[Bug tree-optimization/38835] [4.3/4.4 Regression] field-insensitive PTA causes libstdc++ miscompiles

[rguenth at gcc dot gnu dot org]

------- Comment #12 from rguenth at gcc dot gnu dot org  2009-01-16 19:18 -------
Subject: Bug 38835

Author: rguenth
Date: Fri Jan 16 19:18:18 2009
New Revision: 143442

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=143442
Log:
2009-01-16  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/38835
        PR middle-end/36227
        * fold-const.c (fold_binary): Remove PTR + INT -> (INT)(PTR p+ INT)
        and INT + PTR -> (INT)(PTR p+ INT) folding.
        * tree-ssa-address.c (create_mem_ref): Properly use POINTER_PLUS_EXPR.

        java/
        * builtins.c (build_addr_sum): Use POINTER_PLUS_EXPR.

        * gcc.c-torture/execute/pr36227.c: New testcase.
        * gcc.dg/tree-ssa/foldaddr-1.c: XFAIL.
        * g++.dg/init/const7.C: Likewise.

Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/pr36227.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/java/ChangeLog
    trunk/gcc/java/builtins.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/g++.dg/init/const7.C
    trunk/gcc/testsuite/gcc.dg/tree-ssa/foldaddr-1.c
    trunk/gcc/tree-ssa-address.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38835