53 lines
1.4 KiB
C#
53 lines
1.4 KiB
C#
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 HeuristicMultiplyShiftBenchmarks
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{
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private static readonly MultiplyShiftInput[] Inputs =
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[
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new(0x3FFF_FFFF_FFFF_FFFFUL, 3UL, 3, "NearOverflowShift"),
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new(0x2000_0000_0000_0000UL, 7UL, 4, "HalfRange"),
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new(0x1234_5678_9ABC_DEF0UL, 5UL, 5, "MixedBits"),
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new(0x0000_0000_1000_0000UL, 11UL, 3, "Sparse"),
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];
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[ParamsSource(nameof(GetInputs))]
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public MultiplyShiftInput Input { get; set; }
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public static IEnumerable<MultiplyShiftInput> GetInputs()
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{
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return Inputs;
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}
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[Benchmark(Baseline = true)]
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public ulong SafeMultiplyShift()
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{
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return ULongExtensions.MultiplyShiftRight(Input.Value, Input.Multiplier, Input.Shift);
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}
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[Benchmark]
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public ulong ShiftFirstMultiplyShift()
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{
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return ULongExtensions.MultiplyShiftRightShiftFirst(Input.Value, Input.Multiplier, Input.Shift);
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}
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[Benchmark]
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public ulong NaiveMultiplyShift()
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{
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return (Input.Value * Input.Multiplier) >> Input.Shift;
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}
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public readonly record struct MultiplyShiftInput(ulong Value, ulong Multiplier, int Shift, string Name)
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{
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public override string ToString()
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{
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return Name;
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}
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}
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}
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