[Bug tree-optimization/47679] [4.8/4.9/5/6 Regression] Strange uninitialized warning after SRA

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47679

--- Comment #19 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Fri Apr 17 19:24:17 2015
New Revision: 222195

URL: https://gcc.gnu.org/viewcvs?rev=222195&root=gcc&view=rev
Log:
    PR tree-optimization/47679
    * Makefile.in (OBJS); Add tree-ssa-scopedtables.o.
    * tree-ssa-scopedtables.c: New file.
    * tree-ssa-scopedtables.h: New file.
    * tree-ssa-dom.c: Include tree-ssa-scopedtables.h.
    (const_and_copies): Change name/type.
    (record_const_or_copy): Move into tree-ssa-scopedtables.c
    (record_const_or_copy_1): Similarly.
    (restore_vars_to_original_value): Similarly.
    (pass_dominator::execute): Create and destroy const_and_copies table.
    (thread_across_edge): Update passing of const_and_copies.
    (record_temporary_equivalence): Use method calls rather than
    manipulating const_and_copies directly.
    (record_equality, cprop_into_successor_phis): Similarly.
    (dom_opt_dom_walker::before_dom_children): Similarly.
    (dom_opt_dom_walker::after_dom_children): Similarly.
    (eliminate_redundant_computations): Similarly.
    * tree-ssa-threadedge.c (remove_temporary_equivalences): Delete.
    (record_temporary_equivalence): Likewise.
    (invalidate_equivalences): Likewise.
    (record_temporary_equivalences_from_phis): Update due to type
    change of const_and_copies.  Use method calls rather than
    manipulating the stack directly.
    (record_temporary_equivalences_from_stmts_at_dest): Likewise.
    (thread_through_normal_block, thread_across_edge): Likewise.
    (thread_across_edge): Likewise.
    * tree-ssa-threadedge.h (thread_across_edge): Update prototype.
    * tree-vrp.c: Include tree-ssa-scopedtables.h.  Change type
    of equiv_stack.
    (identify_jump_threads): Update due to type change of equiv_stack.
    (finalize_jump_threads): Delete the equiv_stack when complete.

Added:
    trunk/gcc/tree-ssa-scopedtables.c
    trunk/gcc/tree-ssa-scopedtables.h
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/Makefile.in
    trunk/gcc/tree-ssa-dom.c
    trunk/gcc/tree-ssa-loop-ch.c
    trunk/gcc/tree-ssa-threadedge.c
    trunk/gcc/tree-ssa-threadedge.h
    trunk/gcc/tree-vrp.c