Enable usage of Vector<T>.Sum on .NET 6

Sergio0694 · Sergio0694 · commit 4109697aa737 · 2021-12-29T18:08:06.000+01:00
See dotnet/runtime#35626
diff --git a/CommunityToolkit.HighPerformance/Helpers/Internals/SpanHelper.Count.cs b/CommunityToolkit.HighPerformance/Helpers/Internals/SpanHelper.Count.cs
@@ -240,7 +240,11 @@ private static nint CountSimd<T>(ref T r0, nint length, T value)
                     offset += Vector<T>.Count;
                 }
 
+#if NET6_0_OR_GREATER
+                result += CastToNativeInt(Vector.Sum(partials));
+#else
                 result += CastToNativeInt(Vector.Dot(partials, Vector<T>.One));
+#endif
                 length -= offset - initialOffset;
             }
             while (length >= Vector<T>.Count);

Original file line number	Diff line number	Diff line change
`@@ -240,7 +240,11 @@ private static nint CountSimd<T>(ref T r0, nint length, T value)`
`240`	`240`	`offset += Vector<T>.Count;`
`241`	`241`	`}`
`242`	`242`
	`243`	`+#if NET6_0_OR_GREATER`
	`244`	`+ result += CastToNativeInt(Vector.Sum(partials));`
	`245`	`+#else`
`243`	`246`	`result += CastToNativeInt(Vector.Dot(partials, Vector<T>.One));`
	`247`	`+#endif`
`244`	`248`	`length -= offset - initialOffset;`
`245`	`249`	`}`
`246`	`250`	`while (length >= Vector<T>.Count);`