mlemanczyk/even-perfect-numbers-scanner
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Extension methods benchmarked. Slower alternatives replaced.

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Marek Lemańczyk committed 2025-09-23 22:01:09 +02:00
1 parent 9becb8df67
commit 6e99ee39e3
40 files changed
+930 -1026
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PerfectNumbers.Core/UIntExtensions.cs
+8 -20
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@@ -4,28 +4,16 @@ namespace PerfectNumbers.Core;
public static class UIntExtensions
{
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static uint Mod3(this uint value) => value % 3U;
private const ulong Mod3Mask = 0xAAAAAAABUL;
public const ulong Mod5Mask = 0xCCCCCCCDUL;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static uint Mod5(this uint value) => value % 5U;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static uint Mod3(uint value) => value - (uint)((value * Mod3Mask) >> 33) * 3U;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static uint Mod6(this uint value) => value % 6U;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static uint Mod5(this uint value) => value - (uint)((value * Mod5Mask) >> 34) * 5U;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static uint Mod7(this uint value) => value % 7U;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static uint Mod8(this uint value) => value & 7U;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static uint Mod10(this uint value) => value % 10U;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static uint Mod11(this uint value) => value % 11U;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static uint Mod128(this uint value) => value & 127U;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static uint Mod8(this uint value) => value & 7U;
}