq!((-b).into(), -b.into());
+        }
+    }
+
+    #[test]
+    fn test_ops_f32() {
+        let mut rng = rand::thread_rng();
+        let iter = iter::repeat(()).map(|_| rng.gen());
+
+        test_ops::<F32, f32, _>(iter.take(1000));
+    }
+
+    #[test]
+    fn test_ops_f64() {
+        let mut rng = rand::thread_rng();
+        let iter = iter::repeat(()).map(|_| rng.gen());
+
+        test_ops::<F64, f64, _>(iter.take(1000));
+    }
+
+    #[test]
+    fn test_neg_nan_f32() {
+        assert_eq!((-F32(0xff80_3210)).0, 0x7f80_3210);
+    }
+
+    #[test]
+    fn test_neg_nan_f64() {
+        assert_eq!((-F64(0xff80_3210_0000_0000)).0, 0x7f80_3210_0000_0000);
+    }
+}