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Refactor GPU-compatible Mul64 handling

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Marek Lemańczyk committed 2025-09-29 22:35:46 +02:00
1 parent b677e6cdec
commit f63254f0f0
4 files changed
+191 -12
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PerfectNumbers.Core/ULongExtensions.cs
+10 -2
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@@ -155,8 +155,8 @@ public static class ULongExtensions
step3 = (step3 << 1) % 3UL;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static UInt128 Mul64(this ulong a, ulong b) => ((UInt128)a.MulHigh(b) << 64) | (UInt128)(a * b);
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static UInt128 Mul64(this ulong a, ulong b) => ((UInt128)a.MulHigh(b) << 64) | (UInt128)(a * b);
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static ulong MulHigh(this ulong x, ulong y)
@@ -174,6 +174,14 @@ public static class ULongExtensions
return result;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static ulong MulHighGpuCompatible(this ulong x, ulong y)
{
GpuUInt128 product = new(x);
product.Mul64(new GpuUInt128(y));
return product.High;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static ulong ModPow64(this ulong value, ulong exponent, ulong modulus)
{