Add vectorized Count<T> support for nint/nuint

Author: Sergio0694

CommunityToolkit.HighPerformance/Helpers/Internals/SpanHelper.Count.cs

@@ -69,6 +69,17 @@ public static nint Count<T>(ref T r0, nint length, T value)
             return CountSimd(ref r1, length, target);
         }
 
+#if NET6_0_OR_GREATER
+        if (typeof(T) == typeof(nint) ||
+            typeof(T) == typeof(nuint))
+        {
+            ref nint r1 = ref Unsafe.As<T, nint>(ref r0);
+            nint target = Unsafe.As<T, nint>(ref value);
+
+            return CountSimd(ref r1, length, target);
+        }
+#endif
+
         return CountSequential(ref r0, length, value);
     }
 
@@ -320,6 +331,13 @@ private static unsafe nint GetUpperBound<T>()
             return (nint)(void*)long.MaxValue;
         }
 
+#if NET6_0_OR_GREATER
+        if (typeof(T) == typeof(nint))
+        {
+            return nint.MaxValue;
+        }
+#endif
+
         throw null!;
     }
 
@@ -353,6 +371,13 @@ private static nint CastToNativeInt<T>(T value)
             return (nint)(ulong)(long)(object)value;
         }
 
+#if NET6_0_OR_GREATER
+        if (typeof(T) == typeof(nint))
+        {
+            return (nint)(object)value;
+        }
+#endif
+
         throw null!;
     }
 }

tests/CommunityToolkit.HighPerformance.UnitTests/Extensions/Test_ReadOnlySpanExtensions.Count.cs

@@ -4,7 +4,6 @@
 
 using System;
 using System.Runtime.InteropServices;
-using CommunityToolkit.HighPerformance;
 using CommunityToolkit.HighPerformance.UnitTests.Buffers.Internals;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 
@@ -49,6 +48,15 @@ public void Test_ReadOnlySpanExtensions_RandomCount64()
         TestForType(Math.PI, CreateRandomData);
     }
 
+#if NET6_0_OR_GREATER
+    [TestMethod]
+    public void Test_ReadOnlySpanExtensions_RandomCountPtr()
+    {
+        TestForType(nint.MaxValue / 2, CreateRandomData);
+        TestForType(nuint.MaxValue / 2, CreateRandomData);
+    }
+#endif
+
     [TestMethod]
     public void Test_ReadOnlySpanExtensions_RandomCountManaged()
     {
@@ -148,6 +156,15 @@ public void Test_ReadOnlySpanExtensions_FilledCount64()
         TestForType((ulong)47128480128401, (count, _) => CreateFilledData(count, (ulong)47128480128401));
     }
 
+#if NET6_0_OR_GREATER
+    [TestMethod]
+    public void Test_ReadOnlySpanExtensions_FilledCountPtr()
+    {
+        TestForType((nint)37438941, (count, _) => CreateFilledData(count, (nint)37438941));
+        TestForType((nuint)37438941, (count, _) => CreateFilledData(count, (nuint)37438941));
+    }
+#endif
+
     /// <summary>
     /// Performs a test for a specified type.
     /// </summary>