[Bug tree-optimization/88074] [7/8/9 Regression] g++ hangs on math expression

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88074

--- Comment #29 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Sat Feb 16 18:46:04 2019
New Revision: 268962

URL: https://gcc.gnu.org/viewcvs?rev=268962&root=gcc&view=rev
Log:
        PR middle-end/88074
        * simplify.c (simplify_transformation_to_array): Run post_op
        immediately after processing corresponding row, rather than at the
        end.
        (norm2_scale): New variable.
        (add_squared): Rename to ...
        (norm2_add_squared): ... this.  Scale down operand and/or result
        if needed.
        (do_sqrt): Rename to ...
        (norm2_do_sqrt): ... this.  Handle the result == e case.  Scale up
        result and clear norm2_scale.
        (gfc_simplify_norm2): Clear norm2_scale.  Change add_squared to
        norm2_add_squared and &do_sqrt to norm2_do_sqrt.  Scale up result
        and clear norm2_scale again.

Modified:
    trunk/gcc/fortran/ChangeLog
    trunk/gcc/fortran/simplify.c