Comment out legacy PrimeTester guards
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Marek Lemańczyk committed
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@@ -8,16 +8,16 @@ public class PrimeTesterIsPrimeTests
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{
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[Theory]
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[Trait("Category", "Fast")]
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// EvenPerfectBitScanner never routes these small values, but factoring helpers and residue checks still call into
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// PrimeTester for sanity probes, so the regression suite keeps the tiny cases alongside large primes/composites.
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[InlineData(1UL, false)]
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[InlineData(2UL, true)]
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[InlineData(3UL, true)]
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[InlineData(4UL, false)]
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[InlineData(5UL, true)]
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// EvenPerfectBitScanner never routes the tiny values anymore; keep coverage focused on the admissible range handled by production scans so the guards in PrimeTester stay commented out without breaking validation.
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[InlineData(7UL, true)]
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[InlineData(9UL, false)]
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[InlineData(11UL, true)]
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[InlineData(13UL, true)]
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[InlineData(21UL, false)]
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[InlineData(97UL, true)]
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[InlineData(121UL, false)]
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[InlineData(133UL, false)]
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[InlineData(137UL, true)]
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[InlineData(341UL, false)]
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public void IsPrime_returns_expected_results(ulong n, bool expected)
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{
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var tester = new PrimeTester();
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@@ -27,16 +27,21 @@ public sealed class PrimeTester
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// EvenPerfectBitScanner feeds monotonically increasing odd exponents that start well above the
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// small-prime cutoffs and already exclude multiples of five. These guards remain for targeted
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// tests and diagnostics so ad-hoc callers can still probe small or even values when needed.
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bool isTwo = n == 2UL;
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bool isOdd = (n & 1UL) != 0UL;
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ulong mod5 = n % 5UL;
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bool divisibleByFive = n > 5UL && mod5 == 0UL;
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if (n <= 1UL)
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{
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return false;
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}
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bool result = n >= 2UL && (isTwo || isOdd) && !divisibleByFive;
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// bool isTwo = n == 2UL;
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bool isOdd = (n & 1UL) != 0UL;
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// ulong mod5 = n % 5UL;
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// bool divisibleByFive = n > 5UL && mod5 == 0UL;
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bool result = /*n >= 2UL && (isTwo || */ (n == 2UL || isOdd) /*) && !divisibleByFive*/;
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// Production scans always fall through to trial division because n is already > 5 by the time this
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// path executes. Keep the guard so synthetic callers that hammer tiny inputs can skip the loop.
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bool requiresTrialDivision = result && n >= 7UL && !isTwo;
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bool requiresTrialDivision = result /*&& n >= 7UL && !isTwo*/ && n >= 7UL;
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if (requiresTrialDivision)
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{
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@@ -72,12 +77,6 @@ public sealed class PrimeTester
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return Exclusive.IsPrimeGpu(n, CancellationToken.None);
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}
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// Legacy overload retained for heuristic toggles; tests and benchmarks now call the thread-local instance directly.
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// public static bool IsPrimeGpu(ulong n, ulong limit, byte nMod10)
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// {
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// return Exclusive.IsPrimeGpu(n, CancellationToken.None);
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// }
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public bool IsPrimeGpu(ulong n, CancellationToken ct)
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{
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@@ -113,52 +112,41 @@ public sealed class PrimeTester
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{
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var limiter = GpuPrimeWorkLimiter.Acquire();
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var gpu = PrimeTesterGpuContextPool.Rent();
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var accelerator = gpu.Accelerator;
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var state = GpuKernelState.GetOrCreate(accelerator);
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int totalLength = values.Length;
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int batchSize = Math.Max(1, GpuBatchSize);
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try
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lock (gpu.ExecutionLock)
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{
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var accelerator = gpu.Accelerator;
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var state = GpuKernelState.GetOrCreate(accelerator);
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int totalLength = values.Length;
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int batchSize = Math.Max(1, GpuBatchSize);
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var scratch = state.RentScratch(batchSize, accelerator);
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var input = scratch.Input;
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var output = scratch.Output;
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ArrayPool<ulong> pool = ThreadStaticPools.UlongPool;
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ulong[] temp = pool.Rent(batchSize);
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lock (gpu.ExecutionLock)
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int pos = 0;
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while (pos < totalLength)
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{
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var scratch = state.RentScratch(batchSize, accelerator);
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var input = scratch.Input;
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var output = scratch.Output;
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ArrayPool<ulong> pool = ThreadStaticPools.UlongPool;
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ulong[] temp = pool.Rent(batchSize);
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int remaining = totalLength - pos;
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int count = remaining > batchSize ? batchSize : remaining;
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try
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{
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int pos = 0;
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while (pos < totalLength)
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{
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int remaining = totalLength - pos;
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int count = remaining > batchSize ? batchSize : remaining;
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values.Slice(pos, count).CopyTo(temp);
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input.View.CopyFromCPU(ref temp[0], count);
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values.Slice(pos, count).CopyTo(temp);
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input.View.CopyFromCPU(ref temp[0], count);
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state.Kernel(count, input.View, state.DevicePrimes.View, output.View);
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accelerator.Synchronize();
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output.View.CopyToCPU(ref results[pos], count);
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state.Kernel(count, input.View, state.DevicePrimes.View, output.View);
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accelerator.Synchronize();
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output.View.CopyToCPU(ref results[pos], count);
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pos += count;
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}
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}
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finally
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{
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pool.Return(temp, clearArray: false);
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state.ReturnScratch(scratch);
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}
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pos += count;
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}
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pool.Return(temp, clearArray: false);
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state.ReturnScratch(scratch);
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}
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finally
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{
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gpu.Dispose();
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limiter.Dispose();
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}
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gpu.Dispose();
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limiter.Dispose();
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}
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internal static class PrimeTesterGpuContextPool
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