Inline read_{un,}signed_leb128 and opaque::Decoder functions.

These functions are all hot in rustc and inlining them speeds up most of
the rustc-benchmarks by 1--2%.

Author: nnethercote

src/libserialize/leb128.rs

@@ -38,6 +38,7 @@ pub fn write_unsigned_leb128(out: &mut Vec<u8>, start_position: usize, mut value
     return position - start_position;
 }
 
+#[inline]
 pub fn read_unsigned_leb128(data: &[u8], start_position: usize) -> (u64, usize) {
     let mut result = 0;
     let mut shift = 0;
@@ -78,6 +79,7 @@ pub fn write_signed_leb128(out: &mut Vec<u8>, start_position: usize, mut value:
     return position - start_position;
 }
 
+#[inline]
 pub fn read_signed_leb128(data: &[u8], start_position: usize) -> (i64, usize) {
     let mut result = 0;
     let mut shift = 0;

src/libserialize/opaque.rs

@@ -179,74 +179,90 @@ macro_rules! read_sleb128 {
 impl<'a> serialize::Decoder for Decoder<'a> {
     type Error = String;
 
+    #[inline]
     fn read_nil(&mut self) -> Result<(), Self::Error> {
         Ok(())
     }
 
+    #[inline]
     fn read_u64(&mut self) -> Result<u64, Self::Error> {
         read_uleb128!(self, u64)
     }
 
+    #[inline]
     fn read_u32(&mut self) -> Result<u32, Self::Error> {
         read_uleb128!(self, u32)
     }
 
+    #[inline]
     fn read_u16(&mut self) -> Result<u16, Self::Error> {
         read_uleb128!(self, u16)
     }
 
+    #[inline]
     fn read_u8(&mut self) -> Result<u8, Self::Error> {
         let value = self.data[self.position];
         self.position += 1;
         Ok(value)
     }
 
+    #[inline]
     fn read_usize(&mut self) -> Result<usize, Self::Error> {
         read_uleb128!(self, usize)
     }
 
+    #[inline]
     fn read_i64(&mut self) -> Result<i64, Self::Error> {
         read_sleb128!(self, i64)
     }
 
+    #[inline]
     fn read_i32(&mut self) -> Result<i32, Self::Error> {
         read_sleb128!(self, i32)
     }
 
+    #[inline]
     fn read_i16(&mut self) -> Result<i16, Self::Error> {
         read_sleb128!(self, i16)
     }
 
+    #[inline]
     fn read_i8(&mut self) -> Result<i8, Self::Error> {
         let as_u8 = self.data[self.position];
         self.position += 1;
         unsafe { Ok(::std::mem::transmute(as_u8)) }
     }
 
+    #[inline]
     fn read_isize(&mut self) -> Result<isize, Self::Error> {
         read_sleb128!(self, isize)
     }
 
+    #[inline]
     fn read_bool(&mut self) -> Result<bool, Self::Error> {
         let value = self.read_u8()?;
         Ok(value != 0)
     }
 
+    #[inline]
     fn read_f64(&mut self) -> Result<f64, Self::Error> {
         let bits = self.read_u64()?;
         Ok(unsafe { ::std::mem::transmute(bits) })
     }
 
+    #[inline]
     fn read_f32(&mut self) -> Result<f32, Self::Error> {
         let bits = self.read_u32()?;
         Ok(unsafe { ::std::mem::transmute(bits) })
     }
 
+    #[inline]
     fn read_char(&mut self) -> Result<char, Self::Error> {
         let bits = self.read_u32()?;
         Ok(::std::char::from_u32(bits).unwrap())
     }
 
+    #[inline]
     fn read_str(&mut self) -> Result<Cow<str>, Self::Error> {
         let len = self.read_usize()?;
         let s = ::std::str::from_utf8(&self.data[self.position..self.position + len]).unwrap();