<html>
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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 - Simple loop with IO - LLVM much slower than GCC"
href="https://bugs.llvm.org/show_bug.cgi?id=47321">47321</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Simple loop with IO - LLVM much slower than GCC
</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>Loop Optimizer
</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>Code:
#include <string>
#include <map>
#include <fstream>
#include <iostream>
int main(int argc, char **argv) {
if (argc != 2)
return 1;
std::string dict = argv[1];
std::map<unsigned, unsigned> pwd_dist;
std::ifstream file(dict);
if (!file.is_open())
return 1;
std::string line;
while (getline(file, line)) {
unsigned pwd_len = line.length();
pwd_dist[pwd_len] += 1;
}
file.close();
for (std::map<unsigned, unsigned>::iterator it = pwd_dist.begin();
it != pwd_dist.end(); it++) {
std::cout << it->first // string (key)
<< ':' << it->second ;// string's value
if (std::next(it) != pwd_dist.end())
std::cout << ';';
}
return 0;
}
Compiled with -O3.
Clang:
0m1,219s
GCC:
0m0,623s</pre>
</div>
</p>
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