https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67483
--- Comment #2 from Vittorio Zecca <zeccav at gmail dot com> --- Yes I confirm it is in trunk: ../../gcc7/gcc/combine.c:7727:40: runtime error: shift exponent -1 is negative combine.c:7727 is "& ((((unsigned HOST_WIDE_INT) 1 << count)) - 1)) == 0" count==-1 ?
