diff --git a/sample/Makefile b/sample/Makefile
index 2010f69..ff94b3a 100644
--- a/sample/Makefile
+++ b/sample/Makefile
@@ -30,7 +30,7 @@ else
 endif
 
 ifeq ($(BIT),64)
-TARGET += test64 bf64 memfunc64 test_util64 jmp_table64 zero_upper ccmp
+TARGET += test64 bf64 memfunc64 test_util64 jmp_table64 zero_upper ccmp no_flags
 ifeq ($(BOOST_EXIST),1)
 TARGET += calc64 #calc2_64
 endif
@@ -111,6 +111,10 @@ ccmp: ccmp.cpp $(XBYAK_INC)
 	$(CXX) $(CFLAGS) ccmp.cpp -o $@
 test_ccmp: ccmp
 	sde -future -- ./ccmp
+no_flags: no_flags.cpp $(XBYAK_INC)
+	$(CXX) $(CFLAGS) no_flags.cpp -o $@
+test_no_flags: no_flags
+	sde -future -- ./no_flags
 
 clean:
 	rm -rf $(TARGET) profiler profiler-vtune
diff --git a/sample/no_flags.cpp b/sample/no_flags.cpp
new file mode 100644
index 0000000..8ab08df
--- /dev/null
+++ b/sample/no_flags.cpp
@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <xbyak/xbyak.h>
+
+struct Code : Xbyak::CodeGenerator {
+	Code(bool nf) {
+		if (nf) {
+			puts("no flags (with T_nf)");
+		} else {
+			puts("change flags (without T_nf)");
+		}
+		xor_(eax, eax); // CF = 0
+		mov(eax, -1);
+		if (nf) {
+			add(eax|T_nf, eax, 1); // does not change CF
+		} else {
+			add(eax, eax, 1); // CF = 1
+		}
+		adc(eax, 0); // eax = CF ? 1 : 0
+		ret();
+	}
+};
+
+int main() {
+	for (int i = 0; i < 2; i++) {
+		Code c(i);
+		printf("i=%d ret=%d\n", i, c.getCode<int(*)()>()());
+	}
+}