From: Segher Boessenkool <segher@kernel.crashing.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: gcc-patches@gcc.gnu.org
Subject: Re: [PATCH 3/4] bb-reorder: Add -freorder-blocks-algorithm= and wire it up
Date: Thu, 24 Sep 2015 17:16:00 -0000 [thread overview]
Message-ID: <20150924152108.GA21981@gate.crashing.org> (raw)
Message-ID: <20150924171600.7OHCQe_fIjjWv_JNQ5OLdX7xCNe9HFheL0MrDjk_DwE@z> (raw)
In-Reply-To: <87y4fvsvew.fsf@tassilo.jf.intel.com>
On Thu, Sep 24, 2015 at 08:12:55AM -0700, Andi Kleen wrote:
> Segher Boessenkool <segher@kernel.crashing.org> writes:
> >
> > In effect, the changes are for -O1 (which now gets "simple" instead of
> > nothing), -Os (which now gets "simple" instead of "stc", since STC results
> > in much bigger code), and for targets that wish to never use STC (not in
> > this patch though).
>
> Do you have some data on the code size differences with -Os?
It's about 0.1% for a quick combine.ii sniff test; I don't have big test
results for -Os.
"Much bigger code" is a mischaracterisation, that is true for -O2, not -Os.
Segher
next prev parent reply other threads:[~2015-09-24 16:39 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-23 22:09 [PATCH 0/4] bb-reorder: Add the "simple" algorithm Segher Boessenkool
2015-09-23 22:09 ` [PATCH 1/4] bb-reorder: Split out STC Segher Boessenkool
2015-09-24 16:12 ` Steven Bosscher
2015-09-23 22:10 ` [PATCH 2/4] bb-reorder: Add the "simple" algorithm Segher Boessenkool
2015-09-24 11:13 ` Bernd Schmidt
2015-09-24 13:48 ` Segher Boessenkool
2015-09-24 15:19 ` Segher Boessenkool
2015-09-24 16:35 ` Steven Bosscher
2015-09-24 17:22 ` Segher Boessenkool
2015-09-25 14:31 ` [PATCH 2/4 v2] " Segher Boessenkool
2015-09-25 16:09 ` Peter Bergner
2015-09-25 16:15 ` Segher Boessenkool
2015-09-29 13:19 ` Bernd Schmidt
2015-09-23 23:01 ` [PATCH 3/4] bb-reorder: Add -freorder-blocks-algorithm= and wire it up Segher Boessenkool
2015-09-24 11:00 ` Bernd Schmidt
2015-09-24 14:06 ` Segher Boessenkool
2015-09-24 15:21 ` Andi Kleen
2015-09-24 15:49 ` Segher Boessenkool [this message]
2015-09-24 17:16 ` Segher Boessenkool
[not found] ` <56377569.7010904@arm.com>
2015-11-02 15:14 ` Alan Lawrence
2015-11-02 21:04 ` Segher Boessenkool
2015-09-23 23:36 ` [PATCH 4/4] bb-reorder: Documentation updates Segher Boessenkool
2015-09-24 10:33 ` [PATCH 0/4] bb-reorder: Add the "simple" algorithm Bernd Schmidt
2015-09-24 13:32 ` Segher Boessenkool
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