extend.texi (Function Attributes): Document the IA-64 version of the "model" attribute.

extend.texi (Function Attributes): Document the IA-64 version of the "model" attribute.

        * doc/extend.texi (Function Attributes): Document the IA-64 version
        of the "model" attribute.

        * config/ia64/ia64.h (SYMBOL_FLAG_SMALL_ADDR): New macro.
        (SYMBOL_REF_SMALL_ADDR_P): Ditto.
        (PREDICATE_CODES): Mention "small_addr_symbolic_operand".

        * config/ia64/ia64.c (ia64_handle_model_attribute): New function.
        (ia64_encode_section_info): Likewise.
        (ia64_attribute_table): Add "model" attribute.
        (TARGET_ENCODE_SECTION_INFO): Define.
        (small_addr_symbolic_operand): New function.
        (got_symbolic_operand): Return 0 for a symbolref to an object
        in the small address area.
        (enum ia64_addr_area): New type.
        (small_ident1): New variable.
        (small_ident2): Likewise.
        (init_idents): New function.
        (ia64_get_addr_area): Likewise.
        (ia64_encode_addr_area): Likewise.
        (ia64_encode_section_info): Likewise.
        (ia64_expand_load_address): For symbolic references to objects in
        the small-address-area, load the address via gen_rtx_SET() (which,
        eventually, will expand into "addl").

From-SVN: r70209