re PR tree-optimization/86231 (vrp_meet causes wrong-code)

	PR tree-optimization/86231
	* tree-vrp.c (union_ranges): For (  [  )  ] or (   )[   ] range and
	anti-range don't overwrite *vr0min before using it to compute *vr0max.

	* gcc.dg/tree-ssa/vrp119.c: New test.
	* gcc.c-torture/execute/pr86231.c: New test.

From-SVN: r261805

gcc/ChangeLog

+2018-06-20  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/86231
+	* tree-vrp.c (union_ranges): For (  [  )  ] or (   )[   ] range and
+	anti-range don't overwrite *vr0min before using it to compute *vr0max.
+
 2018-06-20  Tom de Vries  <tdevries@suse.de>
 
 	PR tree-optimization/86097

gcc/testsuite/ChangeLog

+2018-06-20  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/86231
+	* gcc.dg/tree-ssa/vrp119.c: New test.
+	* gcc.c-torture/execute/pr86231.c: New test.
+
 2018-06-20  Tom de Vries  <tdevries@suse.de>
 
 	PR tree-optimization/86097

gcc/testsuite/gcc.c-torture/execute/pr86231.c

+/* PR tree-optimization/86231 */
+
+#define ONE ((void *) 1)
+#define TWO ((void *) 2)
+
+__attribute__((noipa)) int
+foo (void *p, int x)
+{
+  if (p == ONE) return 0;
+  if (!p)
+    p = x ? TWO : ONE;
+  return p == ONE ? 0 : 1;
+}
+
+int v[8];
+
+int
+main ()
+{
+  if (foo ((void *) 0, 0) != 0
+      || foo ((void *) 0, 1) != 1
+      || foo (ONE, 0) != 0
+      || foo (ONE, 1) != 0
+      || foo (TWO, 0) != 1
+      || foo (TWO, 1) != 1
+      || foo (&v[7], 0) != 1
+      || foo (&v[7], 1) != 1)
+    __builtin_abort ();
+  return 0;
+}

gcc/testsuite/gcc.dg/tree-ssa/vrp119.c

+/* PR tree-optimization/86231 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-vrp1" } */
+/* { dg-final { scan-tree-dump-not "link_error" "vrp1" } } */
+
+int bar (int);
+void link_error (void);
+
+int
+foo (int x, int y, int z)
+{
+  if (x < 4 || x > 8) __builtin_unreachable ();
+  if (y >= 2 && y <= 6) __builtin_unreachable ();
+  /* x is [4, 8], y is ~[2, 6], resulting range of e should be ~[2, 3].  */
+  int e = (z ? x : y);
+  bar (bar (bar (bar (bar (bar (bar (bar (bar (bar (bar (bar (e))))))))))));
+  if (e == 2 || e == 3)
+    link_error ();
+  return e;
+}

gcc/tree-vrp.c

@@ -5922,9 +5922,9 @@ union_ranges (enum value_range_type *vr0type,
 	  if (TREE_CODE (*vr0min) == INTEGER_CST)
 	    {
 	      *vr0type = vr1type;
-	      *vr0min = vr1min;
 	      *vr0max = int_const_binop (MINUS_EXPR, *vr0min,
 					 build_int_cst (TREE_TYPE (*vr0min), 1));
+	      *vr0min = vr1min;
 	    }
 	  else
 	    goto give_up;