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MersenneNumberDivisorByDivisorCpuTesterWithTemplate optimizations

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mlemanczyk committed 2025-12-19 00:10:09 +01:00
1 parent 4edad10be8
commit 870819dec6
2 files changed
+85 -77
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PerfectNumbers.Core/DivisorGenerator.cs
+22 -25
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@@ -47,19 +47,19 @@ internal static class DivisorGenerator
out SmallPrimesPow2LastNineWithoutLastThree);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static ushort GetDecimalMask(LastDigit lastDigit)
{
return lastDigit switch
{
LastDigit.Seven => DecimalMaskWhenLastIsSeven,
LastDigit.Three => DecimalMaskWhenLastIsThree,
LastDigit.Nine => DecimalMaskWhenLastIsNine,
_ => DecimalMaskOtherwise,
};
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static ushort GetDecimalMask(LastDigit lastDigit) => lastDigit switch
{
LastDigit.Seven => DecimalMaskWhenLastIsSeven,
LastDigit.Three => DecimalMaskWhenLastIsThree,
LastDigit.Nine => DecimalMaskWhenLastIsNine,
_ => DecimalMaskOtherwise,
};
private static void BuildSmallPrimes(
[MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
public static ushort GetDecimalMask(bool lastIsSeven) => lastIsSeven ? DecimalMaskWhenLastIsSeven : DecimalMaskOtherwise;
private static void BuildSmallPrimes(
out uint[] all,
out ulong[] allPow2,
out uint[] lastOne,
@@ -210,6 +210,8 @@ internal static class DivisorGenerator
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static LastDigit GetLastDigit(uint prime)
{
// TODO: Swap the `% 10` usage for ULongExtensions.Mod10 so the hot classification path
// reuses the benchmarked residue helper instead of repeated divisions.
return (prime % 10U) switch
{
1U => LastDigit.One,
@@ -221,20 +223,15 @@ internal static class DivisorGenerator
};
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static bool IsAllowedForLastOne(uint prime, LastDigit lastDigit)
{
// TODO: Swap the `% 10` usage for ULongExtensions.Mod10 so the hot classification path
// reuses the benchmarked residue helper instead of repeated divisions.
return lastDigit switch
{
LastDigit.One or LastDigit.Three or LastDigit.Nine => true,
LastDigit.Seven => prime == 7U,
_ => prime == 11U,
};
}
[MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
private static bool IsAllowedForLastOne(uint prime, LastDigit lastDigit) => lastDigit switch
{
LastDigit.One or LastDigit.Three or LastDigit.Nine => true,
LastDigit.Seven => prime == 7U,
_ => prime == 11U,
};
[MethodImpl(MethodImplOptions.AggressiveInlining)]
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static bool IsAllowedForLastSeven(uint prime, LastDigit lastDigit)
{
// TODO: Route this `% 10` classification through ULongExtensions.Mod10 to match the faster