More improvements to sparc VIS vec_init code generation.

More improvements to sparc VIS vec_init code generation.

gcc/

	* config/sparc/sparc.md (UNSPEC_SHORT_LOAD): New unspec.
	(zero-extend_v8qi_vis, zero_extend_v4hi_vis): New expanders.
	(*zero_extend_v8qi_<P:mode>_insn,
	*zero_extend_v4hi_<P:mode>_insn): New insns.
	* config/sparc/sparc.c (vector_init_move_words,
	vector_init_prepare_elts, sparc_expand_vector_init_vis2,
	sparc_expand_vector_init_vis1): New functions.
	(vector_init_bshuffle): Rewrite to handle more cases and make use
	of locs[] array prepared by vector_init_prepare_elts.
	(vector_init_fpmerge, vector_init_faligndata): Delete.
	(sparc_expand_vector_init): Rewrite using new infrastructure.

gcc/testsuite/

	* lib/test-supports.exp
	(check_effective_target_ultrasparc_vis2_hw): New proc.
	(check_effective_target_ultrasparc_vis3_hw): New proc.
	* gcc.target/sparc/vec-init-1.inc: New vector init common code.
	* gcc.target/sparc/vec-init-2.inc: Likewise.
	* gcc.target/sparc/vec-init-3.inc: Likewise.
	* gcc.target/sparc/vec-init-1-vis1.c: New test.
	* gcc.target/sparc/vec-init-1-vis2.c: New test.
	* gcc.target/sparc/vec-init-1-vis3.c: New test.
	* gcc.target/sparc/vec-init-2-vis1.c: New test.
	* gcc.target/sparc/vec-init-2-vis2.c: New test.
	* gcc.target/sparc/vec-init-2-vis3.c: New test.
	* gcc.target/sparc/vec-init-3-vis1.c: New test.
	* gcc.target/sparc/vec-init-3-vis2.c: New test.
	* gcc.target/sparc/vec-init-3-vis3.c: New test.

From-SVN: r181024