Increase tests

src/Nethermind.Int256.Test/UnaryOps.cs

@@ -1,7 +1,7 @@
 using System;
-using System.Numerics;
 using System.Collections.Generic;
 using System.Linq;
+using System.Numerics;
 
 namespace Nethermind.Int256.Test
 {
@@ -13,11 +13,17 @@ public static class UnaryOps
             2,
             3,
             short.MaxValue,
+            ushort.MaxValue - 1,
             ushort.MaxValue,
+            ushort.MaxValue + 1,
             int.MaxValue,
+            uint.MaxValue - 1,
             uint.MaxValue,
+            uint.MaxValue + 1ul,
             long.MaxValue,
+            ulong.MaxValue - 1,
             ulong.MaxValue,
+            BigInteger.Parse("080000000000000008000000000000001", System.Globalization.NumberStyles.HexNumber),
             TestNumbers.TwoTo64,
             TestNumbers.TwoTo128,
             TestNumbers.TwoTo192,

src/Nethermind.Int256/UInt256.cs

@@ -1052,6 +1052,8 @@ private static void SubtractWithBorrow(ulong a, ulong b, ref ulong borrow, out u
         [SkipLocalsInit]
         public static void Multiply(in UInt256 x, in UInt256 y, out UInt256 res)
         {
+            const bool Axv512Disabled = true;
+
             // If both inputs fit in 64 bits, use a simple multiplication routine.
             if ((x.u1 | x.u2 | x.u3 | y.u1 | y.u2 | y.u3) == 0)
             {
@@ -1064,7 +1066,7 @@ public static void Multiply(in UInt256 x, in UInt256 y, out UInt256 res)
                 return;
             }
             // Fallback if the required AVX‑512 intrinsics are not supported.
-            if (!Avx512F.IsSupported || !Avx512DQ.IsSupported)
+            if (Axv512Disabled || !Avx512F.IsSupported || !Avx512DQ.IsSupported)
             {
                 ref ulong rx = ref Unsafe.As<UInt256, ulong>(ref Unsafe.AsRef(in x));
                 ref ulong ry = ref Unsafe.As<UInt256, ulong>(ref Unsafe.AsRef(in y));