diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index f56798cb925..90a2c66865b 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2015-10-16  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* gcc.target/i386/iamcu/test_basic_returning.c
+	(def_test_returning_type): Use union to check float return bits.
+
 2015-10-16  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* gcc.target/i386/iamcu/test_basic_64bit_returning.c (main):
diff --git a/gcc/testsuite/gcc.target/i386/iamcu/test_basic_returning.c b/gcc/testsuite/gcc.target/i386/iamcu/test_basic_returning.c
index 23efa6e5c01..e617d8dfc82 100644
--- a/gcc/testsuite/gcc.target/i386/iamcu/test_basic_returning.c
+++ b/gcc/testsuite/gcc.target/i386/iamcu/test_basic_returning.c
@@ -39,7 +39,10 @@ fun_test_returning_float (void)
 
 #define def_test_returning_type(fun, type, ret, reg) \
   { type var = WRAP_RET (fun) (); \
-  assert (ret == (type) reg && ret == var); }
+    union { type r; unsigned long reg; } u; \
+    u.reg = reg; \
+  assert (ret == u.r && ret == var); }
+
 int
 main (void)
 {