[Bug tree-optimization/41186] VN doesn't look through non-aliasing by offset memcpy

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2009-08-30 11:52 -------
Subject: Bug 41186

Author: rguenth
Date: Sun Aug 30 11:52:13 2009
New Revision: 151226

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=151226
Log:
2009-08-30  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/41186
        * tree-ssa-alias.c (ptr_deref_may_alias_ref_p): Remove.
        (ao_ref_init_from_ptr_and_size): New function.
        (ref_maybe_used_by_call_p_1): Be more precise tracking
        used ranges for builtin functions.
        (ref_maybe_used_by_call_p): Adjust.
        (call_may_clobber_ref_p_1): Be more precise tracking clobbered
        ranges for builtin functions.
        * tree-ssa-alias.h (ao_ref_init_from_ptr_and_size): Declare.

        * g++.dg/torture/pr41186.C: New testcase.
        * g++.dg/tree-ssa/pr41186.C: Likewise.

Added:
    trunk/gcc/testsuite/g++.dg/torture/pr41186.C
    trunk/gcc/testsuite/g++.dg/tree-ssa/pr41186.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-alias.c
    trunk/gcc/tree-ssa-alias.h


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41186