<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=http://email.email.llvm.org/c/eJylk82umzAQhZ_GbEYgY8gPCxb3Nuq2m76AwQO4cmxkD8lNnr6GJBeUXVUJw4yPz8fIYzdO3erWSNtD686jNuhBOZBXeYOrpgFoQNC201YTgnFuhMni14gtoTI3kB1FhxtJn-WdtLMPV_orZ-IH4yfGPwIiKCSpzUMbiMbAig8mfsanb9usd6pxhjLn-zhzjwPx6-jvv6v7A_F4p2kKhIGyFmKYbiVtCQJJT62zihWfzz-TJN3CLJ5vF-mBFSfIv-XVepbaMnG8OK2YqJ7q4bkMVvIbAEB30ZbP07OyVvCCAGww8E7iGxI7nF7hdYhtmLkzZl3hkSZvN6ZvS6LqQlVFJRM50eB8felU1yWTN_XbZsf9n5osdjomxlxen3T07k9saUx1CBOGGOxEdRDJUHcFcsyl2POqRdUc86bj7b4su0OT56osEyMbNKFmu08mhMUrLIgYs90p-f8KdC24EDznZRz74pgdi7JoJEZRVhXPG1ZyjA002cyZz1Di6wXZTH2IotGBwirKEHRvEZeCY4WkySzJ5hDH-X-5BclScr3U-xfozARc>52972</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [optimaztion] do away with the infinite loop unexpectedly
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

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

<pre>
    clang compiler do away with the infinite loop unexpectedly after optimaztion with -O1,
see detail with https://gcc.godbolt.org/z/eex8rzT9z

--- test.c ----

int startcond;
static int myvar = 1;

int main(void)
{
  startcond = 1;
  if(1 == startcond)
  {
     startcond = 0;
  }
  while(1);
  return 0;
}

</pre>
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