FIX: Turning on Optimization Generates Incorrect Code

This article has been archived. It is offered "as is" and will no longer be updated.
Turning on /Og, /O1, or /O2 optimizations may generate incorrect code. The Generate Assembly instruction incorrectly loads the AL register value instead of the AH register value. As a result, you may receive incorrect output from your application.
A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone 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.

The English version of this fix has the file attributes (or later) 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 tool in Control Panel.
   Date         Time   Version             Size   File name   --------------------------------------------------------------   13-Jun-2003  21:11  13.0.9709.0     2,105,344  C1xx.dll   13-Jun-2003  21:11  13.0.9709.0     1,753,088  C2.dll				

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

Article ID: 822677 - Last Review: 10/26/2013 18:59:22 - Revision: 1.2

  • Microsoft Visual C++ .NET 2002 Standard Edition
  • kbnosurvey kbarchive kbbug kbfix kbqfe kbhotfixserver KB822677