<div dir="ltr">It means using PGO with -O2 and above (including -O3).<div><br></div><div>David</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Jan 28, 2018 at 6:48 PM, Victor Leschuk via llvm-dev <span dir="ltr"><<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello all,<br>
<br>
clang-related PGO documentation recommends using PGO with -O2 (for<br>
example:<br>
<a href="https://clang.llvm.org/docs/UsersManual.html#profile-guided-optimization" rel="noreferrer" target="_blank">https://clang.llvm.org/docs/<wbr>UsersManual.html#profile-<wbr>guided-optimization</a>).<br>
The question is: is there any reason why exactly -O2 is used in<br>
examples? Are there any factors which can cause problems when using PGO<br>
with -O3?<br>
<br>
Thanks in advance for your advice!<br>
<span class="HOEnZb"><font color="#888888"><br>
--<br>
Best Regards,<br>
<br>
Victor Leschuk | Software Engineer | Access Softek<br>
<br>
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