<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 --- - Tautological constant deduction is incorrect"
   href="http://llvm.org/bugs/show_bug.cgi?id=21794">21794</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Tautological constant deduction is 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>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>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>pavol@klacansky.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>This simple program causes false warning during compilation.

#include <stdint.h>
#include <stdio.h>


int
main(void)
{
    uint16_t a = 13;
    printf("%d\n", a != ~0);
    return 0;
}


test.c:9:22: warning: comparison of constant -1 with expression of type
'uint16_t'
      (aka 'unsigned short') is always true
      [-Wtautological-constant-out-of-range-compare]
    printf("%d\n", a != ~0);</pre>
        </div>
      </p>
      <hr>
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      <ul>
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