From 15bc2686ccfa7178c99bf94220d3a6f1d16b74f2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marek=20Lema=C5=84czyk?= <marek@lemanczyk.eu>
Date: Wed, 24 Sep 2025 00:34:13 +0200
Subject: [PATCH] Tiny optimization

---
 PerfectNumbers.Core/ULongExtensions.cs | 54 ++++++++++++--------------
 1 file changed, 25 insertions(+), 29 deletions(-)

diff --git a/PerfectNumbers.Core/ULongExtensions.cs b/PerfectNumbers.Core/ULongExtensions.cs
index 7fadfa1..fd67bf7 100644
--- a/PerfectNumbers.Core/ULongExtensions.cs
+++ b/PerfectNumbers.Core/ULongExtensions.cs
@@ -85,27 +85,23 @@ public static class ULongExtensions
 	}
 
 	[MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static ulong Mod10(this ulong value)
-        {
-                ulong mod5 = value % 5UL;
-                return (value & 1UL) == 0UL
-                        ? mod5 switch
-                        {
-                                0UL => 0UL,
-                                1UL => 6UL,
-                                2UL => 2UL,
-                                3UL => 8UL,
-                                _ => 4UL,
-                        }
-                        : mod5 switch
-                        {
-                                0UL => 5UL,
-                                1UL => 1UL,
-                                2UL => 7UL,
-                                3UL => 3UL,
-                                _ => 9UL,
-                        };
-        }
+	public static ulong Mod10(this ulong value) => (value & 1UL) == 0UL
+			? (value % 5UL) switch
+			{
+				0UL => 0UL,
+				1UL => 6UL,
+				2UL => 2UL,
+				3UL => 8UL,
+				_ => 4UL,
+			}
+			: (value % 5UL) switch
+			{
+				0UL => 5UL,
+				1UL => 1UL,
+				2UL => 7UL,
+				3UL => 3UL,
+				_ => 9UL,
+			};
 
 	[MethodImpl(MethodImplOptions.AggressiveInlining)]
 	public static ulong Mod128(this ulong value) => value & 127UL;
@@ -147,14 +143,14 @@ public static class ULongExtensions
 	}
 
 	[MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static void Mod10_8_5_3Steps(this ulong value, out ulong step10, out ulong step8, out ulong step5, out ulong step3)
-        {
-                value.Mod10_8_5_3(out step10, out step8, out step5, out step3);
+	public static void Mod10_8_5_3Steps(this ulong value, out ulong step10, out ulong step8, out ulong step5, out ulong step3)
+	{
+		value.Mod10_8_5_3(out step10, out step8, out step5, out step3);
 
-                step10 = (step10 << 1).Mod10();
-                step8 = (step8 << 1) & 7UL;
-                step5 = (step5 << 1) % 5UL;
-                step3 = (step3 << 1) % 3UL;
+		step10 = (step10 << 1).Mod10();
+		step8 = (step8 << 1) & 7UL;
+		step5 = (step5 << 1) % 5UL;
+		step3 = (step3 << 1) % 3UL;
 	}
 
 	[MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -394,7 +390,7 @@ public static class ULongExtensions
 		// Reusing result after resetting it for the rotation-driven accumulation phase.
 		result = one;
 		UInt128 rotationCount = exponent % cycleLength;
-		
+
 		// We're reusing "zero" as rotation index for just a little better performance
 		while (zero < rotationCount)
 		{