AVX-512. Add pd2dq and dq2pd converts.

AVX-512. Add pd2dq and dq2pd converts.

gcc/
	* config/i386/i386.c
	(avx512f_ufix_notruncv8dfv8si_mask_round): Rename to ...
	(ufix_notruncv8dfv8si2_mask_round): ... this.
	* config/i386/sse.md
	(define_insn "avx512f_cvtdq2pd512_2): Update TARGET check.
	(define_insn "avx_cvtdq2pd256_2"): Add EVEX version.
	(define_insn "sse2_cvtdq2pd<mask_name>"): Add masking.
	(define_insn "avx_cvtpd2dq256<mask_name>"): Ditto.
	(define_expand "sse2_cvtpd2dq"): Delete.
	(define_insn "sse2_cvtpd2dq<mask_name>"): Add masking and
	make 2nd operand const0 vector.
	(define_insn "avx512f_ufix_notruncv8dfv8si<mask_name><round_name>"):
	Delete.
	(define_mode_attr pd2udqsuff): New.
	(define_insn
	"ufix_notrunc<mode><si2dfmodelower>2<mask_name><round_name>"): Ditto.
	(define_insn "ufix_notruncv2dfv2si2<mask_name>"): Ditto.
	(define_insn "*avx_cvttpd2dq256_2"): Delete.
	(define_expand "sse2_cvttpd2dq"): Ditto.
	(define_insn "sse2_cvttpd2dq<mask_name>"): Add masking and
	make 2nd operand const0 vector.

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: r215584