修复GEP中32位整型索引变量误用问题

src/mir/Lowering.cpp

@@ -7,7 +7,7 @@
 #include "ir/IR.h"
 #include "utils/Log.h"
 
-//#define DEBUG_Lower
+#define DEBUG_Lower
 
 #ifdef DEBUG_Lower
 #include <iostream>
@@ -765,13 +765,13 @@ void LowerInstruction(const ir::Instruction& inst, MachineFunction& function,
                 }
                 
                 // 加载当前索引到 x10
-                EmitValueToReg(indices[idx_pos], PhysReg::X10, slots, block, function);
+                EmitValueToReg(indices[idx_pos], PhysReg::W10, slots, block, function);
                 
                 // 乘以步长
-                block.Append(Opcode::MovImm, {Operand::Reg(PhysReg::X11), Operand::Imm(strides[i])});
-                block.Append(Opcode::MulRR, {Operand::Reg(PhysReg::X10),
-                                            Operand::Reg(PhysReg::X10),
-                                            Operand::Reg(PhysReg::X11)});
+                block.Append(Opcode::MovImm, {Operand::Reg(PhysReg::W11), Operand::Imm(strides[i])});
+                block.Append(Opcode::MulRR, {Operand::Reg(PhysReg::W10),
+                                            Operand::Reg(PhysReg::W10),
+                                            Operand::Reg(PhysReg::W11)});
                 
                 // 累加到偏移量
                 block.Append(Opcode::AddRR, {Operand::Reg(PhysReg::X9),