[Bug middle-end/35593] [4.3 Regression] spurious warning "array subscript is below array bounds" with void* function argument plus -O2

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2008-03-15 14:28 -------
Subject: Bug 35593

Author: rguenth
Date: Sat Mar 15 14:27:55 2008
New Revision: 133249

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=133249
Log:
2008-03-15  Richard Guenther  <[EMAIL PROTECTED]>

        PR middle-end/35593
        * tree-ssa-ccp.c (maybe_fold_offset_to_array_ref): Make sure
        to not produce negative array indices if not allowed.  Add
        parameter to indicate that.
        (maybe_fold_offset_to_component_ref): Allow negative array
        indices only for the first member of a structure.
        (maybe_fold_offset_to_reference): Allow negative array indices.
        (maybe_fold_stmt_addition): Likewise.

        * g++.dg/warn/Warray-bounds-3.C: New testcase.

Added:
    trunk/gcc/testsuite/g++.dg/warn/Warray-bounds-3.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-ccp.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35593