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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - static_cast<int16_t>(51200.0f) returns unpredictable value"
href="https://bugs.llvm.org/show_bug.cgi?id=33448">33448</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>static_cast<int16_t>(51200.0f) returns unpredictable value
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>vince@nethacker.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>clang version 5.0.0 (trunk 304006)
Target: x86_64-unknown-linux-gnu
Thread model: posix
#include <iostream>
int main() {
std::cout << static_cast<int16_t>(51200) << std::endl;
std::cout << static_cast<int16_t>(51200.0f) << std::endl;
return 0;
}
$ clang++ -std=c++14 static_cast.cpp && ./a.out
-14336
12160
$ clang++ -std=c++11 static_cast.cpp && ./a.out
-14336
-16512
#include <iostream>
int main() {
std::cout << static_cast<int16_t>(51200.0f) << std::endl;
return 0;
}
$ clang++ -std=c++11 static_cast.cpp && ./a.out
2176
$ g++ -std=c++11 static_cast.cpp && ./a.out
32767
$ g++ --version
g++ (Ubuntu 4.8.4-2ubuntu1~14.04.3) 4.8.4
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.</pre>
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