[Bug rtl-optimization/83496] [7/8 regression] wrong code generated with -Os -mbranch-cost=1

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83496

--- Comment #35 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Author: ebotcazou
Date: Mon Feb 26 16:39:41 2018
New Revision: 258000

URL: https://gcc.gnu.org/viewcvs?rev=258000&root=gcc&view=rev
Log:
        PR rtl-optimization/83496
        * reorg.c (steal_delay_list_from_target): Change REDUNDANT array from
        booleans to RTXes.  Call fix_reg_dead_note on every non-null element.
        (steal_delay_list_from_fallthrough): Call fix_reg_dead_note on a
        redundant insn, if any.
        (relax_delay_slots): Likewise.
        (update_reg_unused_notes): Rename REDUNDANT_INSN to OTHER_INSN.

Added:
    branches/gcc-7-branch/gcc/testsuite/gcc.c-torture/execute/20180226-1.c
      - copied unchanged from r257998,
trunk/gcc/testsuite/gcc.c-torture/execute/20180226-1.c
Modified:
    branches/gcc-7-branch/gcc/ChangeLog
    branches/gcc-7-branch/gcc/reorg.c
    branches/gcc-7-branch/gcc/testsuite/ChangeLog