AVX-512. 68/n. Add vpmullw, vpacksdw, pmaddwd insn.

AVX-512. 68/n.  Add vpmullw, vpacksdw, pmaddwd insn.

gcc/
	* config/i386/sse.md
	(define_c_enum "unspec"): Add UNSPEC_PMADDWD512.
	(define_mode_iterator VI2_AVX2): Add V32HI mode.
	(define_expand "mul<mode>3<mask_name>"): Add masking.
	(define_insn "*mul<mode>3<mask_name>"): Ditto.
	(define_expand "<s>mul<mode>3_highpart<mask_name>"): Ditto.
	(define_insn "*<s>mul<mode>3_highpart<mask_name>"): Ditto.
	(define_insn "avx512bw_pmaddwd512<mode><mask_name>"): New.
	(define_mode_attr SDOT_PMADD_SUF): Ditto.
	(define_expand "sdot_prod<mode>"): Add <SDOT_PMADD_SUF>.
	(define_insn "<sse2_avx2>_packssdw<mask_name>"): Add masking.
	(define_insn "*<ssse3_avx2>_pmulhrsw<mode>3<mask_name>"): Ditto.
	(define_insn "avx2_packusdw"): Delete.
	(define_insn "sse4_1_packusdw"): Ditto.
	(define_insn "<sse4_1_avx2>_packusdw<mask_name>"): New.

Co-Authored-By: Andrey Turetskiy <andrey.turetskiy@intel.com>
Co-Authored-By: Anna Tikhonova <anna.tikhonova@intel.com>
Co-Authored-By: Ilya Tocar <ilya.tocar@intel.com>
Co-Authored-By: Ilya Verbin <ilya.verbin@intel.com>
Co-Authored-By: Kirill Yukhin <kirill.yukhin@intel.com>
Co-Authored-By: Maxim Kuznetsov <maxim.kuznetsov@intel.com>
Co-Authored-By: Michael Zolotukhin <michael.v.zolotukhin@intel.com>
From-SVN: r216185