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List:       llvm-bugs
Subject:    [llvm-bugs] [Bug 92891] AMDGPU Benchmark Regression: Increased Assembler Length After Commit 54ec8bc
From:       LLVM Bugs via llvm-bugs <llvm-bugs () lists ! llvm ! org>
Date:       2024-05-21 10:21:10
Message-ID: 20240521102110.0fd4d9e382ba0b76 () email ! llvm ! org
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<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/92891>92891</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            AMDGPU Benchmark Regression: Increased Assembler Length After Commit \
54ec8bcaf85e  </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          michaelselehov
      </td>
    </tr>
</table>

<pre>
    **Summary**
After the commit 54ec8bcaf85e3a3341c97640331d58e24ac0d2cd one of the AMDGPU \
benchmarks regressed because the assembler became longer.

**Reduced Input IR**
See input.ll in the attached archive

**Steps to Reproduce**
* Run opt with these parameters:
opt -mtriple=amdgcn-amd-amdhsa -mcpu=gfx908 -O3 -vectorize-loops -vectorize-slp \
-amdgpu-early-inline-all=true -amdgpu-function-calls=false -S -o output.ll input.ll

* Then run llc with these parameters:
llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx908 -O3 -vectorize-loops -vectorize-slp \
-amdgpu-early-inline-all=true -amdgpu-function-calls=false -o output.s output.ll

**Additional Information**
The input IR includes a complicated set of binary operations. The commit tries to \
fold the instructions but instead produces extra code, leading to the regression.

Please find the attachments for detailed comparison and further analysis.

[input and output.zip](https://github.com/llvm/llvm-project/files/15388366/input.and.output.zip)


</pre>
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