https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89213
--- Comment #6 from Segher Boessenkool <segher at gcc dot gnu.org> --- For 32-bit or smaller shifts you can use vspltisb always, or vspltis[hw] if you prefer. If generating code for ISA 2.07 (Power8) you don't have xxspltib but you do have vsld/vsrd/vsrad/vrld, hrm. You still can always generate the constant with just two insns of course (vspltis* and either a vsl* or a vrl* by 1, depending if you need the low bit 0 or 1, for example). But you cannot in general do it in one (non-load ;-) ) insn I think.
