re PR tree-optimization/59358 (Infinite loop generated with >=O2)

	PR tree-optimization/59358
	* tree-vrp.c (union_ranges): To check for the partially
	overlapping ranges or adjacent ranges, also compare *vr0max
	with vr1max.

	* gcc.c-torture/execute/pr59358.c: New test.

From-SVN: r205607

gcc/ChangeLog

-2013-12-02 Sterling Augustine  <saugustine@google.com>
+2013-12-02  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/59358
+	* tree-vrp.c (union_ranges): To check for the partially
+	overlapping ranges or adjacent ranges, also compare *vr0max
+	with vr1max.
+
+2013-12-02  Sterling Augustine  <saugustine@google.com>
 
 	* dwarf2out.c (output_pubnames): Use comp_unit_die ()->die_offset
 	when there isn't a skeleton die.

gcc/testsuite/ChangeLog

 2013-12-02  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/59358
+	* gcc.c-torture/execute/pr59358.c: New test.
+
 	PR lto/59326
 	* gcc.target/i386/i386.exp (check_effective_target_avx2): Move to...
 	* lib/target-supports.exp (check_effective_target_avx2): ... here.

gcc/testsuite/gcc.c-torture/execute/pr59358.c

+/* PR tree-optimization/59358 */
+
+__attribute__((noinline, noclone)) int
+foo (int *x, int y)
+{
+  int z = *x;
+  if (y > z && y <= 16)
+    while (y > z)
+      z *= 2;
+  return z;
+}
+
+int
+main ()
+{
+  int i;
+  for (i = 1; i < 17; i++)
+    {
+      int j = foo (&i, 16);
+      int k;
+      if (i >= 8 && i <= 15)
+	k = 16 + (i - 8) * 2;
+      else if (i >= 4 && i <= 7)
+	k = 16 + (i - 4) * 4;
+      else if (i == 3)
+	k = 24;
+      else
+	k = 16;
+      if (j != k)
+	__builtin_abort ();
+      j = foo (&i, 7);
+      if (i >= 7)
+	k = i;
+      else if (i >= 4)
+	k = 8 + (i - 4) * 2;
+      else if (i == 3)
+	k = 12;
+      else
+	k = 8;
+      if (j != k)
+	__builtin_abort ();
+    }
+  return 0;
+}

gcc/tree-vrp.c

@@ -7758,7 +7758,8 @@ union_ranges (enum value_range_type *vr0type,
     }
   else if ((operand_less_p (vr1min, *vr0max) == 1
 	    || operand_equal_p (vr1min, *vr0max, 0))
-	   && operand_less_p (*vr0min, vr1min) == 1)
+	   && operand_less_p (*vr0min, vr1min) == 1
+	   && operand_less_p (*vr0max, vr1max) == 1)
     {
       /* [  (  ]  ) or [   ](   ) */
       if (*vr0type == VR_RANGE
@@ -7792,7 +7793,8 @@ union_ranges (enum value_range_type *vr0type,
     }
   else if ((operand_less_p (*vr0min, vr1max) == 1
 	    || operand_equal_p (*vr0min, vr1max, 0))
-	   && operand_less_p (vr1min, *vr0min) == 1)
+	   && operand_less_p (vr1min, *vr0min) == 1
+	   && operand_less_p (vr1max, *vr0max) == 1)
     {
       /* (  [  )  ] or (   )[   ] */
       if (*vr0type == VR_RANGE