--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/fold-popcount-4.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,50 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-cddce1" } */
+
+int test_shiftmax(unsigned int a)
+{
+  return __builtin_popcount(a>>(8*sizeof(a)-1));
+}
+
+int test_shiftmaxl(unsigned long b)
+{
+  return __builtin_popcountl(b>>(8*sizeof(b)-1));
+}
+
+int test_shiftmaxll(unsigned long long c)
+{
+  return __builtin_popcountll(c>>(8*sizeof(c)-1));
+}
+
+int test_shift7(unsigned char d)
+{
+  return __builtin_popcount(d>>7);
+}
+
+int test_shift7l(unsigned char e)
+{
+  return __builtin_popcountl(e>>7);
+}
+
+int test_shift7ll(unsigned char f)
+{
+  return __builtin_popcountll(f>>7);
+}
+
+int test_shift15(unsigned short g)
+{
+  return __builtin_popcount(g>>15);
+}
+
+int test_shift15l(unsigned short h)
+{
+  return __builtin_popcountl(h>>15);
+}
+
+int test_shift15ll(unsigned short i)
+{
+  return __builtin_popcountll(i>>15);
+}
+
+/* { dg-final { scan-tree-dump-times "popcount" 0 "cddce1" } } */
+