Split AVX vec_extract_lo_XXX and 128bit to 256bit cast.

Split AVX vec_extract_lo_XXX and 128bit to 256bit cast.
Remove 256bit to 128bit cast.

2010-06-23  H.J. Lu  <hongjiu.lu@intel.com>

	* config/i386/i386.c (bdesc_args): Replace CODE_FOR_avx_si_si256,
	CODE_FOR_avx_ps_ps256 and CODE_FOR_avx_pd_pd256 with
	CODE_FOR_vec_extract_lo_v8si, CODE_FOR_vec_extract_lo_v8sf
	and CODE_FOR_vec_extract_lo_v4df.

	* config/i386/sse.md (vec_extract_lo_<AVX256MODE4P:mode>):
	Changed to define_insn_and_split.
	(vec_extract_lo_<AVX256MODE8P:mode>): Likewise.
	(vec_extract_lo_v16hi): Likewise.
	(vec_extract_lo_v32qi): Likewise.
	(avx_<avxmodesuffixp><avxmodesuffix>_<avxmodesuffixp>): Likewise.
	(avx_<avxmodesuffixp>_<avxmodesuffixp><avxmodesuffix>): Removed.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@161279 138bc75d-0d04-0410-961f-82ee72b054a4