https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98236
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note f4 right now produces the best code even though it is not add/setN.
leal (%rdi,%rsi), %eax
shrl $31, %eax
is better overall because it does not touch the flags register and all
especially if there is other code around it.
For f2, the biggest thing here is a cost model around doing the expansion as
not/shift or cmp/set.
f5, f6 and f7 are now caught in GCC 11+.
