[Bug tree-optimization/71947] [6 Regression] x ^ y not folded to 0 if x == y by DOM

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71947

--- Comment #17 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Author: aldyh
Date: Wed Sep 13 17:20:19 2017
New Revision: 252532

URL: https://gcc.gnu.org/viewcvs?rev=252532&root=gcc&view=rev
Log:
        PR tree-optimization/81741
        PR tree-optimization/71947
        * tree-ssa-dom.c: Include tree-inline.h.
        (record_temporary_equivalences): Only record SSA_NAME = SSA_NAME
        equivalences if one is more expensive to compute than the other.
        * tree-ssa-scopedtables.h (class const_or_copies): Make
        record_const_or_copy_raw method private.
        (class avail_exprs_stack): New method simplify_binary_operation.
        * tree-ssa-scopedtables.c (avail_exprs_stack::lookup_avail_expr): Call
        avail_exprs_stack::simplify_binary_operation as needed.
        (avail_exprs_stack::simplify_binary_operation): New function.

        PR tree-optimization/81741
        PR tree-optimization/71947
        * gcc.dg/tree-ssa/pr81741.c: New test.
        * gcc.dg/tree-ssa/pr71947-7.c: New test.
        * gcc.dg/tree-ssa/pr71947-8.c: New test.
        * gcc.dg/tree-ssa/pr71947-9.c: New test.
        * gcc.dg/tree-ssa/pr71941-1.c: Tweak expected output.
        * gcc.dg/tree-ssa/pr71941-2.c: Tweak expected output.
        * gcc.dg/tree-ssa/pr71941-3.c: Tweak expected output.
        * gcc.dg/tree-ssa/20030922-2.c: xfail.

Added:
    branches/range-gen2/gcc/testsuite/gcc.dg/tree-ssa/pr71947-7.c
      - copied, changed from r252531,
branches/range-gen2/gcc/testsuite/gcc.dg/tree-ssa/pr71947-2.c
    branches/range-gen2/gcc/testsuite/gcc.dg/tree-ssa/pr71947-8.c
      - copied, changed from r252531,
branches/range-gen2/gcc/testsuite/gcc.dg/tree-ssa/pr71947-2.c
    branches/range-gen2/gcc/testsuite/gcc.dg/tree-ssa/pr71947-9.c
      - copied, changed from r252531,
branches/range-gen2/gcc/testsuite/gcc.dg/tree-ssa/pr71947-2.c
    branches/range-gen2/gcc/testsuite/gcc.dg/tree-ssa/pr81741.c
Modified:
    branches/range-gen2/gcc/ChangeLog
    branches/range-gen2/gcc/testsuite/ChangeLog
    branches/range-gen2/gcc/testsuite/gcc.dg/tree-ssa/20030922-2.c
    branches/range-gen2/gcc/testsuite/gcc.dg/tree-ssa/pr71947-1.c
    branches/range-gen2/gcc/testsuite/gcc.dg/tree-ssa/pr71947-2.c
    branches/range-gen2/gcc/testsuite/gcc.dg/tree-ssa/pr71947-3.c
    branches/range-gen2/gcc/tree-ssa-dom.c
    branches/range-gen2/gcc/tree-ssa-scopedtables.c
    branches/range-gen2/gcc/tree-ssa-scopedtables.h