Fix def_test_returning_type in iamcu/test_basic_returning.c

Use union to check float return bits to avoid converting from integer
to float when comparing float return value.

	* gcc.target/i386/iamcu/test_basic_returning.c
	(def_test_returning_type): Use union to check float return bits.

From-SVN: r228924

gcc/testsuite/ChangeLog

 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):
 	Replace printf with __builtin_printf.
 

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)
 {