diff --git a/zuc/eia256_asm_ppc64x.s b/zuc/eia256_asm_ppc64x.s
index a737013..5fd7c97 100644
--- a/zuc/eia256_asm_ppc64x.s
+++ b/zuc/eia256_asm_ppc64x.s
@@ -93,19 +93,17 @@ TEXT ·eia256RoundTag8(SB),NOSPLIT,$0
 	VPMSUMD XTMP2, KS_M1, XTMP4
 	VXOR XTMP3, XTMP4, XTMP3
 	VSPLTW $2, XTMP3, XTMP3
-	VSLDOI $12, XDIGEST, XTMP3, XDIGEST
 
 	// Update tag
-	MFVSRD XDIGEST, R8
 #ifdef GOARCH_ppc64le
-	MOVDBR (R3), R6
-	XOR R6, R8, R6
-	MOVDBR R6, (R3)
+	VSLDOI $12, XTMP3, XDIGEST, XDIGEST
 #else
+	VSLDOI $12, XDIGEST, XTMP3, XDIGEST
+#endif
+	MFVSRD XDIGEST, R8
 	MOVD (R3), R6
 	XOR R6, R8, R6
 	MOVD R6, (R3)
-#endif
 
 	// Copy last 16 bytes of KS to the front
 	MOVD $16, R8