Incorrect results are returned by a Visual C++ 2008 SP1 application

Article translations Article translations
Close Close
Article ID: 981077 - View products that this article applies to.
Expand all | Collapse all

On This Page

SYMPTOMS

Consider the following scenario:
  • You use Microsoft Visual Studio 2008 Service Pack 1 (SP1) to create a Microsoft Visual C++ project.
  • You use the /arch:SSE compiler option to turn on Streaming SIMD Extensions (SSE) instructions. Or, you use the /arch:SSE2 compiler option to turn on SSE2 instructions.
  • A source file in the project calls the static_cast operator to convert float data types to int data types.
  • You build this project in Release mode. Then, an application is generated.
In this scenario, incorrect code is created, and then the application returns unexpected results.

CAUSE

This issue occurs because the compiler uses an incorrect register as a source to perform the conversion operation.

RESOLUTION

Hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, 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 2008 SP1 installed to apply this hotfix.

Restart requirement

You do not have to restart the computer after you apply the hotfix if no instance of Visual Studio is 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.
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
C2.dll15.0.30729.50222,283,84017-Apr-201011:46x86
C2.dll15.0.30729.50222,362,68817-Apr-201011:46x86
C2.dll15.0.30729.50223,018,04817-Apr-201011:46x64
Link.exe9.0.30729.50221,055,56017-Apr-201011:46x64
Link.exe9.0.30729.5022800,58417-Apr-201011:46x86

WORKAROUND

To work around this issue, use SSE intrinsics instead of the static_cast operator. The following sample code example shows how you can use the workaround:

The following is an example of the original code:
int xPos = static_cast<int> (mPoint.x);
The following is sample code that uses SSE intrinsics:
#ifdef WORKAROUND
#include <intrin.h>
#endif

#ifdef WORKAROUND
int xPos = _mm_cvttss_si32(_mm_load_ss(&mPoint.x));
#endif

STATUS

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

MORE INFORMATION

For more information about SSE intrinsics, visit the following Microsoft Developer Network (MSDN) Web site:
Streaming SIMD Extensions (SSE)

Properties

Article ID: 981077 - Last Review: October 9, 2011 - Revision: 2.0
APPLIES TO
  • Microsoft Visual Studio 2008 Service Pack 1
Keywords: 
kbHotfixServer kbexpertiseadvanced kbsurveynew kbqfe KB981077

Give Feedback

 

Contact us for more help

Contact us for more help
Connect with Answer Desk for expert help.
Get more support from smallbusiness.support.microsoft.com