re PR tree-optimization/78699 (ICE (segfault) on powerpc64le-linux-gnu (memory-hog))

2016-12-13  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/78699
	* tree-vect-data-refs.c (vect_analyze_group_access_1): Limit
	group size.

From-SVN: r243599

gcc/ChangeLog

 2016-12-13  Richard Biener  <rguenther@suse.de>
 
+	PR tree-optimization/78699
+	* tree-vect-data-refs.c (vect_analyze_group_access_1): Limit
+	group size.
+
+2016-12-13  Richard Biener  <rguenther@suse.de>
+
 	PR middle-end/78742
 	* tree.c (cst_and_fits_in_hwi): Look if the actual value fits.
 	* tree-object-size.c (compute_builtin_object_size): Use

gcc/tree-vect-data-refs.c

@@ -2390,7 +2390,9 @@ vect_analyze_group_access_1 (struct data_reference *dr)
       if (groupsize == 0)
         groupsize = count + gaps;
 
-      if (groupsize > UINT_MAX)
+      /* This could be UINT_MAX but as we are generating code in a very
+         inefficient way we have to cap earlier.  See PR78699 for example.  */
+      if (groupsize > 4096)
 	{
 	  if (dump_enabled_p ())
 	    dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,