mlemanczyk/even-perfect-numbers-scanner
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Use LastDigit enum across Mersenne scanners

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Marek Lemańczyk committed 2025-10-26 16:04:05 +01:00
1 parent 43c7bafd5d
commit a83ae56caf
15 files changed
+83 -49
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PerfectNumbers.Core/Cpu/MersenneNumberOrderCpuTester.cs
+2 -2
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@@ -4,7 +4,7 @@ public class MersenneNumberOrderCpuTester(GpuKernelType kernelType)
{
private readonly GpuKernelType _kernelType = kernelType;
public void Scan(ulong exponent, UInt128 twoP, bool lastIsSeven, UInt128 maxK, ref bool isPrime)
public void Scan(ulong exponent, UInt128 twoP, LastDigit lastDigit, UInt128 maxK, ref bool isPrime)
{
UInt128 k = 1UL;
var auto = new MersenneResidueAutomaton(exponent);
@@ -17,7 +17,7 @@ public class MersenneNumberOrderCpuTester(GpuKernelType kernelType)
// TODO: When this lookup misses the snapshot, invoke the configured device to compute the
// single required cycle on demand without persisting it so the CPU order path retains the
// cycle-stepping speedups while honoring the no-extra-cache constraint for large divisors.
int allowMask2 = lastIsSeven ? CpuConstants.LastSevenMask10 : CpuConstants.LastOneMask10;
int allowMask2 = lastDigit == LastDigit.Seven ? CpuConstants.LastSevenMask10 : CpuConstants.LastOneMask10;
bool shouldCheck = ((allowMask2 >> (int)auto.Mod10R) & 1) != 0;
if (shouldCheck)
{