[patch] m68k.h: Add "interrupt_thread" attribute.

[Kazu Hirata]

Hi Jeff and Andreas,

> gcc/
> 2007-04-27  Kazu Hirata  <kazu@codesourcery.com>
> 
> 	* config/m68k/m68k-protos.h: Rename m68k_interrupt_function_p
> 	to m68k_get_function_kind.  Update its prototype.
> 	* config/m68k/m68k.c (m68k_attribute_table): Add an entry for
> 	interrupt_thread.
> 	(m68k_interrupt_function_p): Return enum m68k_function_type
> 	instead of bool.  Rename to m68k_get_function_kind.
> 	(m68k_handle_fndecl_attribute): Reject interrupt_thread if the
> 	target is not fido.
> 	(m68k_compute_frame_layout): Don't mark any register for save
> 	if an interrupt_thread attribute is specified.
> 	(m68k_hard_regno_rename_ok): Update a use of
> 	m68k_interrupt_function_p.
> 	* config/m68k/m68k.h (EPILOGUE_USES): Update a use of
> 	m68k_interrupt_function_p.
> 	(m68k_function_type): New.
> 	* config/m68k/m68k.md (*return): Output a 'sleep' instruction
> 	for a function with an interrupt_thread attribute.
> 	* doc/extend.texi: Document the interrupt_thread attribute.
> 
> gcc/testsuite/
> 2007-04-27  Kazu Hirata  <kazu@codesourcery.com>
> 
> 	* gcc.target/m68k/interrupt_thread-1.c,
> 	gcc.target/m68k/interrupt_thread-2.c,
> 	gcc.target/m68k/interrupt_thread-3.c: New.
> 	* gcc.target/m68k/m68k.exp: Accept fido.

Do you have a comment about this patch?  Roman Zippel expressed some 
implementation ideas, but is the feature itself OK?

The original post is at:

http://gcc.gnu.org/ml/gcc-patches/2007-04/msg01880.html

Thanks,

Kazu Hirata