mlemanczyk/even-perfect-numbers-scanner
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Tiny optimization

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Marek Lemańczyk committed 2025-09-24 00:34:13 +02:00
1 parent c1ad705a4a
commit 15bc2686cc
1 file changed
+24 -28
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PerfectNumbers.Core/ULongExtensions.cs
+24 -28
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@@ -85,27 +85,23 @@ public static class ULongExtensions
} }
[MethodImpl(MethodImplOptions.AggressiveInlining)] [MethodImpl(MethodImplOptions.AggressiveInlining)]
public static ulong Mod10(this ulong value) public static ulong Mod10(this ulong value) => (value & 1UL) == 0UL
{ ? (value % 5UL) switch
ulong mod5 = value % 5UL; {
return (value & 1UL) == 0UL 0UL => 0UL,
? mod5 switch 1UL => 6UL,
{ 2UL => 2UL,
0UL => 0UL, 3UL => 8UL,
1UL => 6UL, _ => 4UL,
2UL => 2UL, }
3UL => 8UL, : (value % 5UL) switch
_ => 4UL, {
} 0UL => 5UL,
: mod5 switch 1UL => 1UL,
{ 2UL => 7UL,
0UL => 5UL, 3UL => 3UL,
1UL => 1UL, _ => 9UL,
2UL => 7UL, };
3UL => 3UL,
_ => 9UL,
};
}
[MethodImpl(MethodImplOptions.AggressiveInlining)] [MethodImpl(MethodImplOptions.AggressiveInlining)]
public static ulong Mod128(this ulong value) => value & 127UL; public static ulong Mod128(this ulong value) => value & 127UL;
@@ -147,14 +143,14 @@ public static class ULongExtensions
} }
[MethodImpl(MethodImplOptions.AggressiveInlining)] [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) 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); value.Mod10_8_5_3(out step10, out step8, out step5, out step3);
step10 = (step10 << 1).Mod10(); step10 = (step10 << 1).Mod10();
step8 = (step8 << 1) & 7UL; step8 = (step8 << 1) & 7UL;
step5 = (step5 << 1) % 5UL; step5 = (step5 << 1) % 5UL;
step3 = (step3 << 1) % 3UL; step3 = (step3 << 1) % 3UL;
} }
[MethodImpl(MethodImplOptions.AggressiveInlining)] [MethodImpl(MethodImplOptions.AggressiveInlining)]