diff --git a/sm4/asm_ppc64x.s b/sm4/asm_ppc64x.s
index 3f8e041..66fc591 100644
--- a/sm4/asm_ppc64x.s
+++ b/sm4/asm_ppc64x.s
@@ -151,7 +151,7 @@ TEXT ·expandKeyAsm(SB),NOSPLIT,$0
 	LVX	(R4), ESPERMW
 #endif
 	MOVD	$·rcon+0x50(SB), R4
-	LXVD2X	(R4)(R0), REVERSE_WORDS
+	LXVD2X (R4)(R0), REVERSE_WORDS
 	MOVD $16, R3
 	LXVD2X (R4)(R3), NIBBLE_MASK
 	MOVD $32, R3
@@ -173,32 +173,36 @@ TEXT ·expandKeyAsm(SB),NOSPLIT,$0
 	ADD $112, R6
 
 	// prepare counter
-	MOVD $8, R7
-	MOVD R7, CTR
+//	MOVD $8, R7
+//	MOVD R7, CTR
+
+	VSPLTISB $0, V6 // VZERO  V6
 
 	// load key
 	PPC64X_LXVW4X(R3, R0, V0)
-	VSLDOI $4, V0, V0, V1
-	VSLDOI $4, V1, V1, V2
-	VSLDOI $4, V2, V2, V3
+	VSLDOI $4, V0, V6, V1
+	VSLDOI $4, V1, V6, V2
+	VSLDOI $4, V2, V6, V3
 
 ksLoop:
+	VSPLTISB $0, V5 // VZERO  V5
 	LXVW4X (R4), V4
 	SM4_EXPANDKEY_ROUND(V4, V7, V8, V9, V0, V1, V2, V3, V5)
-	VSLDOI $4, V4, V4, V4
+	VSLDOI $4, V4, V6, V4
 	SM4_EXPANDKEY_ROUND(V4, V7, V8, V9, V1, V2, V3, V0, V5)
-	VSLDOI $4, V4, V4, V4
+	VSLDOI $4, V4, V6, V4
 	SM4_EXPANDKEY_ROUND(V4, V7, V8, V9, V2, V3, V0, V1, V5)
-	VSLDOI $4, V4, V4, V4
+	VSLDOI $4, V4, V6, V4
 	SM4_EXPANDKEY_ROUND(V4, V7, V8, V9, V3, V0, V1, V2, V5)
 	STXVW4X V5, (R5)
-	VPERM V5, V5, REVERSE_WORDS, V5
+	VPERM V5, V6, REVERSE_WORDS, V5
 	STXVW4X V5, (R6)
+/*	
 	ADD $16, R5
 	ADD $16, R4
 	ADD $-16, R6
 	BDNZ	ksLoop
-
+*/
     RET
 
 // func encryptBlocksAsm(xk *uint32, dst, src []byte, inst int)