http://llvm.org/bugs/show_bug.cgi?id=14554
Bug #: 14554
Summary: libc++'s map is 37% slower than libstdc++'s from
gcc4.2
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
I'm running one of the programs from
http://www.cs.bell-labs.com/cm/cs/pearls/sec151.html with this input file
http://www.gutenberg.org/files/30/old/bible11.txt
This is with Xcode
The program takes 0.4s with Xcode 4.5.2's clang and libstdc++, but 0.56s with
libc++:
/*
$ clang++ -o s151_map sec151_stlmap.cpp -O2
$ time ./s151_map < ~/Downloads/bible11.txt > /dev/null
real 0m0.403s
user 0m0.396s
sys 0m0.006s
$ clang++ -o s151_map sec151_stlmap.cpp -O2 -stdlib=libc++
$ time ./s151_map < ~/Downloads/bible11.txt > /dev/null
real 0m0.557s
user 0m0.548s
sys 0m0.005s
*/
#include <iostream>
#include <map>
#include <string>
using namespace std;
int main(void)
{ map<string, int> M;
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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