mlemanczyk/even-perfect-numbers-scanner
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Switch GPU pow2mod helpers to plain windowed arithmetic

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Marek Lemańczyk committed 2025-10-13 14:21:35 +02:00
1 parent 1916196e89
commit 79695b0c56
5 files changed
+305 -74
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PerfectNumbers.Core/Gpu/MersenneNumberDivisorResidueGpuEvaluator.cs
+8 -6
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@@ -110,12 +110,14 @@ internal sealed class MersenneNumberDivisorResidueGpuEvaluator : IDisposable
ulong exponent = exponents[idx];
ulong modulus = divisorData.Modulus;
if (modulus <= 1UL || (modulus & 1UL) == 0UL)
{
results[idx] = 0UL;
return;
}
// Residue batches only include valid odd moduli, so the defensive check stays commented to avoid re-validating
// the invariant on every iteration.
// if (modulus <= 1UL || (modulus & 1UL) == 0UL)
// {
// results[idx] = 0UL;
// return;
// }
results[idx] = exponent.Pow2ModBinaryGpu(modulus);
results[idx] = exponent.Pow2ModWindowedGpu(modulus);
}
}