<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 --- - Register clobber information for asm blocks jumped to can be incorrect"
   href="http://llvm.org/bugs/show_bug.cgi?id=21035">21035</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Register clobber information for asm blocks jumped to can be incorrect
          </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>All
          </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>ehsan@mozilla.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>Consider this test case:

void f() {
  __asm {
    mov edx, 1
    jmp lbl
  }
  __asm {
lbl:
    mov ecx, 2
  }
}

We currently generate the following code:

define void @f() #0 {
entry:
  tail call void asm sideeffect inteldialect "mov edx, $$1\0A\09jmp
L__MSASMLABEL_.0__lbl", "~{edx},~{dirflag},~{fpsr},~{flags}"() #1, !srcloc !5
  tail call void asm sideeffect inteldialect "L__MSASMLABEL_.0__lbl:\0A\09mov
ecx, $$2", "~{ecx},~{dirflag},~{fpsr},~{flags}"() #1, !srcloc !6
  ret void
}

However, the second asm block also clobbers edx, through the jump from the
first one.</pre>
        </div>
      </p>
      <hr>
      <span>You are receiving this mail because:</span>
      
      <ul>
          <li>You are on the CC list for the bug.</li>
      </ul>
    </body>
</html>