stack-parm-1.patch

[Doug Evans <devans at cygnus dot com>]

This patch fixes a bug in function.c:assign_parms.

In an `else' we have

      else
	{
	  /* Value must be stored in the stack slot STACK_PARM
	     during function execution.  */

	  if (promoted_mode != nominal_mode)
	    {
	      ... convert entry_parm to nominal_mode ...
	    }

then we have

	  if (entry_parm != stack_parm)
	    {
	      ...

	      if (promoted_mode != nominal_mode)
		{
		  push_to_sequence (conversion_insns);
		  emit_move_insn (validize_mem (stack_parm),
				  validize_mem (entry_parm));

Note that while the mode of entry_parm is converted to nominal_mode,
the mode of stack_parm is not and hence emit_move_insn will abort.

Thu Oct 16 10:37:14 1997  Doug Evans  <dje@canuck.cygnus.com>

	* function.c (assign_parms): Correct mode of stack_parm if
	entry_parm underwent a mode conversion.

*** function.c.orig	Thu Aug 28 11:14:05 1997
--- function.c	Thu Oct 16 10:40:16 1997
*************** assign_parms (fndecl, second_time)
*** 4053,4058 ****
--- 4053,4064 ----
  	      push_to_sequence (conversion_insns);
  	      entry_parm = convert_to_mode (nominal_mode, tempreg,
  					    TREE_UNSIGNED (TREE_TYPE (parm)));
+ 	      if (stack_parm)
+ 		{
+ 		  /* ??? This may need a big-endian conversion on sparc64.  */
+ 		  stack_parm = change_address (stack_parm, nominal_mode,
+ 					       NULL_RTX);
+ 		}
  	      conversion_insns = get_insns ();
  	      did_conversion = 1;
  	      end_sequence ();