[Bug tree-optimization/98213] [11 Regression] Never ending compilation at -O3 since r11-161-g283cb9ea6293e813

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98213

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rgue...@gcc.gnu.org>:

https://gcc.gnu.org/g:84d08255f9f2f7137caf648fcc9dc36101bc893c

commit r11-5886-g84d08255f9f2f7137caf648fcc9dc36101bc893c
Author: Richard Biener <rguent...@suse.de>
Date:   Wed Dec 9 15:48:36 2020 +0100

    tree-optimization/98213 - cache PHI walking result in SM

    This avoids exponential work when walking PHIs in loop store motion.
    Fails are quickly propagated and thus need no caching.

    2020-12-09  Richard Biener  <rguent...@suse.de>

            PR tree-optimization/98213
            * tree-ssa-loop-im.c (sm_seq_valid_bb): Cache successfully
            processed PHIs.
            (hoist_memory_references): Adjust.

            * g++.dg/pr98213.C: New testcase.