[Bug tree-optimization/46352] ICE: division by zero with -fdump-tree-tracer

["zsojka at seznam dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46352

--- Comment #1 from Zdenek Sojka <zsojka at seznam dot cz> 2010-12-20 14:12:19 UTC ---
Backtrace for r165699:

The offending line is:
    fprintf (dump_file, "Duplicated %i insns (%i%%)\n", nduplicated,
         nduplicated * 100 / ninsns);


Program received signal SIGFPE, Arithmetic exception.
0x000000000088a835 in tail_duplicate () at /mnt/svn/gcc-trunk/gcc/tracer.c:338
338         fprintf (dump_file, "Duplicated %i insns (%i%%)\n", nduplicated,
(gdb) bt
#0  0x000000000088a835 in tail_duplicate () at
/mnt/svn/gcc-trunk/gcc/tracer.c:338
#1  tracer () at /mnt/svn/gcc-trunk/gcc/tracer.c:364
#2  0x000000000079613f in execute_one_pass (pass=0x155f000) at
/mnt/svn/gcc-trunk/gcc/passes.c:1562
#3  0x00000000007963d5 in execute_pass_list (pass=0x155f000) at
/mnt/svn/gcc-trunk/gcc/passes.c:1617
#4  0x00000000007963e7 in execute_pass_list (pass=0x155fd80) at
/mnt/svn/gcc-trunk/gcc/passes.c:1618
#5  0x00000000008e30f6 in tree_rest_of_compilation (fndecl=0x7ffff5aadf00) at
/mnt/svn/gcc-trunk/gcc/tree-optimize.c:419
#6  0x0000000000aac342 in cgraph_expand_function (node=0x7ffff5acc000) at
/mnt/svn/gcc-trunk/gcc/cgraphunit.c:1494
#7  0x0000000000aae90a in cgraph_expand_all_functions () at
/mnt/svn/gcc-trunk/gcc/cgraphunit.c:1553
#8  cgraph_optimize () at /mnt/svn/gcc-trunk/gcc/cgraphunit.c:1809
#9  0x0000000000aaee6a in cgraph_finalize_compilation_unit () at
/mnt/svn/gcc-trunk/gcc/cgraphunit.c:1016
#10 0x00000000004ab4b4 in c_write_global_declarations () at
/mnt/svn/gcc-trunk/gcc/c-decl.c:9822
#11 0x0000000000889934 in compile_file (argc=16, argv=0x7fffffffdac8) at
/mnt/svn/gcc-trunk/gcc/toplev.c:931
#12 do_compile (argc=16, argv=0x7fffffffdac8) at
/mnt/svn/gcc-trunk/gcc/toplev.c:2363
#13 toplev_main (argc=16, argv=0x7fffffffdac8) at
/mnt/svn/gcc-trunk/gcc/toplev.c:2423
#14 0x00007ffff6371bbd in __libc_start_main () from /lib/libc.so.6
#15 0x00000000004920b9 in _start ()
(gdb) p nduplicated
$1 = 0
(gdb) p ninsns
$2 = <value optimized out>

I can't reproduce it in current trunk, but I don't know if it was fixed or just
hidden.