diff --git a/src/frontend/A64/decoder/a64.inc b/src/frontend/A64/decoder/a64.inc
index 903144a1..1af9139a 100644
--- a/src/frontend/A64/decoder/a64.inc
+++ b/src/frontend/A64/decoder/a64.inc
@@ -324,7 +324,7 @@ INST(AESIMC,                 "AESIMC",                                    "01001
 // Data Processing - FP and SIMD - SHA
 INST(SHA1C,                  "SHA1C",                                     "01011110000mmmmm000000nnnnnddddd")
 INST(SHA1P,                  "SHA1P",                                     "01011110000mmmmm000100nnnnnddddd")
-//INST(SHA1M,                  "SHA1M",                                     "01011110000mmmmm001000nnnnnddddd")
+INST(SHA1M,                  "SHA1M",                                     "01011110000mmmmm001000nnnnnddddd")
 INST(SHA1SU0,                "SHA1SU0",                                   "01011110000mmmmm001100nnnnnddddd")
 //INST(SHA256H,                "SHA256H",                                   "01011110000mmmmm010000nnnnnddddd")
 //INST(SHA256H2,               "SHA256H2",                                  "01011110000mmmmm010100nnnnnddddd")
diff --git a/src/frontend/A64/translate/impl/simd_sha.cpp b/src/frontend/A64/translate/impl/simd_sha.cpp
index 42435890..a973fd0d 100644
--- a/src/frontend/A64/translate/impl/simd_sha.cpp
+++ b/src/frontend/A64/translate/impl/simd_sha.cpp
@@ -11,6 +11,11 @@ namespace {
 IR::U32 SHAchoose(IREmitter& ir, IR::U32 x, IR::U32 y, IR::U32 z) {
     return ir.Eor(ir.And(ir.Eor(y, z), x), z);
 }
+
+IR::U32 SHAmajority(IREmitter& ir, IR::U32 x, IR::U32 y, IR::U32 z) {
+    return ir.Or(ir.And(x, y), ir.And(ir.Or(x, y), z)) ;
+}
+
 IR::U32 SHAparity(IREmitter& ir, IR::U32 x, IR::U32 y, IR::U32 z) {
     return ir.Eor(ir.Eor(y, z), x);
 }
@@ -50,6 +55,12 @@ bool TranslatorVisitor::SHA1C(Vec Vm, Vec Vn, Vec Vd) {
     return true;
 }
 
+bool TranslatorVisitor::SHA1M(Vec Vm, Vec Vn, Vec Vd) {
+    const IR::U128 result = SHA1HashUpdate(ir, Vm, Vn, Vd, SHAmajority);
+    ir.SetQ(Vd, result);
+    return true;
+}
+
 bool TranslatorVisitor::SHA1P(Vec Vm, Vec Vn, Vec Vd) {
     const IR::U128 result = SHA1HashUpdate(ir, Vm, Vn, Vd, SHAparity);
     ir.SetQ(Vd, result);