<div dir="rtl"><div dir="ltr">Although I just posted how windows.h is not required, in this copy it was still included.</div><div dir="ltr">So I repeated all measurments exactly using the ptime utility to get more accurate times for all combinations. The compiled code was:</div>
<div dir="ltr"><br></div><div dir="ltr"><div dir="ltr"><font face="courier new, monospace">#include <iostream></font></div><div dir="ltr"><font face="courier new, monospace"><br></font></div><div dir="ltr"><font face="courier new, monospace">int main() {</font></div>
<div dir="ltr"><font face="courier new, monospace"> std::cout<<"hello cout\n";</font></div><div dir="ltr"><font face="courier new, monospace"> return 0;</font></div><div dir="ltr"><font face="courier new, monospace">}</font></div>
<div><br></div></div><div dir="ltr">I repeated every run few times and got consistent results. Here are the results:</div><div dir="ltr"><br></div><div dir="ltr"><img src="cid:ii_1417c31410675a32" alt="תמונה מוטבעת 1"><br>
</div><div class="gmail_extra"><div dir="ltr"><br>* clang is about 50% slower than gcc for all three cases.</div><div dir="ltr">* Windows.h doubles compilation time and not required. Remove it out asap!</div><div dir="ltr">
* Even w/o windows.h, libcxx compilation time is twice the libstdc++ compilation time with either compiler.</div><div dir="ltr">* Comparing each compiler with its own library, clang+libcxx compilation is three times as much slower as gcc+libstdc++.</div>
<div dir="ltr"><br></div><div dir="ltr">That's quite a difference not in our favor.</div><div dir="ltr"><br></div><div dir="ltr">Yaron<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br><div class="gmail_quote">
2013/10/3 Nico Weber <span dir="ltr"><<a href="mailto:thakis@chromium.org" target="_blank">thakis@chromium.org</a>></span><br><blockquote class="gmail_quote" style="margin:0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;border-right-width:1px;border-right-color:rgb(204,204,204);border-right-style:solid;padding-left:1ex;padding-right:1ex">
<div class="im">On Wed, Oct 2, 2013 at 2:36 PM, Jean-Daniel Dupas <span dir="ltr"><<a href="mailto:devlists@shadowlab.org" target="_blank">devlists@shadowlab.org</a>></span> wrote:<br></div><div class="gmail_extra">
<div class="gmail_quote"><div class="im">
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div style="word-wrap:break-word">support.h includes windows.h on win32 platform.<div>
Does libstdc++ also include windows.h. I think this single include may be enough to explain the difference.</div></div></blockquote><div><br></div></div><div>It's a problem on Mac (and probably Linux) as well, <a href="http://llvm.org/PR14587" target="_blank">http://llvm.org/PR14587</a> , so maybe it's not just windows.h.</div>
<div><br></div><div>Looking forward to modules!</div><div class="im"><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div style="word-wrap:break-word"><div><div><br><div><br><div><div>Le 2 oct. 2013 à 22:19, Yaron Keren <<a href="mailto:yaron.keren@gmail.com" target="_blank">yaron.keren@gmail.com</a>> a écrit :</div><div><div>
<br><blockquote type="cite"><div dir="rtl"><div dir="ltr">Thanks, I see that now. It wasn't trivial for me...</div><div dir="ltr"><br></div><div dir="ltr">How can we understand why compiling the trivial program with libcxx is 3x slower vs with libstcd++ ?</div>
<div dir="ltr"><br></div><div dir="ltr">Yaron</div><div dir="ltr"><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote"><div dir="ltr">2013/10/2 Joerg Sonnenberger <span dir="ltr"><<a href="mailto:joerg@britannica.bec.de" target="_blank">joerg@britannica.bec.de</a>></span></div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div>On Wed, Oct 02, 2013 at 06:45:06PM +0300, Yaron Keren wrote:<br>
> Joerg, I am ashmed to admit I have re-read the code and still can not<br>
> understand how basic_string uses tuple. How basic_string uses tuple?<br>
<br>
</div>basic_string -> __compressed_pair -> __libcpp_compressed_pair_imp<br>
-> tuple.<br>
<div><div><br>
Joerg<br>
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