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.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@186816 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 21 insertions, 1 deletions

diff --git a/gcc/double-int.c b/gcc/double-int.c
index d0fde0ed89f..3a51bd35d00 100644
--- a/gcc/double-int.c
+++ b/gcc/double-int.c
@@ -1,5 +1,5 @@
 /* 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.