<html>
    <head>
      <base href="http://llvm.org/bugs/" />
    </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 --- - SourceMgr.cpp:191: valgrind problem"
   href="http://llvm.org/bugs/show_bug.cgi?id=19930">19930</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>SourceMgr.cpp:191: valgrind problem
          </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>Linux
          </td>
        </tr>

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

        <tr>
          <th>Severity</th>
          <td>normal
          </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>dcb314@hotmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=12596" name="attach_12596" title="C source code">attachment 12596</a> <a href="attachment.cgi?id=12596&action=edit" title="C source code">[details]</a></span>
C source code

I tried to compile the attached code under valgrind
with trunk dated 20140601 and it said

==17140== Conditional jump or move depends on uninitialised value(s)
==17140==    at 0x25D63DA: llvm::SourceMgr::GetMessage(llvm::SMLoc,
llvm::SourceMgr::DiagKind, llvm::Twine const&, llvm::ArrayRef<llvm::SMRange>,
llvm::ArrayRef<llvm::SMFixIt>) const (SourceMgr.cpp:191)
==17140==    by 0x25D67B6: llvm::SourceMgr::PrintMessage(llvm::raw_ostream&,
llvm::SMLoc, llvm::SourceMgr::DiagKind, llvm::Twine const&,
llvm::ArrayRef<llvm::SMRange>, llvm::ArrayRef<llvm::SMFixIt>, bool) const
(SourceMgr.cpp:218)
==17140==    by 0x25D6B34: llvm::SourceMgr::PrintMessage(llvm::SMLoc,
llvm::SourceMgr::DiagKind, llvm::Twine const&, llvm::ArrayRef<llvm::SMRange>,
llvm::ArrayRef<llvm::SMFixIt>, bool) const (SourceMgr.cpp:238)
==17140==    by 0x1EAE224: (anonymous namespace)::AsmParser::Error(llvm::SMLoc,
llvm::Twine const&, llvm::ArrayRef<llvm::SMRange>) (AsmParser.cpp:305)

SourceMgr.cpp:191 is

      if (R.Start.getPointer() > LineEnd || R.End.getPointer() < LineStart)
        continue;</pre>
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