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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/MersenneNumberLucasLehmerGpuTester.cs
+11 -8
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@@ -526,7 +526,7 @@ public class MersenneNumberLucasLehmerGpuTester
int target = i - limbCount;
var sum = value[target];
var original = sum;
sum = sum.Add(limb);
sum.Add(limb);
value[target] = sum;
value[i] = new GpuUInt128(0UL, 0UL);
if (sum.CompareTo(original) < 0)
@@ -536,7 +536,7 @@ public class MersenneNumberLucasLehmerGpuTester
{
var next = value[j];
var nextOriginal = next;
next = next.Add(1UL);
next.Add(1UL);
value[j] = next;
if (next.CompareTo(nextOriginal) >= 0)
{
@@ -569,7 +569,7 @@ public class MersenneNumberLucasLehmerGpuTester
{
var cur = value[j];
var curOriginal = cur;
cur = cur.Add(carryBits);
cur.Add(carryBits);
value[j] = cur;
carryBits = cur.CompareTo(curOriginal) < 0 ? new GpuUInt128(0UL, 1UL) : new GpuUInt128(0UL, 0UL);
j++;
@@ -756,7 +756,8 @@ public class MersenneNumberLucasLehmerGpuTester
ulong limit = exponent - 2UL;
for (ulong i = 0UL; i < limit; i++)
{
s = SquareModMersenne128(s, exponent).SubMod(2UL, modulus);
s = SquareModMersenne128(s, exponent);
s.SubMod(2UL, modulus);
}
states[idx] = s;
@@ -773,14 +774,16 @@ public class MersenneNumberLucasLehmerGpuTester
{
for (; i < limit; i++)
{
s = SquareModMersenne128(s, exponent).SubMod(2UL, modulus);
s = SquareModMersenne128(s, exponent);
s.SubMod(2UL, modulus);
}
}
else
{
for (; i < limit; i++)
{
s = s.SquareMod(modulus).SubMod(2UL, modulus);
s.SquareMod(modulus);
s.SubMod(2UL, modulus);
}
}
@@ -797,7 +800,7 @@ public class MersenneNumberLucasLehmerGpuTester
// v = low128 + high128 (fold by 128 bits once)
var vHigh = new GpuUInt128(q3, q2);
var vLow = new GpuUInt128(q1, q0);
vLow = vLow.Add(vHigh);
vLow.Add(vHigh);
// Mask to keep only p low bits and fold the carry bits (v >> p)
int topBits = (int)(p % 128UL);
@@ -817,7 +820,7 @@ public class MersenneNumberLucasLehmerGpuTester
while (!carryBits.IsZero)
{
before = vLow;
vLow = vLow.Add(carryBits);
vLow.Add(carryBits);
carryBits = vLow.CompareTo(before) < 0 ? GpuUInt128.One : GpuUInt128.Zero;
}