re PR tree-optimization/34148 (Too many VOPs, too deep tree-ssa-sccvn.c recursion)

2007-11-21  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/34148
	* tree-ssa-structalias.c (create_variable_info_for): Do not use
	field-sensitive PTA for single-element structures.
	* tree-ssa-alias.c (create_overlap_variables_for): Do not create
	SFTs for single-element structures.

From-SVN: r130329

gcc/ChangeLog

+2007-11-21  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/34148
+	* tree-ssa-structalias.c (create_variable_info_for): Do not use
+	field-sensitive PTA for single-element structures.
+	* tree-ssa-alias.c (create_overlap_variables_for): Do not create
+	SFTs for single-element structures.
+
 2007-11-20  Richard Guenther  <rguenther@suse.de>
 
 	PR middle-end/34154

gcc/tree-ssa-alias.c

@@ -3837,7 +3837,7 @@ create_overlap_variables_for (tree var)
 			       TREE_TYPE (var));
   /* Make sure to not create SFTs for structs we won't generate variable
      infos for.  See tree-ssa-structalias.c:create_variable_info_for ().  */
-  if (VEC_length (fieldoff_s, fieldstack) != 0
+  if (VEC_length (fieldoff_s, fieldstack) > 1
       && VEC_length (fieldoff_s, fieldstack) <= MAX_FIELDS_FOR_FIELD_SENSITIVE)
     {
       subvar_t *subvars;

gcc/tree-ssa-structalias.c

@@ -4441,6 +4441,7 @@ create_variable_info_for (tree decl, const char *name)
       && !notokay
       && !vi->is_unknown_size_var
       && var_can_have_subvars (decl)
+      && VEC_length (fieldoff_s, fieldstack) > 1
       && VEC_length (fieldoff_s, fieldstack) <= MAX_FIELDS_FOR_FIELD_SENSITIVE)
     {
       unsigned int newindex = VEC_length (varinfo_t, varmap);