L4 map use no sync fast route when enouge predict ahead

src/Nitload.Common/HighPerformance/Memory/L4.Map.cs

@@ -35,11 +35,16 @@ namespace Nitload.Common.HighPerformance.Memory
                 {
                     try
                     {
-                        Predict();
-                        _ = Interlocked.Exchange(ref _swiss_swap_lock, 1);
-                        while (Volatile.Read(ref _swiss_reader_counter) != 0) { }
+                        int effectivePredictionCount = Predict();
+                        if (effectivePredictionCount > 0)
+                        {
+                            _ = Interlocked.Exchange(ref _swiss_swap_lock, 1);
+                            while (Volatile.Read(ref _swiss_reader_counter) != 0) { }
+
+                            _addressMap.SwapBuffers();
+                            Volatile.Write(ref _predict_count, effectivePredictionCount);
+                        }
 
-                        _addressMap.SwapBuffers();
                         if (_addressMap.TryGet(source, out handle)) {
                             throw new InvalidOperationException($"Unexpected map request: [address source: 0x{source.Address:x16}; layout profile: {source.Description:x16}].");
                         }
@@ -52,7 +57,7 @@ namespace Nitload.Common.HighPerformance.Memory
                 } else if (!TryGetAddress(source, out handle)) {
                     throw new InvalidOperationException($"Unexpected map request: [address source: 0x{source.Address:x16}; layout profile: {source.Description:x16}].");
                 }
-            } else if (!TryGetAddress(source, out handle)) {
+            } else if (!_addressMap.TryGet(source, out handle)) {
                 throw new InvalidOperationException($"Unexpected map request: [address source: 0x{source.Address:x16}; layout profile: {source.Description:x16}].");
             }
 

src/Nitload.Common/HighPerformance/Memory/L4.Predict.cs

@@ -16,7 +16,7 @@ namespace Nitload.Common.HighPerformance.Memory
     public unsafe partial class L4
     {
 
-        internal partial void Predict() { }
+        internal partial int Predict() => 0;
 
     }
 }

src/Nitload.Common/HighPerformance/Memory/L4.cs

@@ -81,7 +81,7 @@ namespace Nitload.Common.HighPerformance.Memory
             return _bufferAllocator.TryAlloc(size, out handle);
         }
 
-        internal partial void Predict();
+        internal partial int Predict();
 
     }
 }