config.gcc: Add arm_bf16.h.

2020-01-10  Stam Markianos-Wright  <stam.markianos-wright@arm.com>

	* config.gcc: Add arm_bf16.h.
	* config/aarch64/aarch64-builtins.c
	(aarch64_simd_builtin_std_type): Add BFmode.
	(aarch64_init_simd_builtin_types): Define element types for vector
	types.
	(aarch64_init_bf16_types): New function.
	(aarch64_general_init_builtins): Add arm_init_bf16_types function call.
	* config/aarch64/aarch64-modes.def: Add BFmode and V4BF, V8BF vector
	modes.
	* config/aarch64/aarch64-simd-builtin-types.def: Add BF SIMD types.
	* config/aarch64/aarch64-simd.md: Add BF vector types to NEON move
	patterns.
	* config/aarch64/aarch64.h (AARCH64_VALID_SIMD_DREG_MODE): Add V4BF.
	(AARCH64_VALID_SIMD_QREG_MODE): Add V8BF.
	* config/aarch64/aarch64.c
	(aarch64_classify_vector_mode): Add support for BF types.
	(aarch64_gimplify_va_arg_expr): Add support for BF types.
	(aarch64_vq_mode): Add support for BF types.
	(aarch64_simd_container_mode): Add support for BF types.
	(aarch64_mangle_type): Add support for BF scalar type.
	* config/aarch64/aarch64.md: Add BFmode to movhf pattern.
	* config/aarch64/arm_bf16.h: New file.
	* config/aarch64/arm_neon.h: Add arm_bf16.h and Bfloat vector types.
	* config/aarch64/iterators.md: Add BF types to mode attributes.
	(HFBF, GPF_TF_F16_MOV, VDMOV, VQMOV, VQMOV_NO2Em VALL_F16MOV): New.

2020-01-10  Stam Markianos-Wright  <stam.markianos-wright@arm.com>

	* g++.dg/abi/mangle-neon-aarch64.C: Add Bfloat SIMD types to test.
	* g++.dg/ext/arm-bf16/bf16-mangle-aarch64-1.C: New test.
	* gcc.target/aarch64/bfloat16_scalar_1.c: New test.
	* gcc.target/aarch64/bfloat16_scalar_2.c: New test.
	* gcc.target/aarch64/bfloat16_scalar_3.c: New test.
	* gcc.target/aarch64/bfloat16_scalar_4.c: New test.
	* gcc.target/aarch64/bfloat16_simd_1.c: New test.
	* gcc.target/aarch64/bfloat16_simd_2.c: New test.
	* gcc.target/aarch64/bfloat16_simd_3.c: New test.

From-SVN: r280129