diff --git a/sm4/asm_arm64.s b/sm4/asm_arm64.s
index baa97ec..504e62d 100644
--- a/sm4/asm_arm64.s
+++ b/sm4/asm_arm64.s
@@ -161,7 +161,6 @@ TEXT ·expandKeyAsm(SB),NOSPLIT,$0
   VLD1 (R8), [t0.B16]; 
   VTBL FLIP_MASK.B16, [t0.B16], t0.B16
   VEOR t0.B16, FK_MASK.B16, t0.B16
-  VUSHR $4, t0.D2, t0.D2
   VMOV t0.S[1], t1.S[0]
   VMOV t0.S[2], t2.S[0]
   VMOV t0.S[3], t3.S[0]
@@ -175,14 +174,15 @@ TEXT ·expandKeyAsm(SB),NOSPLIT,$0
   VEOR t1.B16, x.B16, x.B16
   VEOR t2.B16, x.B16, x.B16
   VEOR t3.B16, x.B16, x.B16
-  VAND x.B16, NIBBLE_MASK.B16, XTMP7.B16
+  VAND x.B16, NIBBLE_MASK.B16, x.B16
+ /* 
   VTBL XTMP7.B16, [M1L.B16], y.B16
   VUSHR $4, x.D2, x.D2
   VAND x.B16, NIBBLE_MASK.B16, XTMP7.B16
   VTBL XTMP7.B16, [M1H.B16], XTMP7.B16
   VEOR y.B16, XTMP7.B16, x.B16
   VTBL INVERSE_SHIFT_ROWS.B16, [x.B16], x.B16
-
+*/
   VEOR x.B16, t0.B16, t0.B16
   
   VMOV t0.S[0], R2