mlemanczyk/even-perfect-numbers-scanner
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Benchmark results and TODOs added / updated

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Marek Lemańczyk committed 2025-10-02 15:00:30 +02:00
1 parent 507b9c91f4
commit f9e548279c
31 files changed
+581 -364
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EvenPerfectBitScanner.Benchmarks/Mod10_8_5_3StepsBenchmarks.cs
+15 -12
View File
@@ -9,26 +9,29 @@ public class Mod10_8_5_3StepsBenchmarks
[Params(3UL, 8191UL, 131071UL, 2147483647UL)]
public ulong Value { get; set; }
/// <summary>
/// Legacy step-per-bit helper; required 11.89-13.40 ns per call (12.052 ns at value 3, 11.891 ns at 8191, 13.401 ns at 131071,
/// 12.114 ns at 2147483647), making it 3-4x slower than the streamlined method variant.
/// </summary>
[Benchmark(Baseline = true)]
public (ulong Mod10, ulong Mod8, ulong Mod3, ulong Mod5) LegacyModulo()
{
UInt128 value = Value;
ulong mod10 = (((ulong)(value % 10UL)) << 1) % 10UL;
ulong mod8 = (((ulong)(value & 7UL)) << 1) & 7UL;
ulong mod5 = (((ulong)(value % 5UL)) << 1) % 5UL;
ulong mod3 = (((ulong)(value % 3UL)) << 1) % 3UL;
UInt128 value = Value;
ulong mod10 = (((ulong)(value % 10UL)) << 1) % 10UL;
ulong mod8 = (((ulong)(value & 7UL)) << 1) & 7UL;
ulong mod5 = (((ulong)(value % 5UL)) << 1) % 5UL;
ulong mod3 = (((ulong)(value % 3UL)) << 1) % 3UL;
return (mod10, mod8, mod3, mod5);
}
/// <summary>
/// Fastest
/// </summary>
[Benchmark]
/// <summary>
/// Optimized step helper exposed on <see cref="UInt128Extensions.Mod10_8_5_3Steps"/>; trimmed execution to 3.58-3.77 ns
/// (3.576 ns at value 3, 3.682 ns at 8191, 3.773 ns at 131071, 3.649 ns at 2147483647), giving a 3.2-3.6x speedup.
/// </summary>
[Benchmark]
public (ulong Mod10, ulong Mod8, ulong Mod3, ulong Mod5) ModMethodModulo()
{
Value.Mod10_8_5_3Steps(out ulong mod10, out ulong mod8, out ulong mod5, out ulong mod3);
// Step residues for q += 2*p
Value.Mod10_8_5_3Steps(out ulong mod10, out ulong mod8, out ulong mod5, out ulong mod3);
return (mod10, mod8, mod3, mod5);
}
}