[Bug tree-optimization/81578] [8 Regression] ICE in omp_reduction_init_op

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81578

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
#1  0x0000000000db5299 in omp_reduction_init_op (loc=2147483656, op=COND_EXPR, 
    type=<integer_type 0x7ffff68a95e8 int>)
    at /space/rguenther/src/svn/trunk/gcc/omp-low.c:3417
3417          gcc_unreachable ();
(gdb) l
3412              gcc_assert (INTEGRAL_TYPE_P (type));
3413              return TYPE_MAX_VALUE (type);
3414            }
3415
3416        default:
3417          gcc_unreachable ();

the thing to note is that autopar re-uses vectorizable_reduction but as that
gets enhanced you'll run into non-handled cases in autopar.

Need to untie those.

In this case cond reduction is not handled by autopar.

GCC 7 seems to work though.