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Updated Golang s390x asm Reference (markdown)

Sun Yimin 2024-08-22 09:27:51 +08:00
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Golang-s390x-asm-Reference.md

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# Reference
* https://go.dev/doc/asm
- https://go.dev/doc/asm
IBM z/Architecture, a.k.a. s390x[](https://go.dev/doc/asm#s390x)
The registers R10 and R11 are reserved. The assembler uses them to hold temporary values when assembling some instructions.
@ -18,27 +18,29 @@ Addressing modes:
(R5)(R6*1): The location at R5 plus R6. It is a scaled mode as on the x86, but the only scale allowed is 1.
* https://golang.google.cn/cmd/internal/obj/s390x/
- https://golang.google.cn/cmd/internal/obj/s390x/
# 向量指令
## Reference
* https://github.com/golang/go/blob/master/src/cmd/internal/obj/s390x/vector.go
- https://github.com/golang/go/blob/master/src/cmd/internal/obj/s390x/vector.go
## Element Size
* B - 16个8位值 （相当于一个128位数）
* H - 8个16位值
* F -
* G -
* Q - 2个64位值?
- **B** - This stands for Byte and represents multiple 8-bit values in a 128-bit vector.
- **H** - This stands for Halfword and represents multiple 16-bit values in a 128-bit vector.
- **F** - This stands for Fullword and represents multiple 32-bit values in a 128-bit vector.
- **G** - This stands for Doubleword and represents multiple 64-bit values in a 128-bit vector.
- **Q** - This stands for Quadword and represents a single 128-bit value in a 128-bit vector.
(以上解释来自Copilot)
## 算术加减法
* VA - Vector Add. 无符号数加法。
* VAC - Vector Add With Carry. 带进位无符号数加法；相当于3个数加法。
* VACC - Vector Add Compute Carry. 无符号数加法，计算进位。只有进位结果。
* VACCC - Vector Add With Carry Compute Carry. 带进位无符号数加法，计算进位。相当于3个数加法，只有进位结果。
- VA - Vector Add. 无符号数加法。
- VAC - Vector Add With Carry. 带进位无符号数加法；相当于3个数加法。
- VACC - Vector Add Compute Carry. 无符号数加法，计算进位。只有进位结果。
- VACCC - Vector Add With Carry Compute Carry. 带进位无符号数加法，计算进位。相当于3个数加法，只有进位结果。
所以，两个数相加要同时使用多个指令。示例演示T1||T0, RED2||RED1两个256位数的加法（按64位值?），得到 T2||T1||T0。
所以，两个数相加要同时使用多个指令。示例演示T1||T0, RED2||RED1两个256位数的加法，得到 T2||T1||T0。
```asm
VACCQ T0, RED1, CAR1
VAQ T0, RED1, T0