FIX: On a computer that is running the .NET Framework 3.5 Service Pack 1, the JIT compiler and the Native Image Generator (Ngen.exe) that use the Mscorjit.dll file may generate incorrect code

Applies To
.NET Framework 3.5 Service Pack 1

Symptoms

On a computer that is running the Microsoft .NET Framework 3.5 Service Pack 1 (SP1), the just-in-time (JIT) compiler and the Native Image Generator (Ngen.exe) that use the Mscorjit.dll file may generate incorrect code. Therefore, a 32-bit Managed C++ application may produce incorrect results.

This problem occurs if the following conditions are true:

  • The struct or the class in the source code has less than four scalar varieties and no managed object references.
  • You use the Cpblk instruction or the Initblk instruction.

Note This problem does not occur in a 64-bit application.

Cause

This problem occurs because of a regression in the .NET Framework 3.5 SP1.

Resolution

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

To download this hotfix from the MSDN Code Gallery, visit the following Microsoft Web site:

http:⁠//code.msdn.microsoft.com/KB957542
Note The MSDN Code Gallery displays the languages for which the hotfix is available. If you do not see your language listed, it is because the Code Gallery resource page is not available for that language.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:

http:⁠//support.microsoft.com/contactus/?ws=support Note If you have a 32-bit application that runs on a 64-bit platform, apply the hotfix for the 64-bit version to resolve this problem.

Prerequisites

You must have the .NET Framework 3.5 SP1 installed to apply this hotfix.

Restart requirement

You may have to restart the computer if any of the files that are updated are being used.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows 2000, Windows XP, and Windows Server 2003, x86 versions

File name File version File size Date Time
Mscordacwks.dll 2.0.50727.3068 992,264 16-Sep-2008 13:13
Mscorjit.dll 2.0.50727.3068 367,104 16-Sep-2008 13:13
Mscorlib.dll 2.0.50727.3068 4,546,560 16-Sep-2008 13:13
Mscorwks.dll 2.0.50727.3068 5,815,808 16-Sep-2008 13:13

Windows 2000, Windows XP, and Windows Server 2003, x64 versions

File name File version File size Date Time Platform
Mscordacwks.dll 2.0.50727.3068 992,264 16-Sep-2008 13:13 x86
Mscorjit.dll 2.0.50727.3068 367,104 16-Sep-2008 13:13 x86
Mscorlib.dll 2.0.50727.3068 4,546,560 16-Sep-2008 13:13 x86
Mscorwks.dll 2.0.50727.3068 5,815,808 16-Sep-2008 13:13 x86
Mscordacwks.dll 2.0.50727.3068 1,767,944 16-Sep-2008 10:33 x64
Mscorjit.dll 2.0.50727.3068 1,580,032 16-Sep-2008 10:33 x64
Mscorlib.dll 2.0.50727.3068 4,562,944 16-Sep-2008 10:33 x64
Mscorwks.dll 2.0.50727.3068 10,079,744 16-Sep-2008 10:33 x64

Windows 2000, Windows XP, and Windows Server 2003, IA-64 versions

File name File version File size Date Time Platform
Mscordacwks.dll 2.0.50727.3068 992,264 16-Sep-2008 13:13 x86
Mscorjit.dll 2.0.50727.3068 367,104 16-Sep-2008 13:13 x86
Mscorlib.dll 2.0.50727.3068 4,546,560 16-Sep-2008 13:13 x86
Mscorwks.dll 2.0.50727.3068 5,815,808 16-Sep-2008 13:13 x86
Mscordacwks.dll 2.0.50727.3068 3,087,880 16-Sep-2008 10:44 IA-64
Mscorjit.dll 2.0.50727.3068 2,560,512 16-Sep-2008 10:44 IA-64
Mscorlib.dll 2.0.50727.3068 4,005,888 16-Sep-2008 10:44 IA-64
Mscorwks.dll 2.0.50727.3068 20,153,856 16-Sep-2008 10:44 IA-64

Windows Vista Service Pack 1 (SP1) and Windows Server 2008, x86 versions

File name File version File size Date Time Platform
Mscorlib.resources.dll 2.0.50727.3053 352,256 15-Sep-2008 22:25 x86
Mscorlib.resources.dll 2.0.50727.3053 303,104 15-Sep-2008 22:25 x86
Mscorlib.resources.dll 2.0.50727.3053 299,008 15-Sep-2008 22:25 x86
Mscorlib.resources.dll 2.0.50727.3053 315,392 27-Jul-2008 17:58 x86
Mscorlib.resources.dll 2.0.50727.3053 425,984 15-Sep-2008 22:25 x86
Mscorlib.resources.dll 2.0.50727.3053 307,200 27-Jul-2008 17:58 x86
Mscorlib.resources.dll 2.0.50727.3053 299,008 15-Sep-2008 22:25 x86
Mscorlib.resources.dll 2.0.50727.3053 311,296 27-Jul-2008 17:58 x86
Mscorlib.resources.dll 2.0.50727.3053 331,776 15-Sep-2008 22:25 x86
Mscorlib.resources.dll 2.0.50727.3053 315,392 15-Sep-2008 22:25 x86
Mscorlib.resources.dll 2.0.50727.3053 307,200 27-Jul-2008 17:55 x86
Mscorlib.resources.dll 2.0.50727.3053 348,160 27-Jul-2008 17:58 x86
Mscorlib.resources.dll 2.0.50727.3053 319,488 27-Jul-2008 17:55 x86
Mscorlib.resources.dll 2.0.50727.3053 290,816 15-Sep-2008 22:25 x86
Mscorlib.resources.dll 2.0.50727.3053 303,104 15-Sep-2008 22:25 x86
Mscorlib.resources.dll 2.0.50727.3053 311,296 15-Sep-2008 22:25 x86
Mscorlib.resources.dll 2.0.50727.3053 303,104 27-Jul-2008 17:55 x86
Mscorlib.resources.dll 2.0.50727.3053 307,200 15-Sep-2008 22:25 x86
Mscorlib.resources.dll 2.0.50727.1434 397,312 11-Jan-2008 22:59 x86
Mscorlib.resources.dll 2.0.50727.3053 299,008 15-Sep-2008 22:25 x86
Mscorlib.resources.dll 2.0.50727.3053 299,008 15-Sep-2008 22:25 x86
Mscorlib.resources.dll 2.0.50727.3053 278,528 27-Jul-2008 17:55 x86
Mscorlib.resources.dll 2.0.50727.3053 278,528 27-Jul-2008 17:55 x86
Big5.nlp Not Applicable 66,728 18-Dec-2007 21:03 Not Applicable
Bopomofo.nlp Not Applicable 82,172 18-Dec-2007 21:03 Not Applicable
Ksc.nlp Not Applicable 116,756 18-Dec-2007 21:04 Not Applicable
Mscorlib.dll 2.0.50727.3068 4,546,560 01-Oct-2008 22:27 x86
Normidna.nlp Not Applicable 59,342 18-Dec-2007 21:05 Not Applicable
Normnfc.nlp Not Applicable 45,794 18-Dec-2007 21:05 Not Applicable
Normnfd.nlp Not Applicable 39,284 18-Dec-2007 21:05 Not Applicable
Normnfkc.nlp Not Applicable 66,384 18-Dec-2007 21:05 Not Applicable
Normnfkd.nlp Not Applicable 60,294 18-Dec-2007 21:05 Not Applicable
Prc.nlp Not Applicable 83,748 18-Dec-2007 21:05 Not Applicable
Prcp.nlp Not Applicable 83,748 18-Dec-2007 21:05 Not Applicable
Sortkey.nlp Not Applicable 262,148 18-Dec-2007 21:05 Not Applicable
Sorttbls.nlp Not Applicable 20,320 18-Dec-2007 21:05 Not Applicable
Xjis.nlp Not Applicable 28,288 18-Dec-2007 21:05 Not Applicable
Mscordacwks.dll 2.0.50727.3068 992,264 01-Oct-2008 22:27 x86
Mscorjit.dll 2.0.50727.3068 367,104 24-Sep-2008 22:21 x86
Mscorwks.dll 2.0.50727.3068 5,815,808 01-Oct-2008 22:27 x86

Windows Vista SP1 and Windows Server 2008, x64 versions

File name File version File size Date Time Platform
Big5.nlp Not Applicable 66,728 18-Dec-2007 21:01 Not Applicable
Bopomofo.nlp Not Applicable 82,172 18-Dec-2007 21:01 Not Applicable
Ksc.nlp Not Applicable 116,756 18-Dec-2007 21:02 Not Applicable
Mscorlib.dll 2.0.50727.3068 4,562,944 01-Oct-2008 22:25 x64
Normidna.nlp Not Applicable 59,342 18-Dec-2007 21:03 Not Applicable
Normnfc.nlp Not Applicable 45,794 18-Dec-2007 21:03 Not Applicable
Normnfd.nlp Not Applicable 39,284 18-Dec-2007 21:03 Not Applicable
Normnfkc.nlp Not Applicable 66,384 18-Dec-2007 21:03 Not Applicable
Normnfkd.nlp Not Applicable 60,294 18-Dec-2007 21:03 Not Applicable
Prc.nlp Not Applicable 83,748 18-Dec-2007 21:03 Not Applicable
Prcp.nlp Not Applicable 83,748 18-Dec-2007 21:03 Not Applicable
Sortkey.nlp Not Applicable 262,148 18-Dec-2007 21:03 Not Applicable
Sorttbls.nlp Not Applicable 20,320 18-Dec-2007 21:03 Not Applicable
Xjis.nlp Not Applicable 28,288 18-Dec-2007 21:03 Not Applicable
Mscordacwks.dll 2.0.50727.3068 1,767,944 01-Oct-2008 22:25 x64
Mscorjit.dll 2.0.50727.3068 1,580,032 24-Sep-2008 23:06 x64
Mscorwks.dll 2.0.50727.3068 10,079,744 01-Oct-2008 22:25 x64
Mscorlib.resources.dll 2.0.50727.3053 352,256 15-Sep-2008 22:26 x86
Mscorlib.resources.dll 2.0.50727.3053 303,104 15-Sep-2008 22:25 x86
Mscorlib.resources.dll 2.0.50727.3053 299,008 15-Sep-2008 22:26 x86
Mscorlib.resources.dll 2.0.50727.3053 315,392 27-Jul-2008 18:02 x86
Mscorlib.resources.dll 2.0.50727.3053 425,984 15-Sep-2008 22:26 x86
Mscorlib.resources.dll 2.0.50727.3053 307,200 27-Jul-2008 18:02 x86
Mscorlib.resources.dll 2.0.50727.3053 299,008 15-Sep-2008 22:26 x86
Mscorlib.resources.dll 2.0.50727.3053 311,296 27-Jul-2008 18:02 x86
Mscorlib.resources.dll 2.0.50727.3053 331,776 15-Sep-2008 22:26 x86
Mscorlib.resources.dll 2.0.50727.3053 315,392 15-Sep-2008 22:25 x86
Mscorlib.resources.dll 2.0.50727.3053 307,200 27-Jul-2008 17:56 x86
Mscorlib.resources.dll 2.0.50727.3053 348,160 27-Jul-2008 18:02 x86
Mscorlib.resources.dll 2.0.50727.3053 319,488 27-Jul-2008 17:56 x86
Mscorlib.resources.dll 2.0.50727.3053 290,816 15-Sep-2008 22:26 x86
Mscorlib.resources.dll 2.0.50727.3053 303,104 15-Sep-2008 22:25 x86
Mscorlib.resources.dll 2.0.50727.3053 311,296 15-Sep-2008 22:25 x86
Mscorlib.resources.dll 2.0.50727.3053 303,104 27-Jul-2008 17:56 x86
Mscorlib.resources.dll 2.0.50727.3053 307,200 15-Sep-2008 22:25 x86
Mscorlib.resources.dll 2.0.50727.1434 397,312 11-Jan-2008 22:59 x86
Mscorlib.resources.dll 2.0.50727.3053 299,008 15-Sep-2008 22:25 x86
Mscorlib.resources.dll 2.0.50727.3053 299,008 15-Sep-2008 22:25 x86
Mscorlib.resources.dll 2.0.50727.3053 278,528 27-Jul-2008 17:56 x86
Mscorlib.resources.dll 2.0.50727.3053 278,528 27-Jul-2008 17:56 x86
Big5.nlp Not Applicable 66,728 18-Dec-2007 21:03 Not Applicable
Bopomofo.nlp Not Applicable 82,172 18-Dec-2007 21:03 Not Applicable
Ksc.nlp Not Applicable 116,756 18-Dec-2007 21:04 Not Applicable
Mscorlib.dll 2.0.50727.3068 4,546,560 01-Oct-2008 22:27 x86
Normidna.nlp Not Applicable 59,342 18-Dec-2007 21:05 Not Applicable
Normnfc.nlp Not Applicable 45,794 18-Dec-2007 21:05 Not Applicable
Normnfd.nlp Not Applicable 39,284 18-Dec-2007 21:05 Not Applicable
Normnfkc.nlp Not Applicable 66,384 18-Dec-2007 21:05 Not Applicable
Normnfkd.nlp Not Applicable 60,294 18-Dec-2007 21:05 Not Applicable
Prc.nlp Not Applicable 83,748 18-Dec-2007 21:05 Not Applicable
Prcp.nlp Not Applicable 83,748 18-Dec-2007 21:05 Not Applicable
Sortkey.nlp Not Applicable 262,148 18-Dec-2007 21:05 Not Applicable
Sorttbls.nlp Not Applicable 20,320 18-Dec-2007 21:05 Not Applicable
Xjis.nlp Not Applicable 28,288 18-Dec-2007 21:05 Not Applicable
Mscordacwks.dll 2.0.50727.3068 992,264 01-Oct-2008 22:27 x86
Mscorjit.dll 2.0.50727.3068 367,104 24-Sep-2008 22:21 x86
Mscorwks.dll 2.0.50727.3068 5,815,808 01-Oct-2008 22:27 x86

Windows Vista SP1 and Windows Server 2008, IA-64 versions

File name File version File size Date Time Platform
Big5.nlp Not Applicable 66,728 18-Dec-2007 21:06 Not Applicable
Bopomofo.nlp Not Applicable 82,172 18-Dec-2007 21:06 Not Applicable
Ksc.nlp Not Applicable 116,756 18-Dec-2007 21:06 Not Applicable
Mscorlib.dll 2.0.50727.3068 4,005,888 01-Oct-2008 22:26 IA-64
Normidna.nlp Not Applicable 59,342 18-Dec-2007 21:08 Not Applicable
Normnfc.nlp Not Applicable 45,794 18-Dec-2007 21:08 Not Applicable
Normnfd.nlp Not Applicable 39,284 18-Dec-2007 21:08 Not Applicable
Normnfkc.nlp Not Applicable 66,384 18-Dec-2007 21:08 Not Applicable
Normnfkd.nlp Not Applicable 60,294 18-Dec-2007 21:08 Not Applicable
Prc.nlp Not Applicable 83,748 18-Dec-2007 21:08 Not Applicable
Prcp.nlp Not Applicable 83,748 18-Dec-2007 21:08 Not Applicable
Sortkey.nlp Not Applicable 262,148 18-Dec-2007 21:08 Not Applicable
Sorttbls.nlp Not Applicable 20,320 18-Dec-2007 21:08 Not Applicable
Xjis.nlp Not Applicable 28,288 18-Dec-2007 21:08 Not Applicable
Mscordacwks.dll 2.0.50727.3068 3,087,880 01-Oct-2008 22:26 IA-64
Mscorjit.dll 2.0.50727.3068 2,560,512 24-Sep-2008 23:14 IA-64
Mscorwks.dll 2.0.50727.3068 20,153,856 01-Oct-2008 22:26 IA-64
Mscorlib.resources.dll 2.0.50727.3053 315,392 27-Jul-2008 17:58 x86
Mscorlib.resources.dll 2.0.50727.3053 311,296 27-Jul-2008 17:58 x86
Mscorlib.resources.dll 2.0.50727.3053 348,160 27-Jul-2008 17:58 x86
Mscorlib.resources.dll 2.0.50727.3053 319,488 27-Jul-2008 17:58 x86
Mscorlib.resources.dll 2.0.50727.3053 278,528 27-Jul-2008 17:58 x86
Mscorlib.resources.dll 2.0.50727.3053 278,528 27-Jul-2008 17:59 x86
Big5.nlp Not Applicable 66,728 18-Dec-2007 21:03 Not Applicable
Bopomofo.nlp Not Applicable 82,172 18-Dec-2007 21:03 Not Applicable
Ksc.nlp Not Applicable 116,756 18-Dec-2007 21:04 Not Applicable
Mscorlib.dll 2.0.50727.3068 4,546,560 01-Oct-2008 22:27 x86
Normidna.nlp Not Applicable 59,342 18-Dec-2007 21:05 Not Applicable
Normnfc.nlp Not Applicable 45,794 18-Dec-2007 21:05 Not Applicable
Normnfd.nlp Not Applicable 39,284 18-Dec-2007 21:05 Not Applicable
Normnfkc.nlp Not Applicable 66,384 18-Dec-2007 21:05 Not Applicable
Normnfkd.nlp Not Applicable 60,294 18-Dec-2007 21:05 Not Applicable
Prc.nlp Not Applicable 83,748 18-Dec-2007 21:05 Not Applicable
Prcp.nlp Not Applicable 83,748 18-Dec-2007 21:05 Not Applicable
Sortkey.nlp Not Applicable 262,148 18-Dec-2007 21:05 Not Applicable
Sorttbls.nlp Not Applicable 20,320 18-Dec-2007 21:05 Not Applicable
Xjis.nlp Not Applicable 28,288 18-Dec-2007 21:05 Not Applicable
Mscordacwks.dll 2.0.50727.3068 992,264 01-Oct-2008 22:27 x86
Mscorjit.dll 2.0.50727.3068 367,104 24-Sep-2008 22:21 x86
Mscorwks.dll 2.0.50727.3068 5,815,808 01-Oct-2008 22:27 x86

Workaround

To work around this problem, use one of the following methods.

Method 1

If the application code resembles the sample code in the "More Information" section, locate the following line of code.

#define GETVECTOR3D(vec3d) (*reinterpret_cast<AcGeVector3d*>(&((vec3d).m_x))

Change this line of code as follows.

#define GETVECTOR3D(vec3d) (*reinterpret_cast<AcGeVector3d*>(&((vec3d)))

Method 2

Deploy an .ini file. To do this, create a file that contains the following code.

[.NET Framework Debugging Control]
AllowOptimize=0

Name the .ini file the same as the problematic module, but use the .ini extension instead of the .dll extension. For example, for the sample code in the "More Information" section, name the .ini file the Bug.ini file. Put the Bug.ini file in the same directory as the Bug.dll file.

Note The drawback of this method is the potential performance effect for no optimizations. If you use the Native Image Generator (Ngen.exe) to precompile the module, this method is not applicable.

Method 3

Selectively apply the NoOptimization option of the MethodImplOptions enumeration to the problematic methods by using the MethodImplAttribute class.

Note This method disables the optimizations for the JIT compiler and for the Native Image Generator (Ngen.exe) on a per-method level. How much the performance is affected varies, depending on the method.

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

Steps to reproduce the problem

  1. Create a C++ application that is based on the .NET Framework 3.5 SP1.

  2. Add a .cpp file to the project, name this file the Bug.cpp file, and then paste the following code in the Bug.cpp file.

    #using <mscorlib.dll>
#include <stdlib.h>
class AcGeVector3d
{
double x, y, z;
public:
__forceinline AcGeVector3d(const AcGeVector3d& src): x(src.x),y(src.y),z(src.z)
{
}
__forceinline AcGeVector3d(double xx, double yy, double zz) : x(xx),y(yy),z(zz)
{
}
__forceinline AcGeVector3d operator / (double val) const
{
return AcGeVector3d (x/val, y/val, z/val);
}
};
#define GETVECTOR3D(vec3d) (*reinterpret_cast<AcGeVector3d*>(&((vec3d).m_x)))
namespace Geometry
{
[System::Runtime::InteropServices::StructLayout(System::Runtime::InteropServices::LayoutKind::Sequential)]
public value class Vector3d
{
internal:
double m_x, m_y, m_z;
Vector3d(const AcGeVector3d* obj)
{
GETVECTOR3D(*this) = *obj;
}
public:
Vector3d(double x, double y, double z):m_x(x),m_y(y), m_z(z) {}
Vector3d DivideBy(double value)
{
return Vector3d(&GETVECTOR3D(*this).operator /(value));
}
virtual System::String^ ToString() override
{
return System::String::Format("{0}, {1}, {2}", m_x, m_y, m_z);
}
};
}

  3. To compile the Bug.cpp file, run the following command:
    cl /clr /GL /O2 bug.cpp /link /dll /out:bug.dll

  4. Create a new Microsoft Visual C# project to be used as the client project.

  5. Name the code file the Test.cs file, and then paste the following code in the Test.cs file.

    using Geometry;
namespace Test
{
class Tester
{
static void Main()
{
Vector3d v = new Vector3d(200, 200, 0);
v = v.DivideBy(150);
System.Console.WriteLine("{0}", v);
}
}
}

  6. To compile the Test.cs file, run the following command:
    csc /r:bug.dll test.cs

  7. To embed the manifest into the Test.exe file, run the following command:
    mt.exe -nologo -manifest bug.dll.manifest -outputresource:test.exe;1

  8. Run the Test.exe file.

Notice that the actual result is as follows:

1⁠.33333333333333, 1.333333333333, 0 However, the expected result is as follows:

1⁠.33333333333333, 0, 0

References

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates