extend.texi: Document sseregparm target attribute.

extend.texi: Document sseregparm target attribute.

2005-06-16  Richard Guenther  <rguenth@gcc.gnu.org>

	* doc/extend.texi: Document sseregparm target attribute.
	Clarify fastcall and regparm documentation.
	* config/i386/i386.h: Adjust float_in_sse documentation.
	* config/i386/i386.c: Add new target attribute sseregparm.
	(ix86_handle_cdecl_attribute, ix86_handle_regparm_attribute):
	Merge into ...
	(ix86_handle_cconv_attribute): ... here.  Also handle
	sseregparm attribute.
	(ix86_comp_type_attributes): Compare sseregparm attributes.
	(ix86_function_sseregparm): New function, split out from ...
	(init_cumulative_args): ... here.  Use to decide use
	of SSE registers and error in case of missing support.
	(ix86_value_regno): Likewise.
	(function_arg_advance): Do not bail out for DFmode if we need
	to pass doubles in registers.
	(function_arg): Likewise.

	* gcc.target/i386/attributes-error.c: New testcase.
	* gcc.target/i386/fastcall-sseregparm.c: Likewise.
	* gcc.target/i386/regparm-stdcall.c: Likewise.
	* gcc.target/i386/sseregparm-1.c: Likewise.
	* gcc.target/i386/sseregparm-2.c: Likewise.

From-SVN: r101085