re PR tree-optimization/78721 (ICE on valid code at -O2 and -O3 on…

re PR tree-optimization/78721 (ICE on valid code at -O2 and -O3 on x86_64-linux-gnu: in set_value_range, at tree-vrp.c:371)

gcc/testsuite/ChangeLog:

2016-12-09  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR ipa/78721
	* gcc.dg/pr78721.c: New test.

gcc/ChangeLog:

2016-12-09  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR ipa/78721
	* ipa-cp.c (propagate_vr_accross_jump_function): drop_tree_overflow
	after fold_convert.

From-SVN: r243501

gcc/ChangeLog

+2016-12-09  Kugan Vivekanandarajah  <kuganv@linaro.org>
+
+	PR ipa/78721
+	* ipa-cp.c (propagate_vr_accross_jump_function): drop_tree_overflow
+	after fold_convert.
+
 2016-12-09  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/72742

gcc/ipa-cp.c

@@ -1895,9 +1895,9 @@ propagate_vr_accross_jump_function (cgraph_edge *cs,
       tree val = ipa_get_jf_constant (jfunc);
       if (TREE_CODE (val) == INTEGER_CST)
 	{
+	  val = fold_convert (param_type, val);
 	  if (TREE_OVERFLOW_P (val))
 	    val = drop_tree_overflow (val);
-	  val = fold_convert (param_type, val);
 	  jfunc->vr_known = true;
 	  jfunc->m_vr.type = VR_RANGE;
 	  jfunc->m_vr.min = val;

gcc/testsuite/ChangeLog

+2016-12-09  Kugan Vivekanandarajah  <kuganv@linaro.org>
+
+	PR ipa/78721
+	* gcc.dg/pr78721.c: New test.
+
 2016-12-09  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/72742

gcc/testsuite/gcc.dg/pr78721.c

+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+int a, b, c;
+
+int fn1 (char e, char f)
+{
+  return !f || (e && f == 1);
+}
+
+void fn2 (char e)
+{
+  while (b)
+    e = 0;
+  a = 128;
+  c = fn1 (e, a == e);
+}
+
+int main ()
+{
+  fn2 (0);
+  return 0;
+}