tree-ssa-alias.c (create_name_tags): Ignore pointers that don't have PT_VARS nor PT_MALLOC set.

* tree-ssa-alias.c (create_name_tags): Ignore pointers that
	don't have PT_VARS nor PT_MALLOC set.
	Clear name tag from pointers that have not been dereferenced.
	(set_pt_anything, set_pt_malloc): Forward declare.
	* tree-ssa-copy.c (may_propagate_copy): Compare alias sets,
	not type compatibility when determining if a pointer can be
	copy propagated.

testsuite/ChangeLog

	* gcc.c-torture/compile/20040727-1.c: New test.

From-SVN: r85220

gcc/ChangeLog

@@ -1,3 +1,13 @@
+2004-07-27  Diego Novillo  <dnovillo@redhat.com>
+
+	* tree-ssa-alias.c (create_name_tags): Ignore pointers that
+	don't have PT_VARS nor PT_MALLOC set.
+	Clear name tag from pointers that have not been dereferenced.
+	(set_pt_anything, set_pt_malloc): Forward declare.
+	* tree-ssa-copy.c (may_propagate_copy): Compare alias sets,
+	not type compatibility when determining if a pointer can be
+	copy propagated.
+
 2004-07-27  Richard Sandiford  <rsandifo@redhat.com>
 
 	* expr.h (canonicalize_condition, get_condition): Add an int argument.

gcc/testsuite/ChangeLog

@@ -1,3 +1,7 @@
+2004-07-27  Diego Novillo  <dnovillo@redhat.com>
+
+	* gcc.c-torture/compile/20040727-1.c: New test.
+
 2004-07-26  Eric Christopher  <echristo@redhat.com>
 
 	* gcc.c-torture/compile/20040726-2.c: New test.

gcc/testsuite/gcc.c-torture/compile/20040727-1.c

@@ -0,0 +1,32 @@
+/* Extracted from boehm-gc/os_dep.c on Darwin.  It caused an ICE when
+   trying to merge alias information from two pointers that had
+   different type memory tags.  */
+typedef int thread_state_flavor_t;
+typedef int exception_behavior_t;
+typedef unsigned int exception_mask_t;
+typedef unsigned int exception_handler_t;
+typedef unsigned int mach_msg_type_number_t;
+static struct {
+   mach_msg_type_number_t count;
+   exception_mask_t masks[16];
+   exception_handler_t ports[16];
+   thread_state_flavor_t flavors[16];
+} GC_old_exc_ports;
+
+typedef exception_handler_t *exception_handler_array_t;
+typedef thread_state_flavor_t *exception_flavor_array_t;
+
+
+int task_get_exception_ports
+(
+  mach_msg_type_number_t *masksCnt,
+  exception_handler_array_t old_handlers,
+  exception_flavor_array_t old_flavors
+);
+
+void GC_dirty_init()
+{
+   task_get_exception_ports(GC_old_exc_ports.masks,
+                           GC_old_exc_ports.ports,
+                           GC_old_exc_ports.flavors);
+}

gcc/tree-ssa-alias.c

@@ -157,6 +157,8 @@ static bool ptr_is_dereferenced_by (tree, tree, bool *);
 static void maybe_create_global_var (struct alias_info *ai);
 static void group_aliases (struct alias_info *);
 static struct ptr_info_def *get_ptr_info (tree t);
+static void set_pt_anything (tree ptr);
+static void set_pt_malloc (tree ptr);
 
 /* Global declarations.  */
 
@@ -773,7 +775,12 @@ create_name_tags (struct alias_info *ai)
       struct ptr_info_def *pi = SSA_NAME_PTR_INFO (ptr);
 
       if (!pi->is_dereferenced)
-	continue;
+	{
+	  /* No name tags for pointers that have not been
+	     dereferenced.  */
+	  pi->name_mem_tag = NULL_TREE;
+	  continue;
+	}
 
       if (pi->pt_vars)
 	{
@@ -828,7 +835,8 @@ create_name_tags (struct alias_info *ai)
 	  /* Only pointers that may point to malloc or other variables
 	     may receive a name tag.  If the pointer does not point to
 	     a known spot, we should use type tags.  */
-	  abort ();
+	  set_pt_anything (ptr);
+	  continue;
 	}
 
       /* Mark the new name tag for renaming.  */

gcc/tree-ssa-copy.c

@@ -112,6 +112,9 @@ may_propagate_copy (tree dest, tree orig)
 	return false;
       else if (!lang_hooks.types_compatible_p (type_d, type_o))
 	return false;
+      else if (!alias_sets_conflict_p (get_alias_set (type_d),
+				       get_alias_set (type_o)))
+	return false;
     }
 
   /* If the destination is a SSA_NAME for a virtual operand, then we have