diff --git a/src/librustc_mir/interpret/eval_context.rs b/src/librustc_mir/interpret/eval_context.rs
index 19dc2bdf847d..2d86c14a86ae 100644
--- a/src/librustc_mir/interpret/eval_context.rs
+++ b/src/librustc_mir/interpret/eval_context.rs
@@ -1610,7 +1610,7 @@ impl<'a, 'tcx, M: Machine<'tcx>> EvalContext<'a, 'tcx, M> {
             }
             Value::ByVal(primval) => {
                 let size = self.type_size(dest_ty)?.expect("dest type must be sized");
-                // TODO: This fn gets called with sizes like 6, which cannot be a primitive type
+                // TODO: This fn gets called with sizes like 0 and 6, which cannot be a primitive type
                 // and hence is not supported by write_primval.
                 // (E.g. in the arrays.rs testcase.)  That seems to only happen for Undef though,
                 // so we special-case that here.
@@ -1808,7 +1808,15 @@ impl<'a, 'tcx, M: Machine<'tcx>> EvalContext<'a, 'tcx, M> {
 
         let ptr = ptr.to_ptr()?;
         let val = match ty.sty {
-            ty::TyBool => PrimVal::from_bool(self.memory.read_bool(ptr)?),
+            ty::TyBool => {
+                let val = self.memory.read_primval(ptr, 1, false)?;
+                let val = match val {
+                    PrimVal::Bytes(0) => false,
+                    PrimVal::Bytes(1) => true,
+                    _ => return err!(InvalidBool),
+                };
+                PrimVal::from_bool(val)
+            }
             ty::TyChar => {
                 let c = self.memory.read_primval(ptr, 4, false)?.to_bytes()? as u32;
                 match ::std::char::from_u32(c) {
@@ -1843,8 +1851,8 @@ impl<'a, 'tcx, M: Machine<'tcx>> EvalContext<'a, 'tcx, M> {
                 self.memory.read_primval(ptr, size, false)?
             }
 
-            ty::TyFloat(FloatTy::F32) => PrimVal::from_f32(self.memory.read_f32(ptr)?),
-            ty::TyFloat(FloatTy::F64) => PrimVal::from_f64(self.memory.read_f64(ptr)?),
+            ty::TyFloat(FloatTy::F32) => PrimVal::Bytes(self.memory.read_primval(ptr, 4, false)?.to_bytes()?),
+            ty::TyFloat(FloatTy::F64) => PrimVal::Bytes(self.memory.read_primval(ptr, 8, false)?.to_bytes()?),
 
             ty::TyFnPtr(_) => self.memory.read_ptr_sized_unsigned(ptr)?,
             ty::TyRef(_, ref tam) |
diff --git a/src/librustc_mir/interpret/memory.rs b/src/librustc_mir/interpret/memory.rs
index d8a4ae66cf67..8e2b5e9c4309 100644
--- a/src/librustc_mir/interpret/memory.rs
+++ b/src/librustc_mir/interpret/memory.rs
@@ -1207,7 +1207,6 @@ impl<'a, 'tcx, M: Machine<'tcx>> Memory<'a, 'tcx, M> {
     }
 
     pub fn write_primval(&mut self, ptr: MemoryPointer, val: PrimVal, size: u64, signed: bool) -> EvalResult<'tcx> {
-        trace!("Writing {:?}, size {}", val, size);
         let align = self.int_align(size)?;
         let endianess = self.endianess();
 
@@ -1265,22 +1264,6 @@ impl<'a, 'tcx, M: Machine<'tcx>> Memory<'a, 'tcx, M> {
         self.write_primval(ptr, val, ptr_size, false)
     }
 
-    pub fn read_bool(&self, ptr: MemoryPointer) -> EvalResult<'tcx, bool> {
-        let bytes = self.get_bytes(ptr, 1, self.layout.i1_align.abi())?;
-        match bytes[0] {
-            0 => Ok(false),
-            1 => Ok(true),
-            _ => err!(InvalidBool),
-        }
-    }
-
-    pub fn write_bool(&mut self, ptr: MemoryPointer, b: bool) -> EvalResult<'tcx> {
-        let align = self.layout.i1_align.abi();
-        self.get_bytes_mut(ptr, 1, align).map(
-            |bytes| bytes[0] = b as u8,
-        )
-    }
-
     fn int_align(&self, size: u64) -> EvalResult<'tcx, u64> {
         // We assume pointer-sized integers have the same alignment as pointers.
         // We also assume singed and unsigned integers of the same size have the same alignment.
@@ -1293,38 +1276,6 @@ impl<'a, 'tcx, M: Machine<'tcx>> Memory<'a, 'tcx, M> {
             _ => bug!("bad integer size: {}", size),
         }
     }
-
-    pub fn write_f32(&mut self, ptr: MemoryPointer, f: f32) -> EvalResult<'tcx> {
-        let endianess = self.endianess();
-        let align = self.layout.f32_align.abi();
-        let b = self.get_bytes_mut(ptr, 4, align)?;
-        write_target_f32(endianess, b, f).unwrap();
-        Ok(())
-    }
-
-    pub fn write_f64(&mut self, ptr: MemoryPointer, f: f64) -> EvalResult<'tcx> {
-        let endianess = self.endianess();
-        let align = self.layout.f64_align.abi();
-        let b = self.get_bytes_mut(ptr, 8, align)?;
-        write_target_f64(endianess, b, f).unwrap();
-        Ok(())
-    }
-
-    pub fn read_f32(&self, ptr: MemoryPointer) -> EvalResult<'tcx, f32> {
-        self.get_bytes(ptr, 4, self.layout.f32_align.abi()).map(
-            |b| {
-                read_target_f32(self.endianess(), b).unwrap()
-            },
-        )
-    }
-
-    pub fn read_f64(&self, ptr: MemoryPointer) -> EvalResult<'tcx, f64> {
-        self.get_bytes(ptr, 8, self.layout.f64_align.abi()).map(
-            |b| {
-                read_target_f64(self.endianess(), b).unwrap()
-            },
-        )
-    }
 }
 
 /// Relocations
@@ -1496,45 +1447,6 @@ fn read_target_int(endianess: layout::Endian, mut source: &[u8]) -> Result<i128,
     }
 }
 
-
-////////////////////////////////////////////////////////////////////////////////
-// Methods to access floats in the target endianess
-////////////////////////////////////////////////////////////////////////////////
-
-fn write_target_f32(
-    endianess: layout::Endian,
-    mut target: &mut [u8],
-    data: f32,
-) -> Result<(), io::Error> {
-    match endianess {
-        layout::Endian::Little => target.write_f32::<LittleEndian>(data),
-        layout::Endian::Big => target.write_f32::<BigEndian>(data),
-    }
-}
-fn write_target_f64(
-    endianess: layout::Endian,
-    mut target: &mut [u8],
-    data: f64,
-) -> Result<(), io::Error> {
-    match endianess {
-        layout::Endian::Little => target.write_f64::<LittleEndian>(data),
-        layout::Endian::Big => target.write_f64::<BigEndian>(data),
-    }
-}
-
-fn read_target_f32(endianess: layout::Endian, mut source: &[u8]) -> Result<f32, io::Error> {
-    match endianess {
-        layout::Endian::Little => source.read_f32::<LittleEndian>(),
-        layout::Endian::Big => source.read_f32::<BigEndian>(),
-    }
-}
-fn read_target_f64(endianess: layout::Endian, mut source: &[u8]) -> Result<f64, io::Error> {
-    match endianess {
-        layout::Endian::Little => source.read_f64::<LittleEndian>(),
-        layout::Endian::Big => source.read_f64::<BigEndian>(),
-    }
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 // Undefined byte tracking
 ////////////////////////////////////////////////////////////////////////////////