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Fix Mod10 shortcut and restore Mod10_8_5_3Steps accuracy

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Marek Lemańczyk committed 2025-09-24 00:32:15 +02:00
1 parent 63f3d71ce4
commit 1978f7dfcb
2 files changed
+91 -88
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PerfectNumbers.Core/ULongExtensions.cs
+28 -24
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@@ -85,23 +85,27 @@ public static class ULongExtensions
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
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,
};
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,
};
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static ulong Mod128(this ulong value) => value & 127UL;
@@ -143,14 +147,14 @@ 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)]