diff --git a/sm9/bn256/gfp_ppc64x.s b/sm9/bn256/gfp_ppc64x.s
index dd3882e..9640cb1 100644
--- a/sm9/bn256/gfp_ppc64x.s
+++ b/sm9/bn256/gfp_ppc64x.s
@@ -48,12 +48,12 @@ TEXT ·gfpNegAsm(SB),0,$0-16
 	VSUBEUQM PH, Y1H, CAR1, T1H // subtract part1 using carry from part2
 
 	VSUBCUQ Y1L, PL, CAR1
-	VSUBUQM Y1L, PL, Y1L
+	VSUBUQM Y1L, PL, TT0
 	VSUBECUQ Y1H, PH, CAR1, SEL1
-	VSUBEUQM Y1H, PH, CAR1, Y1H
+	VSUBEUQM Y1H, PH, CAR1, TT1
 
-	VSEL T1H, Y1H, SEL1, Y1H
-	VSEL T1L, Y1L, SEL1, Y1L
+	VSEL T1H, TT1, SEL1, Y1H
+	VSEL T1L, TT0, SEL1, Y1L
 
 	XXPERMDI Y1H, Y1H, $2, Y1H
 	XXPERMDI Y1L, Y1L, $2, Y1L
@@ -96,7 +96,7 @@ TEXT ·gfpSubAsm(SB),0,$0-24
 
 	MOVD $·p2+0(SB), R7
 	LXVD2X (R7)(R0), PL
-	LXVD2X (R7)(R5), PH
+	LXVD2X (R7)(R6), PH
 	XXPERMDI PH, PH, $2, PH
 	XXPERMDI PL, PL, $2, PL
 
@@ -142,7 +142,7 @@ TEXT ·gfpAddAsm(SB),0,$0-24
 
 	MOVD $·p2+0(SB), R7
 	LXVD2X (R7)(R0), PL
-	LXVD2X (R7)(R5), PH
+	LXVD2X (R7)(R6), PH
 	XXPERMDI PH, PH, $2, PH
 	XXPERMDI PL, PL, $2, PL
 
@@ -169,7 +169,7 @@ TEXT ·gfpDoubleAsm(SB),0,$0-16
 
 	MOVD $·p2+0(SB), R7
 	LXVD2X (R7)(R0), PL
-	LXVD2X (R7)(R5), PH
+	LXVD2X (R7)(R6), PH
 	XXPERMDI PH, PH, $2, PH
 	XXPERMDI PL, PL, $2, PL
 
@@ -200,7 +200,7 @@ TEXT ·gfpTripleAsm(SB),0,$0-16
 
 	MOVD $·p2+0(SB), R7
 	LXVD2X (R7)(R0), PL
-	LXVD2X (R7)(R5), PH
+	LXVD2X (R7)(R6), PH
 	XXPERMDI PH, PH, $2, PH
 	XXPERMDI PL, PL, $2, PL