alias.c (alias_set_entry_d): Add is_pointer and has_pointer.

	* alias.c (alias_set_entry_d): Add is_pointer and has_pointer.
	(alias_stats): Add num_universal.
	(alias_set_subset_of): Special case pointers; be ready for NULL
	children.
	(alias_sets_conflict_p): Special case pointers; be ready for NULL
	children.
	(init_alias_set_entry): Break out from ...
	(record_alias_subset): ... here; propagate new fields;
	allocate children only when really needed.
	(get_alias_set): Do less generous pointer globbing.
	(dump_alias_stats_in_alias_c): Update statistics.
	* gcc.dg/alias-8.c: Do not xfail.
	* gcc.dg/pr62167.c: Prevent FRE.
	* gcc.dg/alias-14.c: New testcase.

From-SVN: r223883

gcc/ChangeLog

+2015-05-30  Jan Hubicka  <hubicka@ucw.cz>
+
+	* alias.c (alias_set_entry_d): Add is_pointer and has_pointer.
+	(alias_stats): Add num_universal.
+	(alias_set_subset_of): Special case pointers; be ready for NULL
+	children.
+	(alias_sets_conflict_p): Special case pointers; be ready for NULL
+	children.
+	(init_alias_set_entry): Break out from ...
+	(record_alias_subset): ... here; propagate new fields;
+	allocate children only when really needed.
+	(get_alias_set): Do less generous pointer globbing.
+	(dump_alias_stats_in_alias_c): Update statistics.
+
 2015-05-30  Alan Modra  <amodra@gmail.com>
 
 	* config/rs6000/rs6000.c (split_stack_arg_pointer_used_p): Scan

gcc/testsuite/ChangeLog

+2015-05-30  Jan Hubicka  <hubicka@ucw.cz>
+
+	* gcc.dg/alias-8.c: Do not xfail.
+	* gcc.dg/pr62167.c: Prevent FRE.
+	* gcc.dg/alias-14.c: New testcase.
+
 2015-05-29  Christophe Lyon  <christophe.lyon@linaro.org>
 
 	* gcc.target/arm/simd/vextp64_1.c: Close comment on final line.

gcc/testsuite/gcc.dg/alias-14.c

+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+#include <stddef.h>
+void *a;
+int *b;
+struct c {void * a;} c;
+struct d {short * a;} d;
+
+int *ip= (int *)(size_t)2;
+int **ipp = &ip;
+
+int
+main()
+{
+  float **ptr;
+  void **uptr;
+  int* const* cipp = (int* const*)ipp;
+  /* as an extension we consider void * universal. Writes to it should alias.  */
+  asm ("":"=r"(ptr):"0"(&a));
+  a=NULL;
+  *ptr=(float*)(size_t)1;
+  if (!a)
+    __builtin_abort ();
+  a=NULL;
+  if (*ptr)
+    __builtin_abort ();
+
+  asm ("":"=r"(uptr):"0"(&b));
+  b=NULL;
+  *uptr=(void*)(size_t)1;
+  if (!b)
+    __builtin_abort ();
+  b=NULL;
+  if (*uptr)
+    __builtin_abort ();
+
+  /* Check that we disambiguate int * and char *.  */
+  asm ("":"=r"(ptr):"0"(&b));
+  b=NULL;
+  *ptr=(float*)(size_t)1;
+  if (b)
+    __builtin_abort ();
+
+  /* Again we should make void * in the structure conflict with any pointer.  */
+  asm ("":"=r"(ptr):"0"(&c));
+  c.a=NULL;
+  *ptr=(float*)(size_t)1;
+  if (!c.a)
+    __builtin_abort ();
+  c.a=NULL;
+  if (*ptr)
+    __builtin_abort ();
+
+  asm ("":"=r"(uptr):"0"(&d));
+  d.a=NULL;
+  *uptr=(void*)(size_t)1;
+  if (!d.a)
+    __builtin_abort ();
+  d.a=NULL;
+  if (*uptr)
+    __builtin_abort ();
+
+  if ((void *)*cipp != (void*)(size_t)2)
+    __builtin_abort ();
+  *ipp = NULL;
+  if (*cipp)
+    __builtin_abort ();
+
+  return 0;
+}

gcc/testsuite/gcc.dg/alias-8.c

@@ -8,5 +8,5 @@ struct s {
 void
 func(struct s *ptr)
 {
-  *(void **)&ptr->p = 0; /* { dg-warning "type-punned pointer" "" { xfail *-*-* } } */
+  *(void **)&ptr->p = 0; /* { dg-warning "type-punned pointer" "" { } } */
 }

gcc/testsuite/gcc.dg/pr62167.c

@@ -29,6 +29,8 @@ main ()
 
   node.prev = (void *)head;
 
+  asm("":"=m"(node.prev));
+
   head->first = &node;
 
   struct node *n = head->first;