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Benchmarks for #116771 (AndyAyersMS) #401

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Description

@EgorBot

Processing dotnet/runtime#116771 (comment) command:

Command

-intel -arm64

using System.Collections.Generic;
using System.Runtime.CompilerServices;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;

[GenericTypeArguments(typeof(string))]
[MemoryDiagnoser]
public class A<T>
{
    private IEnumerable<T> _ienumerable;

    [GlobalSetup(Target = nameof(IEnumerable))]
    public void SetupIEnumerable() => _ienumerable = new string[512] as IEnumerable<T>;

    [Benchmark]
    public T IEnumerable() => Get(_ienumerable);

    [MethodImpl(MethodImplOptions.NoInlining)]
    private T Get(IEnumerable<T> collection)
    {
        T result = default;
        foreach (var item in collection)
            result = item;
        return result;
    }

    private IEnumerable<string> _ienumerable_str;

    [GlobalSetup(Target = nameof(IEnumerable_str))]
    public void SetupIEnumerable_str() => _ienumerable_str = new string[512];

    [Benchmark]
    public string IEnumerable_str() => Get_str(_ienumerable_str);

    [MethodImpl(MethodImplOptions.NoInlining)]
    private string Get_str(IEnumerable<string> collection)
    {
        string result = default;
        foreach (var item in collection)
            result = item;
        return result;
    }
}

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