Take into account the zero sign bit for positive numbers when computing the bit

width of an enum with negative values in IntRange.  Include a test for
-Wtautological-constant-out-of-range-compare where this had manifested.

llvm-svn: 168126

1 files changed, 10 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/compare.cpp b/clang/test/SemaCXX/compare.cpp
index 05980baf6d6..c76efe92baf 100644
--- a/clang/test/SemaCXX/compare.cpp
+++ b/clang/test/SemaCXX/compare.cpp
@@ -338,3 +338,13 @@ void test7(unsigned long other) {
   (void)((unsigned char)other != (unsigned short)(0x100)); // expected-warning{{true}}
   (void)((unsigned short)other != (unsigned char)(0xff));
 }
+
+void test8(int x) {
+  enum E {
+    Negative = -1,
+    Positive = 1
+  };
+
+  (void)((E)x == 1);
+  (void)((E)x == -1);
+}