vector.md (vec_realign_load<mode>): Generate vperm directly to circumvent subtract...

vector.md (vec_realign_load<mode>): Generate vperm directly to circumvent subtract from splat{31} workaround.

2013-10-11  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	* config/rs6000/vector.md (vec_realign_load<mode>): Generate vperm
	directly to circumvent subtract from splat{31} workaround.
	* config/rs6000/rs6000-protos.h (altivec_expand_vec_perm_le): New
	prototype.
	* config/rs6000/rs6000.c (altivec_expand_vec_perm_le): New.
	* config/rs6000/altivec.md (define_c_enum "unspec"): Add
	UNSPEC_VPERM_X and UNSPEC_VPERM_UNS_X.
	(altivec_vperm_<mode>): Convert to define_insn_and_split to
	separate big and little endian logic.
	(*altivec_vperm_<mode>_internal): New define_insn.
	(altivec_vperm_<mode>_uns): Convert to define_insn_and_split to
	separate big and little endian logic.
	(*altivec_vperm_<mode>_uns_internal): New define_insn.
	(vec_permv16qi): Add little endian logic.

From-SVN: r203457