Support for official Sparc V9 ABI:

    Support for official Sparc V9 ABI:
        * sparc.c (sparc_override_options): Force stack bias off for !arch64.
        Care for flag_pcc_struct_return default.
        (output_move_quad): Rewrite to move by halves on v9 and in the
        proper direction.
        (move_quad_direction): New function.
        (output_fp_move_quad): Use it to determine the direction of copy.
        (function_arg_slotno): Return -1 for FP reg overflow as well.
        (function_arg_record_value*): New functions.
        (function_arg): Use them.  Streamline unprototyped parameter passing.
        (function_arg_pass_by_reference): Pass TCmode by reference.
        (function_value): New function.
        * sparc.h (PTRDIFF_TYPE, SIZE_TYPE): For -pedantic's sake, don't use
        long long in 64-bit mode.
        (RETURN_IN_MEMORY): v9 returns structs < 32-bytes in regs.
        (DEFAULT_PCC_STRUCT_RETURN): Make the default detectable.
        (BASE_RETURN_VALUE_REG): Consider complex float types for arch64.
        (BASE_OUTGOING_VALUE_REG, BASE_PASSING_ARG_REG): Likewise.
        (BASE_INCOMING_ARG_REG): Likewise.
        (FUNCTION_VALUE): Call function_value.
        (FUNCTION_OUTGOING_VALUE, LIBCALL_VALUE): Likewise.
        * sparc.md (movdi_sp32_v9): Disable for arch64.
        (movsf, movdf, movtf): Sort all ulternatives using fp regs first.
        (call_value_address_sp64): Remove register class constraints.
        (call_value_symbolic_sp64): Likewise.
        (nonlocal_goto): Pass label reg directly to goto_handlers.  Constrain
        v9 case to 32-bit constants.
        (goto_handler_and_restore_v9): Provide a version for arch64.
        * sparc/linux64.h (SIZE_TYPE, PTRDIFF_TYPE): Remove private definition.
        * sparc/sp64-aout.h (TARGET_DEFAULT): Turn on stack bias.
        (CPP_PREDEFINES): New.
        * sparc/sp64-elf.h: Likewise.
        (PREFERRED_DEBUGGING_TYPE): Dwarf2.
        (ASM_OUTPUT_DWARF2_ADDR_CONST): New.
        * sparc/sysv4.h (SIZE_TYPE, PTRDIFF_TYPE): Undo svr4.h's changes.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@19526 138bc75d-0d04-0410-961f-82ee72b054a4