Microsoft KB Archive/918553

= FIX: A floating-point exception may occur when an inline function in a C++ application returns an uninitialized floating-point variable in Visual Studio 2005 =

Article ID: 918553

Article Last Modified on 8/28/2006

-

APPLIES TO


 * Microsoft Visual Studio 2005 Team System Architect Edition
 * Microsoft Visual Studio 2005 Team System Developer Edition
 * Microsoft Visual Studio 2005 Team System Test Edition
 * Microsoft Visual Studio 2005 Team Foundation
 * Microsoft Visual Studio 2005 Standard Edition
 * Microsoft Visual Studio 2005 Professional Edition
 * Microsoft Visual Studio 2005 Express Edition

-





SYMPTOMS
Consider the following scenario:
 * In Microsoft Visual Studio 2005, you create a C++ application.
 * You do not specify the /fp:except option. Therefore, floating-point exceptions are not enabled in the C++ application.
 * You do not specify the /fp:strict option. Therefore, the strict floating-point model is not enabled in the C++ application.
 * An inline function in the C++ application returns an uninitialized floating-point variable.
 * You compile the C++ application.

In this scenario, a floating-point exception may occur when you run the C++ application. Additionally, you may receive the following error message:

0xC0000090: Floating-point invalid operation.

Note This problem may occur in debug builds and in release builds.



CAUSE
This problem occurs when the uninitialized floating-point variable loads a memory location that contains a signaling not-a-number (NaN) value.



Hotfix information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it 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 Product Support Services to obtain the hotfix. For a complete list of Microsoft Product 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.

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, 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: kbbug kbfix kbqfe kbpubtypekc kbhotfixserver KB918553

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.