[Bug tree-optimization/71881] [4.9/6/7 Regression] ICE on valid code at -O3 with -g enabled on x86_64-linux-gnu: cannot update SSA form

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71881

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-valid-code
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-07-14
                 CC|                            |marxin at gcc dot gnu.org
            Summary|ICE on valid code at -O3    |[4.9/6/7 Regression] ICE on
                   |with -g enabled on          |valid code at -O3 with -g
                   |x86_64-linux-gnu: cannot    |enabled on
                   |update SSA form             |x86_64-linux-gnu: cannot
                   |                            |update SSA form
     Ever confirmed|0                           |1

--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, GCC 5 branch looks fine, however 4.9 doesn't:

pr71881.c:4:5: internal compiler error: Segmentation fault
 int fn1 ()
     ^
0x9ad80f crash_signal
        /home/marxin/BIG/Programming/gcc/gcc/toplev.c:337
0xb4d7a3 verify_use
        /home/marxin/BIG/Programming/gcc/gcc/tree-ssa.c:803
0xb52357 verify_ssa(bool)
        /home/marxin/BIG/Programming/gcc/gcc/tree-ssa.c:1058
0x900a0c execute_function_todo
        /home/marxin/BIG/Programming/gcc/gcc/passes.c:1854
0x9012c4 do_per_function
        /home/marxin/BIG/Programming/gcc/gcc/passes.c:1574
0x9012c4 execute_todo
        /home/marxin/BIG/Programming/gcc/gcc/passes.c:1887