[arm] Remove obsolete FPA support (8/n): Cleanup addressing and register usage

[Richard Earnshaw <rearnsha at arm dot com>]

This is the last significant patch for the core part of the compiler, it
removes the last significant remnants of the code that supports the FPA
and Maverick.  There are a lot of interwoven definitions that makes it
relatively hard to do this piecemeal and it was easier to do this in one
fell swoop.

Since there was a significant amount of renumbering needed, I've also
taken the opportunity to clean up the code a bit.  In particular I've:

- Re-ordered some of the register bit fields so that significant
allocations don't cross 32-bit boundaries (mostly cosmetic)
- Re-defined some of the register numbering macros so that they are
chained (makes future re-numberings simpler).
- switched the compiler to using "r10" instead of "sl" in assembly
language.  SL is a hangover from the original APCS days, and even their
it only had a sensible meaning in some variants of the APCS.

Tested on arm-eabi and arm-linux (with and without VFP).  I've also done
some basic testing on wmmx to ensure that nothing obvious is broken; but
I don't have any HW to do full tests in that configuration.


Applied to trunk.

R.

2012-07-07  Richard Earnshaw  <rearnsha@arm.com>

	* arm.h (TARGET_CPU_CPP_BUILTINS): Remove Maverick support.
	(TARGET_FPA): Delete definition.
	(TARGET_MAVERICK): Likewise.
	(TARGET_FPA_EMU2): Likewise.
	(arm_fp_model): Remove FPA and Maverick models.
	(arm_arch_cirrus): Delete declaration.
	(FLOAT_WORDS_BIG_ENDIAN): Delete definition.
	(FIXED_REGISTERS): Remove FPA and Maverick support.  Reorganize.
	(CALL_USED_REGISTERS): Likewise.
	(FIRST_FPA_REGNUM, LAST_FPA_REGNUM): Delete definition.
	(FIRST_VFP_REGNUM): Renumbered.
	(D7_VFP_REGNUM): Chain definition.
	(LAST_LO_VFP_REGNUM): Likewise.
	(FIRST_HI_VFP_REGNUM): Likewise.
	(LAST_HI_VFP_REGNUM): Likewise.
	(FIRST_IWMMXT_GR_REGNUM): Likewise.
	(LAST_IWMMXT_GR_REGNUM): Likewise.
	(FIRST_IWMMXT_REGNUM): Likewise.
	(LAST_IWMMXT_REGNUM): Likewise.
	(FRAME_POINTER_REGNUM): Renumbered.
	(ARG_POINTER_REGNUM): Renumbered.
	(FIRST_PSEUDO_REGISTER): Remove FPA and Maverick registers.
	(FIRST_CIRRUS_FP_REGNUM, LAST_CIRRUS_FP_REGNUM): Delete definitions.
	(HARD_REGNO_REGNUM): Remove FPA support.
	(REG_ALLOC_ORDER): Remove FPA and Maverick registers.  Reorganize.
	(reg_class): Likewise.
	(REG_CLASS_NAMES): Likewise.
	(REG_CLASS_CONTENTS): Likewise.
	(CANNOT_CHANGE_MODE_CLASS): Never true.  Update comment.
	(SECONDARY_INPUT_RELOAD_CLASS): Remove Maverick support.
	(CLASS_MAX_NREGS): Remove FPA and Maverick support.
	* aout.h (REGISTER_NAMES): Remove FPA and Maverick registers.
	Reorganize.  Use AAPCS preferred names.
	(ADDITIONAL_REGISTER_NAMES): Remove aliases for Maverick.  Update
	comments.
	(OVERLAPPING_REGISTER_NAMES): Update register numbering.
	* arm.c (FL_CIRRUS): Delete definition.
	(arm_arch_cirrus): Delete variable.
	(arm_float_words_big_endian): Delete function.
	(cirrus_memory_offset): Delete function.
	(output_mov_long_double_fpa_from_arm): Delete function.
	(output_mov_long_double_arm_from_fpa): Delete function.
	(output_mov_double_fpa_from_arm): Delete function.
	(output_mov_double_arm_from_fpa): Delete function.
	(emit_sfm): Delete function.
	(maybe_get_arm_condition_code): Update comment.
	(arm_file_start): Always use softvfp for softfloat systems.
	(thumb_core_reg_alloc_order): Adjust for updated register allocation.
	(arm_option_override): Remove FPA and Maverick support.  Always
	default to vfp as the fallback FPU format.
	(use_return_insn): Remove FPA support.
	(arm_get_frame_offsets): Likewise.
	(arm_save_coproc_regs): Likewise.
	(arm_canonicalize_comparison): Remove Maverick support.
	(arm_select_cc_mode): Likewise.
	(arm_gen_compare_reg): Likewise.
	(arm_print_operand): Likewise.
	(arm_libcall_value_1): Remove FPA and Maverick support.
	(arm_function_value_regno_p): Likewise.
	(arm_apply_result_size): Likewise.
	(arm_legitimate_index_p): Likewise.
	(thumb2_legitimate_index_p): Likewise.
	(legitimize_reload_address): Likewise.
	(arm_register_move_cost): Likewise.
	(arm_hard_regno_mode_ok): Likewise.
	(arm_regno_class): Likewise.
	(arm_dbx_register_number): Likewise.
	(arm_emit_unwind_sequence): Likewise.
	(arm_conditional_register_usage): Likewise.
	* arm-protos.h (neg_const_double_rtx_ok_for_fpa): Remove declaration.
	(cirrus_memory_offset): Likewise.
	(output_move_long_double_fpa_from_arm): Likewise.
	(output_move_long_double_arm_from_fpa): Likewise.
	(output_move_double_fpa_from_arm): Likewise.
	(output_move_double_arm_from_fpa): Likewise.
	(arm_float_words_big_endian): Likewise.
	* arm.md (CC_REGNUM): Renumbered.
	(VFPCC_REGNUM): Moved here.  Renumbered.
	(FPA_F0_REGNUM, FPA_F7_REGNUM): Delete.
	(attr fpu): Remove FPA and Maverick support.
	* vfp.md (VFPCC_REGNUM): Delete.  Moved to arm.md.
	* arm-cores.def (ep9312): Remove Maverick support.
	* arm-arches.def (ep9312): Delete architecture.
	* arm-tables.opt: Regenerated.

	* arm/linux-elf.h (FPUTYPE_DEFAULT): Set to vfp.

Attachment: nofpa8.patch
Description: Text document