re PR tree-optimization/35787 (Revision 133680 breaks 447.dealII)

2008-04-02  Richard Guenther  <rguenther@suse.de>

	* tree-vrp.c (extract_range_from_assert): Make sure to not
	produce range min/max with TREE_OVERFOW set.
	If merging a anti-range and a range keep the anti-range if
	the range covers all values of the type.
	(register_edge_assert_for_2): Only allow sign-changing
	conversions in detecting canonical range checks.  Also
	register an assert for the unsigned name if useful.

	PR tree-optimization/35787
	* tree-vrp.c (vrp_val_max): New function.
	(vrp_val_min): Likewise.
	(vrp_val_is_max): Move earlier, use vrp_val_{min,max}.
	(vrp_val_is_min): Likewise.
	(supports_overflow_infinity): Use vrp_val_{min,max}.
	(negative_overflow_infinity): Likewise.
	(positive_overflow_infinity): Likewise.
	(is_negative_overflow_infinity): Use vrp_val_is_{min,max}.
	(is_positive_overflow_infinity): Likewise.
	(is_overflow_infinity): Likewise.
	(avoid_overflow_infinity): Use vrp_val_{min,max} and
	vrp_val_is_{min,max}.
	(set_and_canonicalize_value_range): Canonicalize anti-ranges
	to ranges if possible.  Avoid empty ranges.

	* gcc.dg/tree-ssa/vrp38.c: New testcase.
	* gcc.dg/tree-ssa/vrp39.c: Likewise.

From-SVN: r133808

gcc/ChangeLog

+2008-04-02  Richard Guenther  <rguenther@suse.de>
+
+	* tree-vrp.c (extract_range_from_assert): Make sure to not
+	produce range min/max with TREE_OVERFOW set.
+	If merging a anti-range and a range keep the anti-range if
+	the range covers all values of the type.
+	(register_edge_assert_for_2): Only allow sign-changing
+	conversions in detecting canonical range checks.  Also
+	register an assert for the unsigned name if useful.
+
+	PR tree-optimization/35787
+	* tree-vrp.c (vrp_val_max): New function.
+	(vrp_val_min): Likewise.
+	(vrp_val_is_max): Move earlier, use vrp_val_{min,max}.
+	(vrp_val_is_min): Likewise.
+	(supports_overflow_infinity): Use vrp_val_{min,max}.
+	(negative_overflow_infinity): Likewise.
+	(positive_overflow_infinity): Likewise.
+	(is_negative_overflow_infinity): Use vrp_val_is_{min,max}.
+	(is_positive_overflow_infinity): Likewise.
+	(is_overflow_infinity): Likewise.
+	(avoid_overflow_infinity): Use vrp_val_{min,max} and
+	vrp_val_is_{min,max}.
+	(set_and_canonicalize_value_range): Canonicalize anti-ranges
+	to ranges if possible.  Avoid empty ranges.
+
 2008-04-01  John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>
 
 	PR middle-end/35705

gcc/testsuite/ChangeLog

+2008-04-02  Richard Guenther  <rguenther@suse.de>
+
+	* gcc.dg/tree-ssa/vrp38.c: New testcase.
+	* gcc.dg/tree-ssa/vrp39.c: Likewise.
+
 2008-04-01  George Helffrich  <george@gcc.gnu.org>
 
 	PRs fortran/PR35154, fortran/PR23057

gcc/testsuite/gcc.dg/tree-ssa/vrp38.c

+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+int __attribute__((noinline))
+foo(char c)
+{
+  unsigned short a = (unsigned short)c;
+  if (a >= -32000 && a <= 32000)
+    return c == 0;
+  return -1;
+}
+
+extern void abort (void);
+
+int main()
+{
+  if (foo(1) == 1)
+    abort ();
+  return 0;
+}
+

gcc/testsuite/gcc.dg/tree-ssa/vrp39.c

+/* { dg-do link } */
+/* { dg-options "-O2" } */
+
+extern void link_error (void);
+
+void test1(int i)
+{
+  if (i >= -5 && i <= 8)
+    {
+      unsigned int j = i;
+      if (j == -6)
+	link_error ();
+      if (j == 9)
+	link_error ();
+    }
+}
+
+int main() { return 0; }