mlemanczyk/even-perfect-numbers-scanner
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Add optimized modulo helpers for unsigned integers

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Marek Lemańczyk committed 2025-09-21 10:14:26 +02:00
1 parent 2c2bc62cb2
commit 95a0b030f6
7 files changed
+425 -84
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PerfectNumbers.Core/Gpu/MersenneNumberResidueGpuTester.cs
+1 -4
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@@ -24,10 +24,7 @@ public class MersenneNumberResidueGpuTester(bool useGpuOrder)
UInt128 kStart = 1UL;
byte last = lastIsSeven ? (byte)1 : (byte)0;
var kernel = gpuLease.Pow2ModKernel;
ulong step10 = (exponent.Mod10() << 1).Mod10();
ulong step8 = ((exponent & 7UL) << 1) & 7UL;
ulong step3 = ((exponent % 3UL) << 1) % 3UL;
ulong step5 = ((exponent % 5UL) << 1) % 5UL;
exponent.Mod10_8_5_3Steps(out ulong step10, out ulong step8, out ulong step5, out ulong step3);
GpuUInt128 twoPGpu = (GpuUInt128)twoP;
var orderBuffer = accelerator.Allocate1D<ulong>(batchSize);