[Bug rtl-optimization/68991] -O3 generates misaligned xorv4si3

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68991

--- Comment #11 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Jakub Jelinek from comment #10)
> But why should the *mov<mode>_internal use Bm or vector_operand?  It
> can/should handle both aligned and unaligned memory operands.

Only for historical reason.