[Bug target/95018] [10/11 Regression] Excessive unrolling for Fortran library array handling

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95018

--- Comment #39 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Jiu Fu Guo
<guojiufu@gcc.gnu.org>:

https://gcc.gnu.org/g:60bd3f20baebeeddd60f8a2b85927e7da7c6016e

commit r10-8327-g60bd3f20baebeeddd60f8a2b85927e7da7c6016e
Author: guojiufu <guojiufu@linux.ibm.com>
Date:   Thu May 28 13:42:23 2020 +0800

    Introduce flag_cunroll_grow_size for cunroll and avoid enable it at -O2

    Currently GIMPLE complete unroller(cunroll) is checking
    flag_unroll_loops and flag_peel_loops to see if allow size growth.
    Beside affects curnoll, flag_unroll_loops also controls RTL unroler.
    To have more freedom to control cunroll and RTL unroller, this patch
    introduces flag_cunroll_grow_size.  With this patch, we can control
    cunroll and RTL unroller indepently. And enable flag_cunroll_grow_size
    only if -funroll-loops or -fpeel-loops or -O3 is specified explicitly.

    gcc/ChangeLog
    2020-06-19  Jiufu Guo  <guojiufu@linux.ibm.com>

            PR target/95018
            * common.opt (flag_cunroll_grow_size): New flag.
            * toplev.c (process_options): Set flag_cunroll_grow_size.
            * tree-ssa-loop-ivcanon.c (pass_complete_unroll::execute):
            Use flag_cunroll_grow_size.
            * config/rs6000/rs6000.c (rs6000_option_override_internal):
            Override flag_cunroll_grow_size.