[Bug middle-end/43987] [4.5 Regression] type-punning causes broken binaries unless -O0 is used

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

------- Comment #22 from rguenth at gcc dot gnu dot org  2010-05-19 14:48 -------
Subject: Bug 43987

Author: rguenth
Date: Wed May 19 14:48:24 2010
New Revision: 159567

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=159567
Log:
2010-05-19  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/43987
        * tree-ssa-structalias.c (could_have_pointers): For possibly
        address-taken variables force pointers to be recorded.
        (create_variable_info_for_1): Likewise.
        (push_fields_onto_fieldstack): Pass in wheter all fields
        must have pointers.
        (find_func_aliases): Query types instead of vars whether
        they contain pointers where appropriate.

        * gcc.c-torture/execute/pr43987.c: New testcase.
        * gcc.dg/torture/pta-escape-1.c: Adjust.
        * gcc.dg/tree-ssa/pta-escape-1.c: Likewise.
        * gcc.dg/tree-ssa/pta-escape-2.c: Likewise.
        * gcc.dg/tree-ssa/pta-escape-3.c: Likewise.
        * gcc.dg/torture/ipa-pta-1.c: Likewise.

Added:
    branches/gcc-4_5-branch/gcc/testsuite/gcc.c-torture/execute/pr43987.c
Modified:
    branches/gcc-4_5-branch/gcc/ChangeLog
    branches/gcc-4_5-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_5-branch/gcc/testsuite/gcc.dg/torture/ipa-pta-1.c
    branches/gcc-4_5-branch/gcc/testsuite/gcc.dg/torture/pta-escape-1.c
    branches/gcc-4_5-branch/gcc/testsuite/gcc.dg/tree-ssa/pta-escape-1.c
    branches/gcc-4_5-branch/gcc/testsuite/gcc.dg/tree-ssa/pta-escape-2.c
    branches/gcc-4_5-branch/gcc/testsuite/gcc.dg/tree-ssa/pta-escape-3.c
    branches/gcc-4_5-branch/gcc/tree-ssa-structalias.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43987