FIX: Optimization Problem, $STORAGE:2 and Multiplication

 Last reviewed: September 11, 1997
Article ID: Q73392
5.00 5.10 | 5.00 5.10 
MS-DOS    | OS/2
kbtool kbfixlist kbbuglist

The information in this article applies to:

  • Microsoft FORTRAN for MS-DOS, versions 5.0 and 5.1
  • Microsoft FORTRAN for OS/2, versions 5.0 and 5.1

SYMPTOMS

The sample code below produces the output: 

  6     0
instead of the expected output 

  6     1280

RESOLUTION

Use one of the following to work around the problem in the sample code:

  1. Disable optimization by compiling with /Od

    -or-

  2. Delete $storage:2 so that the default $storage:4 is used

    -or-

  3. Assign the result of (iy - 1) in line 10 to a temporary variable and use the temporary variable in line 20.

STATUS

Microsoft has confirmed this to be a bug in the products listed above. This problem was corrected in FORTRAN PowerStation, version 1.0.

MORE INFORMATION

The following sample code can be used to demonstrate the problem.

Sample code

$storage:2 

       call subs(6, 1)
       end

       subroutine subs(iy, ipage)
       integer bx, dx, tmp
10 bx = (ipage - 1) * 256 20 dx = (iy - 1) * 256 
       write (*, *) iy, dx
       return
       end

Additional reference words: 5.00 5.10 buglist5.00 buglist5.10 fixlist1.00
KBCategory: kbtool kbfixlist kbbuglist
KBSubCategory: FLIss
Solution Type : kbfix

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Last reviewed: September 11, 1997
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