[Bug ipa/65270] [5 regression] issues with merging memory accesses from different code paths

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65270

--- Comment #33 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Mar  9 13:54:28 2015
New Revision: 221281

URL: https://gcc.gnu.org/viewcvs?rev=221281&root=gcc&view=rev
Log:
2015-03-09  Richard Biener  <rguenther@suse.de>

    PR middle-end/65270
    * tree-core.h (enum operand_equal_flag): Add OEP_ADDRESS_OF.
    * fold-const.c (operand_equal_p): When recursing for ADDR_EXPRs
    operand set OEP_ADDRESS_OF.  Clear it when recursing to non-bases
    of that.  When comparing dereferences compare alignment.
    When comparing MEM_REFs or TARGET_MEM_REFs compare dependence info.

    * gcc.dg/torture/pr65270-1.c: New testcase.
    * gcc.dg/torture/pr65270-2.c: Likewise. 

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr65270-1.c
    trunk/gcc/testsuite/gcc.dg/torture/pr65270-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-core.h