ADDR_EXPR and nonnull

gcc/ChangeLog:

2016-10-21  Kugan Vivekanandarajah  <kuganv@linaro.org>

	* ipa-prop.c (ipa_compute_jump_functions_for_edge): Create nonzero
	value range for pointers in more cases.

gcc/testsuite/ChangeLog:

2016-10-21  Kugan Vivekanandarajah  <kuganv@linaro.org>

	* gcc.dg/ipa/vrp5.c: New test.
	* gcc.dg/ipa/vrp6.c: New test.




git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@241428 138bc75d-0d04-0410-961f-82ee72b054a4

gcc/ChangeLog

@@ -1,3 +1,8 @@
+2016-10-21  Kugan Vivekanandarajah  <kuganv@linaro.org>
+
+	* ipa-prop.c (ipa_compute_jump_functions_for_edge): Create nonzero
+	value range for pointers in more cases.
+
 2016-10-21  Wilco Dijkstra  <wdijkstr@arm.com>
 
 	* config/aarch64/aarch64.c (aarch64_add_constant_internal):

gcc/ipa-prop.c

@@ -1670,9 +1670,17 @@ ipa_compute_jump_functions_for_edge (struct ipa_func_body_info *fbi,
 
       if (POINTER_TYPE_P (TREE_TYPE (arg)))
 	{
+	  bool addr_nonzero = false;
+	  bool strict_overflow = false;
+
 	  if (TREE_CODE (arg) == SSA_NAME
 	      && param_type
 	      && get_ptr_nonnull (arg))
+	    addr_nonzero = true;
+	  else if (tree_single_nonzero_warnv_p (arg, &strict_overflow))
+	    addr_nonzero = true;
+
+	  if (addr_nonzero)
 	    {
 	      jfunc->vr_known = true;
 	      jfunc->m_vr.type = VR_ANTI_RANGE;

gcc/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2016-10-21  Kugan Vivekanandarajah  <kuganv@linaro.org>
+
+	* gcc.dg/ipa/vrp5.c: New test.
+	* gcc.dg/ipa/vrp6.c: New test.
+
 2016-10-21  Wilco Dijkstra  <wdijkstr@arm.com>
 
 	* gcc.target/aarch64/test_frame_17.c: New test.

gcc/testsuite/gcc.dg/ipa/vrp5.c

@@ -0,0 +1,34 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-ipa-cp-details -fdump-tree-vrp1" } */
+
+static __attribute__((noinline, noclone))
+int foo (int *p)
+{
+  if (!p)
+    return 0;
+  *p = 1;
+}
+
+struct st
+{
+  int a;
+  int b;
+};
+
+int arr1[10];
+int a;
+int bar (struct st *s)
+{
+  int arr2[10];
+  int b;
+  if (!s)
+    return 0;
+  foo (&s->a);
+  foo (&a);
+  foo (&b);
+  foo (&arr1[1]);
+  foo (&arr2[1]);
+}
+
+/* { dg-final { scan-ipa-dump "Setting nonnull for 0" "cp" } } */
+/* { dg-final { scan-tree-dump-times "if" 1 "vrp1" } } */

gcc/testsuite/gcc.dg/ipa/vrp6.c

@@ -0,0 +1,34 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-ipa-cp-details -fdump-tree-vrp1" } */
+
+static __attribute__((noinline, noclone))
+int foo (int *p)
+{
+  if (!p)
+    return 0;
+  *p = 1;
+}
+
+struct st
+{
+  int a;
+  int b;
+};
+
+struct st s2;
+int a;
+int bar (struct st *s)
+{
+  struct st s3;
+  int b;
+  if (!s)
+    return 0;
+  foo (&s->a);
+  foo (&s2.a);
+  foo (&s3.a);
+  foo (&a);
+  foo (&b);
+}
+
+/* { dg-final { scan-ipa-dump "Setting nonnull for 0" "cp" } } */
+/* { dg-final { scan-tree-dump-times "if" 1 "vrp1" } } */