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Refine Montgomery GPU helpers to avoid kernel branching

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Marek Lemańczyk committed 2025-10-22 01:43:10 +02:00
1 parent f12919e220
commit 24eaec7a21
5 files changed
+46 -22
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PerfectNumbers.Core/Gpu/Kernels/PrimeOrderKernels.cs
+3 -3
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@@ -347,7 +347,7 @@ internal static partial class PrimeOrderGpuHeuristics
}
ulong reduced = phi / factor;
if (ULongExtensions.Pow2MontgomeryModWindowedGpu(divisor, reduced, keepMontgomery: false) == 1UL)
if (ULongExtensions.Pow2MontgomeryModWindowedGpuConvertToStandard(divisor, reduced) == 1UL)
{
return false;
}
@@ -1131,7 +1131,7 @@ internal static partial class PrimeOrderGpuHeuristics
private static bool Pow2EqualsOneKernel(ulong exponent, in MontgomeryDivisorData divisor)
{
return ULongExtensions.Pow2MontgomeryModWindowedGpu(divisor, exponent, keepMontgomery: false) == 1UL;
return ULongExtensions.Pow2MontgomeryModWindowedGpuConvertToStandard(divisor, exponent) == 1UL;
}
private static ulong CalculateByDoublingKernel(ulong prime)
@@ -1156,7 +1156,7 @@ internal static partial class PrimeOrderGpuHeuristics
internal static void Pow2ModKernel(Index1D index, ArrayView1D<ulong, Stride1D.Dense> exponents, MontgomeryDivisorData divisor, ArrayView1D<ulong, Stride1D.Dense> remainders)
{
ulong exponent = exponents[index];
remainders[index] = ULongExtensions.Pow2MontgomeryModWindowedGpu(divisor, exponent, keepMontgomery: false);
remainders[index] = ULongExtensions.Pow2MontgomeryModWindowedGpuConvertToStandard(divisor, exponent);
}
private static Action<AcceleratorStream, Index1D, ArrayView1D<GpuUInt128, Stride1D.Dense>, GpuUInt128, ArrayView1D<GpuUInt128, Stride1D.Dense>> GetPow2ModWideKernel(Accelerator accelerator)