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Pow2MontgomeryModWindowedConvertToStandardCpu usages replaced with a comparison to MontgomeryOne avoiding unnecessary conversions. Results updated.

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mlemanczyk committed 2026-01-03 01:37:40 +01:00
1 parent 3f59cdc14b
commit 6b80e31e6c
7 files changed
+57 -34
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PerfectNumbers.Core/PrimeOrderCalculatorTemplate.cs
+4 -4
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@@ -938,7 +938,7 @@ public static partial class PrimeOrderCalculatorTemplate
ulong candidate = order - primeFactor * remainder;
// ulong candidate = order / primeFactor;
if (candidate.Pow2MontgomeryModWindowedConvertToStandardCpu(divisorData) == 1UL)
if (candidate.Pow2MontgomeryModWindowedKeepMontgomeryCpu(divisorData) == divisorData.MontgomeryOne)
{
order = candidate;
continue;
@@ -1674,7 +1674,7 @@ public static partial class PrimeOrderCalculatorTemplate
[MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
private static bool Pow2EqualsOne(ulong exponent, in MontgomeryDivisorData divisorData)
{
return exponent.Pow2MontgomeryModWindowedConvertToStandardCpu(divisorData) == 1UL;
return exponent.Pow2MontgomeryModWindowedKeepMontgomeryCpu(divisorData) == divisorData.MontgomeryOne;
}
#if DEVICE_HYBRID || DEVICE_GPU
@@ -1685,7 +1685,7 @@ public static partial class PrimeOrderCalculatorTemplate
in MontgomeryDivisorData divisorData)
{
// TODO: swap to GPU pow2 when available; fallback to CPU for now.
return exponent.Pow2MontgomeryModWindowedConvertToStandardCpu(divisorData) == 1UL;
return exponent.Pow2MontgomeryModWindowedKeepMontgomeryCpu(divisorData) == divisorData.MontgomeryOne;
}
[MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
@@ -1695,7 +1695,7 @@ public static partial class PrimeOrderCalculatorTemplate
ulong prime,
in MontgomeryDivisorData divisorData)
{
return exponent.Pow2MontgomeryModWindowedConvertToStandardCpu(divisorData) == 1UL;
return exponent.Pow2MontgomeryModWindowedKeepMontgomeryCpu(divisorData) == divisorData.MontgomeryOne;
}
#endif