diff --git a/src/backend_x64/emit_x64_vector.cpp b/src/backend_x64/emit_x64_vector.cpp
index fc4d1ccf..3ddc6419 100644
--- a/src/backend_x64/emit_x64_vector.cpp
+++ b/src/backend_x64/emit_x64_vector.cpp
@@ -485,6 +485,31 @@ void EmitX64::EmitVectorEqual128(EmitContext& ctx, IR::Inst* inst) {
     }
 }
 
+void EmitX64::EmitVectorGreaterS8(EmitContext& ctx, IR::Inst* inst) {
+    EmitVectorOperation(code, ctx, inst, &Xbyak::CodeGenerator::pcmpgtb);
+}
+
+void EmitX64::EmitVectorGreaterS16(EmitContext& ctx, IR::Inst* inst) {
+    EmitVectorOperation(code, ctx, inst, &Xbyak::CodeGenerator::pcmpgtw);
+}
+
+void EmitX64::EmitVectorGreaterS32(EmitContext& ctx, IR::Inst* inst) {
+    EmitVectorOperation(code, ctx, inst, &Xbyak::CodeGenerator::pcmpgtd);
+}
+
+void EmitX64::EmitVectorGreaterS64(EmitContext& ctx, IR::Inst* inst) {
+    if (code.DoesCpuSupport(Xbyak::util::Cpu::tSSE42)) {
+        EmitVectorOperation(code, ctx, inst, &Xbyak::CodeGenerator::pcmpgtq);
+        return;
+    }
+
+    EmitTwoArgumentFallback(code, ctx, inst, [](std::array<u64, 2>& result, const std::array<s64, 2>& a, const std::array<s64, 2>& b){
+        for (size_t i = 0; i < 2; ++i) {
+            result[i] = (a[i] > b[i]) ? ~u64(0) : 0;
+        }
+    });
+}
+
 static void EmitVectorInterleaveLower(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst, int size) {
     auto args = ctx.reg_alloc.GetArgumentInfo(inst);
 
diff --git a/src/frontend/ir/ir_emitter.cpp b/src/frontend/ir/ir_emitter.cpp
index 342815b1..6d4f890b 100644
--- a/src/frontend/ir/ir_emitter.cpp
+++ b/src/frontend/ir/ir_emitter.cpp
@@ -872,6 +872,21 @@ U128 IREmitter::VectorEqual(size_t esize, const U128& a, const U128& b) {
     return {};
 }
 
+U128 IREmitter::VectorGreaterSigned(size_t esize, const U128& a, const U128& b) {
+    switch (esize) {
+    case 8:
+        return Inst<U128>(Opcode::VectorGreaterS8, a, b);
+    case 16:
+        return Inst<U128>(Opcode::VectorGreaterS16, a, b);
+    case 32:
+        return Inst<U128>(Opcode::VectorGreaterS32, a, b);
+    case 64:
+        return Inst<U128>(Opcode::VectorGreaterS64, a, b);
+    }
+    UNREACHABLE();
+    return {};
+}
+
 U128 IREmitter::VectorInterleaveLower(size_t esize, const U128& a, const U128& b) {
     switch (esize) {
     case 8:
diff --git a/src/frontend/ir/ir_emitter.h b/src/frontend/ir/ir_emitter.h
index 1f94edff..0f62ae7b 100644
--- a/src/frontend/ir/ir_emitter.h
+++ b/src/frontend/ir/ir_emitter.h
@@ -215,6 +215,7 @@ public:
     U128 VectorBroadcastLower(size_t esize, const UAny& a);
     U128 VectorEor(const U128& a, const U128& b);
     U128 VectorEqual(size_t esize, const U128& a, const U128& b);
+    U128 VectorGreaterSigned(size_t esize, const U128& a, const U128& b);
     U128 VectorInterleaveLower(size_t esize, const U128& a, const U128& b);
     U128 VectorLogicalShiftLeft(size_t esize, const U128& a, u8 shift_amount);
     U128 VectorLogicalShiftRight(size_t esize, const U128& a, u8 shift_amount);
diff --git a/src/frontend/ir/opcodes.inc b/src/frontend/ir/opcodes.inc
index 21a7003a..a7a1d4c3 100644
--- a/src/frontend/ir/opcodes.inc
+++ b/src/frontend/ir/opcodes.inc
@@ -226,6 +226,10 @@ OPCODE(VectorEqual16,               T::U128,        T::U128,        T::U128
 OPCODE(VectorEqual32,               T::U128,        T::U128,        T::U128                         )
 OPCODE(VectorEqual64,               T::U128,        T::U128,        T::U128                         )
 OPCODE(VectorEqual128,              T::U128,        T::U128,        T::U128                         )
+OPCODE(VectorGreaterS8,             T::U128,        T::U128,        T::U128                         )
+OPCODE(VectorGreaterS16,            T::U128,        T::U128,        T::U128                         )
+OPCODE(VectorGreaterS32,            T::U128,        T::U128,        T::U128                         )
+OPCODE(VectorGreaterS64,            T::U128,        T::U128,        T::U128                         )
 OPCODE(VectorInterleaveLower8,      T::U128,        T::U128,        T::U128                         )
 OPCODE(VectorInterleaveLower16,     T::U128,        T::U128,        T::U128                         )
 OPCODE(VectorInterleaveLower32,     T::U128,        T::U128,        T::U128                         )