mlemanczyk/even-perfect-numbers-scanner
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Make GpuUInt128 mutable and update callers

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Marek Lemańczyk committed 2025-09-11 18:38:42 +02:00
1 parent 40477eca5d
commit ab856c4995
6 files changed
+267 -203
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PerfectNumbers.Core/Gpu/MersenneNumberDivisorGpuTester.cs
+6 -5
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@@ -48,10 +48,11 @@ public sealed class MersenneNumberDivisorGpuTester
ulong pow2x = 1UL << x;
ulong y = divisor - pow2x;
var modVal = new GpuUInt128(0UL, divisor);
var baseVal = new GpuUInt128(0UL, pow2x); // 2^x ≡ -y (mod divisor)
var part1 = baseVal.ModPow(q, modVal);
var part2 = GpuUInt128.Pow2Mod(r, modVal);
var rem = part1.MulMod(part2, modVal);
result[0] = rem.High == 0UL && rem.Low == 1UL ? (byte)1 : (byte)0;
var baseVal = new GpuUInt128(0UL, pow2x); // 2^x ≡ -y (mod divisor)
var part1 = baseVal;
part1.ModPow(q, modVal);
var part2 = GpuUInt128.Pow2Mod(r, modVal);
part1.MulMod(part2, modVal);
result[0] = part1.High == 0UL && part1.Low == 1UL ? (byte)1 : (byte)0;
}
}