[Bug target/45198] Unnecessary spill slot for highpart extraction of xmm reg

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45198

--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Andrew Pinski from comment #3)
> (subreg:DI
> +         (match_operand:V4SF 1 "register_operand"
> +         "x,x") 0)
> 
> That is not a valid subreg and should have be rejected.

This change:

http://gcc.gnu.org/ml/gcc-patches/2013-12/msg00900.html

may allow

(subreg:DI (match_operand:V4SF 1 "register_operand" "x,x") 0)