"Maximize speed" creates incorrect code by ghazel

Hi, thanks for the bug report. This is a compiler optimizer bug that is fixed in VS11 (it was fixed in the Beta release).

If you need a workaround for the VS 2010 compiler, you can turn off optimizations for the one specific function via:

#pragma optimize("", off)
... your_func() {
...
}
#pragma optimize("", on)

If you feel you would like a hotfix for VS 2010, please visit the support site:

http://support.microsoft.com/common/international.aspx?RDPATH=dm;en-us;selectassist&target=assistance

Thanks,
Eric Brumer
Microsoft Visual C++

Reduced test project: test740487.zip

Thanks for your feedback. Your issue has been routed to the appropriate VS development team for investigation. We will contact you if we require any additional information.

Thank you for your feedback, we are currently reviewing the issue you have submitted. If this issue is urgent, please contact support directly(http://support.microsoft.com)

The problem seems to occur around the check for the type of operation:


    if((request->operation & 0xFF) == 1) {
00E911B3 cmp         word ptr [esi],1
00E911B7 jne         do_scheduled_stream+0A5h (0E911C5h)

Comparing the word ptr esi to 1 is not the same as comparing the two masked bytes to 1.