[Bug debug/105158] ftree-ccp (CFG cleanup) drops DWARF const value attribute at -Og/-O1/-O2/-O3

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105158

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:1ba68f78c9d2510eb095f7d8a90c87cd5fd4183d

commit r13-99-g1ba68f78c9d2510eb095f7d8a90c87cd5fd4183d
Author: Richard Biener <rguenther@suse.de>
Date:   Tue Apr 5 15:23:54 2022 +0200

    debug/105158 - improve debug stmt retaining for forwarder removal

    Currently when we cannot move debug stmt from a forwarder to the
    destination block we drop/reset them.  But in some cases as for
    the testcase we can move them to the predecessor when that has
    a single successor and we can insert after the last stmt of the
    block.  That allows us to preserve debug info here.

    2022-04-05  Richard Biener  <rguenther@suse.de>

            PR debug/105158
            * tree-cfgcleanup.cc (move_debug_stmts_from_forwarder):
            Move debug stmts to the predecessor if moving to the
            destination is not possible.
            (remove_forwarder_block): Adjust.
            (remove_forwarder_block_with_phi): Likewise.