From e248d72f5ca07c889fcfa90640d3d647acc63bee Mon Sep 17 00:00:00 2001
From: mxr <>
Date: Wed, 15 Apr 2026 12:34:38 +0800
Subject: [PATCH] =?UTF-8?q?(mir)=E4=BF=AE=E5=A4=8D=E4=BC=A0=E9=80=92?=
 =?UTF-8?q?=E5=8F=82=E6=95=B0=E6=98=AF=E6=8C=87=E9=92=88=E5=AD=98=E5=9C=A8?=
 =?UTF-8?q?=E7=9A=84=E9=97=AE=E9=A2=98?=
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---
 src/mir/Lowering.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/mir/Lowering.cpp b/src/mir/Lowering.cpp
index a509514..cfb6285 100644
--- a/src/mir/Lowering.cpp
+++ b/src/mir/Lowering.cpp
@@ -590,8 +590,11 @@ void LowerInstruction(const ir::Instruction& inst, MachineFunction& function,
           EmitValueToReg(arg, reg, slots, block, function);
           fpArgCount++;
         } else {
-          // 整数参数
-          PhysReg reg = static_cast<PhysReg>(static_cast<int>(PhysReg::W0) + intArgCount);
+          // 区分指针与普通整数：指针使用 64 位 Xn 寄存器
+          bool isPointer = argType->IsPtrInt32() || argType->IsPtrFloat() || argType->IsPtrInt1() ||
+                          argType->IsArray(); // 数组在作为函数参数时会退化为指针
+          PhysReg baseReg = isPointer ? PhysReg::X0 : PhysReg::W0;
+          PhysReg reg = static_cast<PhysReg>(static_cast<int>(baseReg) + intArgCount);
           EmitValueToReg(arg, reg, slots, block, function);
           intArgCount++;
         }