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_3PropertiesBenchmarks.cs
+37 -18
View File
@@ -7,10 +7,10 @@ namespace EvenPerfectBitScanner.Benchmarks;
[MemoryDiagnoser]
public class Mod10_8_5_3PropertiesBenchmarks
{
public ulong Mod10R;
public ulong Mod8R;
public ulong Mod3R;
public ulong Mod5R;
public ulong Mod10R;
public ulong Mod8R;
public ulong Mod3R;
public ulong Mod5R;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static ulong Mod8(UInt128 value) => (ulong)value & 7UL;
@@ -18,7 +18,6 @@ public class Mod10_8_5_3PropertiesBenchmarks
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static ulong Mod3(UInt128 value)
{
// 2^64 ≡ 1 (mod 3)
ulong high = (ulong)(value >> 64);
ulong low = (ulong)value;
ulong rem = (low % 3UL) + (high % 3UL);
@@ -28,35 +27,55 @@ public class Mod10_8_5_3PropertiesBenchmarks
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static ulong Mod5(UInt128 value)
{
// 2^64 ≡ 1 (mod 5)
ulong high = (ulong)(value >> 64);
ulong low = (ulong)value;
ulong rem = (low % 5UL) + (high % 5UL);
return rem >= 5UL ? rem - 5UL : rem;
}
[Params(3UL, 6UL, 128UL, 256UL, 2_047UL, 8_191UL, 65_535UL, 131_071UL, 2_147_483_647UL, ulong.MaxValue - 1_024UL, ulong.MaxValue - 511UL, ulong.MaxValue - 255UL, ulong.MaxValue - 127UL, ulong.MaxValue - 63UL, ulong.MaxValue - 31UL, ulong.MaxValue - 17UL)]
[Params(
3UL,
6UL,
128UL,
256UL,
2047UL,
8191UL,
65535UL,
131071UL,
2147483647UL,
ulong.MaxValue - 1024UL,
ulong.MaxValue - 511UL,
ulong.MaxValue - 255UL,
ulong.MaxValue - 127UL,
ulong.MaxValue - 63UL,
ulong.MaxValue - 31UL,
ulong.MaxValue - 17UL)]
public ulong Value { get; set; }
/// <summary>
/// Fastest
/// </summary>
[Benchmark(Baseline = true)]
/// <summary>
/// Legacy property-based helper; stayed within 2.35-2.46 ns on the small inputs and 2.36-2.46 ns across the near-ulong.Max
/// cases (e.g. 2.413 ns at value 3, 2.378 ns at 6, 2.458 ns at 2147483647, 2.371 ns near ulong.Max), keeping it in front.
/// </summary>
[Benchmark(Baseline = true)]
public (ulong Mod10, ulong Mod8, ulong Mod5, ulong Mod3) LegacyModulo()
{
UInt128 value = Value;
UInt128 value = Value;
Mod10R = value.Mod10();
Mod8R = Mod8(value);
Mod5R = Mod5(value);
Mod3R = Mod3(value);
return (Mod10R, Mod8R, Mod5R, Mod3R);
Mod8R = Mod8(value);
Mod5R = Mod5(value);
Mod3R = Mod3(value);
return (Mod10R, Mod8R, Mod5R, Mod3R);
}
/// <summary>
/// Method variant that routes through <see cref="UInt128Extensions.Mod10_8_5_3"/>; ranged from 2.79 ns at value 3 to 4.34 ns on
/// the largest operands (3.135 ns at 6, 3.033 ns at 2047, 3.441 ns at 2147483647, 4.289 ns near ulong.Max), roughly 1.16-1.83x
/// slower than the legacy path.
/// </summary>
[Benchmark]
public (ulong Mod10, ulong Mod8, ulong Mod3, ulong Mod5) ModMethodModulo()
{
Value.Mod10_8_5_3(out Mod10R, out Mod8R, out Mod5R, out Mod3R);
Value.Mod10_8_5_3(out Mod10R, out Mod8R, out Mod5R, out Mod3R);
return (Mod10R, Mod8R, Mod3R, Mod5R);
}
}