diff --git a/SM4性能优化.md b/SM4性能优化.md
index 86f4cd7..910f314 100644
--- a/SM4性能优化.md
+++ b/SM4性能优化.md
@@ -165,3 +165,37 @@ Golang没提供这两种模式的优化接口，可能这两种模式不怎么
     BenchmarkSM4GCMSeal8K-6      	   36162	     33197 ns/op	 246.77 MB/s	       0 B/op	       0 allocs/op
     BenchmarkAESGCMOpen8K-6      	  944479	      1325 ns/op	6183.50 MB/s	       0 B/op	       0 allocs/op
     BenchmarkSM4GCMOpen8K-6      	   36162	     33197 ns/op	 246.77 MB/s	       0 B/op	       0 allocs/op
+
+AES 128的加密代码(amd64), 没有32轮loop，这种性能差别也不奇怪
+
+    // func encryptBlockAsm(nr int, xk *uint32, dst, src *byte)
+    TEXT ·encryptBlockAsm(SB),NOSPLIT,$0
+	MOVQ xk+8(FP), AX
+	MOVQ dst+16(FP), DX
+	MOVQ src+24(FP), BX
+	MOVUPS 0(AX), X1
+	MOVUPS 0(BX), X0
+	ADDQ $16, AX
+	PXOR X1, X0
+	MOVUPS 0(AX), X1
+	AESENC X1, X0
+	MOVUPS 16(AX), X1
+	AESENC X1, X0
+	MOVUPS 32(AX), X1
+	AESENC X1, X0
+	MOVUPS 48(AX), X1
+	AESENC X1, X0
+	MOVUPS 64(AX), X1
+	AESENC X1, X0
+	MOVUPS 80(AX), X1
+	AESENC X1, X0
+	MOVUPS 96(AX), X1
+	AESENC X1, X0
+	MOVUPS 112(AX), X1
+	AESENC X1, X0
+	MOVUPS 128(AX), X1
+	AESENC X1, X0
+	MOVUPS 144(AX), X1
+	AESENCLAST X1, X0
+	MOVUPS X0, 0(DX)
+	RET
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