diff --git a/sm4/asm_arm64.s b/sm4/asm_arm64.s
index 8fb24be..f601f7d 100644
--- a/sm4/asm_arm64.s
+++ b/sm4/asm_arm64.s
@@ -202,10 +202,6 @@ loop:
   MOVW.P R2, 4(R10)
   MOVW.P R2, -4(R11)
 
-  ADD $16, R0 
-  CMP $4*32, R0
-  BNE loop
-
 expand_end:  
   RET