65 lines
1.9 KiB
C#
65 lines
1.9 KiB
C#
using BenchmarkDotNet.Attributes;
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using PerfectNumbers.Core;
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namespace EvenPerfectBitScanner.Benchmarks;
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[MemoryDiagnoser]
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public class Mod10_8_5_3Benchmarks
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{
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[Params(3UL, 8191UL, 131071UL, 2147483647UL)]
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public ulong Value { get; set; }
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/// <summary>
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/// Fastest
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/// </summary>
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[Benchmark(Baseline = true)]
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public (ulong Mod10, ulong Mod8, ulong Mod3, ulong Mod5) ModuloOperator()
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{
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ulong value = Value;
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return (value % 10UL, value % 8UL, value % 3UL, value % 5UL);
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}
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[Benchmark]
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public (ulong Mod10, ulong Mod8, ulong Mod3, ulong Mod5) LegacyModulo()
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{
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ulong mod10, mod8, mod3, mod5;
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UInt128 zero = UInt128.Zero;
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if (Value == zero)
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{
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mod3 = 0UL;
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mod5 = 0UL;
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mod8 = 0UL;
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mod10 = 0UL;
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return (mod10, mod8, mod3, mod5);
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}
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UInt128 high = Value >> 64;
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ulong result = Value;
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mod8 = result & 7UL;
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// 2^64 ≡ 1 (mod 3)
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ulong modRem = (result % 3UL) + ((ulong)high % 3UL);
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mod3 = modRem >= 3UL ? modRem - 3UL : modRem;
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// 2^64 ≡ 1 (mod 5)
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modRem = (result % 5UL) + ((ulong)high % 5UL);
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mod5 = modRem >= 5UL ? modRem - 5UL : modRem;
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while (high != zero)
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{
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// 2^64 ≡ 6 (mod 10)
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result = (result + (ulong)high * 6UL) % 10UL;
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high >>= 64;
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}
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mod10 = result % 10UL;
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return (mod10, mod8, mod3, mod5);
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}
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[Benchmark]
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public (ulong Mod10, ulong Mod8, ulong Mod3, ulong Mod5) ModMethodModulo()
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{
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Value.Mod10_8_5_3(out ulong mod10, out ulong mod8, out ulong mod5, out ulong mod3);
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return (mod10, mod8, mod3, mod5);
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}
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}
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