mlemanczyk/even-perfect-numbers-scanner
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Capture GPU next start for divisor batches

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Marek Lemańczyk committed 2025-10-22 06:43:05 +02:00
1 parent 5b973fb513
commit bae39ad95e
2 files changed
+59 -27
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PerfectNumbers.Core/Gpu/Kernels/DivisorByDivisorKernels.cs
+17
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@@ -21,6 +21,7 @@ internal static class DivisorByDivisorKernels
Index1D index,
ArrayView<ulong> candidates,
ArrayView<ulong> gaps,
ArrayView<GpuUInt128> nextStarts,
GpuUInt128 startValue,
GpuUInt128 stride)
{
@@ -55,6 +56,22 @@ internal static class DivisorByDivisorKernels
GpuUInt128 gapValue = candidateValue;
gapValue.Sub(previousValue);
gaps[globalIndex] = gapValue.Low;
if (globalIndex == 0)
{
// EvenPerfectBitScanner provides a single-element nextStarts view per launch, so the guard stays commented out.
// int nextStartLength = (int)nextStarts.Length;
// if (nextStartLength <= 0)
// {
// return;
// }
ulong candidateCount = (ulong)candidates.Length;
GpuUInt128 nextValue = stride;
nextValue.Mul(candidateCount);
nextValue.Add(startValue);
nextStarts[0] = nextValue;
}
}
public static void ComputeRemainderDeltasKernel(Index1D index, ArrayView<ulong> gaps, ArrayView<byte> deltas, byte modulus)