--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/pr24574.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,36 @@
+/* { dg-do compile } */
+/* { dg-options "-O -fdump-tree-phiopt1" } */
+
+int f0(int i)
+{
+  if (i == 0) return 0;
+  return i/10;
+}
+int f1(int i)
+{
+  return i?i/10:0;
+}
+
+int f2(int i)
+{
+  if (i == 0) return 0;
+  return i%10;
+}
+int f3(int i)
+{
+  return i?i%10:0;
+}
+
+int f4(int i)
+{
+  if (i == 0) return 0;
+  return i<<10;
+}
+int f5(int i)
+{
+  return i?i<<10:0;
+}
+
+/* We should if-convert all functions to carry out the operation
+   unconditionally.  */
+/* { dg-final { scan-tree-dump-not "= PHI" "phiopt1" } } */