[Bug tree-optimization/46590] long compile time with -O2 and many loops

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46590

--- Comment #52 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Apr  1 11:36:25 2019
New Revision: 270055

URL: https://gcc.gnu.org/viewcvs?rev=270055&root=gcc&view=rev
Log:
2019-04-01  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/46590
        * domwalk.h (dom_walker::dom_walker): Consolidate constructors.
        (dom_walker::m_reachability): Add in place of...
        (dom_walker::m_skip_unreachable_blocks): ...this.
        * domwalk.c (dom_walker::dom_walker): Consoliate constructors.
        Move complex initialization ...
        (dom_walker::walk): Here.  Especially compute m_bb_to_rpo
        lazily and initialize edge flags on each invocation.
        (dom_walker::bb_reachable): Use m_reachability.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/domwalk.c
    trunk/gcc/domwalk.h