diff --git a/zuc/eia_asm_ppc64x.s b/zuc/eia_asm_ppc64x.s
index 122b6ee..f581c45 100644
--- a/zuc/eia_asm_ppc64x.s
+++ b/zuc/eia_asm_ppc64x.s
@@ -59,8 +59,8 @@ TEXT ·eia3Round16B(SB),NOSPLIT,$0
 	VSRW	XDATA, XTMP2, XTMP1
 	VAND	BIT_REV_AND_TAB, XTMP1, XTMP1
 
-	MOVD	$0x20, PTR
-	LXVD2X (PTR)(R0), BIT_REV_TAB_L
+	MOVD	$0x10, R8
+	LXVD2X (PTR)(R8), BIT_REV_TAB_L
 	VSLB  BIT_REV_TAB_L, XTMP2, BIT_REV_TAB_H
 	VPERM BIT_REV_TAB_L, BIT_REV_TAB_L, XTMP3, XTMP3
 	VPERM BIT_REV_TAB_H, BIT_REV_TAB_H, XTMP1, XTMP1
@@ -69,19 +69,19 @@ TEXT ·eia3Round16B(SB),NOSPLIT,$0
 	// ZUC authentication part, 4x32 data bits
 	// setup data
 	VSPLTISB $0, XTMP2
-	MOVD $0x30, PTR
-	LXVD2X (PTR)(R0), XTMP4
+	MOVD $0x20, R8
+	LXVD2X (PTR)(R8), XTMP4
 	VPERM XTMP2, XTMP3, XTMP4, XTMP1
-	MOVD $0x40, PTR
-	LXVD2X (PTR)(R0), XTMP4
+	MOVD $0x30, R8
+	LXVD2X (PTR)(R8), XTMP4
 	VPERM XTMP2, XTMP3, XTMP4, XTMP2
 
 	// setup KS
 	LXVW4X (R4), KS_L
-	MOVD $8, PTR
-	LXVW4X (PTR)(R4), KS_M1
-	MOVD $0x50, PTR
-	LXVD2X (PTR)(R0), XTMP1
+	MOVD $8, R8
+	LXVW4X (R8)(R4), KS_M1
+	MOVD $0x40, R8
+	LXVD2X (PTR)(R8), XTMP1
 	VPERM KS_L, KS_L, XTMP1, KS_L
 	VPERM KS_M1, KS_M1, XTMP1, KS_M1
 
@@ -94,14 +94,14 @@ TEXT ·eia3Round16B(SB),NOSPLIT,$0
 	VSPLTW $2, XTMP3, XDIGEST
 
 	// Update tag
-	MFVSRWZ XDIGEST, PTR
+	MFVSRWZ XDIGEST, R8
 	MOVWZ (R3), R6
-	XOR R6, PTR, R6 
+	XOR R6, R8, R6 
 	MOVW R6, (R3)
 
 	// Copy last 16 bytes of KS to the front
-	MOVD $16, PTR
-	LXVD2X (PTR)(R4), XTMP1
+	MOVD $16, R8
+	LXVD2X (R8)(R4), XTMP1
 	STXVD2X XTMP1, (R4)(R0)
 
 	RET