Optimize T1HAGlobals

Signed-off-by: Xen <lordofxen@deskasoft.com>

Author: LordOfXen

HashifyNet/Algorithms/T1HA/T1HAGlobals.cs

@@ -1,4 +1,4 @@
-// *
+// *
 // *****************************************************************************
 // *
 // * Copyright (c) 2025 Deskasoft International
@@ -27,6 +27,12 @@
 // ******************************************************************************
 // *
 
+#if NET8_0_OR_GREATER
+using System;
+#endif
+
+using System.Runtime.CompilerServices;
+
 namespace HashifyNet.Algorithms.T1HA
 {
 	internal static class T1HAGlobals
@@ -46,5 +52,38 @@ internal static class T1HAGlobals
 		public const ulong PRIME_4 = 0x9C06FAF4D023E3ABUL;
 		public const ulong PRIME_5 = 0xC060724A8424F345UL;
 		public const ulong PRIME_6 = 0xCB5AF53AE3AAAC31UL;
+
+
+#if true
+		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+		private static ulong BigMul_ref(ulong a, ulong b, out ulong low)
+		{
+			unchecked
+			{
+				uint al = (uint)a;
+				uint ah = (uint)(a >> 32);
+				uint bl = (uint)b;
+				uint bh = (uint)(b >> 32);
+
+				ulong mull = ((ulong)al) * bl;
+				ulong t = ((ulong)ah) * bl + (mull >> 32);
+				ulong tl = ((ulong)al) * bh + (uint)t;
+
+				low = tl << 32 | (uint)mull;
+
+				return ((ulong)ah) * bh + (t >> 32) + (tl >> 32);
+			}
+		}
+#endif
+
+		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+		public static void BigMul128(ulong x, ulong y, out ulong lo, out ulong hi)
+		{
+#if NET8_0_OR_GREATER
+			hi = Math.BigMul(x, y, out lo);
+#else
+			hi = BigMul_ref(x, y, out lo);
+#endif
+		}
 	}
 }