Microsoft KB Archive/114075

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FIX: M6110 Error When Using 'switch' Statement with /Oe

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Q114075

7.00 | 1.00 MS-DOS | WINDOWS kbtool kbfixlist kbbuglist -- The information in this article applies to: - The Microsoft C/C++ Compiler (CL.EXE), included with: - Microsoft C/C++ for MS-DOS, version 7.0 - Microsoft Visual C++ for Windows, versions 1.0 -- SYMPTOMS ======== In certain cases the C/C++ compiler will generate incorrect code when the /Oe (Enable Global Register Allocation) optimization is used on source code which does floating point calculations before a switch statement. The compiler does not correctly generate code to clear the floating point stack after the floating point calculations have been performed. This causes a floating point stack overflow when the calculations are done repeatedly. When the program is run it will fail and display the following error message: run-time error M6110: MATH - floating-point error: stack overflow The problem can be reproduced by building and running the sample code shown below. RESOLUTION ========== To work around the problem, use the #pragma optimize directive to disable /Oe for the function where the M6110 error occurs. This is indicated in the sample code below. Alternatively, the module containing the function could be compiled without the /Oe option. STATUS ====== Microsoft has confirmed this to be a problem in the Microsoft products listed above. This problem was corrected in Visual C++ version 1.5. Sample Code --- /* Compile options needed: /Oe (or /O2, or /Ox, both include /Oe) */ #include /* uncomment the #pragmas to correct the problem #pragma optimize( "e", off ) */ int main { int count; float flt1, flt2; for ( count = 1; count <= 50; count++ ) { flt1 = 1.5F * count; flt2 = 2.0F * count; switch ( count ) { default: printf( "In loop...\n" ); } } printf( "Test was successful!\n" ); return (int)( flt1 + flt2 ); } /* #pragma optimize( "e", on ) */ Additional reference words: 7.00 8.00 1.00 KBCategory: kbtool kbfixlist kbbuglist KBSubcategory: CLIss

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