mlemanczyk/even-perfect-numbers-scanner
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Clarify cycle stepper reset inlining

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Marek Lemańczyk committed 2025-10-02 13:30:56 +02:00
1 parent 8b467c27f3
commit b8aa845c5c
53 files changed
+1736 -1131
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PerfectNumbers.Core/UIntExtensions.cs
+10 -8
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@@ -4,16 +4,18 @@ namespace PerfectNumbers.Core;
public static class UIntExtensions
{
private const ulong Mod3Mask = 0xAAAAAAABUL;
public const ulong Mod5Mask = 0xCCCCCCCDUL;
private const ulong Mod3Mask = 0xAAAAAAABUL;
public const ulong Mod5Mask = 0xCCCCCCCDUL;
// TODO: Extend this helper set with the Mod7/Mod11 lookup constants so CPU residue automation can drop `%` entirely in
// the small-prime sieves.
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static uint Mod3(uint value) => value - (uint)((value * Mod3Mask) >> 33) * 3U;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static uint Mod3(uint value) => value - (uint)((value * Mod3Mask) >> 33) * 3U;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static uint Mod5(this uint value) => value - (uint)((value * Mod5Mask) >> 34) * 5U;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static uint Mod5(this uint value) => value - (uint)((value * Mod5Mask) >> 34) * 5U;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static uint Mod8(this uint value) => value & 7U;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static uint Mod8(this uint value) => value & 7U;
}