toplev.c (rest_of_compilation): Don't call save_for_inline_copy if all we're…

toplev.c (rest_of_compilation): Don't call save_for_inline_copy if all we're doing is dealing with -Wreturn-type.

        * toplev.c (rest_of_compilation): Don't call save_for_inline_copy
        if all we're doing is dealing with -Wreturn-type.

From-SVN: r17104

gcc/ChangeLog

+Mon Dec 15  Mark Mitchell  <mmitchell@usa.net> 11:41:32 1997
+
+	* toplev.c (rest_of_compilation): Don't call save_for_inline_copy
+	if all we're doing is dealing with -Wreturn-type.
+
 Mon Dec 15 09:44:39 1997  Richard Henderson  <rth@cygnus.com>
 
 	* alpha.md (zero_extendqihi2, zero_extendqisi2, zero_extendqidi2):

gcc/toplev.c

@@ -3120,9 +3120,23 @@ rest_of_compilation (decl)
 	{
 	  DECL_DEFER_OUTPUT (decl) = 1;
 
-	  /* If -Wreturn-type, we have to do a bit of compilation.  */
-	  if (! warn_return_type)
-	    {
+	  /* If -Wreturn-type, we have to do a bit of compilation.
+	     However, if we just fall through we will call
+	     save_for_inline_copying() which results in excessive
+	     memory use.  Instead, we just want to call
+	     jump_optimize() to figure out whether or not we can fall
+	     off the end of the function; we do the minimum amount of
+	     work necessary to make that safe.  And, we set optimize
+	     to zero to keep jump_optimize from working too hard.  */
+	  if (warn_return_type)
+	    {
+	      int saved_optimize = optimize;
+	      optimize = 0;
+	      find_exception_handler_labels ();
+	      jump_optimize (get_insns(), 0, 0, 0);
+	      optimize = saved_optimize;
+	    }
+
 #ifdef DWARF_DEBUGGING_INFO
 	  /* Generate the DWARF info for the "abstract" instance
 	     of a function which we may later generate inlined and/or
@@ -3149,7 +3163,6 @@ rest_of_compilation (decl)
 	  RTX_INTEGRATED_P (DECL_SAVED_INSNS (decl)) = inlinable;
 	  goto exit_rest_of_compilation;
 	}
-	}
 
       /* If we have to compile the function now, save its rtl and subdecls
 	 so that its compilation will not affect what others get.  */