You receive incorrect computation results when you use certain SuperH4 processor optimizations

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View products that this article applies to.

SYMPTOMS

When you use the following compiler options for the SuperH4 (SH4) processor, statements that cause 32-bit multiplication may produce incorrect results:

/Og: Enable global optimizations.
/Ot: Favor optimizations for speed over optimizations for size. This setting is a default setting.

You may also receive incorrect results when you use the following options that both include the /Og and /Ot optimizations:

/O2: Optimize code for maximum speed.
/Ox: Select full optimization; also known as maximum optimization.

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A supported software update is now available from Microsoft as Windows CE 4.2 Core OS QFE 830964. To resolve this problem immediately, click the following article number for information about obtaining Windows CE Platform Builder and core operating system software updates:

837392 (http://support.microsoft.com/kb/837392/ ) How to locate core operating system fixes for Microsoft Windows CE Platform Builder products

Prerequisites

This fix is supported only when all previously issued fixes for this product have also been installed.

Restart Requirement

You do not have to restart your computer after you apply this fix. After you apply this update, you must perform a clean operation and then rebuild the platform.

Hotfix Replacement Information

This fix does not replace any other fixes.

File Information

The English version of this package has the file attributes (or later) that are listed in the following table.

   Date         Time   Version      Size    File name
   -------------------------------------------------------------------------------
   25-Nov-2003  01:35  4.2.3.1124  977,464  Wincepb42-031124-kb830964-common.exe

The English version of this hotfix 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-Nov-2003  22:53  12.20.9773.0      901,120  C2_sh.dll

Note Because of file dependencies, the most recent fix that contains the previous files may also contain additional files.

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REFERENCES

For more information about optimization options, see the following MSDN Web site:

eMbedded Visual C++ Guide: /O options (Optimize Code)
http://msdn2.microsoft.com/en-us/library/aa259590(SQL.80).aspx (http://msdn2.microsoft.com/en-us/library/aa259590(SQL.80).aspx)

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APPLIES TO

Microsoft Windows CE .NET 4.2

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kbbug kbfix kbqfe KB830964

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Retired KB Content Disclaimer

This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.

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