diff --git a/gen/gen_avx512.cpp b/gen/gen_avx512.cpp
index b5acc87..f225097 100644
--- a/gen/gen_avx512.cpp
+++ b/gen/gen_avx512.cpp
@@ -550,6 +550,7 @@ void putCvt()
 		{ 0x13, "vcvtph2psx", T_66 | T_MAP6 | T_YMM | T_MUST_EVEX | T_EW0 | T_B16 | T_SAE_Y | T_N8 | T_N_VL, 1 },
 		{ 0x79, "vcvtph2udq", T_MAP5 | T_YMM | T_MUST_EVEX | T_EW0 | T_B16 | T_ER_Y | T_N8 | T_N_VL, 1 },
 		{ 0x5B, "vcvttph2dq", T_F3 | T_MAP5 | T_YMM | T_MUST_EVEX | T_EW0 | T_B16 | T_SAE_Y | T_N8 | T_N_VL, 1 },
+		{ 0x78, "vcvttph2udq", T_MAP5 | T_YMM | T_MUST_EVEX | T_EW0 | T_B16 | T_SAE_Y | T_N8 | T_N_VL, 1 },
 
 		{ 0x79, "vcvtpd2udq", T_0F | T_YMM | T_MUST_EVEX | T_EW1 | T_B64 | T_ER_Z, 2 },
 		{ 0x5B, "vcvtqq2ps", T_0F | T_YMM | T_MUST_EVEX | T_EW1 | T_B64 | T_ER_Z, 2 },
diff --git a/test/misc.cpp b/test/misc.cpp
index 6c3c6d0..043782a 100644
--- a/test/misc.cpp
+++ b/test/misc.cpp
@@ -1119,6 +1119,16 @@ CYBOZU_TEST_AUTO(vaddph)
 			vcvttph2dq(zmm1|k5|T_z, ptr [rax+0x40]);
 			vcvttph2dq(zmm1|k5|T_z, ptr_b [rax+0x40]);
 
+			vcvttph2udq(xmm1, xmm5);
+			vcvttph2udq(xmm1, ptr [rax+0x40]);
+			vcvttph2udq(xmm1, ptr_b [rax+0x40]);
+			vcvttph2udq(ymm1|k2|T_z, xmm5);
+			vcvttph2udq(ymm1, ptr [rax+0x40]);
+			vcvttph2udq(ymm1, ptr_b [rax+0x40]);
+			vcvttph2udq(zmm1|k5|T_z|T_sae, ymm3);
+			vcvttph2udq(zmm1|k5|T_z, ptr [rax+0x40]);
+			vcvttph2udq(zmm1|k5|T_z, ptr_b [rax+0x40]);
+
 		}
 	} c;
 	const uint8_t tbl[] = {
@@ -1419,6 +1429,17 @@ CYBOZU_TEST_AUTO(vaddph)
 		0x62, 0xf5, 0x7e, 0x9d, 0x5b, 0xcb,
 		0x62, 0xf5, 0x7e, 0xcd, 0x5b, 0x48, 0x02,
 		0x62, 0xf5, 0x7e, 0xdd, 0x5b, 0x48, 0x20,
+
+		// vcvttph2udq
+		0x62, 0xf5, 0x7c, 0x08, 0x78, 0xcd,
+		0x62, 0xf5, 0x7c, 0x08, 0x78, 0x48, 0x08,
+		0x62, 0xf5, 0x7c, 0x18, 0x78, 0x48, 0x20,
+		0x62, 0xf5, 0x7c, 0xaa, 0x78, 0xcd,
+		0x62, 0xf5, 0x7c, 0x28, 0x78, 0x48, 0x04,
+		0x62, 0xf5, 0x7c, 0x38, 0x78, 0x48, 0x20,
+		0x62, 0xf5, 0x7c, 0x9d, 0x78, 0xcb,
+		0x62, 0xf5, 0x7c, 0xcd, 0x78, 0x48, 0x02,
+		0x62, 0xf5, 0x7c, 0xdd, 0x78, 0x48, 0x20,
 	};
 	const size_t n = sizeof(tbl) / sizeof(tbl[0]);
 	CYBOZU_TEST_EQUAL(c.getSize(), n);
diff --git a/xbyak/xbyak_mnemonic.h b/xbyak/xbyak_mnemonic.h
index 1adb522..2b7275d 100644
--- a/xbyak/xbyak_mnemonic.h
+++ b/xbyak/xbyak_mnemonic.h
@@ -1920,6 +1920,7 @@ void vcvttpd2qq(const Xmm& x, const Operand& op) { opAVX_X_XM_IMM(x, op, T_66 |
 void vcvttpd2udq(const Xmm& x, const Operand& op) { opCvt2(x, op, T_0F | T_EW1 | T_YMM | T_SAE_Z | T_MUST_EVEX | T_B64, 0x78); }
 void vcvttpd2uqq(const Xmm& x, const Operand& op) { opAVX_X_XM_IMM(x, op, T_66 | T_0F | T_EW1 | T_YMM | T_SAE_Z | T_MUST_EVEX | T_B64, 0x78); }
 void vcvttph2dq(const Xmm& x, const Operand& op) { checkCvt1(x, op); opVex(x, 0, op, T_N8 | T_N_VL | T_F3 | T_MAP5 | T_EW0 | T_YMM | T_SAE_Y | T_MUST_EVEX | T_B16, 0x5B); }
+void vcvttph2udq(const Xmm& x, const Operand& op) { checkCvt1(x, op); opVex(x, 0, op, T_N8 | T_N_VL | T_MAP5 | T_EW0 | T_YMM | T_SAE_Y | T_MUST_EVEX | T_B16, 0x78); }
 void vcvttps2qq(const Xmm& x, const Operand& op) { checkCvt1(x, op); opVex(x, 0, op, T_N8 | T_N_VL | T_66 | T_0F | T_EW0 | T_YMM | T_SAE_Y | T_MUST_EVEX | T_B32, 0x7A); }
 void vcvttps2udq(const Xmm& x, const Operand& op) { opAVX_X_XM_IMM(x, op, T_0F | T_EW0 | T_YMM | T_SAE_Z | T_MUST_EVEX | T_B32, 0x78); }
 void vcvttps2uqq(const Xmm& x, const Operand& op) { checkCvt1(x, op); opVex(x, 0, op, T_N8 | T_N_VL | T_66 | T_0F | T_EW0 | T_YMM | T_SAE_Y | T_MUST_EVEX | T_B32, 0x78); }