diff --git a/gen/gen_code.cpp b/gen/gen_code.cpp
index d81af9e..ef765d7 100644
--- a/gen/gen_code.cpp
+++ b/gen/gen_code.cpp
@@ -1089,6 +1089,7 @@ void put()
 		puts("void umonitor(const Reg& r) { int idx = r.getIdx(); if (idx > 7) XBYAK_THROW(ERR_BAD_PARAMETER) int bit = r.getBit(); if (BIT != bit) { if ((BIT == 32 && bit == 16) || (BIT == 64 && bit == 32)) { db(0x67); } else { XBYAK_THROW(ERR_BAD_SIZE_OF_REGISTER) } } db(0xF3); db(0x0F); db(0xAE); setModRM(3, 6, idx); }");
 		puts("void umwait(const Reg32& r) { int idx = r.getIdx(); if (idx > 7) XBYAK_THROW(ERR_BAD_PARAMETER) db(0xF2); db(0x0F); db(0xAE); setModRM(3, 6, idx); }");
 		puts("void clwb(const Address& addr) { db(0x66); opMIB(addr, esi, 0x0F, 0xAE); }");
+		puts("void cldemote(const Address& addr) { opMIB(addr, eax, 0x0F, 0x1C); }");
 	}
 	{
 		const struct Tbl {
diff --git a/test/misc.cpp b/test/misc.cpp
index f46239b..2b4f103 100644
--- a/test/misc.cpp
+++ b/test/misc.cpp
@@ -1924,3 +1924,24 @@ CYBOZU_TEST_AUTO(waitpkg)
 	CYBOZU_TEST_EQUAL(c.getSize(), n);
 	CYBOZU_TEST_EQUAL_ARRAY(c.getCode(), tbl, n);
 }
+
+CYBOZU_TEST_AUTO(misc)
+{
+	struct Code : Xbyak::CodeGenerator {
+		Code()
+		{
+			cldemote(ptr[eax+esi*4+0x12]);
+#ifdef XBYAK64
+			cldemote(ptr[rax+rdi*8+0x123]);
+#endif
+		}
+	} c;
+	const uint8_t tbl[] = {
+		// cldemote
+		0x67, 0x0f, 0x1c, 0x44, 0xb0, 0x12,
+		0x0f, 0x1c, 0x84, 0xf8, 0x23, 0x01, 0x00, 0x00
+	};
+	const size_t n = sizeof(tbl) / sizeof(tbl[0]);
+	CYBOZU_TEST_EQUAL(c.getSize(), n);
+	CYBOZU_TEST_EQUAL_ARRAY(c.getCode(), tbl, n);
+}