[Bug c++/83553] [6/7/8 Regression] compiler removes body of the for-loop, although there is a case label inside

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83553

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Sat Dec 23 08:40:19 2017
New Revision: 255987

URL: https://gcc.gnu.org/viewcvs?rev=255987&root=gcc&view=rev
Log:
        PR c++/83553
        * fold-const.c (struct contains_label_data): New type.
        (contains_label_1): Return non-NULL even for CASE_LABEL_EXPR, unless
        inside of a SWITCH_BODY seen during the walk.
        (contains_label_p): Use walk_tree instead of
        walk_tree_without_duplicates, prepare data for contains_label_1 and
        provide own pset.

        * c-c++-common/torture/pr83553.c: New test.

Added:
    trunk/gcc/testsuite/c-c++-common/torture/pr83553.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/testsuite/ChangeLog