53 lines
1.1 KiB
C#
53 lines
1.1 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 Mod10UInt128Benchmarks
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{
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[Params(3UL, 8191UL, 131071UL, 2147483647UL)]
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public UInt128 Value { get; set; }
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[Benchmark(Baseline = true)]
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public UInt128 StandardModulo()
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{
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return Value % 10UL;
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}
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[Benchmark]
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public ulong ModWithHighLowModulo()
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{
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// Split and fold under mod 10: 2^64 ≡ 6 (mod 10)
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ulong value = (ulong)Value;
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ulong high = value >> 64;
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ulong low = value;
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ulong highRem = high % 10UL;
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ulong lowRem = low % 10UL;
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ulong combined = lowRem + highRem * 6UL;
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return combined % 10UL;
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}
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[Benchmark]
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public ulong ModWithLoopModulo()
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{
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UInt128 value = Value;
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UInt128 zero = UInt128.Zero;
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if (value == zero)
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return 0UL;
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ulong result = (ulong)value;
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UInt128 high = value >> 64;
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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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return result % 10UL;
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}
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}
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