https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67485
--- Comment #1 from Vittorio Zecca <zeccav at gmail dot com> --- Still in 6.1.0 at line 3162 of expmed.c "val_so_far -= (HOST_WIDE_INT) 1 << log;" ../../gcc-6.1.0/gcc/expmed.c:3162:42: runtime error: signed integer overflow: -9223372036854775808 - 1 cannot be represented in type 'long int'