Description
The provided C# code throws an unexpected System.Exception inside $Method2$ when compiled in the Release configuration using .NET 10.0.0.
The issue is a JIT code generation error related to the optimization path activated by the method attributes and repeated execution. The error specifically manifests during the comparison of int? types.
The input values are consistently $999$ and $999$, meaning the comparison $value1 != value2$ should always be $false$. However, the highly optimized JIT-compiled code erroneously evaluates this comparison as $true$, causing the exception.
Reproduction Steps
// 1. Compile the code below using .NET 10.0.0 in Release configuration.
// 2. Run the application.
using System;
using System.Runtime.CompilerServices;
class Program
{
[MethodImpl(MethodImplOptions.NoOptimization)]
static void Main()
{
var test = new Test();
while (true)
{
test.Method1(0, 0, 0, 999, 999);
}
}
}
class Test
{
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public void Method1(int a, int b, int c, int value1, int? value2)
{
Method2(1, 2, 3, value1, value2);
}
public void Method2(long a, int b, int c, int? value1, int? value2)
{
try
{
if (value1 != value2)
{
throw new Exception($"{value1} != {value2}");
}
}
catch
{
throw;
}
}
}Expected behavior
The program should run indefinitely without throwing an exception.
Actual behavior
The program throws $System.Exception$ shortly after startup, indicating the JIT incorrectly evaluated the comparison of two equal non-null $int?$ values in the optimized code.
Regression?
net9.0 in not affected
Known Workarounds
No response
Configuration
OS Name: Windows
OS Version: 10.0.22631
OS Platform: Windows
RID: win-x64
Base Path: C:\Program Files\dotnet\sdk\10.0.100\
Target framework: net10.0
Other information
No response
Description
The provided C# code throws an unexpected System.Exception inside$Method2$ when compiled in the Release configuration using .NET 10.0.0.
The issue is a JIT code generation error related to the optimization path activated by the method attributes and repeated execution. The error specifically manifests during the comparison of int? types.
The input values are consistently$999$ and $999$ , meaning the comparison $value1 != value2$ should always be $false$ . However, the highly optimized JIT-compiled code erroneously evaluates this comparison as $true$ , causing the exception.
Reproduction Steps
// 1. Compile the code below using .NET 10.0.0 in Release configuration.
// 2. Run the application.
Expected behavior
The program should run indefinitely without throwing an exception.
Actual behavior
The program throws$System.Exception$ shortly after startup, indicating the JIT incorrectly evaluated the comparison of two equal non-null $int?$ values in the optimized code.
Regression?
net9.0 in not affected
Known Workarounds
No response
Configuration
OS Name: Windows
OS Version: 10.0.22631
OS Platform: Windows
RID: win-x64
Base Path: C:\Program Files\dotnet\sdk\10.0.100\
Target framework: net10.0
Other information
No response