* tree-ssanames.c (set_range_info_raw): Abstract from ...

	(set_range_info): ...here.  Only call set_range_info_raw if domain
	is useful.
	(set_nonzero_bits): Call set_range_info_raw.
	* tree-ssanames.h (set_range_info_raw): New.
testsuite/
	* gcc.dg/Walloca-14.c: Adapt test to recognize new complaint of
	unbounded use.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@249846 138bc75d-0d04-0410-961f-82ee72b054a4

5 files changed, 58 insertions, 6 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index be0b4bc98de..2fbfc2bebc2 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+2017-06-30  Aldy Hernandez  <aldyh@redhat.com>
+
+	* tree-ssanames.c (set_range_info_raw): Abstract from ...
+	(set_range_info): ...here.  Only call set_range_info_raw if domain
+	is useful.
+	(set_nonzero_bits): Call set_range_info_raw.
+	* tree-ssanames.h (set_range_info_raw): New.
+
 2017-06-30  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/81225
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index f0555b991aa..92d5f63ae2f 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2017-06-30  Aldy Hernandez  <aldyh@redhat.com>
+
+	* gcc.dg/Walloca-14.c: Adapt test to recognize new complaint of
+	unbounded use.
+
 2017-06-30  David Malcolm  <dmalcolm@redhat.com>
 
 	PR c++/80014
diff --git a/gcc/testsuite/gcc.dg/Walloca-14.c b/gcc/testsuite/gcc.dg/Walloca-14.c
index 723dbe5081a..f3e3f579439 100644
--- a/gcc/testsuite/gcc.dg/Walloca-14.c
+++ b/gcc/testsuite/gcc.dg/Walloca-14.c
@@ -9,5 +9,6 @@ g (int *p)
   extern void f (void *);
 
   void *q = __builtin_alloca (p); /* { dg-warning "passing argument 1" } */
+  /* { dg-warning "unbounded use of 'alloca'" "unbounded" { target *-*-* } 11 } */
   f (q);
 }
diff --git a/gcc/tree-ssanames.c b/gcc/tree-ssanames.c
index e83dd469846..676c806c622 100644
--- a/gcc/tree-ssanames.c
+++ b/gcc/tree-ssanames.c
@@ -320,11 +320,14 @@ make_ssa_name_fn (struct function *fn, tree var, gimple *stmt,
   return t;
 }
 
-/* Store range information RANGE_TYPE, MIN, and MAX to tree ssa_name NAME.  */
+/* Helper function for set_range_info.
+
+   Store range information RANGE_TYPE, MIN, and MAX to tree ssa_name
+   NAME.  */
 
 void
-set_range_info (tree name, enum value_range_type range_type,
-		const wide_int_ref &min, const wide_int_ref &max)
+set_range_info_raw (tree name, enum value_range_type range_type,
+		    const wide_int_ref &min, const wide_int_ref &max)
 {
   gcc_assert (!POINTER_TYPE_P (TREE_TYPE (name)));
   gcc_assert (range_type == VR_RANGE || range_type == VR_ANTI_RANGE);
@@ -360,6 +363,34 @@ set_range_info (tree name, enum value_range_type range_type,
     }
 }
 
+/* Store range information RANGE_TYPE, MIN, and MAX to tree ssa_name
+   NAME while making sure we don't store useless range info.  */
+
+void
+set_range_info (tree name, enum value_range_type range_type,
+		const wide_int_ref &min, const wide_int_ref &max)
+{
+  gcc_assert (!POINTER_TYPE_P (TREE_TYPE (name)));
+
+  /* A range of the entire domain is really no range at all.  */
+  tree type = TREE_TYPE (name);
+  if (min == wi::min_value (TYPE_PRECISION (type), TYPE_SIGN (type))
+      && max == wi::max_value (TYPE_PRECISION (type), TYPE_SIGN (type)))
+    {
+      range_info_def *ri = SSA_NAME_RANGE_INFO (name);
+      if (ri == NULL)
+	return;
+      if (ri->get_nonzero_bits () == -1)
+	{
+	  ggc_free (ri);
+	  SSA_NAME_RANGE_INFO (name) = NULL;
+	  return;
+	}
+    }
+
+  set_range_info_raw (name, range_type, min, max);
+}
+
 
 /* Gets range information MIN, MAX and returns enum value_range_type
    corresponding to tree ssa_name NAME.  enum value_range_type returned
@@ -419,9 +450,13 @@ set_nonzero_bits (tree name, const wide_int_ref &mask)
 {
   gcc_assert (!POINTER_TYPE_P (TREE_TYPE (name)));
   if (SSA_NAME_RANGE_INFO (name) == NULL)
-    set_range_info (name, VR_RANGE,
-		    TYPE_MIN_VALUE (TREE_TYPE (name)),
-		    TYPE_MAX_VALUE (TREE_TYPE (name)));
+    {
+      if (mask == -1)
+	return;
+      set_range_info_raw (name, VR_RANGE,
+			  TYPE_MIN_VALUE (TREE_TYPE (name)),
+			  TYPE_MAX_VALUE (TREE_TYPE (name)));
+    }
   range_info_def *ri = SSA_NAME_RANGE_INFO (name);
   ri->set_nonzero_bits (mask);
 }
diff --git a/gcc/tree-ssanames.h b/gcc/tree-ssanames.h
index 9a18394f5a8..f7e032fe11d 100644
--- a/gcc/tree-ssanames.h
+++ b/gcc/tree-ssanames.h
@@ -69,6 +69,9 @@ struct GTY ((variable_size)) range_info_def {
 /* Sets the value range to SSA.  */
 extern void set_range_info (tree, enum value_range_type, const wide_int_ref &,
 			    const wide_int_ref &);
+extern void set_range_info_raw (tree, enum value_range_type,
+				const wide_int_ref &,
+				const wide_int_ref &);
 /* Gets the value range from SSA.  */
 extern enum value_range_type get_range_info (const_tree, wide_int *,
 					     wide_int *);