45 lines
1.5 KiB
C#
45 lines
1.5 KiB
C#
using System.Runtime.CompilerServices;
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namespace PerfectNumbers.Core;
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internal static partial class PrimeOrderCalculator
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{
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internal enum PrimeOrderMode
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{
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Heuristic,
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Strict,
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}
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internal readonly struct PrimeOrderSearchConfig(uint smallFactorLimit, int pollardRhoMilliseconds, int maxPowChecks, PrimeOrderMode mode)
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{
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private static PrimeOrderSearchConfig _heuristicDefault = CreateHeuristicDefault(UnboundedTaskScheduler.ConfiguredThreadCount);
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public static PrimeOrderSearchConfig HeuristicDefault
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{
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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get => _heuristicDefault;
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}
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public static readonly PrimeOrderSearchConfig StrictDefault = new(smallFactorLimit: 1_000_000, pollardRhoMilliseconds: 0, maxPowChecks: 0, PrimeOrderMode.Strict);
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public static void ConfigureHeuristicDefault(int threadCount)
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{
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_heuristicDefault = CreateHeuristicDefault(threadCount);
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}
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public static PrimeOrderSearchConfig CreateHeuristicDefault(int threadCount)
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{
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int normalizedThreadCount = threadCount < 1 ? 1 : threadCount;
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return new(smallFactorLimit: 100_000, pollardRhoMilliseconds: normalizedThreadCount * 24, maxPowChecks: 24, PrimeOrderMode.Heuristic);
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}
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public readonly uint SmallFactorLimit = smallFactorLimit;
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public readonly int PollardRhoMilliseconds = pollardRhoMilliseconds;
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public readonly int MaxPowChecks = maxPowChecks;
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public readonly PrimeOrderMode Mode = mode;
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}
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// TODO: Remove branching on the CPU / GPU paths
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// TODO: Split big non-static functions into smaller / extract static code to limit JIT time
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}
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