Restoration of arg pointer in expand_builtin_setjmp_receiver

[John David Anglin]

> Try this.
> 
> 	* function.c (expand_function_end): Don't init arg_pointer_save_area.
> 	(get_arg_pointer_save_area): New.  Create an init it here.
> 	(fix_lexical_addr): Use it.
> 	* function.h: Declare it.
> 	* builtins.c (expand_builtin_setjmp_receiver): Use it.
> 	* stmt.c (expand_nl_goto_receiver): Use it.

Looks promising.  I did a quick check using a cross compiler and it now
looks like the "arg pointer" is saved and restored properly.  I will run
more tests tomorrow.  The vax is presently running the testsuite which
I would like to let it complete for reference.

The code generated is a bit peculiar:

        addl3 ap,$4,-48(fp)
	...
	subl3 $4,-48(fp),ap

Why are we using `virtual_incoming_args_rtx' rather than `arg_pointer_rtx'?
There is a 4 byte offset between the two on the vax because calls pushes
an argument count.  It seems a bit strange to be saving and restoring
a virtual register.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)