[Bug tree-optimization/70614] GCC gets stuck with -O

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70614

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-04-10
                 CC|                            |trippels at gcc dot gnu.org
          Component|c                           |tree-optimization
     Ever confirmed|0                           |1
      Known to fail|                            |4.9.3, 5.3.0, 6.0

--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Looping in tree-scalar-evolution:

#0  chrec_contains_symbols_defined_in_loop (chrec=0x7ffff6ba7948, loop_nb=1) at
../../gcc/gcc/tree-scalar-evolution.c:402
#1  0x0000000000c02843 in no_evolution_in_loop_p (res=<synthetic pointer>,
loop_num=1, chrec=0x7ffff6ba7948) at ../../gcc/gcc/tree-chrec.h:118
#2  compute_scalar_evolution_in_loop (wrto_loop=0x7ffff728ad20,
def_loop=<optimized out>, ev=<optimized out>) at
../../gcc/gcc/tree-scalar-evolution.c:2002
#3  0x0000000000bfcbb5 in analyze_scalar_evolution_1 (loop=0x7ffff728ad20,
var=0x7ffff6b64bd0, res=0x0) at ../../gcc/gcc/tree-scalar-evolution.c:2048
#4  0x0000000000bfd778 in analyze_scalar_evolution
(loop=loop@entry=0x7ffff728ad20, var=0x7ffff6b64bd0) at
../../gcc/gcc/tree-scalar-evolution.c:2111
#5  0x0000000000bfcd34 in interpret_condition_phi (condition_phi=<optimized
out>, loop=0x7ffff728ad20) at ../../gcc/gcc/tree-scalar-evolution.c:1687
#6  analyze_scalar_evolution_1 (loop=0x7ffff728ad20, var=0x7ffff6ba3828,
res=<optimized out>) at ../../gcc/gcc/tree-scalar-evolution.c:2063
#7  0x0000000000bfcbb5 in analyze_scalar_evolution_1 (loop=0x7ffff728ad20,
var=0x7ffff6b64ca8, res=0x0) at ../../gcc/gcc/tree-scalar-evolution.c:2048
#8  0x0000000000bfd778 in analyze_scalar_evolution
(loop=loop@entry=0x7ffff728ad20, var=0x7ffff6b64ca8) at
../../gcc/gcc/tree-scalar-evolution.c:2111
#9  0x0000000000bfcd34 in interpret_condition_phi (condition_phi=<optimized
out>, loop=0x7ffff728ad20) at ../../gcc/gcc/tree-scalar-evolution.c:1687
#10 analyze_scalar_evolution_1 (loop=0x7ffff728ad20, var=0x7ffff6b9b678,
res=<optimized out>) at ../../gcc/gcc/tree-scalar-evolution.c:2063
...