diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 1e48bd65..be49a49c 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -101,6 +101,7 @@ add_library(dynarmic
     frontend/A64/translate/impl/simd_aes.cpp
     frontend/A64/translate/impl/simd_copy.cpp
     frontend/A64/translate/impl/simd_crypto_four_register.cpp
+    frontend/A64/translate/impl/simd_crypto_three_register.cpp
     frontend/A64/translate/impl/simd_extract.cpp
     frontend/A64/translate/impl/simd_modified_immediate.cpp
     frontend/A64/translate/impl/simd_permute.cpp
diff --git a/src/frontend/A64/decoder/a64.inc b/src/frontend/A64/decoder/a64.inc
index 29d0705b..d8b416c4 100644
--- a/src/frontend/A64/decoder/a64.inc
+++ b/src/frontend/A64/decoder/a64.inc
@@ -852,7 +852,7 @@ INST(USHLL,                  "USHLL, USHLL2",                             "0Q101
 //INST(FCMLA_elt,              "FCMLA (by element)",                        "0Q101111zzLMmmmm0rr1H0nnnnnddddd")
 
 // Data Processing - FP and SIMD - Cryptographic three register
-//INST(SM3TT1A,                "SM3TT1A",                                   "11001110010mmmmm10ii00nnnnnddddd")
+INST(SM3TT1A,                "SM3TT1A",                                   "11001110010mmmmm10ii00nnnnnddddd")
 //INST(SM3TT1B,                "SM3TT1B",                                   "11001110010mmmmm10ii01nnnnnddddd")
 //INST(SM3TT2A,                "SM3TT2A",                                   "11001110010mmmmm10ii10nnnnnddddd")
 //INST(SM3TT2B,                "SM3TT2B",                                   "11001110010mmmmm10ii11nnnnnddddd")
diff --git a/src/frontend/A64/translate/impl/simd_crypto_three_register.cpp b/src/frontend/A64/translate/impl/simd_crypto_three_register.cpp
new file mode 100644
index 00000000..a6809576
--- /dev/null
+++ b/src/frontend/A64/translate/impl/simd_crypto_three_register.cpp
@@ -0,0 +1,38 @@
+/* This file is part of the dynarmic project.
+ * Copyright (c) 2018 MerryMage
+ * This software may be used and distributed according to the terms of the GNU
+ * General Public License version 2 or any later version.
+ */
+
+#include "frontend/A64/translate/impl/impl.h"
+
+namespace Dynarmic::A64 {
+
+bool TranslatorVisitor::SM3TT1A(Vec Vm, Imm<2> imm2, Vec Vn, Vec Vd) {
+    const IR::U128 d = ir.GetQ(Vd);
+    const IR::U128 m = ir.GetQ(Vm);
+    const IR::U128 n = ir.GetQ(Vn);
+    const u32 index = imm2.ZeroExtend();
+
+    const IR::U32 top_d = ir.VectorGetElement(32, d, 3);
+    const IR::U32 before_top_d = ir.VectorGetElement(32, d, 2);
+    const IR::U32 after_low_d = ir.VectorGetElement(32, d, 1);
+    const IR::U32 low_d = ir.VectorGetElement(32, d, 0);
+    const IR::U32 top_n = ir.VectorGetElement(32, n, 3);
+
+    const IR::U32 wj_prime = ir.VectorGetElement(32, m, index);
+    const IR::U32 ss2 = ir.Eor(top_n, ir.RotateRight(top_d, ir.Imm8(20)));
+    const IR::U32 tt1 = ir.Eor(after_low_d, ir.Eor(top_d, before_top_d));
+    const IR::U32 final_tt1 = ir.Add(tt1, ir.Add(low_d, ir.Add(ss2, wj_prime)));
+
+    const IR::U128 zero_vector = ir.ZeroVector();
+    const IR::U128 tmp1 = ir.VectorSetElement(32, zero_vector, 0, after_low_d);
+    const IR::U128 tmp2 = ir.VectorSetElement(32, tmp1, 1, ir.RotateRight(before_top_d, ir.Imm8(23)));
+    const IR::U128 tmp3 = ir.VectorSetElement(32, tmp2, 2, top_d);
+    const IR::U128 result = ir.VectorSetElement(32, tmp3, 3, final_tt1);
+
+    ir.SetQ(Vd, result);
+    return true;
+}
+
+} // namespace Dynarmic::A64