https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69720
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
vect_finalize_reduction:
...
/* 2.5 Adjust the final result by the initial value of the reduction
variable. (When such adjustment is not needed, then
'adjustment_def' is zero). For example, if code is PLUS we create:
new_temp = loop_exit_def + adjustment_def */
if (adjustment_def)
{
gcc_assert (!slp_reduc);
misses support for ncopies > 1.
Bah, stupid spaghetti in this function.
