Added new VelocityStream to represent streams in Velocity land.

Src/ILGPU/Runtime/Velocity/VelocityProfilingMarker.cs

@@ -0,0 +1,76 @@
+// ---------------------------------------------------------------------------------------
+//                                        ILGPU
+//                           Copyright (c) 2023 ILGPU Project
+//                                    www.ilgpu.net
+//
+// File: VelocityProfilingMarker.cs
+//
+// This file is part of ILGPU and is distributed under the University of Illinois Open
+// Source License. See LICENSE.txt for details.
+// ---------------------------------------------------------------------------------------
+
+using ILGPU.Resources;
+using System;
+using System.Diagnostics;
+
+namespace ILGPU.Runtime.Velocity
+{
+    /// <summary>
+    /// Represents a point-in-time marker used in Velocity profiling.
+    /// </summary>
+    internal sealed class VelocityProfilingMarker : ProfilingMarker
+    {
+        #region Instance
+
+        internal VelocityProfilingMarker(Accelerator accelerator)
+            : base(accelerator)
+        {
+#if NET7_0_OR_GREATER
+            Timestamp = Stopwatch.GetTimestamp();
+#else
+            Timestamp = DateTime.UtcNow.ToBinary();
+#endif
+        }
+
+        #endregion
+
+        #region Properties
+
+        /// <summary>
+        /// The timestamp this profiling marker was created.
+        /// </summary>
+        public long Timestamp { get; private set; }
+
+        #endregion
+
+        #region Methods
+
+        /// <inheritdoc/>
+        public override void Synchronize() { }
+
+        /// <inheritdoc/>
+        public override TimeSpan MeasureFrom(ProfilingMarker marker)
+        {
+            using var binding = Accelerator.BindScoped();
+
+            return (marker is VelocityProfilingMarker startMarker)
+#if NET7_0_OR_GREATER
+                ? Stopwatch.GetElapsedTime(startMarker.Timestamp, Timestamp)
+#else
+                ? DateTime.FromBinary(Timestamp) -
+                    DateTime.FromBinary(startMarker.Timestamp)
+#endif
+                : throw new ArgumentException(
+                    string.Format(
+                        RuntimeErrorMessages.InvalidProfilingMarker,
+                        GetType().Name,
+                        marker.GetType().Name),
+                    nameof(marker));
+        }
+
+        /// <inheritdoc/>
+        protected override void DisposeAcceleratorObject(bool disposing) { }
+
+        #endregion
+    }
+}

Src/ILGPU/Runtime/Velocity/VelocityStream.cs

@@ -0,0 +1,58 @@
+// ---------------------------------------------------------------------------------------
+//                                        ILGPU
+//                        Copyright (c) 2022-2023 ILGPU Project
+//                                    www.ilgpu.net
+//
+// File: VelocityStream.cs
+//
+// This file is part of ILGPU and is distributed under the University of Illinois Open
+// Source License. See LICENSE.txt for details.
+// ---------------------------------------------------------------------------------------
+
+namespace ILGPU.Runtime.Velocity
+{
+    /// <summary>
+    /// Represents a velocity stream.
+    /// </summary>
+    sealed class VelocityStream : AcceleratorStream
+    {
+        #region Instance
+
+        /// <summary>
+        /// Constructs a new Velocity stream.
+        /// </summary>
+        /// <param name="accelerator">The associated accelerator.</param>
+        internal VelocityStream(Accelerator accelerator)
+            : base(accelerator)
+        { }
+
+        #endregion
+
+        #region Methods
+
+        /// <summary>
+        /// Does not perform any operation.
+        /// </summary>
+        public override void Synchronize() { }
+
+        /// <inheritdoc/>
+        protected override ProfilingMarker AddProfilingMarkerInternal()
+        {
+            using var binding = Accelerator.BindScoped();
+            return new VelocityProfilingMarker(Accelerator);
+        }
+
+        #endregion
+
+        #region IDisposable
+
+        /// <summary>
+        /// Does not perform any operation.
+        /// </summary>
+        protected override void DisposeAcceleratorObject(bool disposing) { }
+
+        #endregion
+    }
+}
+
+