System.Numerics.Tensors SetSlice safety

[soerenwolfers]

Description

new TensorSpan<double>(array: myArrayOfLength1, lengths: new IntPtr[] { 2 }, strides: new IntPtr[]{ 0 })
.SetSlice(new TensorSpan<double>(new double[] {1d, 2d}), new NRange[] { ..2 });

writes the 2d to &myArrayOfLength1 + 1 wherever that may be.

Reproduction Steps

using System.Buffers;
using System.Diagnostics.CodeAnalysis;
using System.Numerics.Tensors;

namespace ConsoleApp1;

public abstract class Program
{
    [Experimental("SYSLIB5001")]
    public static unsafe void Main()
    {
        var ar = new double[1];
        fixed (double* pointer = ar)
        {
            var a = new TensorSpan<double>(ar.AsSpan()[..1], new IntPtr[] { 2 }, new IntPtr[]{ 0 });
            a.SetSlice(new TensorSpan<double>(new double[] {1, 3}), new NRange[] { ..2 });
            var x = *pointer;
            var y = *(pointer + 1);
            Console.WriteLine((x, y));  // (1, 2)
        }
    }
}

Expected behavior

2d should be written to the single entry of the TensorSpan.

Actual behavior

.

Regression?

No response

Known Workarounds

No response

Configuration

.NET8, Ubuntu22, x64

Other information

No response

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[jeffhandley]

This was fixed by @michaelgsharp in #107852 and backported to .NET 9 in #108282.