[Bug tree-optimization/79981] Forwprop not working for __atomic_compare_exchange_n

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79981

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Mar 10 19:47:44 2017
New Revision: 246054

URL: https://gcc.gnu.org/viewcvs?rev=246054&root=gcc&view=rev
Log:
        PR tree-optimization/79981
        * tree-vrp.c (extract_range_basic): Handle IMAGPART_EXPR of
        ATOMIC_COMPARE_EXCHANGE ifn result.
        (stmt_interesting_for_vrp, vrp_visit_stmt): Handle
        IFN_ATOMIC_COMPARE_EXCHANGE.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-vrp.c