[Bug tree-optimization/90316] [8/9 Regression] large compile time increase in opt / alias stmt walking for Go example

rguenth at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Tue May 7 11:17:00 GMT 2019


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90316

--- Comment #16 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue May  7 11:17:00 2019
New Revision: 270940

URL: https://gcc.gnu.org/viewcvs?rev=270940&root=gcc&view=rev
Log:
2019-05-07  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/90316
        * tree-ssa-alias.h (get_continuation_for_phi): Take walking
        limit by reference.
        (walk_non_aliased_vuses): Take walking limit argument.
        * tree-ssa-alias.c (maybe_skip_until): Take limit and abort
        walking if it is reached instead of just counting.
        (get_continuation_for_phi): Likewise.
        (walk_non_aliased_vuses): Likewise, instead of leaving counter
        limiting to the callback.
        * tree-ssa-sccvn.c (vn_reference_lookup_2): Adjust.
        (vn_reference_lookup_3): Likewise.
        (vn_reference_lookup_pieces): Likewise.
        (vn_reference_lookup): Likewise.
        * tree-ssa-pre.c (translate_vuse_through_block): Limit walking.
        * tree-ssa-scopedtables.c (vuse_eq): Adjust.
        (avail_exprs_stack::lookup_avail_expr): Likewise.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-ssa-alias.c
    trunk/gcc/tree-ssa-alias.h
    trunk/gcc/tree-ssa-pre.c
    trunk/gcc/tree-ssa-sccvn.c
    trunk/gcc/tree-ssa-scopedtables.c


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