<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 --- - Clang spends too much time in clang::Sema::ArgumentDependentLookup after r186040"
   href="http://llvm.org/bugs/show_bug.cgi?id=16597">16597</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Clang spends too much time in clang::Sema::ArgumentDependentLookup after r186040
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </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>Frontend
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>glider@google.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu, richard-llvm@metafoo.co.uk
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>It takes infinite time for Clang r186040 to compiler the attached file with the
following flags:

$ clang ImageDocument.ii -c  -w -std=gnu++11

r186039 works just fine.

According to perf, most of the time is spent in
clang::Sema::ArgumentDependentLookup():

 83.18%  clang-3.3  clang-3.3            [.]
clang::Sema::ArgumentDependentLookup(clang::DeclarationName, bool,
clang::SourceLocation, llvm::ArrayRef<clang::Expr*>, clang::ADLResult&)
 15.83%  clang-3.3  clang-3.3            [.]
clang::FunctionDecl::getPreviousDeclImpl()</pre>
        </div>
      </p>
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