diff --git a/gen/gen_code.cpp b/gen/gen_code.cpp
index c2db4ac..e1d912e 100644
--- a/gen/gen_code.cpp
+++ b/gen/gen_code.cpp
@@ -1443,7 +1443,6 @@ void put()
 			printf("void %s(const Xmm& x, const Operand& op) { opSSE_APX(x, op, T_0F38, 0x%02X, T_MUST_EVEX, 0x%02X); }\n", p->name, p->code, p->code2);
 		}
 		puts("void sha1rnds4(const Xmm& x, const Operand& op, uint8_t imm) { opSSE_APX(x, op, T_0F3A, 0xCC, T_MUST_EVEX, 0xD4, imm); }");
-		puts("void sha1msg12(const Xmm& x, const Operand& op) { opROO(Reg(), op, x, T_MUST_EVEX, 0xD9); }");
 	}
 	// (m, x), (m, y)
 	{
diff --git a/xbyak/xbyak_mnemonic.h b/xbyak/xbyak_mnemonic.h
index 4854e0c..1addb06 100644
--- a/xbyak/xbyak_mnemonic.h
+++ b/xbyak/xbyak_mnemonic.h
@@ -988,7 +988,6 @@ void sets(const Operand& op) { opSetCC(op, 8); }//-V524
 void setz(const Operand& op) { opSetCC(op, 4); }//-V524
 void sfence() { db(0x0F); db(0xAE); db(0xF8); }
 void sha1msg1(const Xmm& x, const Operand& op) { opSSE_APX(x, op, T_0F38, 0xC9, T_MUST_EVEX, 0xD9); }
-void sha1msg12(const Xmm& x, const Operand& op) { opROO(Reg(), op, x, T_MUST_EVEX, 0xD9); }
 void sha1msg2(const Xmm& x, const Operand& op) { opSSE_APX(x, op, T_0F38, 0xCA, T_MUST_EVEX, 0xDA); }
 void sha1nexte(const Xmm& x, const Operand& op) { opSSE_APX(x, op, T_0F38, 0xC8, T_MUST_EVEX, 0xD8); }
 void sha1rnds4(const Xmm& x, const Operand& op, uint8_t imm) { opSSE_APX(x, op, T_0F3A, 0xCC, T_MUST_EVEX, 0xD4, imm); }