http://llvm.org/bugs/show_bug.cgi?id=14555
Bug #: 14555
Summary: libc++'s hash_set is 44% slower than libstdc++'s
Product: libc++
Version: unspecified
Platform: PC
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: All Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
This is like bug 14554 but for hash_set instead of map:
/*
$ clang++ -o s151_hash sec151_stlunorderedmap.cpp -O2 -stdlib=libc++
$ time ./s151_hash < ~/Downloads/bible11.txt > /dev/null
real 0m0.424s
user 0m0.418s
sys 0m0.005s
$ clang++ -o s151_hash sec151_stlunorderedmap.cpp -O2
$ time ./s151_hash < ~/Downloads/bible11.txt > /dev/null
real 0m0.294s
user 0m0.288s
sys 0m0.005s
*/
#include <iostream>
#include <string>
// hash_map instead of unordered_map to compare to gcc4.2
#pragma clang diagnostic ignored "-W#warnings"
#include <ext/hash_map>
using __gnu_cxx::hash_map;
using namespace std;
namespace __gnu_cxx {
template<>
struct hash<std::string> {
size_t operator()(const std::string& s) const {
return hash<const char*>()(s.c_str());
}
};
}
int main(void)
{ hash_map<string, int> M;
hash_map<string, int>::iterator j;
string t;
while (cin >> t)
M[t]++;
for (j = M.begin(); j != M.end(); ++j)
cout << j->first << " " << j->second << "\n";
return 0;
}
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