[Bug rtl-optimization/63475] Postreload CSE propagates aliased memory operand

[uros at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63475

--- Comment #7 from uros at gcc dot gnu.org ---
Author: uros
Date: Wed Nov  5 12:02:17 2014
New Revision: 217119

URL: https://gcc.gnu.org/viewcvs?rev=217119&root=gcc&view=rev
Log:
    Backport from mainline:
    2014-10-20  Uros Bizjak  <ubizjak@gmail.com>

    * varasm.c (const_alias_set): Remove.
    (init_varasm_once): Remove initialization of const_alias_set.
    (build_constant_desc): Do not set alias set to const_alias_set.

    Backport from mainline:
    2014-10-14  Uros Bizjak  <ubizjak@gmail.com>

    PR rtl-optimization/63475
    * alias.c (true_dependence_1): Always use get_addr to extract
    true address operands from x_addr and mem_addr.  Use extracted
    address operands to check for references with alignment ANDs.
    Use extracted address operands with find_base_term and
    base_alias_check. For noncanonicalized operands call canon_rtx with
    extracted address operand.
    (write_dependence_1): Ditto.
    (may_alias_p): Ditto.  Remove unused calls to canon_rtx.

    Backport from mainline:
    2014-10-10  Uros Bizjak  <ubizjak@gmail.com>

    PR rtl-optimization/63483
    * alias.c (true_dependence_1): Do not exit early for MEM_READONLY_P
    references when alignment ANDs are involved.
    (write_dependence_p): Ditto.
    (may_alias_p): Ditto.


Modified:
    branches/gcc-4_9-branch/gcc/ChangeLog
    branches/gcc-4_9-branch/gcc/alias.c
    branches/gcc-4_9-branch/gcc/varasm.c