re PR middle-end/27302 (Fold does not fold (i < j) == (j > i) to 1)

2007-02-06  Richard Guenther  <rguenther@suse.de>

        PR middle-end/27302
        * gcc.dg/torture/pr27302-2.c: New testcase.

From-SVN: r121644

gcc/testsuite/ChangeLog

+2007-02-06  Richard Guenther  <rguenther@suse.de>
+
+	PR middle-end/27302
+	* gcc.dg/torture/pr27302-2.c: New testcase.
+
 2007-02-06  Dorit Nuzman  <dorit@il.ibm.com>
 
 	* gcc.dg/vect/vect.exp: Add support for -fno-tree-scev-cprop tests.

gcc/testsuite/gcc.dg/torture/pr27302-2.c

+/* { dg-do run } */
+/* { dg-options "-fstrict-overflow" } */
+
+extern void link_error (void);
+
+void test0 (int a, int b)
+{
+  if ((a < b) != (b > a))
+    link_error ();
+
+  if ((a - 1 < b) != (a <= b))
+    link_error ();
+  if ((a - 2 < b) != (a - 1 <= b))
+    link_error ();
+  if ((a + -1 < b) != (a <= b))
+    link_error ();
+  if ((a + -2 < b) != (a + -1 <= b))
+    link_error ();
+
+  if ((a + 1 > b) != (a >= b))
+    link_error ();
+  if ((a + 2 > b) != (a + 1 >= b))
+    link_error ();
+  if ((a - -1 > b) != (a >= b))
+    link_error ();
+  if ((a - -2 > b) != (a - -1 >= b))
+    link_error ();
+
+  if ((a + 1 <= b) != (a < b))
+    link_error ();
+  if ((a + 2 <= b) != (a + 1 < b))
+    link_error ();
+  if ((a - -1 <= b) != (a < b))
+    link_error ();
+  if ((a - -2 <= b) != (a - -1 < b))
+    link_error ();
+
+  if ((a - 1 >= b) != (a > b))
+    link_error ();
+  if ((a - 2 >= b) != (a - 1 > b))
+    link_error ();
+  if ((a + -1 >= b) != (a > b))
+    link_error ();
+  if ((a + -2 >= b) != (a + -1 > b))
+    link_error ();
+}
+
+int main()
+{
+  test0 (1, 2);
+  return 0;
+}