mlemanczyk/even-perfect-numbers-scanner
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AscendingdivisorRemainderStepper used in PrimeTesterByLastDigit

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mlemanczyk committed 2025-12-05 14:17:24 +01:00
1 parent b3a325521a
commit 928e847f1f
9 files changed
+210 -268
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PerfectNumbers.Core/Gpu/Kernels/IncrementalKernels.cs
+1 -1
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@@ -27,7 +27,7 @@ internal static class IncrementalKernels
ulong idxMod3 = idx % 3UL;
ulong idxMod5 = idx % 5UL;
// residue automaton
ulong step10 = (exponent.Mod10() << 1).Mod10();
ulong step10 = ((ulong)(exponent.Mod10() << 1)).Mod10();
ulong r10 = q0m10 + (step10 * idx).Mod10();
r10 -= (r10 >= 10UL) ? 10UL : 0UL;
bool shouldCheck = r10 != 5UL; // skip q ≡ 5 (mod 10); other residues handled by r8/r3/r5
PerfectNumbers.Core/Gpu/MersenneNumberIncrementalGpuTester.cs
+1 -1
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@@ -30,7 +30,7 @@ public class MersenneNumberIncrementalGpuTester(GpuKernelType kernelType, bool u
KernelContainer kernels = GpuKernelPool.GetOrAddKernels(acceleratorIndex, stream, KernelType.Pow2ModKernelScan | KernelType.IncrementalKernelScan);
var pow2Kernel = kernels.Pow2Mod!;
var incKernel = kernels.Incremental!;
ulong step10 = (exponent.Mod10() << 1).Mod10();
ulong step10 = ((ulong)(exponent.Mod10() << 1)).Mod10();
ulong step8 = ((exponent & 7UL) << 1) & 7UL;
ulong step3 = ((exponent % 3UL) << 1) % 3UL;
ulong step5 = ((exponent % 5UL) << 1) % 5UL;