[Bug tree-optimization/55107] [4.7/4.8 Regression] GCC in an infinite loop in PRE

["pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55107

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
      Known to work|                            |4.4.5
           Keywords|                            |compile-time-hog
   Last reconfirmed|                            |2012-12-09
     Ever Confirmed|0                           |1
            Summary|GCC in an infinite loop at  |[4.7/4.8 Regression] GCC in
                   |-O2                         |an infinite loop in PRE
   Target Milestone|---                         |4.7.3
      Known to fail|                            |4.7.0, 4.8.0

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-12-09 02:55:54 UTC ---
#0  0x0000000000bd02db in bmp_iter_set (bi=0x7fffffffda90,
bit_no=0x7fffffffdab4) at /home/apinski/src/gcc-fsf/local//gcc/gcc/bitmap.h:532
#1  0x0000000000bd305f in bitmap_set_replace_value (set=0x1970858, lookfor=29,
expr=0x197d9a8) at /home/apinski/src/gcc-fsf/local//gcc/gcc/tree-ssa-pre.c:862
#2  0x0000000000bd30e6 in bitmap_value_replace_in_set (set=0x1970858,
expr=0x197d9a8) at /home/apinski/src/gcc-fsf/local//gcc/gcc/tree-ssa-pre.c:889
#3  0x0000000000bda1dd in insert_aux (block=0x7ffff70223a8) at
/home/apinski/src/gcc-fsf/local//gcc/gcc/tree-ssa-pre.c:3639
#4  0x0000000000bda294 in insert_aux (block=0x7ffff6fe6d00) at
/home/apinski/src/gcc-fsf/local//gcc/gcc/tree-ssa-pre.c:3654
#5  0x0000000000bda294 in insert_aux (block=0x7ffff6fe6bc8) at
/home/apinski/src/gcc-fsf/local//gcc/gcc/tree-ssa-pre.c:3654
#6  0x0000000000bda294 in insert_aux (block=0x7ffff6fe6820) at
/home/apinski/src/gcc-fsf/local//gcc/gcc/tree-ssa-pre.c:3654
#7  0x0000000000bda294 in insert_aux (block=0x7ffff6fe62d8) at
/home/apinski/src/gcc-fsf/local//gcc/gcc/tree-ssa-pre.c:3654
#8  0x0000000000bda294 in insert_aux (block=0x7ffff6fe6270) at
/home/apinski/src/gcc-fsf/local//gcc/gcc/tree-ssa-pre.c:3654
#9  0x0000000000bda294 in insert_aux (block=0x7ffff6fe61a0) at
/home/apinski/src/gcc-fsf/local//gcc/gcc/tree-ssa-pre.c:3654
#10 0x0000000000bda372 in insert () at
/home/apinski/src/gcc-fsf/local//gcc/gcc/tree-ssa-pre.c:3677
#11 0x0000000000bdd70f in do_pre () at
/home/apinski/src/gcc-fsf/local//gcc/gcc/tree-ssa-pre.c:4729

>Note that the stack trace looks the same as in PR55011.
That stack trace is just where xgcc is saying the cc1 was executed from.