[Bug fortran/32393] gfortran - incorrect run time results

[dir at lanl dot gov]

------- Comment #14 from dir at lanl dot gov  2007-06-21 12:57 -------
>What is actually the expected result? Depending on the compiler and compiler
>setting, I get completely different results for the second triangular matrix.
>(The first matrix remains always the same.)

What the program does in this section is multiply the diagonal of the matrix by
2 with the line -

      tt=tt+tt

and so (0.8000E+01 -> 0.1600E+02), (0.1000E+02 -> 0.2000E+02) and (0.1300E+02
-> 0.2600E+02 ) and the other three elememts should stay the same. In debug
mode, most compilers will give the correct answer, but the addition is
sometimes being optmized away.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32393