replace some transmutes

library/compiler-builtins/src/float/mod.rs

@@ -1,4 +1,3 @@
-use core::mem;
 use core::ops;
 
 use super::int::Int;
@@ -85,8 +84,6 @@ pub trait Float:
     fn is_subnormal(&self) -> bool;
 }
 
-// FIXME: Some of this can be removed if RFC Issue #1424 is resolved
-//        https://github.com/rust-lang/rfcs/issues/1424
 macro_rules! float_impl {
     ($ty:ident, $ity:ident, $sity:ident, $bits:expr, $significand_bits:expr) => {
         impl Float for $ty {
@@ -104,10 +101,10 @@ macro_rules! float_impl {
             const EXPONENT_MASK: Self::Int = !(Self::SIGN_MASK | Self::SIGNIFICAND_MASK);
 
             fn repr(self) -> Self::Int {
-                unsafe { mem::transmute(self) }
+                self.to_bits()
             }
             fn signed_repr(self) -> Self::SignedInt {
-                unsafe { mem::transmute(self) }
+                self.to_bits() as Self::SignedInt
             }
             fn eq_repr(self, rhs: Self) -> bool {
                 if self.is_nan() && rhs.is_nan() {
@@ -117,7 +114,7 @@ macro_rules! float_impl {
                 }
             }
             fn from_repr(a: Self::Int) -> Self {
-                unsafe { mem::transmute(a) }
+                Self::from_bits(a)
             }
             fn from_parts(sign: bool, exponent: Self::Int, significand: Self::Int) -> Self {
                 Self::from_repr(