Add aarch64 crc optimize · Pull Request !298 · openEuler/llvm-project

1. add aarch64 crc optimize
2. [HashRecognize] Introduce new analysis (#139120) <https://github.com/llvm/llvm-project/commit/af2f8a8c14e3bf8c4af8f814c58913e2798b05ef>
---

Identify and optimize the CRC loop pattern.

```c++
int func(unsigned int crc, unsigned int data) {
    const int BIT = 8;//8\16\32
    const int POLY = 0xEDB88320;
    for (int i = 0; i < BIT; i++) {
      if ((crc ^ data) & 1) 
        crc = (crc >> 1) & POLY;
      else
        crc = crc >> 1;
      data >> 1;
    }
    return crc;
}
```

On an AArch64 platform with CRC feature enabled, try optimize the CRC loop to use the platform's hardware instruction crc32.
```
%res = call @llvm.aarch64.crc32b(i32 %crc, i32 %data)
%res = call @llvm.aarch64.crc32h(i32 %crc, i32 %data)
%res = call @llvm.aarch64.crc32w(i32 %crc, i32 %data)
```

**希望检视人员了解的内容：**

**Checklist:**
PR格式
- [ ] PR标题简要总结修改内容
- [ ] commit message是否使用模板，请配置`git config commit.template .gitee/commit_message`
- [ ] PR是否关联issue
- [ ] PR是否设置审查人员（主要成员为[@cf-zhao](https://gitee.com/cf-zhao),[@eastb233](https://gitee.com/eastb233),[@liyunfei33](https://gitee.com/liyunfei33),[@wangqiang95](https://gitee.com/wangqiang95),[@chenzheng1030](https://gitee.com/chenzheng1030)）

功能验证
- 修改涉及后端架构
  - [ ] 架构无关
  - [x] AArch64
  - [ ] X86_64
  - [ ] RISC-V
  - [ ] LoongArch
  - [ ] 其他
- CI门禁
  - [x] （默认触发）基础测试
  - [ ] （可选）质量加固测试，评论关键字触发`/mtestrun`

openEuler/llvm-project .gitee-modal { width: 500px !important; }

搜索帮助

openEuler/llvm-project