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<base href="https://bugs.dpdk.org/">
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<body><table border="1" cellspacing="0" cellpadding="8" class="bz_new_table">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_UNCONFIRMED "
title="UNCONFIRMED - lpm: undefined right shift"
href="https://bugs.dpdk.org/show_bug.cgi?id=1587">1587</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>lpm: undefined right shift
</td>
</tr>
<tr>
<th>Product</th>
<td>DPDK
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>UNCONFIRMED
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>Normal
</td>
</tr>
<tr>
<th>Component</th>
<td>other
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dev@dpdk.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>stephen@networkplumber.org
</td>
</tr>
<tr>
<th>Target Milestone</th>
<td>---
</td>
</tr></table>
<p>
<div class="bz_comment_block">
<pre class="bz_comment_text">Both rte_lpm.c and rte_lpm6.c are using >> operator on a negative integer.
According to the C standard the result of that is implementation defined (ie
not portable).
Reported by PVS studio as warning:
<a href="https://pvs-studio.com/en/docs/warnings/v610/">https://pvs-studio.com/en/docs/warnings/v610/</a>
static uint32_t __rte_pure
depth_to_mask(uint8_t depth)
{
VERIFY_DEPTH(depth);
/* To calculate a mask start with a 1 on the left hand side and right
* shift while populating the left hand side with 1's
*/
return (int)0x80000000 >> (depth - 1);
}
and
static uint8_t __rte_pure
depth_to_mask_1b(uint8_t depth)
{
/* To calculate a mask start with a 1 on the left hand side and right
* shift while populating the left hand side with 1's
*/
return (signed char)0x80 >> (depth - 1);
}
</pre>
</div>
</p>
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