--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/fold-eqandnot-1.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,32 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-original" } */
+int test1(int a)
+{
+  return !(a & 4);
+}
+
+int test2(int b)
+{
+  return (b & 4) == 0;
+}
+
+int test3(int c)
+{
+  return ((c & 4) ^ 4) != 0;
+}
+
+int test4(int d)
+{
+  return ((d ^ 4) & 4) != 0;
+}
+
+int test5(int e)
+{
+  return (~e & 4) != 0;
+}
+
+/* { dg-final { scan-tree-dump-times "\\(a \& 4\\) == 0" 1 "original" } } */
+/* { dg-final { scan-tree-dump-times "\\(b \& 4\\) == 0" 1 "original" } } */
+/* { dg-final { scan-tree-dump-times "\\(c \& 4\\) == 0" 1 "original" } } */
+/* { dg-final { scan-tree-dump-times "\\(d \& 4\\) == 0" 1 "original" } } */
+/* { dg-final { scan-tree-dump-times "\\(e \& 4\\) == 0" 1 "original" } } */