<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 - [debugify] simplifycfg fail"
   href="https://bugs.llvm.org/show_bug.cgi?id=37961">37961</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[debugify] simplifycfg fail
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>new-bugs
          </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>new bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>greg.bedwell@sony.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>anastasis.gramm2@gmail.com, davide@freebsd.org, llvm-bugs@lists.llvm.org, vsk@apple.com
          </td>
        </tr>

        <tr>
          <th>Blocks</th>
          <td>37953
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=20479" name="attach_20479" title="ll reproducer">attachment 20479</a> <a href="attachment.cgi?id=20479&action=edit" title="ll reproducer">[details]</a></span>
ll reproducer

$ clang -v
clang version 7.0.0 (trunk 335708) (llvm/trunk 335721)
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: e:\work\upstream-llvm\build-vs2015-native-ninja\bin

$ cat simplify_the_cfg.cpp
void foo(int bar, int baz) {
  for (;; bar++)
    for (; bar; bar++)
      if (baz)
        ;
}

$ clang simplify_the_cfg.cpp -O0 -Xclang -disable-O0-optnone -S -emit-llvm -o -
| opt -simplifycfg -instcombine -S -o simplifycfg-input.ll

$ opt simplifycfg-input.ll -disable-output -debugify-each -simplifycfg
ERROR: Instruction with empty DebugLoc in function ?foo@@YAXHH@Z --  %0 = load
i32, i32* %bar.addr, align 4, !dbg !30
ERROR: Instruction with empty DebugLoc in function ?foo@@YAXHH@Z --  %inc4 =
add nsw i32 %0, 1, !dbg !30
WARNING: Missing line 9
WARNING: Missing line 10
WARNING: Missing line 11
WARNING: Missing line 12
WARNING: Missing line 13
WARNING: Missing line 14
WARNING: Missing variable 5
WARNING: Missing variable 6
WARNING: Missing variable 7
WARNING: Missing variable 8
CheckFunctionDebugify [Simplify the CFG]: FAIL
CheckFunctionDebugify [Module Verifier]: PASS

$</pre>
        </div>
      </p>

        <div id="referenced">
          <hr style="border: 1px dashed #969696">
          <b>Referenced Bugs:</b>
          <ul>
              <li>
                [<a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [meta] [debugify] fix -check-debugify failures"
   href="https://bugs.llvm.org/show_bug.cgi?id=37953">Bug 37953</a>] [meta] [debugify] fix -check-debugify failures
              </li>
          </ul>
        </div>
        <br>

      <hr>
      <span>You are receiving this mail because:</span>

      <ul>
          <li>You are on the CC list for the bug.</li>
      </ul>
    </body>
</html>