diff --git a/sm4/aesni_macros_ppc64x.s b/sm4/aesni_macros_ppc64x.s
index 3d7ab9b..f162c6d 100644
--- a/sm4/aesni_macros_ppc64x.s
+++ b/sm4/aesni_macros_ppc64x.s
@@ -84,11 +84,7 @@
 // -  y: 128 bits temp register
 // -  z: 128 bits temp register
 #define AFFINE_TRANSFORM(L, H, V_FOUR, x, y, z)  \
-	VAND NIBBLE_MASK, x, z;              \
-	VPERM L, L, z, y;                    \
-	VSRB x, V_FOUR, z;                   \
-	VPERM H, H, z, x;                    \
-	VXOR y, x, x
+	VPERMXOR L, H, x, x
 
 // Affine Transform
 // parameters: