Microsoft KB Archive/316090

= FIX: Fatal Error C1001 When You Compile a Program with Global Optimizer =

Article ID: 316090

Article Last Modified on 7/5/2005

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APPLIES TO


 * Microsoft Visual C++ .NET 2002 Standard Edition

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This article was previously published under Q316090



SYMPTOMS
When you compile a program with global optimizer, you receive the following error message:

&quot;fatal error C1001: INTERNAL COMPILER ERROR (compiler file 'f:\vs70builds\9466\vc\Compiler\Utc\src\P2\emit.c', line 937)

Please choose the Technical Support command on the Visual Help menu, or open the Technical Support help file for more information.&quot;



CAUSE
The behavior occurs because optimizer puts too many instructions in the function prolog for a particular optimization (frame pointer omission).



RESOLUTION
To work around the problem, you must prevent instructions from being scheduled in the prolog. To do this, do one of the following:
 * Make a function call to an external function that is contained in another object file (may not work when Whole program optimization (/GL) is enabled) or DLL.

-or-
 * Use the undocumented _ReadWriteBarrier intrinsic at the beginning of the affected function. This intrinsic does not generate any code but prevents optimizations across the intrinsic. To do this, add the following declaration to the file:

void _ReadWriteBarrier; Add the following code at the beginning of the function that causes the C1001 error: _ReadWriteBarrier; Note The use of undocumented intrinsics is not guaranteed to work in future versions of the compiler.
 * 1) pragma intrinsic(_ReadWriteBarrier)
 * 1) if _MSC_VER==1300
 * 1) endif



STATUS
Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article. This bug was corrected in Microsoft Visual C++ .NET (2003).

Additional query words: Og ICE KbCpp KbNative

Keywords: kbbug kbfix kbpending kbcompiler KB316090

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