diff --git a/src/dynarmic/backend/arm64/emit_arm64.cpp b/src/dynarmic/backend/arm64/emit_arm64.cpp
index 2680c93c..065f2184 100644
--- a/src/dynarmic/backend/arm64/emit_arm64.cpp
+++ b/src/dynarmic/backend/arm64/emit_arm64.cpp
@@ -40,7 +40,7 @@ template<>
 void EmitIR<IR::Opcode::CallHostFunction>(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst) {
     auto args = ctx.reg_alloc.GetArgumentInfo(inst);
 
-    ctx.reg_alloc.PrepareForCall(nullptr, args[1], args[2], args[3]);
+    ctx.reg_alloc.PrepareForCall(args[1], args[2], args[3]);
     code.MOV(Xscratch0, args[0].GetImmediateU64());
     code.BLR(Xscratch0);
 }
diff --git a/src/dynarmic/backend/arm64/emit_arm64_a32.cpp b/src/dynarmic/backend/arm64/emit_arm64_a32.cpp
index f8fc5eee..3d43bcb7 100644
--- a/src/dynarmic/backend/arm64/emit_arm64_a32.cpp
+++ b/src/dynarmic/backend/arm64/emit_arm64_a32.cpp
@@ -555,7 +555,7 @@ void EmitIR<IR::Opcode::A32UpdateUpperLocationDescriptor>(oaknut::CodeGenerator&
 template<>
 void EmitIR<IR::Opcode::A32CallSupervisor>(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst) {
     auto args = ctx.reg_alloc.GetArgumentInfo(inst);
-    ctx.reg_alloc.PrepareForCall(nullptr);
+    ctx.reg_alloc.PrepareForCall();
 
     if (ctx.conf.enable_cycle_counting) {
         code.LDR(Xscratch0, SP, offsetof(StackLayout, cycles_to_run));
@@ -576,7 +576,7 @@ void EmitIR<IR::Opcode::A32CallSupervisor>(oaknut::CodeGenerator& code, EmitCont
 template<>
 void EmitIR<IR::Opcode::A32ExceptionRaised>(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst) {
     auto args = ctx.reg_alloc.GetArgumentInfo(inst);
-    ctx.reg_alloc.PrepareForCall(nullptr);
+    ctx.reg_alloc.PrepareForCall();
 
     if (ctx.conf.enable_cycle_counting) {
         code.LDR(Xscratch0, SP, offsetof(StackLayout, cycles_to_run));
@@ -611,7 +611,7 @@ void EmitIR<IR::Opcode::A32InstructionSynchronizationBarrier>(oaknut::CodeGenera
         return;
     }
 
-    ctx.reg_alloc.PrepareForCall(nullptr);
+    ctx.reg_alloc.PrepareForCall();
     EmitRelocation(code, ctx, LinkTarget::InstructionSynchronizationBarrierRaised);
 }
 
diff --git a/src/dynarmic/backend/arm64/emit_arm64_a32_coprocessor.cpp b/src/dynarmic/backend/arm64/emit_arm64_a32_coprocessor.cpp
index 6f2f75c7..746757e9 100644
--- a/src/dynarmic/backend/arm64/emit_arm64_a32_coprocessor.cpp
+++ b/src/dynarmic/backend/arm64/emit_arm64_a32_coprocessor.cpp
@@ -24,7 +24,7 @@ static void EmitCoprocessorException() {
 }
 
 static void CallCoprocCallback(oaknut::CodeGenerator& code, EmitContext& ctx, A32::Coprocessor::Callback callback, IR::Inst* inst = nullptr, std::optional<Argument::copyable_reference> arg0 = {}, std::optional<Argument::copyable_reference> arg1 = {}) {
-    ctx.reg_alloc.PrepareForCall(inst, {}, arg0, arg1);
+    const auto Xresult = ctx.reg_alloc.PrepareForCallReg(inst, {}, arg0, arg1);
 
     if (callback.user_arg) {
         code.MOV(X0, reinterpret_cast<u64>(*callback.user_arg));
@@ -32,6 +32,7 @@ static void CallCoprocCallback(oaknut::CodeGenerator& code, EmitContext& ctx, A3
 
     code.MOV(Xscratch0, reinterpret_cast<u64>(callback.function));
     code.BLR(Xscratch0);
+    code.MOV(Xresult, X0);
 }
 
 template<>
diff --git a/src/dynarmic/backend/arm64/emit_arm64_a32_memory.cpp b/src/dynarmic/backend/arm64/emit_arm64_a32_memory.cpp
index e0bf558c..1cf5f774 100644
--- a/src/dynarmic/backend/arm64/emit_arm64_a32_memory.cpp
+++ b/src/dynarmic/backend/arm64/emit_arm64_a32_memory.cpp
@@ -25,18 +25,19 @@ static bool IsOrdered(IR::AccType acctype) {
 
 static void EmitReadMemory(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst, LinkTarget fn) {
     auto args = ctx.reg_alloc.GetArgumentInfo(inst);
-    ctx.reg_alloc.PrepareForCall(inst, {}, args[1]);
+    auto Xresult = ctx.reg_alloc.PrepareForCallReg(inst, {}, args[1]);
     const bool ordered = IsOrdered(args[2].GetImmediateAccType());
 
     EmitRelocation(code, ctx, fn);
     if (ordered) {
         code.DMB(oaknut::BarrierOp::ISH);
     }
+    code.MOV(Xresult, X0);
 }
 
 static void EmitExclusiveReadMemory(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst, LinkTarget fn) {
     auto args = ctx.reg_alloc.GetArgumentInfo(inst);
-    ctx.reg_alloc.PrepareForCall(inst, {}, args[1]);
+    auto Xresult = ctx.reg_alloc.PrepareForCallReg(inst, {}, args[1]);
     const bool ordered = IsOrdered(args[2].GetImmediateAccType());
 
     code.MOV(Wscratch0, 1);
@@ -45,11 +46,12 @@ static void EmitExclusiveReadMemory(oaknut::CodeGenerator& code, EmitContext& ct
     if (ordered) {
         code.DMB(oaknut::BarrierOp::ISH);
     }
+    code.MOV(Xresult, X0);
 }
 
 static void EmitWriteMemory(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst, LinkTarget fn) {
     auto args = ctx.reg_alloc.GetArgumentInfo(inst);
-    ctx.reg_alloc.PrepareForCall(inst, {}, args[1], args[2]);
+    ctx.reg_alloc.PrepareForCall({}, args[1], args[2]);
     const bool ordered = IsOrdered(args[3].GetImmediateAccType());
 
     if (ordered) {
@@ -63,7 +65,7 @@ static void EmitWriteMemory(oaknut::CodeGenerator& code, EmitContext& ctx, IR::I
 
 static void EmitExclusiveWriteMemory(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst, LinkTarget fn) {
     auto args = ctx.reg_alloc.GetArgumentInfo(inst);
-    ctx.reg_alloc.PrepareForCall(inst, {}, args[1], args[2]);
+    auto Xresult = ctx.reg_alloc.PrepareForCallReg(inst, {}, args[1], args[2]);
     const bool ordered = IsOrdered(args[3].GetImmediateAccType());
 
     oaknut::Label end;
@@ -79,6 +81,7 @@ static void EmitExclusiveWriteMemory(oaknut::CodeGenerator& code, EmitContext& c
         code.DMB(oaknut::BarrierOp::ISH);
     }
     code.l(end);
+    code.MOV(Xresult, X0);
 }
 
 template<>
diff --git a/src/dynarmic/backend/arm64/emit_arm64_a64.cpp b/src/dynarmic/backend/arm64/emit_arm64_a64.cpp
index 469fc5ea..00405a03 100644
--- a/src/dynarmic/backend/arm64/emit_arm64_a64.cpp
+++ b/src/dynarmic/backend/arm64/emit_arm64_a64.cpp
@@ -342,7 +342,7 @@ void EmitIR<IR::Opcode::A64SetPC>(oaknut::CodeGenerator& code, EmitContext& ctx,
 template<>
 void EmitIR<IR::Opcode::A64CallSupervisor>(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst) {
     auto args = ctx.reg_alloc.GetArgumentInfo(inst);
-    ctx.reg_alloc.PrepareForCall(nullptr);
+    ctx.reg_alloc.PrepareForCall();
 
     if (ctx.conf.enable_cycle_counting) {
         code.LDR(Xscratch0, SP, offsetof(StackLayout, cycles_to_run));
@@ -363,7 +363,7 @@ void EmitIR<IR::Opcode::A64CallSupervisor>(oaknut::CodeGenerator& code, EmitCont
 template<>
 void EmitIR<IR::Opcode::A64ExceptionRaised>(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst) {
     auto args = ctx.reg_alloc.GetArgumentInfo(inst);
-    ctx.reg_alloc.PrepareForCall(nullptr);
+    ctx.reg_alloc.PrepareForCall();
 
     if (ctx.conf.enable_cycle_counting) {
         code.LDR(Xscratch0, SP, offsetof(StackLayout, cycles_to_run));
@@ -385,14 +385,14 @@ void EmitIR<IR::Opcode::A64ExceptionRaised>(oaknut::CodeGenerator& code, EmitCon
 template<>
 void EmitIR<IR::Opcode::A64DataCacheOperationRaised>(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst) {
     auto args = ctx.reg_alloc.GetArgumentInfo(inst);
-    ctx.reg_alloc.PrepareForCall(nullptr, {}, args[1], args[2]);
+    ctx.reg_alloc.PrepareForCall({}, args[1], args[2]);
     EmitRelocation(code, ctx, LinkTarget::DataCacheOperationRaised);
 }
 
 template<>
 void EmitIR<IR::Opcode::A64InstructionCacheOperationRaised>(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst) {
     auto args = ctx.reg_alloc.GetArgumentInfo(inst);
-    ctx.reg_alloc.PrepareForCall(nullptr, {}, args[0], args[1]);
+    ctx.reg_alloc.PrepareForCall({}, args[0], args[1]);
     EmitRelocation(code, ctx, LinkTarget::InstructionCacheOperationRaised);
 }
 
@@ -412,7 +412,7 @@ void EmitIR<IR::Opcode::A64InstructionSynchronizationBarrier>(oaknut::CodeGenera
         return;
     }
 
-    ctx.reg_alloc.PrepareForCall(nullptr);
+    ctx.reg_alloc.PrepareForCall();
     EmitRelocation(code, ctx, LinkTarget::InstructionSynchronizationBarrierRaised);
 }
 
@@ -426,8 +426,9 @@ void EmitIR<IR::Opcode::A64GetCNTFRQ>(oaknut::CodeGenerator& code, EmitContext&
 template<>
 void EmitIR<IR::Opcode::A64GetCNTPCT>(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst) {
     // FIXME: AddTicks / GetTicksRemaining
-    ctx.reg_alloc.PrepareForCall(inst);
+    auto Xresult = ctx.reg_alloc.PrepareForCallReg(inst);
     EmitRelocation(code, ctx, LinkTarget::GetCNTPCT);
+    code.MOV(Xresult, X0);
 }
 
 template<>
diff --git a/src/dynarmic/backend/arm64/emit_arm64_a64_memory.cpp b/src/dynarmic/backend/arm64/emit_arm64_a64_memory.cpp
index 38062956..55c185b7 100644
--- a/src/dynarmic/backend/arm64/emit_arm64_a64_memory.cpp
+++ b/src/dynarmic/backend/arm64/emit_arm64_a64_memory.cpp
@@ -25,18 +25,31 @@ static bool IsOrdered(IR::AccType acctype) {
 
 static void EmitReadMemory(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst, LinkTarget fn) {
     auto args = ctx.reg_alloc.GetArgumentInfo(inst);
-    ctx.reg_alloc.PrepareForCall(inst, {}, args[1]);
+    auto Xresult = ctx.reg_alloc.PrepareForCallReg(inst, {}, args[1]);
     const bool ordered = IsOrdered(args[2].GetImmediateAccType());
 
     EmitRelocation(code, ctx, fn);
     if (ordered) {
         code.DMB(oaknut::BarrierOp::ISH);
     }
+    code.MOV(Xresult, X0);
+}
+
+static void EmitReadMemory128(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst, LinkTarget fn) {
+    auto args = ctx.reg_alloc.GetArgumentInfo(inst);
+    auto Qresult = ctx.reg_alloc.PrepareForCallVec(inst, {}, args[1]);
+    const bool ordered = IsOrdered(args[2].GetImmediateAccType());
+
+    EmitRelocation(code, ctx, fn);
+    if (ordered) {
+        code.DMB(oaknut::BarrierOp::ISH);
+    }
+    code.MOV(Qresult.B16(), Q0.B16());
 }
 
 static void EmitExclusiveReadMemory(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst, LinkTarget fn) {
     auto args = ctx.reg_alloc.GetArgumentInfo(inst);
-    ctx.reg_alloc.PrepareForCall(inst, {}, args[1]);
+    auto Xresult = ctx.reg_alloc.PrepareForCallReg(inst, {}, args[1]);
     const bool ordered = IsOrdered(args[2].GetImmediateAccType());
 
     code.MOV(Wscratch0, 1);
@@ -45,11 +58,26 @@ static void EmitExclusiveReadMemory(oaknut::CodeGenerator& code, EmitContext& ct
     if (ordered) {
         code.DMB(oaknut::BarrierOp::ISH);
     }
+    code.MOV(Xresult, X0);
+}
+
+static void EmitExclusiveReadMemory128(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst, LinkTarget fn) {
+    auto args = ctx.reg_alloc.GetArgumentInfo(inst);
+    auto Qresult = ctx.reg_alloc.PrepareForCallVec(inst, {}, args[1]);
+    const bool ordered = IsOrdered(args[2].GetImmediateAccType());
+
+    code.MOV(Wscratch0, 1);
+    code.STRB(Wscratch0, Xstate, offsetof(A64JitState, exclusive_state));
+    EmitRelocation(code, ctx, fn);
+    if (ordered) {
+        code.DMB(oaknut::BarrierOp::ISH);
+    }
+    code.MOV(Qresult.B16(), Q0.B16());
 }
 
 static void EmitWriteMemory(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst, LinkTarget fn) {
     auto args = ctx.reg_alloc.GetArgumentInfo(inst);
-    ctx.reg_alloc.PrepareForCall(inst, {}, args[1], args[2]);
+    ctx.reg_alloc.PrepareForCall({}, args[1], args[2]);
     const bool ordered = IsOrdered(args[3].GetImmediateAccType());
 
     if (ordered) {
@@ -63,7 +91,7 @@ static void EmitWriteMemory(oaknut::CodeGenerator& code, EmitContext& ctx, IR::I
 
 static void EmitExclusiveWriteMemory(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst, LinkTarget fn) {
     auto args = ctx.reg_alloc.GetArgumentInfo(inst);
-    ctx.reg_alloc.PrepareForCall(inst, {}, args[1], args[2]);
+    auto Xresult = ctx.reg_alloc.PrepareForCallReg(inst, {}, args[1], args[2]);
     const bool ordered = IsOrdered(args[3].GetImmediateAccType());
 
     oaknut::Label end;
@@ -79,6 +107,7 @@ static void EmitExclusiveWriteMemory(oaknut::CodeGenerator& code, EmitContext& c
         code.DMB(oaknut::BarrierOp::ISH);
     }
     code.l(end);
+    code.MOV(Xresult, X0);
 }
 
 template<>
@@ -108,7 +137,7 @@ void EmitIR<IR::Opcode::A64ReadMemory64>(oaknut::CodeGenerator& code, EmitContex
 
 template<>
 void EmitIR<IR::Opcode::A64ReadMemory128>(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst) {
-    EmitReadMemory(code, ctx, inst, LinkTarget::ReadMemory128);
+    EmitReadMemory128(code, ctx, inst, LinkTarget::ReadMemory128);
 }
 
 template<>
@@ -133,7 +162,7 @@ void EmitIR<IR::Opcode::A64ExclusiveReadMemory64>(oaknut::CodeGenerator& code, E
 
 template<>
 void EmitIR<IR::Opcode::A64ExclusiveReadMemory128>(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst) {
-    EmitExclusiveReadMemory(code, ctx, inst, LinkTarget::ExclusiveReadMemory128);
+    EmitExclusiveReadMemory128(code, ctx, inst, LinkTarget::ExclusiveReadMemory128);
 }
 
 template<>
diff --git a/src/dynarmic/backend/arm64/reg_alloc.cpp b/src/dynarmic/backend/arm64/reg_alloc.cpp
index 2dff0080..e40216c9 100644
--- a/src/dynarmic/backend/arm64/reg_alloc.cpp
+++ b/src/dynarmic/backend/arm64/reg_alloc.cpp
@@ -138,7 +138,7 @@ bool RegAlloc::IsValueLive(IR::Inst* inst) const {
     return !!ValueLocation(inst);
 }
 
-void RegAlloc::PrepareForCall(IR::Inst* result, std::optional<Argument::copyable_reference> arg0, std::optional<Argument::copyable_reference> arg1, std::optional<Argument::copyable_reference> arg2, std::optional<Argument::copyable_reference> arg3) {
+void RegAlloc::PrepareForCall(std::optional<Argument::copyable_reference> arg0, std::optional<Argument::copyable_reference> arg1, std::optional<Argument::copyable_reference> arg2, std::optional<Argument::copyable_reference> arg3) {
     fpsr_manager.Spill();
     SpillFlags();
 
@@ -180,14 +180,20 @@ void RegAlloc::PrepareForCall(IR::Inst* result, std::optional<Argument::copyable
             ngrn++;
         }
     }
+}
 
-    if (result) {
-        if (result->GetType() == IR::Type::U128) {
-            DefineAsRegister(result, Q0);
-        } else {
-            DefineAsRegister(result, X0);
-        }
-    }
+oaknut::XReg RegAlloc::PrepareForCallReg(IR::Inst* result, std::optional<Argument::copyable_reference> arg0, std::optional<Argument::copyable_reference> arg1, std::optional<Argument::copyable_reference> arg2, std::optional<Argument::copyable_reference> arg3) {
+    PrepareForCall(arg0, arg1, arg2, arg3);
+    ASSERT(result && result->GetType() != IR::Type::U128);
+    DefineAsRegister(result, X0);
+    return X0;
+}
+
+oaknut::QReg RegAlloc::PrepareForCallVec(IR::Inst* result, std::optional<Argument::copyable_reference> arg0, std::optional<Argument::copyable_reference> arg1, std::optional<Argument::copyable_reference> arg2, std::optional<Argument::copyable_reference> arg3) {
+    PrepareForCall(arg0, arg1, arg2, arg3);
+    ASSERT(result && result->GetType() == IR::Type::U128);
+    DefineAsRegister(result, Q8);
+    return Q8;
 }
 
 void RegAlloc::DefineAsExisting(IR::Inst* inst, Argument& arg) {
diff --git a/src/dynarmic/backend/arm64/reg_alloc.h b/src/dynarmic/backend/arm64/reg_alloc.h
index c8560e25..4d5c3fe7 100644
--- a/src/dynarmic/backend/arm64/reg_alloc.h
+++ b/src/dynarmic/backend/arm64/reg_alloc.h
@@ -271,11 +271,9 @@ public:
         }
     }
 
-    void PrepareForCall(IR::Inst* result = nullptr,
-                        std::optional<Argument::copyable_reference> arg0 = {},
-                        std::optional<Argument::copyable_reference> arg1 = {},
-                        std::optional<Argument::copyable_reference> arg2 = {},
-                        std::optional<Argument::copyable_reference> arg3 = {});
+    void PrepareForCall(std::optional<Argument::copyable_reference> arg0 = {}, std::optional<Argument::copyable_reference> arg1 = {}, std::optional<Argument::copyable_reference> arg2 = {}, std::optional<Argument::copyable_reference> arg3 = {});
+    oaknut::XReg PrepareForCallReg(IR::Inst* result, std::optional<Argument::copyable_reference> arg0 = {}, std::optional<Argument::copyable_reference> arg1 = {}, std::optional<Argument::copyable_reference> arg2 = {}, std::optional<Argument::copyable_reference> arg3 = {});
+    oaknut::QReg PrepareForCallVec(IR::Inst* result, std::optional<Argument::copyable_reference> arg0 = {}, std::optional<Argument::copyable_reference> arg1 = {}, std::optional<Argument::copyable_reference> arg2 = {}, std::optional<Argument::copyable_reference> arg3 = {});
 
     void DefineAsExisting(IR::Inst* inst, Argument& arg);
     void DefineAsRegister(IR::Inst* inst, oaknut::Reg reg);