[PATCH, i386]: Fix PR target/36992

[Richard Guenther]

On Sat, Aug 2, 2008 at 8:41 PM, Uros Bizjak <ubizjak@gmail.com> wrote:
> Hello!
>
> Attached patch fixes PR target/36992 by adding a SSE reg-reg alternative to
> vec_concatv2di insn patterns, following updated documentation from Intel.
> "movq xmm, xmm" insn fills upper 64bit with zeroes also for reg-reg moves.

"updated documentation"?  Are we sure all implementations follow this
updated documentation?  I guess a runtime testcase checking this would be
useful ;)

Thanks,
Richard.