Symptoms

Consider the following scenario:

  • You use Microsoft Macro Assembler (MASM) for x86 (ml.exe) or MASM for x64 (ml64.exe) to assemble an assembly language source file in Microsoft Visual Studio 2010 that contains the following code:

     vpsrld xmm0, xmm1, xmm2
    vpslld xmm0, xmm1, xmm2
  • You open the assembled code listing file (.lst), and then you check the outputs.

In this scenario, an incorrect opcode is generated for the vpsrld instruction. Specifically, the outputs of the vpsrld and vpslld instructions are the same.

Note The following is part of the listing file:

00000000 C5 F1 F2/ C2 vpsrld xmm0, xmm1, xmm2
00000004 C5 F1 F2/ C2 vpslld xmm0, xmm1, xmm2


Resolution

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 software update 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 website:

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

To apply this hotfix, you must have Visual Studio 2010 Service Pack 1 (SP1) installed.

Restart requirement

You do not have to restart the computer after you install the hotfix if the affected files are not being used during the installation. We recommend that you close all Visual Studio 2010-related components before you install the hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global 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 name

File version

File size

Date

Time

Platform

Ml.exe

10.0.40219.397

412,224

05-May-2012

13:51

x86

Ml64.exe

10.0.40219.397

364,096

05-May-2012

13:51

x86

Ml64.exe

10.0.40219.397

475,712

05-May-2012

13:51

x64

Status

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

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