[Bug target/79252] Improve code generation of vec_insert on PowerPC ISA 2.07 (i.e. power8)

[meissner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79252

--- Comment #1 from Michael Meissner <meissner at gcc dot gnu.org> ---
Created attachment 40594
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40594&action=edit
Test case to show the various vec_inserts

Compile this code with -O2 -mcpu=power8, and look at the various
v<type>_ins_<n>_arg functions to see the code generation.