Patch: fix regression in sibcalls (ppc & elsewhere) redone

[Dale Johannesen <dalej at apple dot com>]

One more time.  This does what Geoff suggested.  Bootstrapped and 
tested on Darwin.

2003-01-06  Dale Johannesen  <dalej@apple.com>

        * function.c (assign_parms):  Don't set pretend_args_size if 
REG_PARM_STACK_SPACE.
		  function.h (struct function):  Clarify behavior of 
pretend_args_size.
		  config/rs6000/rs6000.c (setup_incoming_varargs):  Don't set 
pretend_args_size.


Index: function.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/function.c,v
retrieving revision 1.390
diff -u -d -b -w -c -3 -p -r1.390 function.c
cvs server: conflicting specifications of output style
*** function.c  16 Dec 2002 18:19:29 -0000      1.390
--- function.c  7 Jan 2003 01:38:30 -0000
*************** assign_parms (fndecl)
*** 4477,4482 ****
--- 4477,4488 ----

          if (nregs > 0)
            {
+ #if defined (REG_PARM_STACK_SPACE) && !defined 
(MAYBE_REG_PARM_STACK_SPACE)
+             /* When REG_PARM_STACK_SPACE is nonzero, stack space for
+                split parameters was allocated by our caller, so we
+                won't be pushing it in the prolog.  */
+             if (REG_PARM_STACK_SPACE (fndecl) == 0)
+ #endif
              current_function_pretend_args_size
                = (((nregs * UNITS_PER_WORD) + (PARM_BOUNDARY / 
BITS_PER_UNIT) - 1)
                   / (PARM_BOUNDARY / BITS_PER_UNIT)
Index: function.h
===================================================================
RCS file: /cvs/gcc/gcc/gcc/function.h,v
retrieving revision 1.90
diff -u -d -b -w -c -3 -p -r1.90 function.h
cvs server: conflicting specifications of output style
*** function.h  16 Dec 2002 18:19:29 -0000      1.90
--- function.h  7 Jan 2003 01:38:30 -0000
*************** struct function GTY(())
*** 207,213 ****

    /* # bytes the prologue should push and pretend that the caller 
pushed them.
       The prologue must do this, but only if parms can be passed in
!      registers.  */
    int pretend_args_size;

    /* # of bytes of outgoing arguments.  If ACCUMULATE_OUTGOING_ARGS is
--- 207,213 ----

    /* # bytes the prologue should push and pretend that the caller 
pushed them.
       The prologue must do this, but only if parms can be passed in
!      registers, and not when REG_PARM_STACK_SPACE is nonzero.  */
    int pretend_args_size;

    /* # of bytes of outgoing arguments.  If ACCUMULATE_OUTGOING_ARGS is
Index: config/rs6000/rs6000.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/rs6000/rs6000.c,v
retrieving revision 1.407
diff -u -d -b -w -c -3 -p -r1.407 rs6000.c
cvs server: conflicting specifications of output style
*** config/rs6000/rs6000.c      3 Jan 2003 23:09:33 -0000       1.407
--- config/rs6000/rs6000.c      7 Jan 2003 01:38:31 -0000
*************** setup_incoming_varargs (cum, mode, type,
*** 3325,3331 ****
       CUMULATIVE_ARGS *cum;
       enum machine_mode mode;
       tree type;
!      int *pretend_size;
       int no_rtl;

  {
--- 3325,3331 ----
       CUMULATIVE_ARGS *cum;
       enum machine_mode mode;
       tree type;
!      int *pretend_size ATTRIBUTE_UNUSED;
       int no_rtl;

  {
*************** setup_incoming_varargs (cum, mode, type,
*** 3380,3388 ****
        (GP_ARG_MIN_REG + first_reg_offset, mem,
         GP_ARG_NUM_REG - first_reg_offset,
         (GP_ARG_NUM_REG - first_reg_offset) * UNITS_PER_WORD);
-
-       /* ??? Does ABI_V4 need this at all?  */
-       *pretend_size = (GP_ARG_NUM_REG - first_reg_offset) * 
UNITS_PER_WORD;
      }

    /* Save FP registers if needed.  */
--- 3380,3385 ----