* config.gcc: Add an extra_header for ARM targets.

	* config.gcc: Add an extra_header for ARM targets.
        Support configuring with --with-cpu=iwmmxt.
	* doc/invoke.texi: Document new value for -mcpu= ARM switch.
        * config/arm/aof.h (REGISTER_NAMES): Add iwmmxt register
	names.  Fix formatting.
        * config/arm/aout.h (REGISTER_NAMES): Add iwmmxt register
	names.
        * config/arm/arm-protos.h (arm_emit_vector_const): New
	prototype.
	(arm_output_load_gr): New prototype.
	* config/arm/arm.c (extra_reg_names1): Delete.
        (TARGET_INIT_BUILTINS, TARGET_EXPAND_BUILTIN, FL_IWMMXT,
	* arch_is_iwmmxt): Define.
	(all_cores, all_architecture): Add entry for iwmmxt.
	(arm_override_options): Add support for iwmmxt.
	(use_return_insn, arm_function_arg, arm_legitimate_index_p,
	arm_print_value, arm_rtx_costs_1, output_move_double,
	arm_compute_save_reg_mask, arm_output_epilogue,
	arm_get_frame_size, arm_expand_prologue, arm_print_operand,
	arm_assemble_integer, arm_hard_regno_ok, arm_regno_class):
	Likewise.
	(arm_init_cumulative_args): Count iwmmxt registers.
	(arm_function_ok_for_sibcall): Return false of sibcall_blocked
	has been set.
	(struct minipool_node): Add fix_size field.
	(add_minipool_forward_ref): Add support for 8-byte aligning of
	the pool.
	(add_minipool_backward_ref, add_minipool_offsets,
	dump_minipool, push_minipool_fix): Likewise.
	(struct builtin_description): New struct.
        (builtin_description): New array of iwmmxt builtin functions.
        (arm_init_iwmmxt_builtins): New function.
        (arm_init_builtins): New function.
        (safe_vector_operand): New function.
        (arm_expand_binop_builtin): New function.
        (arm_expand_unop_builtin): New function.
        (arm_expand_builtin): New function.
        (arm_emit_vector_const): New function.
        (arm_output_load_gr): New function.
        * config/arm/arm.h (TARGET_CPU_iwmmxt, TARGET_IWMMXT,
	TARGET_REALLY_IWMMXT, arm_arch_iwmmxt, IWMMXT_ALIGNMENT,
	TYPE_NEEDS_IWMMXT_ALIGNMENT, ADJUST_FIELD_ALIGN,
	DATA_ALIGNMENT, LOCAL_ALIGNMENT, VECTOR_MODE_SUPPORTED_P): Define.
        (BIGGEST_ALIGNMENT): Set to 64 if ATPCS support is enabled.
        (CPP_CPU_ARCH_SPEC): Add entries for iwmmxt.
        (FIXED_REGISTERS, CALL_USED_REGISTERS, REG_ALLOC_ORDER,
	reg_class, REG_CLASS_NAMES, REG_CLASS_CONTENTS,
	REG_CLASS_FOR_LETTER): Add iwmmxt registers.
        (SUBTARGET_CONDITIONAL_REGISTER_USAGE): Disable iwmmxt
	registers unless the iwmmxt target is selected.
        (FIRST_IWMMXT_GR_REGNUM, LAST_IWMMXT_GR_REGNUM,
	FIRST_IWMMXT_REGNUM, LAST_IWMMXT_REGNUM, IS_IWMMXT_REGNUM,
	IS_IWMMXT_GR_REGNUM): Define.
        (FIRST_PSEUDO_REGISTER): Bump to 63.
        (struct machine_function): Add sibcall_blocked field.
        (Struct CUMULATIVE_ARGS): Add iwmmxt_nregs, named_count and
	nargs fields.
        (enum arm_builtins): New enum list.
        * config/arm/arm.md (UNSPEC_WSHUFH, UNSPEC_WACC,
	UNSPEC_TMOVMSK, UNSPEC_WSAD, UNSPEC_WSADZ, UNSPEC_WMACS,
	UNSPEC_WMACU, UNSPEC_WMACSZ, UNSPEC_WMACUZ, UNSPEC_CLRDI,
	UNSPEC_WMADDS, UNSPEC_WMADDU): New unspecs.
	(VUNSPEC_TMRC, VUNSPEC_TMCR, VUNSPEC_ALIGN8, VUNSPEC_WCMP_EQ,
	VUNSPEC_WCMP_GTU, VUNSPEC_WCMP_GT): New vunspecs.
        (movv2si, movv4hi, movv8qi): New expands for vector moves.
        Include iwmmxt.md.
	* config/arm/t-xscale-elf (MULTILIB_OPITONS): Add iwmmxt
	multilib.
        (MULTILIB_DIRNAMES, MULTILIB_REDUNDANT_DIRS): Likewise.
        * config/arm/mmintrin.h: New ARM specific header file.
        * config/arm/iwmmx.md: New iWMMXt specific machine patterns.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@68157 138bc75d-0d04-0410-961f-82ee72b054a4