AVX512FP16: Add expander for ceil/floor/trunc/roundeven.

gcc/ChangeLog:

	* config/i386/i386.md (<rounding_insn>hf2): New expander.
	(sse4_1_round<mode>2): Extend from MODEF to MODEFH.
	* config/i386/sse.md (*sse4_1_round<ssescalarmodesuffix>):
	Extend from VF_128 to VFH_128.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/avx512fp16-builtin-round-1.c: New test.
3 files changed