https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83262
--- Comment #12 from anlauf at gcc dot gnu.org ---
Changing the line
case (10)
to
case default
reduces the SELECT CASE by some amount. Maybe there is a slot allocated
for a CASE() outside 1..10 that could be eliminated if one determined that
key = mod(i,10) + 1
is in the range 1..10
