diff --git a/asm.vp b/asm.vp
index f1b0f4c..ae55d66 100644
--- a/asm.vp
+++ b/asm.vp
@@ -18,9 +18,13 @@ def pause():
 
 def inb(port: t.CUInt16T) -> t.CUInt8T:
     value: t.CUInt32T
+    # 显式 mov 到输出寄存器：EAX 作临时（CLOBBER_RAX 声明），避免
+    # AsmOut 分配到非 RAX 时读到 asm 前残留（加 CLOBBER_RAX 后 LLVM
+    # 不再把 value 绑到 RAX，需 asm 内显式存值）。
     c.Asm(f"""mov edx, {c.AsmInp(t.CUInt32T(port), t.ASM_DESCR.REG_ANY)}
               in al, dx
-              movzx eax, al""",
+              movzx eax, al
+              mov {c.AsmOut(value, t.ASM_DESCR.OUTPUT_REG)}, eax""",
     out = [c.AsmOut(value, t.ASM_DESCR.OUTPUT_REG)],
     op =[t.ASM_DESCR.CLOBBER_RDX, t.ASM_DESCR.CLOBBER_RAX])
     return t.CUInt8T(value)
@@ -36,7 +40,8 @@ def inw(port: t.CUInt16T) -> t.CUInt16T:
     value: t.CUInt32T
     c.Asm(f"""mov edx, {c.AsmInp(t.CUInt32T(port), t.ASM_DESCR.REG_ANY)}
               in ax, dx
-              movzx eax, ax""",
+              movzx eax, ax
+              mov {c.AsmOut(value, t.ASM_DESCR.OUTPUT_REG)}, eax""",
     out = [c.AsmOut(value, t.ASM_DESCR.OUTPUT_REG)],
     op =[t.ASM_DESCR.CLOBBER_RDX, t.ASM_DESCR.CLOBBER_RAX])
     return t.CUInt16T(value)
@@ -50,7 +55,8 @@ def outw(port: t.CUInt16T, value: t.CUInt16T):
 def inl(port: t.CUInt16T) -> t.CUInt32T:
     value: t.CUInt32T
     c.Asm(f"""mov edx, {c.AsmInp(t.CUInt32T(port), t.ASM_DESCR.REG_ANY)}
-              in eax, dx""",
+              in eax, dx
+              mov {c.AsmOut(value, t.ASM_DESCR.OUTPUT_REG)}, eax""",
     out = [c.AsmOut(value, t.ASM_DESCR.OUTPUT_REG)],
     op =[t.ASM_DESCR.CLOBBER_RDX, t.ASM_DESCR.CLOBBER_RAX])
     return value