mlemanczyk/even-perfect-numbers-scanner
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Inline GpuUInt128 Mul64 helper

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Marek Lemańczyk committed 2025-10-20 13:30:34 +02:00
1 parent 9c08cf48a7
commit 1809ba95b3
8 files changed
+108 -114
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PerfectNumbers.Core/Gpu/Kernels/Pow2ModKernels.cs
+2 -2
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@@ -64,7 +64,7 @@ internal static class Pow2ModKernels
// TODO: kStart is modified after this. Is this expected?
kStart.Add(idx);
GpuUInt128 q = twoP;
q.Mul64(kStart);
GpuUInt128.Mul64(ref q, kStart.High, kStart.Low);
q.Add(GpuUInt128.One);
ReadOnlyGpuUInt128 readOnlyQ = q.AsReadOnly();
if (q.High == 0UL && q.Low < (ulong)smallCycles.Length)
@@ -158,7 +158,7 @@ internal static class Pow2ModKernels
GpuUInt128 k = kStart + (GpuUInt128)idx;
GpuUInt128 q = twoP;
q.Mul64(k);
GpuUInt128.Mul64(ref q, k.High, k.Low);
q.Add(GpuUInt128.One);
ReadOnlyGpuUInt128 readOnlyQ = q.AsReadOnly();
// Small-cycles in-kernel early rejection from device table