diff --git a/internal/sm2ec/p256_asm_amd64.s b/internal/sm2ec/p256_asm_amd64.s
index 979fcc59..7069219d 100644
--- a/internal/sm2ec/p256_asm_amd64.s
+++ b/internal/sm2ec/p256_asm_amd64.s
@@ -2095,7 +2095,6 @@ TEXT sm2P256MulInternal(SB),NOSPLIT,$8
 	CMPB ·supportBMI2+0(SB), $0x01
 	JEQ  internalMulBMI2
 
-	// [t3, t2, t1, t0] * acc4
 	MOVQ acc4, mul0
 	MULQ t0
 	MOVQ mul0, acc0
@@ -2119,7 +2118,6 @@ TEXT sm2P256MulInternal(SB),NOSPLIT,$8
 	ADCQ $0, mul1
 	MOVQ mul1, acc4
 
-	// [t3, t2, t1, t0] * acc5
 	MOVQ acc5, mul0
 	MULQ t0
 	ADDQ mul0, acc1
@@ -2150,7 +2148,6 @@ TEXT sm2P256MulInternal(SB),NOSPLIT,$8
 	ADCQ $0, mul1
 	MOVQ mul1, acc5
 
-	// [t3, t2, t1, t0] * acc6
 	MOVQ acc6, mul0
 	MULQ t0
 	ADDQ mul0, acc2
@@ -2181,7 +2178,6 @@ TEXT sm2P256MulInternal(SB),NOSPLIT,$8
 	ADCQ $0, mul1
 	MOVQ mul1, acc6
 
-	// [t3, t2, t1, t0] * acc7
 	MOVQ acc7, mul0
 	MULQ t0
 	ADDQ mul0, acc3
@@ -2211,8 +2207,6 @@ TEXT sm2P256MulInternal(SB),NOSPLIT,$8
 	ADDQ mul0, acc6
 	ADCQ $0, mul1
 	MOVQ mul1, acc7
-
-	// T = [acc7, acc6, acc5, acc4, acc3, acc2, acc1, acc0]
 	// First reduction step
 	MOVQ acc0, mul0
 	MOVQ acc0, mul1
@@ -2298,9 +2292,7 @@ TEXT sm2P256MulInternal(SB),NOSPLIT,$8
 	CMOVQCS acc3, acc7
 
 	RET
-
 internalMulBMI2:
-	// [t3, t2, t1, t0] * acc4
 	MOVQ acc4, mul1
 	MULXQ t0, acc0, acc1
 
@@ -2314,7 +2306,6 @@ internalMulBMI2:
 	ADCQ mul0, acc3
 	ADCQ $0, acc4
 
-	// [t3, t2, t1, t0] * acc5
 	MOVQ acc5, mul1
 	MULXQ t0, mul0, hlp
 	ADDQ mul0, acc1
@@ -2335,7 +2326,6 @@ internalMulBMI2:
 	ADDQ mul0, acc4
 	ADCQ $0, acc5
 
-	// [t3, t2, t1, t0] * acc6
 	MOVQ acc6, mul1
 	MULXQ t0, mul0, hlp
 	ADDQ mul0, acc2
@@ -2356,7 +2346,6 @@ internalMulBMI2:
 	ADDQ mul0, acc5
 	ADCQ $0, acc6
 
-	// [t3, t2, t1, t0] * acc7
 	MOVQ acc7, mul1
 	MULXQ t0, mul0, hlp
 	ADDQ mul0, acc3
@@ -2377,7 +2366,6 @@ internalMulBMI2:
 	ADDQ mul0, acc6
 	ADCQ $0, acc7
 
-	// T = [acc7, acc6, acc5, acc4, acc3, acc2, acc1, acc0]
 	// First reduction step
 	MOVQ acc0, mul0
 	MOVQ acc0, mul1
@@ -2554,7 +2542,6 @@ TEXT sm2P256SqrInternal(SB),NOSPLIT,$8
 	CMPB ·supportBMI2+0(SB), $0x01
 	JEQ  internalSqrBMI2
 
-	// [acc7, acc6, acc5] * acc4
 	MOVQ acc4, mul0
 	MULQ acc5
 	MOVQ mul0, acc1
@@ -2572,7 +2559,6 @@ TEXT sm2P256SqrInternal(SB),NOSPLIT,$8
 	ADCQ $0, mul1
 	MOVQ mul1, t0
 
-	// [acc7, acc6] * acc5
 	MOVQ acc5, mul0
 	MULQ acc6
 	ADDQ mul0, acc3
@@ -2587,7 +2573,6 @@ TEXT sm2P256SqrInternal(SB),NOSPLIT,$8
 	ADCQ $0, mul1
 	MOVQ mul1, t1
 
-	// acc7 * acc6
 	MOVQ acc6, mul0
 	MULQ acc7
 	ADDQ mul0, t1
@@ -2628,70 +2613,64 @@ TEXT sm2P256SqrInternal(SB),NOSPLIT,$8
 	ADCQ mul0, t2
 	ADCQ DX, t3
 
-	// T = [t3, t2, t1, t0, acc3, acc2, acc1, acc0]
 	sm2P256SqrReductionInternal()
 	RET
 
 internalSqrBMI2:
-	XORQ t3, t3
-
-	// [acc7, acc6, acc5] * acc4
 	MOVQ acc4, mul1
 	MULXQ acc5, acc1, acc2
 
 	MULXQ acc6, mul0, acc3
-	ADOXQ mul0, acc2
+	ADDQ mul0, acc2
 
 	MULXQ acc7, mul0, t0
-	ADOXQ mul0, acc3
-	ADOXQ t3, t0
+	ADCQ mul0, acc3
+	ADCQ $0, t0
 
-	// [acc7, acc6] * acc5
 	MOVQ acc5, mul1
 	MULXQ acc6, mul0, hlp
-	ADOXQ mul0, acc3
+	ADDQ mul0, acc3
+	ADCQ hlp, t0
 
 	MULXQ acc7, mul0, t1
-	ADCXQ hlp, mul0
-	ADOXQ mul0, t0
-	ADCXQ t3, t1
+	ADCQ $0, t1
+	ADDQ mul0, t0
 
-	// acc7 * acc6
 	MOVQ acc6, mul1
 	MULXQ acc7, mul0, t2
-	ADOXQ mul0, t1
-	ADOXQ t3, t2
-	
+	ADCQ mul0, t1
+	ADCQ $0, t2
+	XORQ t3, t3
+
 	// *2
-	ADOXQ acc1, acc1
-	ADOXQ acc2, acc2
-	ADOXQ acc3, acc3
-	ADOXQ t0, t0
-	ADOXQ t1, t1
-	ADOXQ t2, t2
-	ADOXQ t3, t3
+	ADDQ acc1, acc1
+	ADCQ acc2, acc2
+	ADCQ acc3, acc3
+	ADCQ t0, t0
+	ADCQ t1, t1
+	ADCQ t2, t2
+	ADCQ $0, t3
 
 	// Missing products
 	MOVQ acc4, mul1
 	MULXQ mul1, acc0, acc4 
-	ADCXQ acc4, acc1
+	ADDQ acc4, acc1
 
 	MOVQ acc5, mul1
 	MULXQ mul1, mul0, acc4
-	ADCXQ mul0, acc2
-	ADCXQ acc4, acc3
+	ADCQ mul0, acc2
+	ADCQ  acc4, acc3
 
 	MOVQ acc6, mul1
 	MULXQ mul1, mul0, acc4
-	ADCXQ mul0, t0
-	ADCXQ acc4, t1
+	ADCQ mul0, t0
+	ADCQ acc4, t1
 
 	MOVQ acc7, mul1
 	MULXQ mul1, mul0, acc4
-	ADCXQ mul0, t2
-	ADCXQ acc4, t3
-
-	// T = [t3, t2, t1, t0, acc3, acc2, acc1, acc0]
+	ADCQ mul0, t2
+	ADCQ acc4, t3
+	
 	sm2P256SqrReductionInternal()
 
 	RET