Performance fix for double/float on read

src/ProtocolBuffers.Test/CompatTests/CompatibilityTests.cs

@@ -15,107 +15,6 @@ namespace Google.ProtocolBuffers.CompatTests
             where TMessage : IMessageLite<TMessage, TBuilder>
             where TBuilder : IBuilderLite<TMessage, TBuilder>;
 
-        #region RunBenchmark
-
-        protected void RunBenchmark<TMessage, TBuilder>(byte[] buffer, bool write)
-            where TMessage : IMessageLite<TMessage, TBuilder>
-            where TBuilder : IBuilderLite<TMessage, TBuilder>, new()
-        {
-            TBuilder builder = new TBuilder();
-            TMessage message = new TBuilder().MergeFrom(buffer).Build();
-            System.Diagnostics.Stopwatch watch = new System.Diagnostics.Stopwatch();
-            //simple warm-up
-            object content = SerializeMessage<TMessage, TBuilder>(message);
-            Assert.AreEqual(message, DeerializeMessage<TMessage, TBuilder>(content, new TBuilder(), ExtensionRegistry.Empty).Build());
-            //timming
-            long time = 0, sample = 1;
-            while (time < 100)
-            {
-                sample *= 10;
-                watch.Reset();
-                watch.Start();
-                if (write)
-                {
-                    for (int i = 0; i < sample; i++)
-                        SerializeMessage<TMessage, TBuilder>(message);
-                }
-                else
-                {
-                    for (int i = 0; i < sample; i++)
-                        DeerializeMessage<TMessage, TBuilder>(content, builder, ExtensionRegistry.Empty);
-                }
-                watch.Stop();
-                time = watch.ElapsedMilliseconds;
-            }
-
-            ulong rounds = (ulong)((100.0 / watch.ElapsedMilliseconds) * sample);
-            //test
-            watch.Reset();
-            watch.Start();
-
-            if (write)
-            {
-                for (ulong i = 0; i < rounds; i++)
-                    SerializeMessage<TMessage, TBuilder>(message);
-            }
-            else
-            {
-                for (ulong i = 0; i < rounds; i++)
-                    DeerializeMessage<TMessage, TBuilder>(content, builder, ExtensionRegistry.Empty);
-            }
-
-            watch.Stop();
-            System.Diagnostics.Trace.TraceInformation(
-                "\r\n{0} {4} {5} {3:n0} rps ({1:n0} rounds in {2:n0} ms)", typeof(TMessage).Name, rounds,
-                watch.ElapsedMilliseconds, (1000.0 / watch.ElapsedMilliseconds) * (double)rounds, TestName, write ? " write" : " read");
-            GC.GetTotalMemory(true);
-            GC.WaitForPendingFinalizers();
-        }
-
-        [Test]
-        public virtual void Message1OptimizeSizeWriterPerf()
-        {
-            RunBenchmark<SizeMessage1, SizeMessage1.Builder>(TestResources.google_message1, true);
-        }
-        [Test]
-        public virtual void Message1OptimizeSpeedWriterPerf()
-        {
-            RunBenchmark<SpeedMessage1, SpeedMessage1.Builder>(TestResources.google_message1, true);
-        }
-        [Test]
-        public virtual void Message2OptimizeSizeWriterPerf()
-        {
-            RunBenchmark<SizeMessage2, SizeMessage2.Builder>(TestResources.google_message2, true);
-        }
-        [Test]
-        public virtual void Message2OptimizeSpeedWriterPerf()
-        {
-            RunBenchmark<SpeedMessage2, SpeedMessage2.Builder>(TestResources.google_message2, true);
-        }
-
-        [Test]
-        public virtual void Message1OptimizeSizeReadPerf()
-        {
-            RunBenchmark<SizeMessage1, SizeMessage1.Builder>(TestResources.google_message1, false);
-        }
-        [Test]
-        public virtual void Message1OptimizeSpeedReadPerf()
-        {
-            RunBenchmark<SpeedMessage1, SpeedMessage1.Builder>(TestResources.google_message1, false);
-        }
-        [Test]
-        public virtual void Message2OptimizeSizeReadPerf()
-        {
-            RunBenchmark<SizeMessage2, SizeMessage2.Builder>(TestResources.google_message2, false);
-        }
-        [Test]
-        public virtual void Message2OptimizeSpeedReadPerf()
-        {
-            RunBenchmark<SpeedMessage2, SpeedMessage2.Builder>(TestResources.google_message2, false);
-        }
-        
-        #endregion
-
         [Test]
         public virtual void RoundTripMessage1OptimizeSize()
         {

src/ProtocolBuffers.Test/CompatTests/TextCompatibilityTests.cs

@@ -22,17 +22,6 @@ namespace Google.ProtocolBuffers.CompatTests
             return builder;
         }
 
-        [Test, Explicit, Description("This test can take a very long time to run.")]
-        public override void Message2OptimizeSizeReadPerf()
-        {
-            base.Message2OptimizeSizeReadPerf();
-        }
-        [Test, Explicit, Description("This test can take a very long time to run.")]
-        public override void Message2OptimizeSpeedReadPerf()
-        {
-            base.Message2OptimizeSpeedReadPerf();
-        }
-
         [Test, Explicit, Description("This test can take a very long time to run.")]
         public override void RoundTripMessage2OptimizeSize()
         {
@@ -44,17 +33,5 @@ namespace Google.ProtocolBuffers.CompatTests
         {
             base.RoundTripMessage2OptimizeSpeed();
         }
-
-        [Test, Explicit, Description("This test can take a very long time to run.")]
-        public override void Message2OptimizeSizeWriterPerf()
-        {
-            base.Message2OptimizeSizeWriterPerf();
-        }
-        [Test, Explicit, Description("This test can take a very long time to run.")]
-        public override void Message2OptimizeSpeedWriterPerf()
-        {
-            base.Message2OptimizeSpeedWriterPerf();
-        }
-
     }
 }
\ No newline at end of file

src/ProtocolBuffers/CodedInputStream.cs

@@ -204,15 +204,22 @@ namespace Google.ProtocolBuffers
         public bool ReadDouble(ref double value)
         {
 #if SILVERLIGHT2 || COMPACT_FRAMEWORK_35
-            byte[] rawBytes = ReadRawBytes(8);
-            if (!BitConverter.IsLittleEndian) 
-                Array.Reverse(rawBytes);
-            value = BitConverter.ToDouble(rawBytes, 0);
-            return true;
+            if (BitConverter.IsLittleEndian && 8 <= bufferSize - bufferPos)
+            {
+                value = BitConverter.ToDouble(buffer, bufferPos);
+                bufferPos += 8;
+            }
+            else
+            {
+                byte[] rawBytes = ReadRawBytes(8);
+                if (!BitConverter.IsLittleEndian) 
+                    Array.Reverse(rawBytes);
+                value = BitConverter.ToDouble(rawBytes, 0);
+            }
 #else
             value = BitConverter.Int64BitsToDouble((long) ReadRawLittleEndian64());
-            return true;
 #endif
+            return true;
         }
 
         /// <summary>
@@ -220,10 +227,18 @@ namespace Google.ProtocolBuffers
         /// </summary>
         public bool ReadFloat(ref float value)
         {
-            byte[] rawBytes = ReadRawBytes(4);
-            if (!BitConverter.IsLittleEndian)
-                Array.Reverse(rawBytes);
-            value = BitConverter.ToSingle(rawBytes, 0);
+            if (BitConverter.IsLittleEndian && 4 <= bufferSize - bufferPos)
+            {
+                value = BitConverter.ToSingle(buffer, bufferPos);
+                bufferPos += 4;
+            }
+            else
+            {
+                byte[] rawBytes = ReadRawBytes(4);
+                if (!BitConverter.IsLittleEndian)
+                    Array.Reverse(rawBytes);
+                value = BitConverter.ToSingle(rawBytes, 0);
+            }
             return true;
         }