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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
// In CoreCLR String.Format(ref, ref) is small and readily inlined.
// The inline introduces a System.Parms GC struct local which is
// untracked and must be zero initialized in the prolog. When the
// inlined callsite is in a cold path, the inline hurts performance.
//
// There are two test methods below, one of which calls String.Format
// on a cold path and the other which has similar structure but
// does not call String.Format. Expectation is that they will have
// similar performance.
//
// See https://github.com/dotnet/coreclr/issues/7569 for context.
using Microsoft.Xunit.Performance;
using System;
using System.Runtime.CompilerServices;
using Xunit;
[assembly: OptimizeForBenchmarks]
[assembly: MeasureInstructionsRetired]
namespace Inlining
{
public class InlineGCStruct
{
#if DEBUG
public const int Iterations = 1;
#else
public const int Iterations = 2500000;
#endif
[MethodImpl(MethodImplOptions.NoInlining)]
public static int FastFunctionNotCallingStringFormat(int param)
{
if (param < 0)
{
throw new Exception(String.Format("We do not like the value {0:N0}.", param));
}
if (param == int.MaxValue)
{
throw new Exception(String.Format("{0:N0} is maxed out.", param));
}
if (param > int.MaxValue / 2)
{
throw new Exception(String.Format("We do not like the value {0:N0} either.", param));
}
return param * 2;
}
[MethodImpl(MethodImplOptions.NoInlining)]
public static int FastFunctionNotHavingStringFormat(int param)
{
if (param < 0)
{
throw new ArgumentOutOfRangeException("param", "We do not like this value.");
}
if (param == int.MaxValue)
{
throw new ArgumentOutOfRangeException("param", "Maxed out.");
}
if (param > int.MaxValue / 2)
{
throw new ArgumentOutOfRangeException("param", "We do not like this value either.");
}
return param * 2;
}
[Benchmark]
public static bool WithFormat()
{
int result = 0;
foreach (var iteration in Benchmark.Iterations)
{
using (iteration.StartMeasurement())
{
for (int i = 0; i < Iterations; i++)
{
result |= FastFunctionNotCallingStringFormat(11);
}
}
}
return (result == 22);
}
[Benchmark]
public static bool WithoutFormat()
{
int result = 0;
foreach (var iteration in Benchmark.Iterations)
{
using (iteration.StartMeasurement())
{
for (int i = 0; i < Iterations; i++)
{
result |= FastFunctionNotHavingStringFormat(11);
}
}
}
return (result == 22);
}
public static bool WithoutFormatBase()
{
int result = 0;
for (int i = 0; i < Iterations; i++)
{
result |= FastFunctionNotHavingStringFormat(11);
}
return (result == 22);
}
public static bool WithFormatBase()
{
int result = 0;
for (int i = 0; i < Iterations; i++)
{
result |= FastFunctionNotCallingStringFormat(11);
}
return (result == 22);
}
public static int Main()
{
bool withFormat = WithFormatBase();
bool withoutFormat = WithoutFormatBase();
return (withFormat && withoutFormat ? 100 : -1);
}
}
}
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