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[Bug tree-optimization/79663] [7 Regression] r244815 causes 10% regression for spec1k/172.mgrid on AArch64


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79663

--- Comment #8 from amker at gcc dot gnu.org ---
Author: amker
Date: Tue Dec 19 15:25:56 2017
New Revision: 255828

URL: https://gcc.gnu.org/viewcvs?rev=255828&root=gcc&view=rev
Log:

        Backport from mainline
        2017-11-15  Bin Cheng  <bin.cheng@arm.com>

        PR tree-optimization/82726
        PR tree-optimization/70754
        * tree-predcom.c (order_drefs_by_pos): New function.
        (combine_chains): Move code setting has_max_use_after to...
        (try_combine_chains): ...here.  New parameter.  Sort combined chains
        according to position information.
        (tree_predictive_commoning_loop): Update call to above function.
        (update_pos_for_combined_chains, pcom_stmt_dominates_stmt_p): New.

        2017-11-15  Bin Cheng  <bin.cheng@arm.com>

        PR tree-optimization/82726
        Revert
        2017-01-23  Bin Cheng  <bin.cheng@arm.com>

        PR tree-optimization/70754
        * tree-predcom.c (stmt_combining_refs): New parameter INSERT_BEFORE.
        (reassociate_to_the_same_stmt): New parameter INSERT_BEFORE.  Insert
        combined stmt before it if not NULL.
        (combine_chains): Process refs reversely and compute dominance point
        for root ref.

        Revert
        2017-02-23  Bin Cheng  <bin.cheng@arm.com>

        PR tree-optimization/79663
        * tree-predcom.c (combine_chains): Process refs in reverse order
        only for ZERO length chains, and add explaining comment.

        gcc/testsuite

        Backport from mainline
        2017-11-15  Bin Cheng  <bin.cheng@arm.com>

        PR tree-optimization/82726
        * gcc.dg/tree-ssa/pr82726.c: New test.


Added:
    branches/gcc-7-branch/gcc/testsuite/gcc.dg/tree-ssa/pr82726.c
Modified:
    branches/gcc-7-branch/gcc/ChangeLog
    branches/gcc-7-branch/gcc/testsuite/ChangeLog
    branches/gcc-7-branch/gcc/tree-predcom.c

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