Microsoft KB Archive/168011

= FIX: C1001, file 'fppeeps.c', line 394, Caused By /Og =

Article ID: 168011

Article Last Modified on 7/5/2005

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APPLIES TO


 * Microsoft Visual C++ 5.0 Enterprise Edition
 * Microsoft Visual C++ 5.0 Professional Edition

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This article was previously published under Q168011



SYMPTOMS
Compiling the sample code below may cause the following error:

  ttt.cpp(10) : fatal error C1001: INTERNAL COMPILER ERROR (compiler file 'E:\utc\src\\P2\x86\fppeeps.c', line 394)



CAUSE
This internal compiler error is caused by global optimizations which is enabled by the /Og option. The /O1 (minimize space), /O2 (maximize speed), and /Ox (maximum opts.) options include the /Og switch so those may also cause this C1001 error.



RESOLUTION
Enabling the /Op (improve floating-pt consistency) optimization, or disabling the /Og optimization, either at the command line or by use of #pragma optimize will avoid the C1001 error. A more intrusive workaround would be to change the floats to doubles.



STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been corrected in Visual Studio 97 Service Pack 1.

For additional information about the Visual Studio 97 Service Pack 1, please see the following article in the Microsoft Knowledge Base:

170365 INFO: Visual Studio 97 Service Packs - What, Where, and Why



MORE INFORMATION
The following code demonstrates one form of this C1001 error. Use /Og- or /Ogp as a workaround.

SAMPLE CODE
// cl /c /Og float gf1, gf2, gf3; float func( float *pf2, float f, float f1, float f2, float f3 ) {      f3 = f * (*pf2); gf3 = f3; gf2 = f2; gf1 = f1; return f;  }

Keywords: kbbug kbfix kbvs97sp1fix kbvs97sp2fix KB168011

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