[Bug middle-end/78566] [7 regression] gcc.dg/uninit-pred-6_[abc]*.c regressions on some non-x86 platforms

[aldyh at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78566

--- Comment #5 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Author: aldyh
Date: Tue Dec  6 10:33:41 2016
New Revision: 243288

URL: https://gcc.gnu.org/viewcvs?rev=243288&root=gcc&view=rev
Log:
        PR middle-end/78566
        * tree-ssa-uninit.c (can_one_predicate_be_invalidated_p): Change
        argument type to a pred_chain.
        (can_chain_union_be_invalidated_p): Use pred_chain instead of a
        worklist.
        (flatten_out_predicate_chains): Remove.
        (uninit_uses_cannot_happen): Rename from
        uninit_ops_invalidate_phi_use.
        Change logic so that we are checking that the PHI use will
        invalidate _ALL_ possibly uninitialized operands.
        (is_use_properly_guarded): Rename call to
        uninit_ops_invalidate_phi_use into uninit_uses_cannot_happen.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-ssa-uninit.c