amdgcn: add multiple vector sizes

amdgcn: add multiple vector sizes

The vectors sizes are simulated using implicit masking, but they make life
easier for the autovectorizer and SLP passes.

gcc/ChangeLog:

	* config/gcn/gcn-modes.def (VECTOR_MODE): Add new modes
	V32QI, V32HI, V32SI, V32DI, V32TI, V32HF, V32SF, V32DF,
	V16QI, V16HI, V16SI, V16DI, V16TI, V16HF, V16SF, V16DF,
	V8QI, V8HI, V8SI, V8DI, V8TI, V8HF, V8SF, V8DF,
	V4QI, V4HI, V4SI, V4DI, V4TI, V4HF, V4SF, V4DF,
	V2QI, V2HI, V2SI, V2DI, V2TI, V2HF, V2SF, V2DF.
	(ADJUST_ALIGNMENT): Likewise.
	* config/gcn/gcn-protos.h (gcn_full_exec): Delete.
	(gcn_full_exec_reg): Delete.
	(gcn_scalar_exec): Delete.
	(gcn_scalar_exec_reg): Delete.
	(vgpr_1reg_mode_p): Use inner mode to identify vector registers.
	(vgpr_2reg_mode_p): Likewise.
	(vgpr_vector_mode_p): Use VECTOR_MODE_P.
	* config/gcn/gcn-valu.md (V_QI, V_HI, V_HF, V_SI, V_SF, V_DI, V_DF,
	V_QIHI, V_1REG, V_INT_1REG, V_INT_1REG_ALT, V_FP_1REG, V_2REG, V_noQI,
	V_noHI, V_INT_noQI, V_INT_noHI, V_ALL, V_ALL_ALT, V_INT, V_FP):
	Add additional vector modes.
	(V64_SI, V64_DI, V64_ALL, V64_FP): New iterators.
	(scalar_mode, SCALAR_MODE, vnsi, VnSI, vndi, VnDI, sdwa):
	Add additional vector mode mappings.
	(mov<mode>): Implement vector length conversions.
	(ldexp<mode>3<exec>): Use VnSI.
	(frexp<mode>_exp2<exec>): Likewise.
	(VCVT_MODE, VCVT_FMODE, VCVT_IMODE): Add additional vector modes.
	(reduc_<reduc_op>_scal_<mode>): Use V64_ALL.
	(fold_left_plus_<mode>): Use V64_FP.
	(*<reduc_op>_dpp_shr_<mode>): Use V64_1REG.
	(*<reduc_op>_dpp_shr_<mode>): Use V64_DI.
	(*plus_carry_dpp_shr_<mode>): Use V64_INT_1REG.
	(*plus_carry_in_dpp_shr_<mode>): Use V64_SI.
	(*plus_carry_dpp_shr_<mode>): Use V64_DI.
	(mov_from_lane63_<mode>): Use V64_2REG.
	* config/gcn/gcn.cc (VnMODE): New function.
	(gcn_can_change_mode_class): Support multiple vector sizes.
	(gcn_modes_tieable_p): Likewise.
	(gcn_operand_part): Likewise.
	(gcn_scalar_exec): Delete function.
	(gcn_scalar_exec_reg): Delete function.
	(gcn_full_exec): Delete function.
	(gcn_full_exec_reg): Delete function.
	(gcn_inline_fp_constant_p): Support multiple vector sizes.
	(gcn_fp_constant_p): Likewise.
	(A): New macro.
	(GEN_VN_NOEXEC): New macro.
	(GEN_VNM_NOEXEC): New macro.
	(GEN_VN): New macro.
	(GEN_VNM): New macro.
	(GET_VN_FN): New macro.
	(CODE_FOR): New macro.
	(CODE_FOR_OP): New macro.
	(gen_mov_with_exec): Delete function.
	(gen_duplicate_load): Delete function.
	(gcn_expand_vector_init): Support multiple vector sizes.
	(strided_constant): Likewise.
	(gcn_addr_space_legitimize_address): Likewise.
	(gcn_expand_scalar_to_vector_address): Likewise.
	(gcn_expand_scaled_offsets): Likewise.
	(gcn_secondary_reload): Likewise.
	(gcn_valid_cvt_p): Likewise.
	(gcn_expand_builtin_1): Likewise.
	(gcn_make_vec_perm_address): Likewise.
	(gcn_vectorize_vec_perm_const): Likewise.
	(gcn_vector_mode_supported_p): Likewise.
	(gcn_autovectorize_vector_modes): New hook.
	(gcn_related_vector_mode): Support multiple vector sizes.
	(gcn_expand_dpp_shr_insn): Add FIXME comment.
	(gcn_md_reorg): Support multiple vector sizes.
	(print_reg): Likewise.
	(print_operand): Likewise.
	(TARGET_VECTORIZE_AUTOVECTORIZE_VECTOR_MODES): New hook.