[Bug middle-end/49189] [4.7 regression] infinite recursion in constant folder

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49189

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2011.05.27 11:05:24
         AssignedTo|unassigned at gcc dot       |rguenth at gcc dot gnu.org
                   |gnu.org                     |
   Target Milestone|---                         |4.7.0
     Ever Confirmed|0                           |1

--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-05-27 11:05:24 UTC ---
Confirmed.  Endlessly visiting


Breakpoint 6, fold_unary_loc (loc=0, code=TRUTH_NOT_EXPR, type=0x7ffff5b7e5e8, 
    op0=0x7ffff5b820a0) at /space/rguenther/src/svn/trunk/gcc/fold-const.c:7555
7555      enum tree_code_class kind = TREE_CODE_CLASS (code);
(gdb) call debug_generic_expr (op0)
(const boolean) ((boolean) ((system__unsigned_types__short_unsigned) v->OBJECT
>> (integer) i) & 1)

Breakpoint 6, fold_unary_loc (loc=0, code=NOP_EXPR, type=0x7ffff5b7e5e8, 
    op0=0x7ffff5b83000) at /space/rguenther/src/svn/trunk/gcc/fold-const.c:7555
7555      enum tree_code_class kind = TREE_CODE_CLASS (code);
(gdb) call debug_generic_expr (op0)
((boolean) ((system__unsigned_types__short_unsigned) v->OBJECT >> (integer) i)
& 1) == 0
(gdb) call debug_generic_expr (type)
const boolean

Breakpoint 7, fold_binary_loc (loc=0, code=EQ_EXPR, type=0x7ffff5b7e5e8, 
    op0=0x7ffff5b72e70, op1=0x7ffff7ee85e0)
    at /space/rguenther/src/svn/trunk/gcc/fold-const.c:9280
9280      enum tree_code_class kind = TREE_CODE_CLASS (code);
(gdb) call debug_generic_expr (op0)
(boolean) ((system__unsigned_types__short_unsigned) v->OBJECT >> (integer) i) &
1
(gdb) call debug_generic_expr (op1)
0

Breakpoint 6, fold_unary_loc (loc=0, code=NOP_EXPR, type=0x7ffff5b7e5e8, 
    op0=0x7ffff5b72e70) at /space/rguenther/src/svn/trunk/gcc/fold-const.c:7555
7555      enum tree_code_class kind = TREE_CODE_CLASS (code);
(gdb) call debug_generic_expr (op0)
(boolean) ((system__unsigned_types__short_unsigned) v->OBJECT >> (integer) i) &
1
(gdb) call debug_generic_expr (type)
const boolean

Breakpoint 6, fold_unary_loc (loc=0, code=TRUTH_NOT_EXPR, type=0x7ffff5b7e5e8, 
    op0=0x7ffff5b820c8) at /space/rguenther/src/svn/trunk/gcc/fold-const.c:7555
7555      enum tree_code_class kind = TREE_CODE_CLASS (code);
...