FIX: A floating-point exception occurs when an application contains an uninitialized floating-point variable and is compiled with the /fp:expect option in Visual Studio 2008

When you run a C++ application that contains an uninitialized floating-point variable in Microsoft Visual Studio 2008, a floating-point exception occurs. Additionally, you may receive the following error message:
0xC0000090: Floating-point invalid operation
This problem occurs if the following conditions are true:
  • You add the /fp:except option to the compiler option list to disable the floating-point exception.
  • The source code contains an uninitialized floating-point variable.
  • The uninitialized floating-point variable is located in a memory that contains a signaling not-a-number (NaN) value.
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 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: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.


You must have Visual Studio 2008 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.
File nameFile versionFile sizeDateTimePlatform
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the /fp compiler options, visit the following Microsoft Web site:

Article ID: 956089 - Last Review: 09/17/2008 21:58:01 - Revision: 1.0

Microsoft Visual Studio 2008 Professional Edition, Microsoft Visual Studio 2008 Standard Edition, Microsoft Visual Studio Team System 2008 Database Edition, Microsoft Visual Studio Team System 2008 Architecture Edition, Microsoft Visual Studio Team System 2008 Development Edition, Microsoft Visual Studio Team System 2008 Test Edition, Microsoft Visual Studio Team System 2008 Team Foundation Server, Microsoft Visual Studio Team System 2008 Team Suite, Microsoft Visual Studio Team System 2008 Test Load Agent, Microsoft Visual Studio 2008 Tools for Applications Software Development Kit

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