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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missing bswap"
href="https://bugs.llvm.org/show_bug.cgi?id=47191">47191</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Missing bswap
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Common Code Generator Code
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>david.bolvansky@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>64-bit cases:
#include <stdint.h>
#include <cstddef>
uint64_t problem1(uint64_t input) {
return (((input & 0xFF00000000000000ULL) >> 56) +
((input & 0x00FF000000000000ULL) >> 40) +
((input & 0x0000FF0000000000ULL) >> 24) +
((input & 0x000000FF00000000ULL) >> 8) +
((input & 0x00000000000000FFULL) << 56) +
((input & 0x000000000000FF00ULL) << 40) +
((input & 0x0000000000FF0000ULL) << 24) +
((input & 0x00000000FF000000ULL) << 8));
}
uint64_t problem2(uint64_t input) {
return (((input >> 56) & 0x00000000000000FFULL) ^
((input >> 40) & 0x000000000000FF00ULL) ^
((input >> 24) & 0x0000000000FF0000ULL) ^
((input >> 8) & 0x00000000FF000000ULL) ^
((input << 56) & 0xFF00000000000000ULL) ^
((input << 40) & 0x00FF000000000000ULL) ^
((input << 24) & 0x0000FF0000000000ULL) ^
((input << 8) & 0x000000FF00000000ULL));
}
uint64_t problem3(uint64_t input) {
return (((input & 0xFF00000000000000ULL) >> 56) ^
((input & 0x00FF000000000000ULL) >> 40) ^
((input & 0x0000FF0000000000ULL) >> 24) ^
((input & 0x000000FF00000000ULL) >> 8) ^
((input & 0x00000000000000FFULL) << 56) ^
((input & 0x000000000000FF00ULL) << 40) ^
((input & 0x0000000000FF0000ULL) << 24) ^
((input & 0x00000000FF000000ULL) << 8));
}
uint64_t problem4(uint64_t input) {
return (((input >> 56) & 0x00000000000000FFULL) +
((input << 56) & 0xFF00000000000000ULL) +
((input >> 40) & 0x000000000000FF00ULL) +
((input << 40) & 0x00FF000000000000ULL) +
((input >> 24) & 0x0000000000FF0000ULL) +
((input << 24) & 0x0000FF0000000000ULL) +
((input >> 8) & 0x00000000FF000000ULL) +
((input << 8) & 0x000000FF00000000ULL));
}
<a href="https://godbolt.org/z/vzznPz">https://godbolt.org/z/vzznPz</a></pre>
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