i386.md (round<mode>2): New expander.

i386.md (round<mode>2): New expander.

	* config/i386/i386.md (round<mode>2): New expander.
	* config/i386/i386.c (enum ix86_builtins): Add
	IX86_BUILTIN_ROUND{PS,PD}_AZ{,256}.
	(struct builtin_description): Add __builtin_ia32_round{ps,pd}_az{,256}
	descriptions.
	(ix86_builtin_vectorized_function): Handle BUILT_IN_ROUND{,F} builtins.

testsuite/ChangeLog:

	* gcc.target/i386/sse_4_1-round-vec.c: New test.
	* gcc.target/i386/sse_4_1-roundf-vec.c: New test.
	* gcc.target/i386/avx-round-vec.c: New test.
	* gcc.target/i386/avx-roundf-vec.c: New test.

From-SVN: r178123