[Bug tree-optimization/83362] [8 Regression] wrong code at -O1

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83362

--- Comment #4 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Tue Dec 12 22:46:46 2017
New Revision: 255593

URL: https://gcc.gnu.org/viewcvs?rev=255593&root=gcc&view=rev
Log:
        PR tree-optimization/83298
        PR tree-optimization/83362
        PR tree-optimization/83383
        * gimple-ssa-evrp-analyze.h (class evrp_range_analyzer): Make
        push_value_range a public interface.  Add new argument to
        record_ranges_from_stmt.
        * gimple-ssa-evrp-analyze.c
        (evrp_range_analyzer::record_ranges_from_stmt): Add new argument.
        Update comments.  Handle recording temporary equivalences.
        * tree-ssa-dom.c (dom_opt_opt_walker::before_dom_children): Add
        new argument to call to evrp_range_analyzer::record_ranges_from_stmt.
        * gimple-ssa-evrp.c (evrp_dom_walker::before_dom_children): Likewise.
        * tree-ssa-threadedge.c: Include alloc-pool.h, vr-values.h and
        gimple-ssa-evrp-analyze.h.
        (record_temporary_equivalences_from_phis): Add new argument.  When
        the PHI arg is an SSA_NAME, set the result's range to the range
        of the PHI arg.
        (record_temporary_equivalences_from_stmts_at_dest): Record ranges
        from statements too.
        (thread_through_normal_block): Accept new argument,
evrp_range_analyzer.
        Pass it down to children as needed.
        (thread_outgoing_edges): Likewise.
        (thread_across_edge): Likewise.   Push/pop range state as needed.
        * tree-ssa-threadedge.h (thread_outgoing_edges): Update prototype.

        PR tree-optimization/83298
        PR tree-optimization/83362
        PR tree-optimization/83383
        * gcc.c-torture/execute/pr83298.c: New test.
        * gcc.c-torture/execute/pr83362.c New test.
        * gcc.c-torture/execute/pr83383.c New test.

Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/pr83298.c
    trunk/gcc/testsuite/gcc.c-torture/execute/pr83362.c
    trunk/gcc/testsuite/gcc.c-torture/execute/pr83383.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/gimple-ssa-evrp-analyze.c
    trunk/gcc/gimple-ssa-evrp-analyze.h
    trunk/gcc/gimple-ssa-evrp.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-dom.c
    trunk/gcc/tree-ssa-threadedge.c
    trunk/gcc/tree-ssa-threadedge.h
    trunk/gcc/tree-vrp.c