[Bug tree-optimization/68583] [5/6 Regression] Missed if-conversion

["rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68583

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Dec  9 08:32:49 2015
New Revision: 231444

URL: https://gcc.gnu.org/viewcvs?rev=231444&root=gcc&view=rev
Log:
2015-12-09  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/68583
        * tree-if-conv.c (ifc_dr): Make flags bool, add w_unconditionally
        flag and rename predicates to w_predicate, rw_predicate and
        base_w_predicate.
        (DR_WRITTEN_AT_LEAST_ONCE): Rename to ...
        (DR_BASE_W_UNCONDITIONALLY): ... this.
        (DR_W_UNCONDITIONALLY): Add.
        (hash_memrefs_baserefs_and_store_DRs_read): Adjust.  Compute
        unconditionally written separately from read or written.
        (ifcvt_memrefs_wont_trap): Properly treat reads.
        (ifcvt_could_trap_p): Inline ...
        (if_convertible_gimple_assign_stmt_p): ... here.  Refactor
        to avoid code duplication.
        (if_convertible_loop_p_1): Adjust and properly initialize
        predicates.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-if-conv.c