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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/46130] New: [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

           Summary: [4.6 Regression] ICE: SIGSEGV in
                    walk_stmt_load_store_addr_ops (gimple.c:4894) with -O2
                    -fno-tree-dce
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz


Created attachment 22117
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22117
reduced testcase

Compiler output:
$ gcc -O2 -fno-tree-dce pr46130.c
pr46130.c: In function 'foo':
pr46130.c:15:1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Related valgrind output:
==22348== Invalid read of size 2
==22348==    at 0x6EA541: walk_stmt_load_store_addr_ops (gimple.c:4894)
==22348==    by 0xAAB87A: rebuild_cgraph_edges (cgraphbuild.c:471)
==22348==    by 0x796C5E: execute_one_pass (passes.c:1560)
==22348==    by 0x796EF4: execute_pass_list (passes.c:1615)
==22348==    by 0x79616B: do_per_function_toporder (passes.c:1153)
==22348==    by 0x7973A5: execute_ipa_pass_list (passes.c:1932)
==22348==    by 0xAB09D7: cgraph_optimize (cgraphunit.c:1696)
==22348==    by 0xAB0B99: cgraph_finalize_compilation_unit (cgraphunit.c:1016)
==22348==    by 0x4ABB8B: c_write_global_declarations (c-decl.c:9828)
==22348==    by 0x88A553: toplev_main (toplev.c:931)
==22348==    by 0x658ABBC: (below main) (in /lib64/libc-2.11.2.so)
==22348==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
==22348== 
testcase.c: In function 'foo':
testcase.c:15:1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.


Tested revisions:
r165822 - crash
r161659 - crash
r159696 - OK
4.5 r165781 - OK