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Add optimized modulo helpers for unsigned integers

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Marek Lemańczyk committed 2025-09-21 10:14:26 +02:00
1 parent 2c2bc62cb2
commit 95a0b030f6
7 files changed
+425 -84
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PerfectNumbers.Core.Tests/ULongExtensionsTests.cs
+80
View File
@@ -21,6 +21,86 @@ public class ULongExtensionsTests
ULongExtensions.Mod10(value).Should().Be(expected);
}
[Theory]
[Trait("Category", "Fast")]
[InlineData(0UL)]
[InlineData(ulong.MaxValue)]
[InlineData(1234567890123456789UL)]
public void Mod3_matches_operator(ulong value)
{
value.Mod3().Should().Be(value % 3UL);
}
[Theory]
[Trait("Category", "Fast")]
[InlineData(0UL)]
[InlineData(ulong.MaxValue)]
[InlineData(1234567890123456789UL)]
public void Mod5_matches_operator(ulong value)
{
value.Mod5().Should().Be(value % 5UL);
}
[Theory]
[Trait("Category", "Fast")]
[InlineData(0UL)]
[InlineData(ulong.MaxValue)]
[InlineData(1234567890123456789UL)]
public void Mod7_matches_operator(ulong value)
{
value.Mod7().Should().Be(value % 7UL);
}
[Theory]
[Trait("Category", "Fast")]
[InlineData(0UL)]
[InlineData(ulong.MaxValue)]
[InlineData(1234567890123456789UL)]
public void Mod8_matches_operator(ulong value)
{
value.Mod8().Should().Be(value % 8UL);
}
[Theory]
[Trait("Category", "Fast")]
[InlineData(0UL)]
[InlineData(ulong.MaxValue)]
[InlineData(1234567890123456789UL)]
public void Mod11_matches_operator(ulong value)
{
value.Mod11().Should().Be(value % 11UL);
}
[Theory]
[Trait("Category", "Fast")]
[InlineData(0UL)]
[InlineData(ulong.MaxValue)]
[InlineData(1234567890123456789UL)]
public void Mod128_matches_operator(ulong value)
{
value.Mod128().Should().Be(value % 128UL);
}
[Theory]
[Trait("Category", "Fast")]
[InlineData(1UL)]
[InlineData(123456789UL)]
[InlineData(ulong.MaxValue)]
public void Mod10_8_5_3Steps_matches_manual_formula(ulong value)
{
value.Mod10_8_5_3Steps(out ulong step10, out ulong step8, out ulong step5, out ulong step3);
ulong expected10 = ((value % 10UL) << 1) % 10UL;
ulong expected8 = ((value & 7UL) << 1) & 7UL;
ulong expected5 = ((value % 5UL) << 1) % 5UL;
ulong expected3 = ((value % 3UL) << 1) % 3UL;
step10.Should().Be(expected10);
step8.Should().Be(expected8);
step5.Should().Be(expected5);
step3.Should().Be(expected3);
}
[Theory]
[Trait("Category", "Fast")]
[InlineData(2UL, true)]