73 lines
3.0 KiB
C#
73 lines
3.0 KiB
C#
using System.Runtime.CompilerServices;
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using BenchmarkDotNet.Attributes;
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using BenchmarkDotNet.Jobs;
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using PerfectNumbers.Core;
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namespace EvenPerfectBitScanner.Benchmarks;
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[SimpleJob(RuntimeMoniker.Net80, launchCount: 1, warmupCount: 1, iterationCount: 5)]
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[MemoryDiagnoser]
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public class Mod3Benchmarks
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{
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private static readonly ModBenchmarkCase[] Cases =
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[
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new(ModNumericType.UInt32, 3U, "UInt32:3"),
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new(ModNumericType.UInt32, 2047U, "UInt32:2047"),
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new(ModNumericType.UInt32, 65535U, "UInt32:65535"),
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new(ModNumericType.UInt32, 2147483647U, "UInt32:2147483647"),
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new(ModNumericType.UInt64, 3UL, "UInt64:3"),
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new(ModNumericType.UInt64, 8191UL, "UInt64:8191"),
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new(ModNumericType.UInt64, 131071UL, "UInt64:131071"),
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new(ModNumericType.UInt64, 2147483647UL, "UInt64:2147483647"),
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new(ModNumericType.UInt64, ulong.MaxValue - 17UL, "UInt64:Max-17"),
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new(ModNumericType.UInt128, 3UL, "UInt128:3"),
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new(ModNumericType.UInt128, 8191UL, "UInt128:8191"),
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new(ModNumericType.UInt128, 131071UL, "UInt128:131071"),
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new(ModNumericType.UInt128, 2147483647UL, "UInt128:2147483647"),
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new(ModNumericType.UInt128, ulong.MaxValue - 17UL, "UInt128:Max-17"),
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];
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static ulong Mod3(ulong value) =>
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((uint)(value & ULongExtensions.WordBitMask)
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+ (uint)((value >> 16) & ULongExtensions.WordBitMask)
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+ (uint)((value >> 32) & ULongExtensions.WordBitMask)
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+ (uint)((value >> 48) & ULongExtensions.WordBitMask)) % 3UL;
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public static IEnumerable<ModBenchmarkCase> GetCases() => Cases;
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/// <summary>
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/// `% 3` baseline across all widths; previously landed at 0.03-0.09 ns on <c>uint</c>, 0.26-0.49 ns on <c>ulong</c>,
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/// and 2.88-2.97 ns on <see cref="UInt128"/> inputs throughout the merged dataset.
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/// </summary>
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[Benchmark(Baseline = true)]
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[ArgumentsSource(nameof(GetCases))]
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public ulong ModuloOperator(ModBenchmarkCase data)
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{
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return data.Type switch
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{
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ModNumericType.UInt32 => (uint)data.Value % 3U,
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ModNumericType.UInt64 => (ulong)data.Value % 3UL,
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ModNumericType.UInt128 => (ulong)(data.Value % 3UL),
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_ => throw new ArgumentOutOfRangeException(nameof(data)),
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};
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}
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/// <summary>
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/// Extension helpers that fold operands by width; they matched the modulo noise floor on <c>uint</c>, trailed by
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/// ~1.5-1.7× on <c>ulong</c>, and delivered a 6.4× speedup on <see cref="UInt128"/>.
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/// </summary>
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[Benchmark]
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[ArgumentsSource(nameof(GetCases))]
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public ulong ExtensionMethod(ModBenchmarkCase data)
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{
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return data.Type switch
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{
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ModNumericType.UInt32 => UIntExtensions.Mod3((uint)data.Value),
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ModNumericType.UInt64 => Mod3((ulong)data.Value),
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ModNumericType.UInt128 => data.Value.Mod3(),
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_ => throw new ArgumentOutOfRangeException(nameof(data)),
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};
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}
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}
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