From: Andi Kleen <andi@firstfloor.org>
To: Teresa Johnson <tejohnson@google.com>
Cc: "gcc-patches\@gcc.gnu.org" <gcc-patches@gcc.gnu.org>,
Jan Hubicka <hubicka@ucw.cz>,
Xinliang David Li <davidxl@google.com>
Subject: Re: [PATCH] Disable -fno-reorder-blocks-and-partition if no -fprofile-use to avoid unnecessary overhead
Date: Fri, 25 Sep 2015 16:58:00 -0000 [thread overview]
Message-ID: <87twqisaht.fsf@tassilo.jf.intel.com> (raw)
In-Reply-To: <CAAe5K+WwdWZyp96ODECAxPsu-nf97akiKzremnhPbiYGS2E_bw@mail.gmail.com> (Teresa Johnson's message of "Thu, 24 Sep 2015 10:16:24 -0700")
Teresa Johnson <tejohnson@google.com> writes:
> This patch unsets -freorder-blocks-and-partition when -fprofile-use
> is not specified. Function splitting was not actually being performed
> in that case, as probably_never_executed_bb_p does not distinguish
> any basic blocks as being cold vs hot when there is no profile data.
Actually I'm experimenting with a patch to fix that by allowing
function splitting even without profile feed back. See PR66890
which has the patch. I would prefer to keep and fix it.
-Andi
--
ak@linux.intel.com -- Speaking for myself only
next prev parent reply other threads:[~2015-09-25 16:57 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-24 18:49 Teresa Johnson
2015-09-24 19:02 ` pinskia
2015-09-25 14:14 ` Bernd Schmidt
2015-09-25 14:26 ` Teresa Johnson
2015-09-25 14:34 ` Bernd Schmidt
2015-09-25 14:54 ` Jan Hubicka
2015-09-25 16:58 ` Teresa Johnson
2015-09-25 16:58 ` Andi Kleen [this message]
2015-09-25 17:23 ` Teresa Johnson
2015-09-25 17:36 ` Jeff Law
2015-09-25 19:13 ` Andi Kleen
2015-09-27 0:55 ` Bernhard Reutner-Fischer
2015-09-27 10:24 ` Andi Kleen
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