--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/c-c++-common/Wlogical-not-parentheses-3.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,31 @@
+/* PR c/77423 */
+/* { dg-do compile } */
+/* { dg-options "-Wlogical-not-parentheses" } */
+
+#ifndef __cplusplus
+# define bool _Bool
+#endif
+
+int
+f (int a, bool b, bool c)
+{
+  int r = 0;
+
+  r += !a == (b | c);
+  r += !a == (b ^ c);
+  r += !a == (b & c);
+  r += !a == ~b;
+  r += !a == ~(int) b;
+  r += !a == ((b & c) | c);
+  r += !a == ((b & c) | (b ^ c));
+  r += !a == (int) (b ^ c);
+  r += !a == (int) ~b;
+  r += !a == ~~b;
+  r += !a == ~(b | c);
+  r += !a == ~(b | (a == 1));
+  r += !a == ~(a == 1);
+
+  r += !a == ((b & c) | (b ^ a)); /* { dg-warning "logical not is only applied to the left hand side of comparison" } */
+
+  return r;
+}