JosephTremoulet

    [Config(typeof(PreviewVs20Config))]
    public unsafe class LoopWithExit
    {
        public int length = 100;

        private string test1;
        private string test2;

        [Setup]
        public void Setup()

JosephTremoulet

using System;
using System.Reflection;
using System.Runtime.CompilerServices;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Configs;
using BenchmarkDotNet.Diagnosers;
using BenchmarkDotNet.Jobs;
using BenchmarkDotNet.Running;
using BenchmarkDotNet.Toolchains.CsProj;
using BenchmarkDotNet.Toolchains.DotNetCli;

JosephTremoulet

// Improved by 14%
static byte TestIndexer5(Span<byte> data, out int z)
{
    byte x = 0;
    z = -1;

    // Write to z here should not be able to modify
    // the span.
    for (var idx = 0; idx < data.Length; idx++)
    {

JosephTremoulet

// Improved by 19%
static byte TestIndexer1(Span<byte> data)
{
    int length = data.Length;
    byte x = 0;

    for (var idx = 0; idx < length; idx++)
    {
        x ^= data[idx];  // <---- bounds check here removed
    }

JosephTremoulet

// Improved by 18%
static byte TestKnownSizeArray(int innerIterationCount)
{
    byte[] a = new byte[1024];
    SetData(a);
    Span<byte> data = new Span<byte>(a);
    byte x = 0;

    for (int i = 0; i < innerIterationCount; i++)
    {

JosephTremoulet

using System;
using System.Diagnostics;

class InvariantExample
{
    int LoadLengths(int[] a, ref int[] b, Action doThings)
    {
        int a_len = a.Length;
        int b_len = b.Length;

JosephTremoulet

        static byte TestIndexer1(Span<byte> data)
        {
            int length = data.Length;
            byte x = 0;


            for (var idx = 0; idx < length; idx++)
            {
                x ^= data[idx];  // Bounds check here now completely removed
            }

JosephTremoulet

        static byte TestKnownSizeArray(int innerIterationCount)
        {
            byte[] a = new byte[1024];
            SetData(a);
            Span<byte> data = new Span<byte>(a);
            byte x = 0;


            for (int i = 0; i < innerIterationCount; i++)
            {

JosephTremoulet

        static byte TestKnownSizeCtor2(byte[] a, int innerIterationCount)
        {
            Span<byte> data1 = new Span<byte>(a, 0, 512);
            Span<byte> data2 = new Span<byte>(a, 512, 512);
            byte x = 0;


            for (int i = 0; i < innerIterationCount; i++)
            {
                x = 0;

JosephTremoulet

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <packageSources>
    <add key="dotnet core" value="https://dotnet.myget.org/F/dotnet-core/api/v3/index.json" />
    <add key="appveyor-bdn" value="https://ci.appveyor.com/nuget/benchmarkdotnet" />
  </packageSources>
</configuration>