[Bug target/118832] RISC-V: internal compiler error: could not split insn, with V+Zbb enabled

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118832

--- Comment #8 from Robin Dapp <rdapp at gcc dot gnu.org> ---
I think for vec_duplicate the idea is the same as for all the other splits -
keep it in simple shape so we can combine/fwprop etc.  It also helps converting
e.g.

  vmv.v.x v3,a3 vadd.vv v1, v2, v3

into

  vadd.vx vadd.vx v1, v2, a3