Sign bit handling error

[fly-1011]

Before start

• [X] I have read the RISC-V ISA Manual and this is not a RISC-V ISA question. 我已经阅读过 RISC-V 指令集手册，这不是一个指令集本身的问题。
• [X] I have read the XiangShan Documents. 我已经阅读过香山文档。
• [X] I have searched the previous issues and did not find anything relevant. 我已经搜索过之前的 issue，并没有找到相关的。
• [X] I have reviewed the commit messages from the relevant commit history. 我已经浏览过相关的提交历史和提交信息。

Describe the bug

When executing fadd.h ft0, fa0, fa0 instruction, the value of fa0 is 0xffffffffffff8000 (-0.0 in half precision format), and the results of Xiangshan and nemu are different.

Expected behavior

Log information：

The log information of spike is also shown above

To Reproduce

Initialize fa0: 0xffffffffffff8000 Execute fadd.h ft0, fa0, fa0

Environment

• XiangShan branch:
• XiangShan commit id: b00d5822032eadad2744fcfc0a8c03fa011ff81c (HEAD -> master, origin/master, origin/HEAD)
• NEMU commit id:
• SPIKE commit id: ready-to-run:457f091898b2bcd26c8f6e983f3df174f990af43 (HEAD -> master, origin/master, origin/HEAD)

Additional context

No response

[HeiHuDie]

Thanks, this is a known bug and has been fixed, but it has not been merged into master

[fly-1011]

Thank you for your reply. Thanks to your reminder, I noticed that the fix has been made in the yunsuan module, but it hasn't been merged into Xiangshan yet. I’m looking forward to the merge!😄