rs6000.c (rs6000_default_long_calls, [...]): New.

	* config/rs6000/rs6000.c (rs6000_default_long_calls,
	rs6000_longcall_switch, rs6000_set_default_type_attributes): New.
	(TARGET_SET_DEFAULT_TYPE_ATTRIBUTES): Set it.
	(rs6000_override_options): Handle -m(no-)longcall.
	(init_cumulative_args, output_mi_thunk): Check for both
	longcall and shortcall attributes on the function.
	(rs6000_attribute_table): Add "shortcall".
	(rs6000_handle_longcall_attribute): Update comment.
	(altivec_expand_unop_builtin, altivec_expand_binop_builtin,
	altivec_expand_ternop_builtin): Add default clauses to switches
	to silence warnings.

	* config/rs6000/rs6000.h: Declare rs6000_longcall_switch and
	rs6000_default_long_calls.  Define REGISTER_TARGET_PRAGMAS.
	(TARGET_OPTIONS): Add longcall and no-longcall.

	* config/rs6000/rs6000.md (call_nonlocal_sysv,
	call_value_nonlocal_sysv): Split by alternatives.  One pair
	accepts only SYMBOL_REFs and rejects if CALL_LONG is set in
	the call cookie.  The other pair accepts only LR/CTR and has
	no restriction.

	* config.gcc (rs6000-*-* | powerpc*-*-* trailer stanza):
	Set c_target_objs, cxx_target_objs; add t-rs6000-c-rule to
	tmake_file.
	* config/rs6000/rs6000-c.c: New file.
	* config/rs6000/t-rs6000-c-rule: New file.
	* config/rs6000/rs6000-protos.c: Add multiple-include guard.
	Prototype rs6000_pragma_longcall.

	* doc/extend.texi: Document shortcall attribute.
	* doc/invoke.texi: Document -mlongcall, -mno-longcall.

From-SVN: r53382