Refine Montgomery GPU helpers to avoid kernel branching

PerfectNumbers.Core/Gpu/Kernels/DivisorByDivisorKernels.cs

@@ -17,7 +17,7 @@ internal static class DivisorByDivisorKernels
         }
 
         ulong exponent = exponents[index];
-        hits[index] = ULongExtensions.Pow2MontgomeryModWindowedGpu(divisor, exponent, keepMontgomery: false) == 1UL ? (byte)1 : (byte)0;
+        hits[index] = ULongExtensions.Pow2MontgomeryModWindowedGpuConvertToStandard(divisor, exponent) == 1UL ? (byte)1 : (byte)0;
     }
 
     public static void ComputeRemainderDeltasKernel(Index1D index, ArrayView<ulong> gaps, ArrayView<byte> deltas, byte modulus)
@@ -149,6 +149,6 @@ internal static class DivisorByDivisorKernels
 
         ulong exponent = exponents[index];
 
-        results[index] = ULongExtensions.Pow2MontgomeryModWindowedGpu(divisor, exponent, keepMontgomery: true);
+        results[index] = ULongExtensions.Pow2MontgomeryModWindowedGpuKeepMontgomery(divisor, exponent);
     }
 }

PerfectNumbers.Core/Gpu/Kernels/Pow2MontgomeryKernels.cs

@@ -12,7 +12,7 @@ internal static class Pow2MontgomeryKernels
         MontgomeryDivisorData divisor,
         ArrayView1D<ulong, Stride1D.Dense> results)
     {
-        results[index] = ULongExtensions.Pow2MontgomeryModWindowedGpu(divisor, exponents[index], keepMontgomery: true);
+        results[index] = ULongExtensions.Pow2MontgomeryModWindowedGpuKeepMontgomery(divisor, exponents[index]);
     }
 
     public static void Pow2MontgomeryKernelConvertToStandard(
@@ -21,6 +21,6 @@ internal static class Pow2MontgomeryKernels
         MontgomeryDivisorData divisor,
         ArrayView1D<ulong, Stride1D.Dense> results)
     {
-        results[index] = ULongExtensions.Pow2MontgomeryModWindowedGpu(divisor, exponents[index], keepMontgomery: false);
+        results[index] = ULongExtensions.Pow2MontgomeryModWindowedGpuConvertToStandard(divisor, exponents[index]);
     }
 }

PerfectNumbers.Core/Gpu/Kernels/PrimeOrderKernels.cs

@@ -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)

PerfectNumbers.Core/Gpu/PrimeOrderGpuHeuristics.cs

@@ -652,7 +652,7 @@ internal static partial class PrimeOrderGpuHeuristics
             return 0UL;
         }
 
-        return ULongExtensions.Pow2MontgomeryModWindowedGpu(divisorData, exponent, keepMontgomery: false);
+        return ULongExtensions.Pow2MontgomeryModWindowedGpuConvertToStandard(divisorData, exponent);
     }
 
     private static Action<AcceleratorStream, Index1D, ArrayView1D<ulong, Stride1D.Dense>, MontgomeryDivisorData, ArrayView1D<ulong, Stride1D.Dense>> GetPow2ModKernel(Accelerator accelerator)