lto-symtab.c (lto_symtab_prevailing_decl): Remove redundant test, do not replace…

lto-symtab.c (lto_symtab_prevailing_decl): Remove redundant test, do not replace a non-builtin with a builtin.

2015-08-31  Richard Biener  <rguenther@suse.de>

	lto/
	* lto-symtab.c (lto_symtab_prevailing_decl): Remove redundant
	test, do not replace a non-builtin with a builtin.
	* lto.c (compare_tree_sccs_1): Do not merge things we stream
	as builtins vs. non-builtins.

From-SVN: r227339

gcc/lto/ChangeLog

+2015-08-31  Richard Biener  <rguenther@suse.de>
+
+	* lto-symtab.c (lto_symtab_prevailing_decl): Remove redundant
+	test, do not replace a non-builtin with a builtin.
+	* lto.c (compare_tree_sccs_1): Do not merge things we stream
+	as builtins vs. non-builtins.
+
 2015-08-18  Trevor Saunders  <tbsaunde@tbsaunde.org>
 
 	* lto.h: Remove useless typedefs.

gcc/lto/lto-symtab.c

@@ -798,11 +798,6 @@ lto_symtab_prevailing_decl (tree decl)
   if (TREE_CODE (decl) == FUNCTION_DECL && DECL_ABSTRACT_P (decl))
     return decl;
 
-  /* Likewise builtins are their own prevailing decl.  This preserves
-     non-builtin vs. builtin uses from compile-time.  */
-  if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
-    return decl;
-
   /* Ensure DECL_ASSEMBLER_NAME will not set assembler name.  */
   gcc_assert (DECL_ASSEMBLER_NAME_SET_P (decl));
 
@@ -811,5 +806,9 @@ lto_symtab_prevailing_decl (tree decl)
   if (!ret)
     return decl;
 
+  /* Do not replace a non-builtin with a builtin.  */
+  if (is_builtin_fn (ret->decl))
+    return decl;
+
   return ret->decl;
 }

gcc/lto/lto.c

@@ -1054,8 +1054,10 @@ compare_tree_sccs_1 (tree t1, tree t2, tree **map)
       return false;
 
 
-  /* We don't want to compare locations, so there is nothing do compare
-     for TS_DECL_MINIMAL.  */
+  /* We want to compare locations up to the point where it makes
+     a difference for streaming - thus whether the decl is builtin or not.  */
+  if (CODE_CONTAINS_STRUCT (code, TS_DECL_MINIMAL))
+    compare_values (streamer_handle_as_builtin_p);
 
   if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
     {