[Bug tree-optimization/80898] [8 Regression] wrong code at -O2 and -O3 in both 32-bit and 64-bit modes on x86_64-linux-gnu

[jamborm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80898

--- Comment #6 from Martin Jambor <jamborm at gcc dot gnu.org> ---
Author: jamborm
Date: Thu Jun  1 12:14:29 2017
New Revision: 248790

URL: https://gcc.gnu.org/viewcvs?rev=248790&root=gcc&view=rev
Log:
[PR 80898] Propagate grp_write from disqualified SRA candidates

2017-06-01  Martin Jambor  <mjam...@suse.cz>

        PR tree-optimization/80898
        * tree-sra.c (process_subtree_disqualification): Removed.
        (disqualify_candidate): Do not acll
        process_subtree_disqualification.
        (subtree_mark_written_and_enqueue): New function.
        (propagate_all_subaccesses): Set grp_write of LHS subtree if the
        RHS has been disqualified and re-queue LHS if necessary.  Apart
        from that, ignore disqualified RHS.

testsuite/
        * gcc.dg/tree-ssa/pr80898.c: New test.
        * gcc.dg/tree-ssa/pr80898-2.c: Likewise.


Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr80898-2.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr80898.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-sra.c