This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug target/84280] [6/7/8 Regression] Performance regression in g++-7 with Eigen for non-AVX2 CPUs
- From: "patrikhuber at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 08 Feb 2018 20:37:47 +0000
- Subject: [Bug target/84280] [6/7/8 Regression] Performance regression in g++-7 with Eigen for non-AVX2 CPUs
- Auto-submitted: auto-generated
- References: <bug-84280-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84280
--- Comment #14 from Patrik Huber <patrikhuber at gmail dot com> ---
It even seems a few percent slower after the FDO stuff. But the `
-fprofile-use` is a bit weird. If there is no .gcda file, it doesn't complain.
If you give it a file that doesn't exist (e.g. -fprofile-use=foo), then it
doesn't complain either. So how can I check whether it really ran the FDO?