Contribution: iWMMXt architecture support for ARM

[Nick Clifton <nickc at redhat dot com>]

Hi Guys,

  I am applying the patch below to add support for Intel's second
  generation XScale architecture, known as iWMMXt or Intel Wireless
  Multimedia Extensions, to the ARM port.

  There are a couple of issues with this patch which Richard Earnshaw
  and I have been discussing, and which I hope to resolve over the
  next few months.  But I did not want to hold back on the patch any
  longer.  (In particular the ABI for the iWMMXt code may change in
  the future once the ATEPCS is ratified.  This may mean supporting
  the ABI as currently implemented by this patch as well as the
  proper, official ABI.  If this becomes necessary I will take on this
  role myself).

  I will also be adding an entry in the 3.4 changes section of the gcc
  HTML documentation.
  
Cheers
        Nick

gcc/ChangeLog
2003-06-18  Nick Clifton  <nickc@redhat.com>

	* 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_OPTIONS): 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.

Attachment: iwmmxt.patch.bz2
Description: Patch to add iWMMXt support to gcc