AVX512FP16: Add float(uns)?mn2 expander

gcc/ChangeLog:

	* config/i386/sse.md (float<floatunssuffix><mode><ssePHmodelower>2):
	New expander.
	(avx512fp16_vcvt<floatsuffix><sseintconvert>2ph_<mode>):
	Rename to ...
	(float<floatunssuffix><mode>v4hf2): ... this, and drop constraints.
	(avx512fp16_vcvt<floatsuffix>qq2ph_v2di): Rename to ...
	(float<floatunssuffix>v2div2hf2): ... this, and likewise.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/avx512fp16-floatvnhf.c: New test.
2 files changed