Updated Golang ppc64 asm Reference (markdown)

Golang-ppc64-asm-Reference.md

@@ -34,5 +34,41 @@
 ```
 
 ## 算术乘法
+乘法太复杂：  
+```asm
+// The following macros are used to implement the ppc64le
+// equivalent function from the corresponding s390x
+// instruction for vector multiply high, low, and add,
+// since there aren't exact equivalent instructions.
+// The corresponding s390x instructions appear in the
+// comments.
+// Implementation for big endian would have to be
+// investigated, I think it would be different.
+//
+//
+// Vector multiply word
+//
+//	VMLF  x0, x1, out_low
+//	VMLHF x0, x1, out_hi
+#define VMULT(x1, x2, out_low, out_hi) \
+	VMULEUW x1, x2, TMP1; \
+	VMULOUW x1, x2, TMP2; \
+	VMRGEW TMP1, TMP2, out_hi; \
+	VMRGOW TMP1, TMP2, out_low
 
+//
+// Vector multiply add word
+//
+//	VMALF  x0, x1, y, out_low
+//	VMALHF x0, x1, y, out_hi
+#define VMULT_ADD(x1, x2, y, one, out_low, out_hi) \
+	VMULEUW  y, one, TMP2; \
+	VMULOUW  y, one, TMP1; \
+	VMULEUW  x1, x2, out_low; \
+	VMULOUW  x1, x2, out_hi; \
+	VADDUDM  TMP2, out_low, TMP2; \
+	VADDUDM  TMP1, out_hi, TMP1; \
+	VMRGOW   TMP2, TMP1, out_low; \
+	VMRGEW   TMP2, TMP1, out_hi
+```