From 240cf3e5e1458271756997fe61a6c9ef2c85b84f Mon Sep 17 00:00:00 2001
From: Jakub Jelinek <jakub@redhat.com>
Date: Tue, 5 Dec 2017 14:33:52 +0100
Subject: [PATCH] re PR tree-optimization/83283 (Casting from boolean to
 unsigned char to enum returns incorrect results)

	PR tree-optimization/83283
	* g++.dg/torture/pr83283.C: New test.

From-SVN: r255417
---
 gcc/testsuite/ChangeLog                |  5 +++++
 gcc/testsuite/g++.dg/torture/pr83283.C | 26 ++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/torture/pr83283.C

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index b9b09d49415..6a9ce85fee5 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2017-12-05  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/83283
+	* g++.dg/torture/pr83283.C: New test.
+
 2017-12-05  Ed Schonberg  <schonberg@adacore.com>
 
 	* gnat.dg/private_overriding.adb: New testcase.
diff --git a/gcc/testsuite/g++.dg/torture/pr83283.C b/gcc/testsuite/g++.dg/torture/pr83283.C
new file mode 100644
index 00000000000..62274a97978
--- /dev/null
+++ b/gcc/testsuite/g++.dg/torture/pr83283.C
@@ -0,0 +1,26 @@
+// PR tree-optimization/83283
+// { dg-do run }
+// { dg-additional-options "-std=c++11" }
+
+enum E : unsigned char { X = 0, Y = 1 };
+
+void __attribute__((noinline))
+foo (E *v, int size)
+{
+  for (int i = 0; i < size; ++i)
+    {
+      const bool b = (v[i] == E::Y);
+      v[i] = static_cast<E>(static_cast<unsigned char>(b));
+    }
+}
+
+int
+main ()
+{
+  constexpr int items = 32;
+  E vals[items] = {X};
+  vals[3] = Y;
+  foo (vals, items);
+  if (vals[3] != 1)
+    __builtin_abort ();
+}
-- 
2.30.2