[Bug fortran/121185] [16 Regression] regression on elemental operation of division

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121185

--- Comment #46 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Mikael Morin <mikael@gcc.gnu.org>:

https://gcc.gnu.org/g:1c795ee4bc6b08f16cf1ad43acac47dc7c4b6b94

commit r16-8359-g1c795ee4bc6b08f16cf1ad43acac47dc7c4b6b94
Author: Mikael Morin <mikael@gcc.gnu.org>
Date:   Tue Mar 31 15:34:29 2026 +0200

    fortran: Give up reference factoring in case of shared tree [PR124661]

    When we are about to create a variable to factor a subreference of an
    array descriptor, check whether that subreference is shared with some of
    the preliminary code and abort the factoring in that case.

    In the example from the PR, the preliminary code contained bounds
    checking code and the replacement of the subreferences by fresh
    variables was causing those variables to be used before they were
    defined in that bounds checking code.

            PR fortran/121185
            PR fortran/124661

    gcc/fortran/ChangeLog:

            * trans-array.cc (maybe_save_ref): New wrapper function around
            save ref.
            (set_factored_descriptor_value): Use the new wrapper function.
            Add argument PRELIMINARY_CODE.
            (gfc_conv_ss_descriptor): Update caller.

    gcc/ChangeLog:

            * tree-inline.cc (debug_find_tree, debug_find_tree_1): Move
            and rename functions...
            * tree.cc (find_tree, find_tree_1): ... here.
            * tree-inline.h (debug_find_tree): Move renamed declaration...
            * tree.h (find_tree): ... here.

    gcc/testsuite/ChangeLog:

            * gfortran.dg/bounds_check_28.f90: New test.

    Co-authored-by: Christopher Albert <albert@tugraz.at>