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Updated Golang ppc64 asm Reference (markdown)

Sun Yimin 2024-08-27 11:02:31 +08:00
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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
```