mlemanczyk/even-perfect-numbers-scanner
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Rename CPU Montgomery multiply and align GPU helper

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Marek Lemańczyk committed 2025-10-28 21:06:40 +01:00
1 parent eaee599f25
commit 3304335072
8 files changed
+87 -64
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PerfectNumbers.Core/ExponentRemainderStepperCpu.cs
+4 -4
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@@ -74,7 +74,7 @@ internal struct ExponentRemainderStepperCpu
// single-block divisor-cycle snapshot so we can skip the powmod entirely and reuse the
// cached Montgomery residue ladder highlighted in MersenneDivisorCycleLengthGpuBenchmarks.
ulong multiplier = delta.Pow2MontgomeryModWindowedCpu(_divisor, keepMontgomery: true);
_currentMontgomery = _currentMontgomery.MontgomeryMultiply(multiplier, _modulus, _nPrime);
_currentMontgomery = _currentMontgomery.MontgomeryMultiplyCpu(multiplier, _modulus, _nPrime);
PreviousExponent = exponent;
return ReduceCurrent();
}
@@ -92,7 +92,7 @@ internal struct ExponentRemainderStepperCpu
// TODO: Reuse the divisor-cycle derived Montgomery delta once the cache exposes single-cycle
// lookups so this branch also avoids recomputing powmods when the snapshot lacks the divisor.
ulong multiplier = delta.Pow2MontgomeryModWindowedCpu(_divisor, keepMontgomery: true);
_currentMontgomery = _currentMontgomery.MontgomeryMultiply(multiplier, _modulus, _nPrime);
_currentMontgomery = _currentMontgomery.MontgomeryMultiplyCpu(multiplier, _modulus, _nPrime);
PreviousExponent = exponent;
return _currentMontgomery == _montgomeryOne;
}
@@ -126,7 +126,7 @@ internal struct ExponentRemainderStepperCpu
// TODO: Once the divisor-cycle cache exposes a direct Montgomery delta, multiply it here instead
// of relying on the caller-provided delta so incremental scans remain in sync with the snapshot
// without computing additional cycles or mutating cache state.
_currentMontgomery = _currentMontgomery.MontgomeryMultiply(montgomeryDelta, _modulus, _nPrime);
_currentMontgomery = _currentMontgomery.MontgomeryMultiplyCpu(montgomeryDelta, _modulus, _nPrime);
PreviousExponent = exponent;
isUnity = _currentMontgomery == _montgomeryOne;
return true;
@@ -138,5 +138,5 @@ internal struct ExponentRemainderStepperCpu
PreviousExponent = exponent;
}
private ulong ReduceCurrent() => _currentMontgomery.MontgomeryMultiply(1UL, _modulus, _nPrime);
private ulong ReduceCurrent() => _currentMontgomery.MontgomeryMultiplyCpu(1UL, _modulus, _nPrime);
}