Simplify float to/from_bytes and enable tests

Author: kaidokert

src/ops/bytes.rs

@@ -171,45 +171,38 @@ macro_rules! float_to_from_bytes_impl {
             }
         }
 
-        #[cfg(all(
-            not(feature = "has_float_to_from_bytes"),
-            feature = "has_int_to_from_bytes"
-        ))]
+        #[cfg(not(feature = "has_float_to_from_bytes"))]
         impl ToFromBytes for $T {
             type Bytes = [u8; $L];
 
             #[inline]
             fn to_be_bytes(&self) -> Self::Bytes {
-                <$I as ToFromBytes>::from_ne_bytes(&self.to_ne_bytes()).to_be_bytes()
+                <$I as ToFromBytes>::to_be_bytes(&self.to_bits())
             }
 
             #[inline]
             fn to_le_bytes(&self) -> Self::Bytes {
-                <$I as ToFromBytes>::from_ne_bytes(&self.to_ne_bytes()).to_le_bytes()
+                <$I as ToFromBytes>::to_le_bytes(&self.to_bits())
             }
 
             #[inline]
             fn to_ne_bytes(&self) -> Self::Bytes {
-                unsafe { transmute(*self) }
+                <$I as ToFromBytes>::to_ne_bytes(&self.to_bits())
             }
 
             #[inline]
             fn from_be_bytes(bytes: &Self::Bytes) -> Self {
-                <Self as ToFromBytes>::from_ne_bytes(
-                    &<$I as ToFromBytes>::from_be_bytes(bytes).to_ne_bytes(),
-                )
+                Self::from_bits(<$I as ToFromBytes>::from_be_bytes(&bytes))
             }
 
             #[inline]
             fn from_le_bytes(bytes: &Self::Bytes) -> Self {
-                <Self as ToFromBytes>::from_ne_bytes(
-                    &<$I as ToFromBytes>::from_le_bytes(bytes).to_ne_bytes(),
-                )
+                Self::from_bits(<$I as ToFromBytes>::from_le_bytes(&bytes))
             }
 
             #[inline]
             fn from_ne_bytes(bytes: &Self::Bytes) -> Self {
-                unsafe { transmute(*bytes) }
+                Self::from_bits(<$I as ToFromBytes>::from_ne_bytes(&bytes))
             }
         }
     };
@@ -356,7 +349,6 @@ mod tests {
         check_to_from_bytes!(i128 u128);
     }
 
-    #[cfg(feature = "has_float_to_from_bytes")]
     #[test]
     fn convert_between_float_and_bytes() {
         macro_rules! check_to_from_bytes {