[Bug c++/70847] [6/7 Regression] exponential time in cp_fold for chained virtual function calls

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70847

--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Mon Jun  6 19:48:22 2016
New Revision: 237151

URL: https://gcc.gnu.org/viewcvs?rev=237151&root=gcc&view=rev
Log:
        PR c++/70847
        PR c++/71330
        PR c++/71393
        * cp-gimplify.c (cp_fold_r): Set *walk_subtrees = 0 and return NULL
        right after cp_fold call if cp_fold has returned the same stmt
        already in some earlier cp_fold_r call.
        (cp_fold_function): Add pset automatic variable, pass its address
        to cp_walk_tree.

        * g++.dg/opt/pr70847.C: New test.
        * g++.dg/ubsan/pr70847.C: New test.
        * g++.dg/ubsan/pr71393.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/opt/pr70847.C
    trunk/gcc/testsuite/g++.dg/ubsan/pr70847.C
    trunk/gcc/testsuite/g++.dg/ubsan/pr71393.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/cp-gimplify.c
    trunk/gcc/testsuite/ChangeLog