Batch allocations, replace all Vector<T> with Vector256

Solver/MCTS.cs

@@ -4,6 +4,7 @@ using System.Diagnostics.Contracts;
 using System.Numerics;
 using System.Runtime.CompilerServices;
 using Node = Craftimizer.Solver.ArenaNode<Craftimizer.Solver.SimulationNode>;
+using System.Runtime.Intrinsics;
 
 namespace Craftimizer.Solver;
 
@@ -66,7 +67,7 @@ public sealed class MCTS
     private static (int arrayIdx, int subIdx) ChildMaxScore(in NodeScoresBuffer scores)
     {
         var length = scores.Count;
-        var vecLength = Vector<float>.Count;
+        var vecLength = Vector256<float>.Count;
 
         var max = (0, 0);
         var maxScore = 0f;
@@ -74,8 +75,7 @@ public sealed class MCTS
         {
             var iterCount = Math.Min(vecLength, length);
 
-            ref var chunk = ref scores.Data[i];
-            var m = new Vector<float>(chunk.MaxScore.Span);
+            var m = scores.Data![i].MaxScore;
 
             var idx = Intrinsics.HMaxIndex(m, iterCount);
 
@@ -116,12 +116,12 @@ public sealed class MCTS
         in NodeScoresBuffer scores)
     {
         var length = scores.Count;
-        var vecLength = Vector<float>.Count;
+        var vecLength = Vector256<float>.Count;
 
         var C = MathF.Sqrt(explorationConstant * MathF.Log(parentVisits));
         var w = maxScoreWeightingConstant;
         var W = 1f - w;
-        var CVector = new Vector<float>(C);
+        var CVector = Vector256.Create(C);
 
         var max = (0, 0);
         var maxScore = 0f;
@@ -129,13 +129,13 @@ public sealed class MCTS
         {
             var iterCount = Math.Min(vecLength, length);
 
-            ref var chunk = ref scores.Data[i];
-            var s = new Vector<float>(chunk.ScoreSum.Span);
-            var vInt = new Vector<int>(chunk.Visits.Span);
-            var m = new Vector<float>(chunk.MaxScore.Span);
+            ref var chunk = ref scores.Data![i];
+            var s = chunk.ScoreSum;
+            var vInt = chunk.Visits;
+            var m = chunk.MaxScore;
 
-            vInt = Vector.Max(vInt, Vector<int>.One);
-            var v = Vector.ConvertToSingle(vInt);
+            vInt = Vector256.Max(vInt, Vector256<int>.One);
+            var v = Vector256.ConvertToSingle(vInt);
 
             var exploitation = W * (s / v) + w * m;
             var exploration = CVector * Intrinsics.ReciprocalSqrt(v);