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stephentoubstephentoub
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Update Enumerable.Min/Max for all IBinaryIntegers (#96605)
The implementations are special-casing most of the built-in ones, in order to delegate to the IBinaryInteger-constrained helper, but it was missing Int128, UInt128, and char. ?hese won't be vectorized, but they'll at least use the more streamlined non-vectorized implementations.
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+20
-3
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4 files changed

+20
-3
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‎src/libraries/System.Linq/src/System/Linq/Max.cs‎

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -319,16 +319,20 @@ public static decimal Max(this IEnumerable<decimal> source)
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comparer ??= Comparer<TSource>.Default;
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322+
// TODO https://github.com/dotnet/csharplang/discussions/6308: Update this to use generic constraint bridging if/when available.
322323
if (typeof(TSource) == typeof(byte) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<byte, MaxCalc<byte>>((IEnumerable<byte>)source);
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if (typeof(TSource) == typeof(sbyte) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<sbyte, MaxCalc<sbyte>>((IEnumerable<sbyte>)source);
324325
if (typeof(TSource) == typeof(ushort) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<ushort, MaxCalc<ushort>>((IEnumerable<ushort>)source);
325326
if (typeof(TSource) == typeof(short) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<short, MaxCalc<short>>((IEnumerable<short>)source);
327+
if (typeof(TSource) == typeof(char) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<char, MaxCalc<char>>((IEnumerable<char>)source);
326328
if (typeof(TSource) == typeof(uint) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<uint, MaxCalc<uint>>((IEnumerable<uint>)source);
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if (typeof(TSource) == typeof(int) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<int, MaxCalc<int>>((IEnumerable<int>)source);
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if (typeof(TSource) == typeof(ulong) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<ulong, MaxCalc<ulong>>((IEnumerable<ulong>)source);
329331
if (typeof(TSource) == typeof(long) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<long, MaxCalc<long>>((IEnumerable<long>)source);
330332
if (typeof(TSource) == typeof(nuint) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<nuint, MaxCalc<nuint>>((IEnumerable<nuint>)source);
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if (typeof(TSource) == typeof(nint) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<nint, MaxCalc<nint>>((IEnumerable<nint>)source);
334+
if (typeof(TSource) == typeof(Int128) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<Int128, MaxCalc<Int128>>((IEnumerable<Int128>)source);
335+
if (typeof(TSource) == typeof(UInt128) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<UInt128, MaxCalc<UInt128>>((IEnumerable<UInt128>)source);
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TSource? value = default;
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using (IEnumerator<TSource> e = source.GetEnumerator())

‎src/libraries/System.Linq/src/System/Linq/MaxMin.cs‎

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -32,7 +32,7 @@ private static T MinMaxInteger<T, TMinMax>(this IEnumerable<T> source)
3232
ThrowHelper.ThrowNoElementsException();
3333
}
3434

35-
if (!Vector128.IsHardwareAccelerated || span.Length < Vector128<T>.Count)
35+
if (!Vector128.IsHardwareAccelerated || !Vector128<T>.IsSupported || span.Length < Vector128<T>.Count)
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{
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value = span[0];
3838
for (int i = 1; i < span.Length; i++)
@@ -43,7 +43,7 @@ private static T MinMaxInteger<T, TMinMax>(this IEnumerable<T> source)
4343
}
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}
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}
46-
else if (!Vector256.IsHardwareAccelerated || span.Length < Vector256<T>.Count)
46+
else if (!Vector256.IsHardwareAccelerated || !Vector256<T>.IsSupported || span.Length < Vector256<T>.Count)
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{
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ref T current = ref MemoryMarshal.GetReference(span);
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ref T lastVectorStart = ref Unsafe.Add(ref current, span.Length - Vector128<T>.Count);
@@ -67,7 +67,7 @@ private static T MinMaxInteger<T, TMinMax>(this IEnumerable<T> source)
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}
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}
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}
70-
else if (!Vector512.IsHardwareAccelerated || span.Length < Vector512<T>.Count)
70+
else if (!Vector512.IsHardwareAccelerated || !Vector512<T>.IsSupported || span.Length < Vector512<T>.Count)
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{
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ref T current = ref MemoryMarshal.GetReference(span);
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ref T lastVectorStart = ref Unsafe.Add(ref current, span.Length - Vector256<T>.Count);

‎src/libraries/System.Linq/src/System/Linq/Min.cs‎

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -297,16 +297,20 @@ public static decimal Min(this IEnumerable<decimal> source)
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comparer ??= Comparer<TSource>.Default;
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300+
// TODO https://github.com/dotnet/csharplang/discussions/6308: Update this to use generic constraint bridging if/when available.
300301
if (typeof(TSource) == typeof(byte) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<byte, MinCalc<byte>>((IEnumerable<byte>)source);
301302
if (typeof(TSource) == typeof(sbyte) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<sbyte, MinCalc<sbyte>>((IEnumerable<sbyte>)source);
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if (typeof(TSource) == typeof(ushort) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<ushort, MinCalc<ushort>>((IEnumerable<ushort>)source);
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if (typeof(TSource) == typeof(short) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<short, MinCalc<short>>((IEnumerable<short>)source);
305+
if (typeof(TSource) == typeof(char) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<char, MinCalc<char>>((IEnumerable<char>)source);
304306
if (typeof(TSource) == typeof(uint) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<uint, MinCalc<uint>>((IEnumerable<uint>)source);
305307
if (typeof(TSource) == typeof(int) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<int, MinCalc<int>>((IEnumerable<int>)source);
306308
if (typeof(TSource) == typeof(ulong) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<ulong, MinCalc<ulong>>((IEnumerable<ulong>)source);
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if (typeof(TSource) == typeof(long) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<long, MinCalc<long>>((IEnumerable<long>)source);
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if (typeof(TSource) == typeof(nuint) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<nuint, MinCalc<nuint>>((IEnumerable<nuint>)source);
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if (typeof(TSource) == typeof(nint) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<nint, MinCalc<nint>>((IEnumerable<nint>)source);
312+
if (typeof(TSource) == typeof(Int128) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<Int128, MinCalc<Int128>>((IEnumerable<Int128>)source);
313+
if (typeof(TSource) == typeof(UInt128) && comparer == Comparer<TSource>.Default) return (TSource)(object)MinMaxInteger<UInt128, MinCalc<UInt128>>((IEnumerable<UInt128>)source);
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311315
TSource? value = default;
312316
using (IEnumerator<TSource> e = source.GetEnumerator())

‎src/libraries/System.Linq/tests/MaxTests.cs‎

Lines changed: 9 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -28,6 +28,9 @@ public static IEnumerable<object[]> Max_AllTypes_TestData()
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yield return new object[] { Shuffler.Shuffle(Enumerable.Range(length, length).Select(i => (short)i)), (short)(length + length - 1) };
2929
yield return new object[] { Shuffler.Shuffle(Enumerable.Range(length, length).Select(i => (short)i).ToArray()), (short)(length + length - 1) };
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31+
yield return new object[] { Shuffler.Shuffle(Enumerable.Range(length, length).Select(i => (char)i)), (char)(length + length - 1) };
32+
yield return new object[] { Shuffler.Shuffle(Enumerable.Range(length, length).Select(i => (char)i).ToArray()), (char)(length + length - 1) };
33+
3134
yield return new object[] { Shuffler.Shuffle(Enumerable.Range(length, length).Select(i => (uint)i)), (uint)(length + length - 1) };
3235
yield return new object[] { Shuffler.Shuffle(Enumerable.Range(length, length).Select(i => (uint)i).ToArray()), (uint)(length + length - 1) };
3336

@@ -54,6 +57,12 @@ public static IEnumerable<object[]> Max_AllTypes_TestData()
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5558
yield return new object[] { Shuffler.Shuffle(Enumerable.Range(length, length).Select(i => (nint)i)), (nint)(length + length - 1) };
5659
yield return new object[] { Shuffler.Shuffle(Enumerable.Range(length, length).Select(i => (nint)i).ToArray()), (nint)(length + length - 1) };
60+
61+
yield return new object[] { Shuffler.Shuffle(Enumerable.Range(length, length).Select(i => (Int128)i)), (Int128)(length + length - 1) };
62+
yield return new object[] { Shuffler.Shuffle(Enumerable.Range(length, length).Select(i => (Int128)i).ToArray()), (Int128)(length + length - 1) };
63+
64+
yield return new object[] { Shuffler.Shuffle(Enumerable.Range(length, length).Select(i => (UInt128)i)), (UInt128)(length + length - 1) };
65+
yield return new object[] { Shuffler.Shuffle(Enumerable.Range(length, length).Select(i => (UInt128)i).ToArray()), (UInt128)(length + length - 1) };
5766
}
5867
}
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