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Initial support for 64/32bit vectorization for AVX512FP16

Hongyu Wang requested to merge users/intel/hongyuw1/64_32bit_fp16vect into users/intel/64_32bit_vect/master

For 32bit target, V4HF vector is parsed same as __m64 type, V2HF is parsed by stack and returned from GPR since it is not specified by ABI.

gcc/ChangeLog:

PR target/102230
* config/i386/i386.h (VALID_AVX512FP16_REG_MODE): Add
V4HF and V2HF mode check.
(VALID_SSE2_REG_VHF_MODE): Likewise.
(VALID_MMX_REG_MODE): Likewise.
* config/i386/i386.c (classify_argument): Parse V4HF/V2HF
via sse regs.
(function_arg_32): Add V4HFmode.
(function_arg_advance_32): Likewise.
(ix86_compat_function_arg_boundary): Avoid warning for V4HF.
* config/i386/i386.md (mode): Add V4HF/V2HF.
(MODE_SIZE): Likewise.
* config/i386/mmx.md (MMXMODE): Add V4HF mode.
(V_32): Add V2HF mode.
(*mov<mode>_internal): Adjust sse alternatives to support
V4HF mode vector move.
(*mov<mode>_internal): Adjust sse alternatives
to support V2HF mode move.
* config/i386/sse.md (VHF_32_64): New mode iterator.
(<insn><mode>3): New define_expand for add/sub/mul/div.
(*avx512fp16_<insn><mode>3): New define_insn.
(*movv4hf_internal_sse): New define_insn for -mno-mmx and -msse.

gcc/testsuite/ChangeLog:

PR target/102230
* gcc.target/i386/avx512fp16-floatvnhf.c: Remove xfail.
* gcc.target/i386/avx512fp16-trunc-extendvnhf.c: Ditto.
* gcc.target/i386/avx512fp16-truncvnhf.c: Ditto.
* gcc.target/i386/avx512fp16-64-32-vecop-1.c: New test.
* gcc.target/i386/avx512fp16-64-32-vecop-2.c: Ditto.
* gcc.target/i386/pr102230.c: Ditto.
Edited by Hongyu Wang

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