<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/80957>80957</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [llvm-exegesis] Middle half repetition mode test flaky
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            tools:llvm-exegesis,
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
            boomanaiden154
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          boomanaiden154
      </td>
    </tr>
</table>

<pre>
    The middle half repetition mode test is flaky on the buildbots that run it (https://lab.llvm.org/buildbot/#/builders/258/builds/13464):
```
******************** TEST 'LLVM :: tools/llvm-exegesis/X86/latency/middle-half.s' FAILED ********************
Exit Code: 1
Command Output (stderr):
--
RUN: at line 5: /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/stage1/bin/llvm-exegesis -mtriple=x86_64-unknown-unknown -mode=latency -opcode-name=ADD64rr -repetition-mode=middle-half-duplicate | /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/stage1/bin/FileCheck /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/llvm/llvm/test/tools/llvm-exegesis/X86/latency/middle-half.s
+ /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/stage1/bin/FileCheck /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/llvm/llvm/test/tools/llvm-exegesis/X86/latency/middle-half.s
+ /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/stage1/bin/llvm-exegesis -mtriple=x86_64-unknown-unknown -mode=latency -opcode-name=ADD64rr -repetition-mode=middle-half-duplicate
RUN: at line 6: /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/stage1/bin/llvm-exegesis -mtriple=x86_64-unknown-unknown -mode=latency -opcode-name=ADD64rr -repetition-mode=middle-half-loop | /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/stage1/bin/FileCheck /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/llvm/llvm/test/tools/llvm-exegesis/X86/latency/middle-half.s
+ /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/stage1/bin/FileCheck /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/llvm/llvm/test/tools/llvm-exegesis/X86/latency/middle-half.s
+ /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/stage1/bin/llvm-exegesis -mtriple=x86_64-unknown-unknown -mode=latency -opcode-name=ADD64rr -repetition-mode=middle-half-loop
/localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/llvm/llvm/test/tools/llvm-exegesis/X86/latency/middle-half.s:8:10: error: CHECK: expected string not found in input
# CHECK: - { key: latency, value: {{[0-9.]*}}, per_snippet_value: {{[0-9.]*}}
 ^
<stdin>:1:1: note: scanning from here
---
^
<stdin>:14:2: note: possible intended match here
 - { key: latency, value: -0.0024, per_snippet_value: -0.0024, validation_counters: {} }
 ^
Input file: <stdin>
Check file: /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/llvm/llvm/test/tools/llvm-exegesis/X86/latency/middle-half.s
-dump-input=help explains the following input dump.
Input was:
<<<<<<
           1: --- 
check:8'0     X~~~ error: no match found
           2: mode: latency 
check:8'0     ~~~~~~~~~~~~~~
           3: key: 
check:8'0 ~~~~~
           4:  instructions: 
check:8'0 ~~~~~~~~~~~~~~~
           5:  - 'ADD64rr R11 R11 RSI' 
check:8'0 ~~~~~~~~~~~~~~~~~~~~~~~~~
           6:  config: '' 
check:8'0 ~~~~~~~~~~~~
           .
           .
           .
           9: - 'RSI=0x0' 
check:8'0     ~~~~~~~~~~~~~
          10: cpu_name: cascadelake 
check:8'0     ~~~~~~~~~~~~~~~~~~~~~~
          11: llvm_triple: x86_64-unknown-unknown 
check:8'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          12: min_instructions: 10000 
check:8'0     ~~~~~~~~~~~~~~~~~~~~~~~~
          13: measurements: 
check:8'0     ~~~~~~~~~~~~~~
          14:  - { key: latency, value: -0.0024, per_snippet_value: -0.0024, validation_counters: {} } 
check:8'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
check:8'1 ? possible intended match
          15: error: '' 
check:8'0     ~~~~~~~~~~
          16: info: Repeating a single implicitly serial instruction 
check:8'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          17: assembled_snippet: 49BB000000000000000048BE000000000000000049B8020000000000000066904901F34901F34983C0FF75F4C349BB000000000000000048BE000000000000000049B8020000000000000066904901F34901F34983C0FF75F4C3 
check:8'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 18: ... 
check:8'0 ~~~~
>>>>>>
--
********************
```

Seems like the negative sign is throwing off the check line. Probably will throw up a quick fix (like setting a retry count) to fix this, but this shouldn't be occurring in the first place and more debugging there will be needed.
</pre>
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