<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [llvm-mca] Optionally add code comments to llvm-mca reports"
   href="https://bugs.llvm.org/show_bug.cgi?id=51132">51132</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[llvm-mca] Optionally add code comments to llvm-mca reports
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>tools
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Windows NT
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>llvm-mca
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>llvm-dev@redking.me.uk
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>andrea.dibiagio@gmail.com, llvm-bugs@lists.llvm.org, matthew.davis@sony.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre><a href="https://llvm.godbolt.org/z/8Po4eeccq">https://llvm.godbolt.org/z/8Po4eeccq</a>

Under some circumstances it'd be useful if llvm-mca could annotate standard
assembly code comments to the report. We can see these from clang asm output
(although they then get stripped by llvm-mca), but when we're analyzing raw asm
or gcc/msvc code then not everyone can perform shuffle decodes in their
heads.....

Shuffle decodes are the most useful to me, but I see no reason why they
shouldn't work with all comments. But it should be an opt-in feature as in many
cases it's just extra noise.

Not sure about json output - should the comment be put in a separate field?

Instruction Info:
[1]: #uOps
[2]: Latency
[3]: RThroughput
[4]: MayLoad
[5]: MayStore
[6]: HasSideEffects (U)

[1]    [2]    [3]    [4]    [5]    [6]    Instructions:
 1      1     0.50                        pshufd $0, %xmm0, %xmm0 ##
xmm0[0,0,0,0]


Resource pressure by instruction:
[0]    [1]    [2]    [3]    [4]    [5]    [6]    [7]    [8]    [9]    [10]  
[11]   [12]   [13]   Instructions:
 -      -      -      -      -     0.50   0.50    -      -      -      -    
0.50   0.50    -     pshufd $0, %xmm0, %xmm0 ## xmm0[0,0,0,0]</pre>
        </div>
      </p>


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