.NET 7 v .NET String.Equals OrdinalIgnoreCase benchmarks

StringCompareDotNet8Benchmarks.cs

using System.Collections.Generic;
using System;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Columns;
using BenchmarkDotNet.Configs;
using BenchmarkDotNet.Jobs;
using BenchmarkDotNet.Reports;
using BenchmarkDotNet.Environments;

namespace Benchmarks
{
    [Config(typeof(Config))]
    [HideColumns(Column.Job, Column.RatioSD, Column.AllocRatio)]
    [MemoryDiagnoser]
    public class StringCompareDotNet8Benchmarks
    {
        [Benchmark]
        [ArgumentsSource(nameof(TestData))]
        public bool EqualsIgnoreCase(string s1, string s2) =>
            s1.Equals(s2, StringComparison.OrdinalIgnoreCase);

        public static IEnumerable<object[]> TestData()
        {
            yield return new object[]
            {
                @"Hi!", // 3 chars (to make sure overhead is not big)
                @"HI!",
            };

            yield return new object[]
            {
                @"hello!!!", // 8 chars (switches to SIMD)
                @"HELLO!!!",
            };

            yield return new object[]
            {
                @"hello world", // 11 chars (1xV128 + trailing elements)
                @"HELLO WORLD",
            };

            yield return new object[]
            {
                @"C:\prj\runtime-main\src\coreclr\CMakeLists.txt", // 46 chars (5xV128 + trailing elements)
                @"C:\prj\runtime-main\src\CORECLR\CMakeLists.txt",
            };

            yield return new object[]
            {
                @"Good bug reports make it easier for maintainers to verify and root cause the underlying problem. The better a bug report, the faster the problem will be resolved. Ideally, a bug report should contain the following information:", // 226 chars
                @"GOOD bug reports make it easier for maintainers to verify and root cause the underlying problem. The better a bug report, the faster the problem will be resolved. Ideally, a bug report should contain the following information:",
            };
        }

        private class Config : ManualConfig
        {
            public Config()
            {
                //setting compilation configs explicitly to avoid confusion

                AddJob(Job.Default.WithId(".NET7")
                   .WithRuntime(CoreRuntime.Core70)
                   .WithBaseline(true)
                   .WithEnvironmentVariables(
                       new EnvironmentVariable("DOTNET_ReadyToRun", "0"), // Disable AOT
                       new EnvironmentVariable("DOTNET_TC_QuickJitForLoops", "1"), // Enable Quick Jit for loop
                       new EnvironmentVariable("DOTNET_TieredPGO", "1"))); // Turn on layered PGO

                AddJob(Job.Default.WithId(".NET8")
                    .WithRuntime(CoreRuntime.Core80)
                    .WithEnvironmentVariables(
                       new EnvironmentVariable("DOTNET_ReadyToRun", "0"), // Disable AOT
                       new EnvironmentVariable("DOTNET_TC_QuickJitForLoops", "1"), // Enable Quick Jit for loop
                       new EnvironmentVariable("DOTNET_TieredPGO", "1"))); // Turn on layered PGO

                SummaryStyle =
                    SummaryStyle.Default.WithRatioStyle(RatioStyle.Percentage);
            }
        }
    }
}