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Microsoft KB Archive/104891

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Knowledge Base


PSS ID Number: 104891

Article Last Modified on 3/24/2000



The information in this article applies to:

  • Microsoft FORTRAN PowerStation for MS-DOS 1.0



This article was previously published under Q104891

SYMPTOMS

A complex series of expressions may generate the Internal Compiler Error F1001 in file "@(#)fltreg.c:1.31" when compiled with full optimization (/Ox).

RESOLUTION

Adding the compiler switch /Op for floating-point consistency may avoid this error message. Removing the compiler switch /Ox may also resolve this problem. Breaking down the complex expressions using temporary variables is also a recommended solution.

STATUS

Microsoft has confirmed this to be a problem in FORTRAN PowerStation for MS-DOS, version 1.0. This problem has been resolved with FORTRAN powerstation maintenance release version 1.0a for MS-DOS.

FORTRAN PowerStation version 1.0 can be differentiated from maintenance release version 1.0a by invoking the linker. Typing Link32 | more from \F32\BIN directory will show version 2.8 for FORTRAN Powerstation version 1.0, and it will show version 1.0f for the maintenance release version 1.0a.

MORE INFORMATION

Some code compiled with the /Ox switch may generate the following error message:

fatal error F1001: INTERNAL COMPILER ERROR
compiler file '@(#)fltreg.c:1.31', line 4792

Depending on the contents of the file being compiled, the line could also be 2634.

To duplicate this error message, compile the following code with only the /Ox option. This sample produces the line 4792 message.

To resolve the problem, add the /Op option or remove the /Ox option. Also, almost any simplification or restructuring of the equations will remove the error. For example, uncomment the "temp =" line.

This code compiles without any error with Microsoft FORTRAN 5.1 or earlier.

Sample Code

C Compiler options required: /Ox and not /Op
      DIMENSION BN(30)
      COMMON ALPA, DN, THT, NP1, K, BN
c      temp = ALPA**((DN+1.0D0)*THT)
      SR=ALPA**(DN*THT)+BN(NP1)*0.5D0*ALPA**((DN+1.0D0)*THT)
      UTH=DSIN(THT)-BN(NP1)*0.5D0/ALPA**((DN+1.0D0)*THT)
      URB=ALPA**DCOS(DN*THT)*(DN-1.0D0)
      SRK2=(1.0D0)**ALPA**(K-1)
      UTHK2=(-1.0D0)**ALPA**K
      END
                


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Keywords: kbbug KB104891
Technology: kbAudDeveloper kbFORTRANPower100DOS kbFortranSearch kbZNotKeyword3