Microsoft KB Archive/945567

= FIX: The code optimizer of the native 64-bit version of the Visual C++ 2005 compiler may generate incorrect code =

Article ID: 945567

Article Last Modified on 12/26/2007

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APPLIES TO


 * Microsoft Visual Studio 2005 Express Edition
 * Microsoft Visual Studio 2005 Professional Edition
 * Microsoft Visual Studio 2005 Standard Edition

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SYMPTOMS
The code optimizer of the native 64-bit version of the Microsoft Visual C++ 2005 compiler may generate incorrect code. This problem occurs when you use one of the following compiler options to compile a Visual C++ 2005 application:
 * Favor Fast Code (/Ot)
 * Favor Small Code (/Os)



CAUSE
This problem occurs because the code optimizer tries to use an instruction that does not exist. At runtime, the instruction is interpreted by the processor differently.



Hotfix information
A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Visual Studio 2005 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites
You must have Visual Studio 2005 Service Pack 1 installed to apply this hotfix.

Restart requirement
You do not have to restart the computer after you apply this hotfix.

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.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For more information about the /Os compiler option and the /Ot compiler option, visit the following Microsoft Web site:

http://msdn2.microsoft.com/en-us/library/f9534wye(VS.80).aspx

To see the complete list of Visual C++ 2005 compiler options, visit the following Microsoft Web site:

http://msdn2.microsoft.com/en-us/library/9s7c9wdw(VS.80).aspx

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

Keywords: kbfix kbexpertiseadvanced kbpubtypekc kbqfe kbhotfixserver KB945567

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