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Use intrinsics in TensorPrimitives.LeadingZeroCount #98275

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Use intrinsics in TensorPrimitives.LeadingZeroCount #98275

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51 changes: 47 additions & 4 deletions ...s/System.Numerics.Tensors/src/System/Numerics/Tensors/netcore/TensorPrimitives.netcore.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -18683,11 +18683,54 @@ public static Vector512<T> Invoke(Vector512<T> x)
/// <summary>T.LeadingZeroCount(x)</summary>
internal readonly struct LeadingZeroCountOperator<T> : IUnaryOperator<T, T> where T : IBinaryInteger<T>
{
public static bool Vectorizable => false; // TODO: Vectorize
public static bool Vectorizable =>
(Avx512CD.VL.IsSupported && (sizeof(T) == 4 || sizeof(T) == 8)) ||
(AdvSimd.IsSupported && (sizeof(T) == 1 || sizeof(T) == 2 || sizeof(T) == 4));

public static T Invoke(T x) => T.LeadingZeroCount(x);
public static Vector128<T> Invoke(Vector128<T> x) => throw new NotSupportedException();
public static Vector256<T> Invoke(Vector256<T> x) => throw new NotSupportedException();
public static Vector512<T> Invoke(Vector512<T> x) => throw new NotSupportedException();

[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static Vector128<T> Invoke(Vector128<T> x)
{
if (Avx512CD.VL.IsSupported)
{
if (sizeof(T) == 4) return Avx512CD.VL.LeadingZeroCount(x.AsUInt32()).As<uint, T>();
if (sizeof(T) == 8) return Avx512CD.VL.LeadingZeroCount(x.AsUInt64()).As<ulong, T>();
}

if (AdvSimd.IsSupported)
{
if (sizeof(T) == 1) return AdvSimd.LeadingZeroCount(x.AsByte()).As<byte, T>();
if (sizeof(T) == 2) return AdvSimd.LeadingZeroCount(x.AsUInt16()).As<ushort, T>();
if (sizeof(T) == 4) return AdvSimd.LeadingZeroCount(x.AsUInt32()).As<uint, T>();
}

throw new NotSupportedException();
}

[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static Vector256<T> Invoke(Vector256<T> x)
{
if (Avx512CD.VL.IsSupported)
{
if (sizeof(T) == 4) return Avx512CD.VL.LeadingZeroCount(x.AsUInt32()).As<uint, T>();
if (sizeof(T) == 8) return Avx512CD.VL.LeadingZeroCount(x.AsUInt64()).As<ulong, T>();
}

return Vector256.Create(Invoke(x.GetLower()), Invoke(x.GetUpper()));
}

[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static Vector512<T> Invoke(Vector512<T> x)
{
if (Avx512CD.IsSupported)
{
if (sizeof(T) == 4) return Avx512CD.LeadingZeroCount(x.AsUInt32()).As<uint, T>();
if (sizeof(T) == 8) return Avx512CD.LeadingZeroCount(x.AsUInt64()).As<ulong, T>();
}

return Vector512.Create(Invoke(x.GetLower()), Invoke(x.GetUpper()));
}
}

/// <summary>T.TrailingZeroCount(x)</summary>
Expand Down