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Sender: Warner Losh <wlosh@bsdimp.com>
Subject: Re: amd64: -O2 even with DEBUG
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From: Warner Losh <imp@bsdimp.com>
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Date: Fri, 26 Jul 2013 17:44:58 -0700
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To: John-Mark Gurney <jmg@funkthat.com>
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Cc: Andriy Gapon <avg@freebsd.org>, freebsd-arch@freebsd.org
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On Jul 26, 2013, at 11:54 AM, John-Mark Gurney wrote:

> Andriy Gapon wrote this message on Fri, Jul 26, 2013 at 10:14 +0300:
>> I wonder why amd64 is distinguished to have -O2 in COPTFLAGS even =
when DEBUG is
>> defined.  For all other archs it's -O for that case.
>>=20
>> Perhaps, this was discussed / explained in the past, but I would =
appreciate it
>> being said again (or even written as a comment in kern.pre.mk).
>=20
> It's probably because at least gcc produces terrible amd64 code w/o
> it...  It will constantly reload the register it uses to do relative
> loads w/ the same value even though nothing changed... makes =
performance
> suck...=20

Still looks like it is implemented wrongly though...

Warner