tree.h (set_decl_incoming_rtl): Add a by_reference_p parameter.

gcc/
	* tree.h (set_decl_incoming_rtl): Add a by_reference_p parameter.
	* emit-rtl.c (set_decl_incoming_rtl): Likewise.  Don't set the
	rtl's register attributes when the parameter is true.
	* function.c (assign_parms_unsplit_complex, assign_parms)
	(expand_function_start): Update calls to set_decl_incoming_rtl.

From-SVN: r131056

gcc/ChangeLog

 2007-12-19  Richard Sandiford  <rsandifo@nildram.co.uk>
 
+	* tree.h (set_decl_incoming_rtl): Add a by_reference_p parameter.
+	* emit-rtl.c (set_decl_incoming_rtl): Likewise.  Don't set the
+	rtl's register attributes when the parameter is true.
+	* function.c (assign_parms_unsplit_complex, assign_parms)
+	(expand_function_start): Update calls to set_decl_incoming_rtl.
+
+2007-12-19  Richard Sandiford  <rsandifo@nildram.co.uk>
+
 	* rtl.def (SUBREG): Update comments.
 	* rtl.h (reg_attrs): Be explicit about the type of offset used.
 	(set_reg_attrs_from_mem): Rename to...

gcc/emit-rtl.c

@@ -1045,13 +1045,14 @@ set_decl_rtl (tree t, rtx x)
     set_reg_attrs_for_decl_rtl (t, x);
 }
 
-/* Assign the RTX X to parameter declaration T.  */
+/* Assign the RTX X to parameter declaration T.  BY_REFERENCE_P is true
+   if the ABI requires the parameter to be passed by reference.  */
 
 void
-set_decl_incoming_rtl (tree t, rtx x)
+set_decl_incoming_rtl (tree t, rtx x, bool by_reference_p)
 {
   DECL_INCOMING_RTL (t) = x;
-  if (x)
+  if (x && !by_reference_p)
     set_reg_attrs_for_decl_rtl (t, x);
 }
 

gcc/function.c

@@ -2973,13 +2973,13 @@ assign_parms_unsplit_complex (struct assign_parm_data_all *all, tree fnargs)
 	      imag = gen_lowpart_SUBREG (inner, imag);
 	    }
 	  tmp = gen_rtx_CONCAT (DECL_MODE (parm), real, imag);
-	  set_decl_incoming_rtl (parm, tmp);
+	  set_decl_incoming_rtl (parm, tmp, false);
 	  fnargs = TREE_CHAIN (fnargs);
 	}
       else
 	{
 	  SET_DECL_RTL (parm, DECL_RTL (fnargs));
-	  set_decl_incoming_rtl (parm, DECL_INCOMING_RTL (fnargs));
+	  set_decl_incoming_rtl (parm, DECL_INCOMING_RTL (fnargs), false);
 
 	  /* Set MEM_EXPR to the original decl, i.e. to PARM,
 	     instead of the copy of decl, i.e. FNARGS.  */
@@ -3035,7 +3035,7 @@ assign_parms (tree fndecl)
 	}
 
       /* Record permanently how this parm was passed.  */
-      set_decl_incoming_rtl (parm, data.entry_parm);
+      set_decl_incoming_rtl (parm, data.entry_parm, data.passed_pointer);
 
       /* Update info on where next arg arrives in registers.  */
       FUNCTION_ARG_ADVANCE (all.args_so_far, data.promoted_mode,
@@ -4259,7 +4259,7 @@ expand_function_start (tree subr)
       tree parm = cfun->static_chain_decl;
       rtx local = gen_reg_rtx (Pmode);
 
-      set_decl_incoming_rtl (parm, static_chain_incoming_rtx);
+      set_decl_incoming_rtl (parm, static_chain_incoming_rtx, false);
       SET_DECL_RTL (parm, local);
       mark_reg_pointer (local, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (parm))));
 

gcc/tree.h

@@ -5135,7 +5135,7 @@ extern tree walk_tree_without_duplicates_1 (tree*, walk_tree_fn, void*,
 /* Assign the RTX to declaration.  */
 
 extern void set_decl_rtl (tree, rtx);
-extern void set_decl_incoming_rtl (tree, rtx);
+extern void set_decl_incoming_rtl (tree, rtx, bool);
 
 /* Enum and arrays used for tree allocation stats.
    Keep in sync with tree.c:tree_node_kind_names.  */