45 lines
1.3 KiB
C#
45 lines
1.3 KiB
C#
using System.Runtime.CompilerServices;
|
|
using BenchmarkDotNet.Attributes;
|
|
using BenchmarkDotNet.Jobs;
|
|
|
|
namespace EvenPerfectBitScanner.Benchmarks;
|
|
|
|
[SimpleJob(RuntimeMoniker.Net80, launchCount: 1, warmupCount: 1, iterationCount: 5)]
|
|
[MemoryDiagnoser]
|
|
public class Mod7ULongBenchmarks
|
|
{
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
public static ulong Mod7(ulong value)
|
|
{
|
|
ulong remainder = ((uint)value % 7U) + (((uint)(value >> 32) % 7U) << 2);
|
|
while (remainder >= 7UL)
|
|
{
|
|
remainder -= 7UL;
|
|
}
|
|
|
|
return remainder;
|
|
}
|
|
|
|
[Params(7UL, 8191UL, 131071UL, 2147483647UL, ulong.MaxValue - 63UL)]
|
|
public ulong Value { get; set; }
|
|
|
|
/// <summary>
|
|
/// `% 7` baseline; 0.274 ns at value 7, 0.270 ns at 8191, 0.268 ns at 131071, 0.270 ns at 2147483647, and 0.275 ns near ulong.Max.
|
|
/// </summary>
|
|
[Benchmark(Baseline = true)]
|
|
public ulong ModuloOperator()
|
|
{
|
|
return Value % 7UL;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Extension helper; 0.433 ns at value 7, 0.443 ns at 8191, 0.436 ns at 131071, 0.438 ns at 2147483647, but 0.684 ns near
|
|
/// ulong.Max—about 1.6-2.5x slower overall.
|
|
/// </summary>
|
|
[Benchmark]
|
|
public ulong ExtensionMethod()
|
|
{
|
|
return Mod7(Value);
|
|
}
|
|
}
|