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<base href="http://llvm.org/bugs/" />
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<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>
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<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>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<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>
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