mlemanczyk/even-perfect-numbers-scanner
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Fixed regression with ref taken only once while it may move since..

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Marek Lemańczyk committed 2025-09-25 10:31:34 +02:00
1 parent 5bfc9b1c30
commit 05077f7e90
1 file changed
+3 -4
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PerfectNumbers.Core/Gpu/MersenneNumberDivisorByDivisorGpuTester.cs
+3 -4
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@@ -386,7 +386,7 @@ public sealed class MersenneNumberDivisorByDivisorGpuTester : IMersenneNumberDiv
int batchSize, computeCount, i, offset = 0; int batchSize, computeCount, i, offset = 0;
bool useDivisorCycles = owner._useDivisorCycles; bool useDivisorCycles = owner._useDivisorCycles;
ulong exponentSliceRef, residue; ulong residue;
while (offset < primesLength) while (offset < primesLength)
{ {
batchSize = Math.Min(gpuBatchSize, primesLength - offset); batchSize = Math.Min(gpuBatchSize, primesLength - offset);
@@ -426,12 +426,11 @@ public sealed class MersenneNumberDivisorByDivisorGpuTester : IMersenneNumberDiv
exponentSlice = hostSpan[..computeCount]; exponentSlice = hostSpan[..computeCount];
exponentView = exponentsView.SubView(0, computeCount); exponentView = exponentsView.SubView(0, computeCount);
exponentSliceRef = MemoryMarshal.GetReference(exponentSlice); exponentView.CopyFromCPU(ref MemoryMarshal.GetReference(exponentSlice), computeCount);
exponentView.CopyFromCPU(ref exponentSliceRef, computeCount);
resultView = resultsView.SubView(0, computeCount); resultView = resultsView.SubView(0, computeCount);
kernel(computeCount, divisorData, exponentView, resultView); kernel(computeCount, divisorData, exponentView, resultView);
accelerator.Synchronize(); accelerator.Synchronize();
resultView.CopyToCPU(ref exponentSliceRef, computeCount); resultView.CopyToCPU(ref MemoryMarshal.GetReference(exponentSlice), computeCount);
for (i = 0; i < computeCount; i++) for (i = 0; i < computeCount; i++)
{ {