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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/46130] [4.6 Regression] ICE: SIGSEGV in walk_stmt_load_store_addr_ops (gimple.c:4894) with -O2 -fno-tree-dce
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46130

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|rguenth at gcc dot gnu.org  |hubicka at gcc dot gnu.org

--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-02 12:49:59 UTC ---
First testcase:

Program received signal SIGSEGV, Segmentation fault.
0x000000000080e5fd in walk_stmt_load_store_addr_ops (stmt=0x7ffff5b47900, 
    data=0x7ffff5b01000, visit_load=0xd0293a <mark_load>, 
    visit_store=0xd02a5e <mark_store>, visit_addr=0xd027ca <mark_address>)
    at /space/rguenther/src/svn/trunk/gcc/gimple.c:5153
5153              if (TREE_CODE (op) == ADDR_EXPR)
(gdb) p op
$1 = (tree) 0x0
(gdb) call debug_gimple_stmt (stmt)
a_1 = PHI <0(2), (3)>

triggered by function splitting.  Re-assinging to Honza.