[Bug target/110751] RISC-V: Suport undefined value that allows VSETVL PASS use TA/MA

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110751

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
OK, so TA is either merge or all-ones.  Not sure how you can use MA at the
moment since you specify an existing operand in your target hook.  As far as
I can see there's no value the target hook can provide that matches any
of the implementation semantics?