https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80123
--- Comment #1 from acsawdey at gcc dot gnu.org ---
Changing the final constraint of vsx_splat_<mode> from "wr" to "b" allows this
to compile and pass the execution test.
This isn't really a correct fix as "b" is not NO_REGS if 64-bit instructions
are disabled.
;; V2DF/V2DI splat
(define_insn_and_split "vsx_splat_<mode>"
[(set (match_operand:VSX_D 0 "vsx_register_operand"
"=<VSa>, <VSa>,we,<VS_64dm>")
(vec_duplicate:VSX_D
(match_operand:<VS_scalar> 1 "splat_input_operand"
"<VS_64reg>,Z, b, wr")))]
