From: Georg-Johann Lay <avr@gjlay.de>
To: Richard Henderson <rth@redhat.com>
Cc: GCC Patches <gcc-patches@gcc.gnu.org>,
Denis Chertykov <chertykov@gmail.com>,
Denis Chertykov <chertykov@gmail.com>
Subject: Re: [RFC] Cleanup DW_CFA_GNU_args_size handling
Date: Wed, 03 Aug 2011 12:16:00 -0000 [thread overview]
Message-ID: <4E393BBB.8030300@gjlay.de> (raw)
In-Reply-To: <4E36F48F.4040106@redhat.com>
Richard Henderson wrote:
> On 08/01/2011 11:42 AM, Georg-Johann Lay wrote:
>> Is there a specific reason not to define
>> ACCUMULATE_OUTGOING_ARGS on AVR?
>
> Yes. So that you can use PUSH. But as I said in PR49881,
> you probably want to provide -maccumulate-outgoing-args.
>
> I have a follow-up patch to the last one in that PR...
>
>
> r~
PUSH is fine but what about POP?
It's very expensive to pop several bytes, i.e. disabling IRQs, loading and storing SP and the like.
Usung store+displacement has not this drawback and as I wrote, come code degradations you explained
in PR49881 are artifacts of PR46278, i.e. fake X addressing.
Johann
next prev parent reply other threads:[~2011-08-03 12:16 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-01 17:40 Richard Henderson
2011-08-01 18:43 ` Georg-Johann Lay
2011-08-01 18:47 ` Richard Henderson
2011-08-01 19:53 ` Denis Chertykov
2011-08-03 12:16 ` Georg-Johann Lay [this message]
2011-08-03 14:08 ` Georg-Johann Lay
2011-08-03 15:13 ` Richard Henderson
2011-08-03 15:49 ` Georg-Johann Lay
2011-08-03 15:53 ` Richard Henderson
2011-08-03 16:24 ` Jeff Law
2011-08-02 2:00 ` Richard Henderson
2011-08-02 22:32 ` Richard Henderson
2011-08-03 14:31 ` H.J. Lu
2011-08-03 17:39 ` H.J. Lu
2011-12-21 5:20 ` Jie Zhang
2011-08-03 14:07 ` Ulrich Weigand
2011-08-03 15:15 ` Richard Henderson
2011-08-03 17:01 ` Ulrich Weigand
2011-08-20 15:52 Gerald Pfeifer
2011-08-22 6:42 ` Eric Botcazou
2011-08-23 22:20 ` Richard Henderson
2011-08-24 6:44 ` Gerald Pfeifer
2011-08-24 7:38 ` Richard Henderson
2011-08-24 8:46 ` Gerald Pfeifer
2011-08-24 8:48 ` H.J. Lu
2011-08-24 17:38 ` Eric Botcazou
2011-09-04 18:39 ` Gerald Pfeifer
2011-09-09 10:01 ` Eric Botcazou
2011-09-09 19:07 ` Eric Botcazou
2011-09-09 20:02 ` H.J. Lu
2011-09-10 14:08 ` Eric Botcazou
2011-09-10 19:03 ` H.J. Lu
2011-09-11 2:35 ` Gerald Pfeifer
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