diff --git a/src/mir/Lowering.cpp b/src/mir/Lowering.cpp
index c0d6f93..0817fbb 100644
--- a/src/mir/Lowering.cpp
+++ b/src/mir/Lowering.cpp
@@ -154,16 +154,16 @@ void EmitValueToReg(const ir::Value* value, PhysReg target,
             slot = function.CreateFrameIndex(4);
             // 将 imm 写入栈槽（与 ConstantFloat 相同方式）
             if (isLegalMovImm(imm)) {
-                block.Append(Opcode::MovImm, {Operand::Reg(PhysReg::W8), Operand::Imm(static_cast<int64_t>(imm))});
+                block.Append(Opcode::MovImm, {Operand::Reg(PhysReg::W10), Operand::Imm(static_cast<int64_t>(imm))});
             } else {
                 uint16_t low = imm & 0xFFFF;
                 uint16_t high = (imm >> 16) & 0xFFFF;
-                block.Append(Opcode::MovImm, {Operand::Reg(PhysReg::W8), Operand::Imm(low)});
+                block.Append(Opcode::MovImm, {Operand::Reg(PhysReg::W10), Operand::Imm(low)});
                 if (high != 0) {
-                    block.Append(Opcode::Movk, {Operand::Reg(PhysReg::W8), Operand::Imm(high), Operand::Imm(16)});
+                    block.Append(Opcode::Movk, {Operand::Reg(PhysReg::W10), Operand::Imm(high), Operand::Imm(16)});
                 }
             }
-            block.Append(Opcode::StoreStack, {Operand::Reg(PhysReg::W8), Operand::FrameIndex(slot)});
+            block.Append(Opcode::StoreStack, {Operand::Reg(PhysReg::W10), Operand::FrameIndex(slot)});
             const_cast<ValueSlotMap&>(slots).emplace(value, slot);
         } else {
             slot = it->second;
@@ -209,16 +209,16 @@ void EmitValueToReg(const ir::Value* value, PhysReg target,
         
         // 同样需要对 int_val 进行大立即数分解
         if (isLegalMovImm(int_val)) {
-          block.Append(Opcode::MovImm, {Operand::Reg(PhysReg::W8), Operand::Imm(static_cast<int64_t>(int_val))});
+          block.Append(Opcode::MovImm, {Operand::Reg(PhysReg::W10), Operand::Imm(static_cast<int64_t>(int_val))});
         } else {
           uint16_t low = int_val & 0xFFFF;
           uint16_t high = (int_val >> 16) & 0xFFFF;
-          block.Append(Opcode::MovImm, {Operand::Reg(PhysReg::W8), Operand::Imm(low)});
+          block.Append(Opcode::MovImm, {Operand::Reg(PhysReg::W10), Operand::Imm(low)});
           if (high != 0) {
-            block.Append(Opcode::Movk, {Operand::Reg(PhysReg::W8), Operand::Imm(high), Operand::Imm(16)});
+            block.Append(Opcode::Movk, {Operand::Reg(PhysReg::W10), Operand::Imm(high), Operand::Imm(16)});
           }
         }
-        block.Append(Opcode::StoreStack, {Operand::Reg(PhysReg::W8), Operand::FrameIndex(slot)});
+        block.Append(Opcode::StoreStack, {Operand::Reg(PhysReg::W10), Operand::FrameIndex(slot)});
         const_cast<ValueSlotMap&>(slots).emplace(value, slot);
     } else {
         slot = it->second;
@@ -239,8 +239,8 @@ void EmitValueToReg(const ir::Value* value, PhysReg target,
           if (it == slots.end()) {
               slot = function.CreateFrameIndex(4);
               // 写入 0
-              block.Append(Opcode::MovImm, {Operand::Reg(PhysReg::W8), Operand::Imm(0)});
-              block.Append(Opcode::StoreStack, {Operand::Reg(PhysReg::W8), Operand::FrameIndex(slot)});
+              block.Append(Opcode::MovImm, {Operand::Reg(PhysReg::W10), Operand::Imm(0)});
+              block.Append(Opcode::StoreStack, {Operand::Reg(PhysReg::W10), Operand::FrameIndex(slot)});
               const_cast<ValueSlotMap&>(slots).emplace(value, slot);
           } else {
               slot = it->second;
@@ -768,8 +768,13 @@ void LowerInstruction(const ir::Instruction& inst, MachineFunction& function,
         std::string end_label   = ".L_fcset_end_"  + std::to_string(reinterpret_cast<uintptr_t>(&fcmp));
 
         // 5. 处理 NaN 情况
-        block.Append(Opcode::BCond, {Operand::Cond(CondCode::VS), Operand::Label(end_label)});
-
+        if (isOrdered) {
+            // 有序比较：如果无序 (V=1) → 直接结束（结果为 0）
+            block.Append(Opcode::BCond, {Operand::Cond(CondCode::VS), Operand::Label(end_label)});
+        } else {
+            // 无序比较：如果无序 (V=1) → 结果置 1
+            block.Append(Opcode::BCond, {Operand::Cond(CondCode::VS), Operand::Label(set1_label)});
+        }
         // 6. 正常条件跳转
         block.Append(Opcode::BCond, {Operand::Cond(cc), Operand::Label(set1_label)});