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From: "zsojka at seznam dot cz" <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

--- Comment #6 from Zdenek Sojka <zsojka at seznam dot cz> 2010-11-16 00:52:52 UTC ---
Created attachment 22414
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22414
another simple testcase

This one needs -flto too:

$ gcc -O2 -flto -fno-tree-dce testcase.c
==9353== Invalid read of size 2
==9353==    at 0x710735: walk_stmt_load_store_addr_ops (gimple.c:5024)
==9353==    by 0xAC5C12: rebuild_cgraph_edges (cgraphbuild.c:474)
==9353==    by 0x7BCA0E: execute_one_pass (passes.c:1560)
==9353==    by 0x7BCCD4: execute_pass_list (passes.c:1615)
==9353==    by 0x7BBEFB: do_per_function_toporder (passes.c:1153)
==9353==    by 0x7BD185: execute_ipa_pass_list (passes.c:1932)
==9353==    by 0xACAD67: cgraph_optimize (cgraphunit.c:1694)
==9353==    by 0xACAF29: cgraph_finalize_compilation_unit (cgraphunit.c:1015)
==9353==    by 0x4D7D8B: c_write_global_declarations (c-decl.c:9837)
==9353==    by 0x8A9405: toplev_main (toplev.c:885)
==9353==    by 0x6376BBC: (below main) (in /lib64/libc-2.11.2.so)
==9353==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
==9353== 
testcase.c: In function 'foo':
testcase.c:4:1: internal compiler error: Segmentation fault
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