re PR tree-optimization/53058 (Another ice in remove_range_assertions)

	PR tree-optimization/53058
	* double-int.h (double_int_max_value, double_int_min_value): New
	prototypes.
	* double-int.c (double_int_max_value, double_int_min_value): New
	functions.
	* tree-vrp.c (register_edge_assert_for_2): Compare mask
	for LE_EXPR or GT_EXPR with double_int_max_value
	instead of double_int_mask.

	* gcc.c-torture/compile/pr53058.c: New test.

From-SVN: r186816

gcc/ChangeLog

+2012-04-25  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/53058
+	* double-int.h (double_int_max_value, double_int_min_value): New
+	prototypes.
+	* double-int.c (double_int_max_value, double_int_min_value): New
+	functions.
+	* tree-vrp.c (register_edge_assert_for_2): Compare mask
+	for LE_EXPR or GT_EXPR with double_int_max_value
+	instead of double_int_mask.
+
 2012-04-25  Richard Guenther  <rguenther@suse.de>
 
 	* tree-vectorizer.h (vect_loop_versioning): Adjust prototype.

gcc/double-int.c

 /* Operations with long integers.
-   Copyright (C) 2006, 2007, 2009, 2010 Free Software Foundation, Inc.
+   Copyright (C) 2006, 2007, 2009, 2010, 2012 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -616,6 +616,26 @@ double_int_mask (unsigned prec)
   return mask;
 }
 
+/* Returns a maximum value for signed or unsigned integer
+   of precision PREC.  */
+
+double_int
+double_int_max_value (unsigned int prec, bool uns)
+{
+  return double_int_mask (prec - (uns ? 0 : 1));
+}
+
+/* Returns a minimum value for signed or unsigned integer
+   of precision PREC.  */
+
+double_int
+double_int_min_value (unsigned int prec, bool uns)
+{
+  if (uns)
+    return double_int_zero;
+  return double_int_lshift (double_int_one, prec - 1, prec, false);
+}
+
 /* Clears the bits of CST over the precision PREC.  If UNS is false, the bits
    outside of the precision are set to the sign bit (i.e., the PREC-th one),
    otherwise they are set to zero.

gcc/double-int.h

 /* Operations with long integers.
-   Copyright (C) 2006, 2007, 2008, 2010 Free Software Foundation, Inc.
+   Copyright (C) 2006, 2007, 2008, 2010, 2012 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -242,6 +242,9 @@ double_int double_int_sext (double_int, unsigned);
 double_int double_int_zext (double_int, unsigned);
 double_int double_int_mask (unsigned);
 
+double_int double_int_max_value (unsigned int, bool);
+double_int double_int_min_value (unsigned int, bool);
+
 #define ALL_ONES (~((unsigned HOST_WIDE_INT) 0))
 
 /* The operands of the following comparison functions must be processed

gcc/testsuite/ChangeLog

+2012-04-25  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/53058
+	* gcc.c-torture/compile/pr53058.c: New test.
+
 2012-04-25  Jan Hubicka  <jh@suse.cz>
 
 	PR middle-end/53088

gcc/testsuite/gcc.c-torture/compile/pr53058.c

+/* PR tree-optimization/53058 */
+
+int a, b, c;
+
+void
+foo ()
+{
+  c = b >> 16;
+  if (c > 32767)
+    c = 0;
+  a = b;
+}

gcc/tree-vrp.c

@@ -4565,6 +4565,7 @@ register_edge_assert_for_2 (tree name, edge e, gimple_stmt_iterator bsi,
 	      && INTEGRAL_TYPE_P (TREE_TYPE (name2))
 	      && IN_RANGE (tree_low_cst (cst2, 1), 1, prec - 1)
 	      && prec <= 2 * HOST_BITS_PER_WIDE_INT
+	      && prec == GET_MODE_PRECISION (TYPE_MODE (TREE_TYPE (val)))
 	      && live_on_edge (e, name2)
 	      && !has_single_use (name2))
 	    {
@@ -4598,8 +4599,10 @@ register_edge_assert_for_2 (tree name, edge e, gimple_stmt_iterator bsi,
 	    new_val = val2;
 	  else
 	    {
+	      double_int maxval
+		= double_int_max_value (prec, TYPE_UNSIGNED (TREE_TYPE (val)));
 	      mask = double_int_ior (tree_to_double_int (val2), mask);
-	      if (double_int_minus_one_p (double_int_sext (mask, prec)))
+	      if (double_int_equal_p (mask, maxval))
 		new_val = NULL_TREE;
 	      else
 		new_val = double_int_to_tree (TREE_TYPE (val2), mask);