sse.md (reduc_umin_v8hi): New pattern.

sse.md (reduc_umin_v8hi): New pattern.

	* config/i386/sse.md (reduc_umin_v8hi): New pattern.
	* config/i386/i386.c (ix86_build_const_vector): Handle
	also V32QI, V16QI, V16HI and V8HI modes.
	(emit_reduc_half): New function.
	(ix86_expand_reduc): Use phminposuw insn for V8HImode UMIN.
	Use emit_reduc_half helper function.

	* gcc.target/i386/sse4_1-phminposuw-2.c: New test.
	* gcc.target/i386/sse4_1-phminposuw-3.c: New test.
	* gcc.target/i386/avx-vphminposuw-2.c: New test.
	* gcc.target/i386/avx-vphminposuw-3.c: New test.

From-SVN: r179929