[ARM][GCC][1/x]: MVE ACLE intrinsics framework patch.

[ARM][GCC][1/x]: MVE ACLE intrinsics framework patch.

This patch creates the required framework for MVE ACLE intrinsics.

The following changes are done in this patch to support MVE ACLE intrinsics.

Header file arm_mve.h is added to source code, which contains the definitions of MVE ACLE intrinsics
and different data types used in MVE. Machine description file mve.md is also added which contains the
RTL patterns defined for MVE.

A new reigster "p0" is added which is used in by MVE predicated patterns. A new register class "VPR_REG"
is added and its contents are defined in REG_CLASS_CONTENTS.

The vec-common.md file is modified to support the standard move patterns. The prefix of neon functions
which are also used by MVE is changed from "neon_" to "simd_".
eg: neon_immediate_valid_for_move changed to simd_immediate_valid_for_move.

In the patch standard patterns mve_move, mve_store and move_load for MVE are added and neon.md and vfp.md
files are modified to support this common patterns.

Please refer to Arm reference manual [1] for more details.

[1] https://developer.arm.com/docs/ddi0553/latest

2020-03-06  Andre Vieira  <andre.simoesdiasvieira@arm.com>
	    Mihail Ionescu  <mihail.ionescu@arm.com>
	    Srinath Parvathaneni  <srinath.parvathaneni@arm.com>

	* config.gcc (arm_mve.h): Include mve intrinsics header file.
	* config/arm/aout.h (p0): Add new register name for MVE predicated
	cases.
	* config/arm-builtins.c (ARM_BUILTIN_SIMD_LANE_CHECK): Define macro
	common to Neon and MVE.
	(ARM_BUILTIN_NEON_LANE_CHECK): Renamed to ARM_BUILTIN_SIMD_LANE_CHECK.
	(arm_init_simd_builtin_types): Disable poly types for MVE.
	(arm_init_neon_builtins): Move a check to arm_init_builtins function.
	(arm_init_builtins): Use ARM_BUILTIN_SIMD_LANE_CHECK instead of
	ARM_BUILTIN_NEON_LANE_CHECK.
	(mve_dereference_pointer): Add function.
	(arm_expand_builtin_args): Call to mve_dereference_pointer when MVE is
	enabled.
	(arm_expand_neon_builtin): Moved to arm_expand_builtin function.
	(arm_expand_builtin): Moved from arm_expand_neon_builtin function.
	* config/arm/arm-c.c (__ARM_FEATURE_MVE): Define macro for MVE and MVE
	with floating point enabled.
	* config/arm/arm-protos.h (neon_immediate_valid_for_move): Renamed to
	simd_immediate_valid_for_move.
	(simd_immediate_valid_for_move): Renamed from
	neon_immediate_valid_for_move function.
	* config/arm/arm.c (arm_options_perform_arch_sanity_checks): Generate
	error if vfpv2 feature bit is disabled and mve feature bit is also
	disabled for HARD_FLOAT_ABI.
	(use_return_insn): Check to not push VFP regs for MVE.
	(aapcs_vfp_allocate): Add MVE check to have same Procedure Call Standard
	as Neon.
	(aapcs_vfp_allocate_return_reg): Likewise.
	(thumb2_legitimate_address_p): Check to return 0 on valid Thumb-2
	address operand for MVE.
	(arm_rtx_costs_internal): MVE check to determine cost of rtx.
	(neon_valid_immediate): Rename to simd_valid_immediate.
	(simd_valid_immediate): Rename from neon_valid_immediate.
	(simd_valid_immediate): MVE check on size of vector is 128 bits.
	(neon_immediate_valid_for_move): Rename to
	simd_immediate_valid_for_move.
	(simd_immediate_valid_for_move): Rename from
	neon_immediate_valid_for_move.
	(neon_immediate_valid_for_logic): Modify call to neon_valid_immediate
	function.
	(neon_make_constant): Modify call to neon_valid_immediate function.
	(neon_vector_mem_operand): Return VFP register for POST_INC or PRE_DEC
	for MVE.
	(output_move_neon): Add MVE check to generate vldm/vstm instrcutions.
	(arm_compute_frame_layout): Calculate space for saved VFP registers for
	MVE.
	(arm_save_coproc_regs): Save coproc registers for MVE.
	(arm_print_operand): Add case 'E' to print memory operands for MVE.
	(arm_print_operand_address): Check to print register number for MVE.
	(arm_hard_regno_mode_ok): Check for arm hard regno mode ok for MVE.
	(arm_modes_tieable_p): Check to allow structure mode for MVE.
	(arm_regno_class): Add VPR_REGNUM check.
	(arm_expand_epilogue_apcs_frame): MVE check to calculate epilogue code
	for APCS frame.
	(arm_expand_epilogue): MVE check for enabling pop instructions in
	epilogue.
	(arm_print_asm_arch_directives): Modify function to disable print of
	.arch_extension "mve" and "fp" for cases where MVE is enabled with
	"SOFT FLOAT ABI".
	(arm_vector_mode_supported_p): Check for modes available in MVE interger
	and MVE floating point.
	(arm_array_mode_supported_p): Add TARGET_HAVE_MVE check for array mode
	pointer support.
	(arm_conditional_register_usage): Enable usage of conditional regsiter
	for MVE.
	(fixed_regs[VPR_REGNUM]): Enable VPR_REG for MVE.
	(arm_declare_function_name): Modify function to disable print of
	.arch_extension "mve" and "fp" for cases where MVE is enabled with
	"SOFT FLOAT ABI".
	* config/arm/arm.h (TARGET_HAVE_MVE): Disable for soft float abi and
	when target general registers are required.
	(TARGET_HAVE_MVE_FLOAT): Likewise.
	(FIXED_REGISTERS): Add bit for VFP_REG class which is enabled in arm.c
	for MVE.
	(CALL_USED_REGISTERS): Set bit for VFP_REG class in CALL_USED_REGISTERS
	which indicate this is not available for across function calls.
	(FIRST_PSEUDO_REGISTER): Modify.
	(VALID_MVE_MODE): Define valid MVE mode.
	(VALID_MVE_SI_MODE): Define valid MVE SI mode.
	(VALID_MVE_SF_MODE): Define valid MVE SF mode.
	(VALID_MVE_STRUCT_MODE): Define valid MVE struct mode.
	(VPR_REGNUM): Add Vector Predication Register in arm_regs_in_sequence
	for MVE.
	(IS_VPR_REGNUM): Macro to check for VPR_REG register.
	(REG_ALLOC_ORDER): Add VPR_REGNUM entry.
	(enum reg_class): Add VPR_REG entry.
	(REG_CLASS_NAMES): Add VPR_REG entry.
	* config/arm/arm.md (VPR_REGNUM): Define.
	(conds): Check is_mve_type attrbiute to differentiate "conditional" and
	"unconditional" instructions.
	(arm_movsf_soft_insn): Modify RTL to not allow for MVE.
	(movdf_soft_insn): Modify RTL to not allow for MVE.
	(vfp_pop_multiple_with_writeback): Enable for MVE.
	(include "mve.md"): Include mve.md file.
	* config/arm/arm_mve.h: Add MVE intrinsics head file.
	* config/arm/constraints.md (Up): Constraint to enable "p0" register in MVE
	for vector predicated operands.
	* config/arm/iterators.md (VNIM1): Define.
	(VNINOTM1): Define.
	(VHFBF_split): Define
	* config/arm/mve.md: New file.
	(mve_mov<mode>): Define RTL for move, store and load in MVE.
	(mve_mov<mode>): Define move RTL pattern with vec_duplicate operator for
	second operand.
	* config/arm/neon.md (neon_immediate_valid_for_move): Rename with
	simd_immediate_valid_for_move.
	(neon_mov<mode>): Split pattern and move expand pattern "movv8hf" which
	is common to MVE and  NEON to vec-common.md file.
	(vec_init<mode><V_elem_l>): Add TARGET_HAVE_MVE check.
	* config/arm/predicates.md (vpr_register_operand): Define.
	* config/arm/t-arm: Add mve.md file.
	* config/arm/types.md (mve_move): Add MVE instructions mve_move to
	attribute "type".
	(mve_store): Add MVE instructions mve_store to attribute "type".
	(mve_load): Add MVE instructions mve_load to attribute "type".
	(is_mve_type): Define attribute.
	* config/arm/vec-common.md (mov<mode>): Modify RTL expand to support
	standard move patterns in MVE along with NEON and IWMMXT with mode
	iterator VNIM1.
	(mov<mode>): Modify RTL expand to support standard move patterns in NEON
	and IWMMXT with mode iterator V8HF.
	(movv8hf): Define RTL expand to support standard "movv8hf" pattern in
	NEON and MVE.
	* config/arm/vfp.md (neon_immediate_valid_for_move): Rename to
	simd_immediate_valid_for_move.

2020-03-16  Andre Vieira  <andre.simoesdiasvieira@arm.com>
            Mihail Ionescu  <mihail.ionescu@arm.com>
            Srinath Parvathaneni  <srinath.parvathaneni@arm.com>

	* gcc.target/arm/mve/intrinsics/mve_vector_float.c: New test.
	* gcc.target/arm/mve/intrinsics/mve_vector_float1.c: Likewise.
	* gcc.target/arm/mve/intrinsics/mve_vector_float2.c: Likewise.
	* gcc.target/arm/mve/intrinsics/mve_vector_int.c: Likewise.
	* gcc.target/arm/mve/intrinsics/mve_vector_int1.c: Likewise.
	* gcc.target/arm/mve/intrinsics/mve_vector_int2.c: Likewise.
	* gcc.target/arm/mve/intrinsics/mve_vector_uint.c: Likewise.
	* gcc.target/arm/mve/intrinsics/mve_vector_uint1.c: Likewise.
	* gcc.target/arm/mve/intrinsics/mve_vector_uint2.c: Likewise.
	* gcc.target/arm/mve/mve.exp: New file.
	* lib/target-supports.exp
	(check_effective_target_arm_v8_1m_mve_fp_ok_nocache): Proc to check
	armv8.1-m.main+mve.fp and returning corresponding options.
	(check_effective_target_arm_v8_1m_mve_fp_ok): Proc to call
	check_effective_target_arm_v8_1m_mve_fp_ok_nocache to check support of
	MVE with floating point on the current target.
	(add_options_for_arm_v8_1m_mve_fp): Proc to call
	check_effective_target_arm_v8_1m_mve_fp_ok to return corresponding
	compiler options for MVE with floating point.
	(check_effective_target_arm_v8_1m_mve_ok_nocache): Modify to test and
	return hard float-abi on success.