All of lore.kernel.org
 help / color / mirror / Atom feed
From: Segher Boessenkool <segher@kernel.crashing.org>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>, Scott Wood <oss@buserror.net>,
	linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] powerpc: sysdev: cpm1: Optimise gpio bit calculation
Date: Fri, 10 Mar 2017 07:02:22 -0600	[thread overview]
Message-ID: <20170310130222.GG31469@gate.crashing.org> (raw)
In-Reply-To: <87a88tle0y.fsf@concordia.ellerman.id.au>

On Fri, Mar 10, 2017 at 07:41:33PM +1100, Michael Ellerman wrote:
> Well yeah, it saves one instruction, but is it worth it? Are these gpio
> routines in some hot path I don't know about?

If there was a GCC PR for this we probably would make GCC optimise
this; there are many similar things that are optimised already, just
not this one.


Segher

      parent reply	other threads:[~2017-03-10 13:07 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-09  9:42 [PATCH] powerpc: sysdev: cpm1: Optimise gpio bit calculation Christophe Leroy
2017-03-10  8:41 ` Michael Ellerman
2017-03-10 10:54   ` Christophe LEROY
2017-03-10 13:06     ` Segher Boessenkool
2017-03-10 14:04       ` Christophe LEROY
2017-03-10 14:32         ` Segher Boessenkool
2017-03-10 14:41           ` Christophe LEROY
2017-03-10 15:41             ` Segher Boessenkool
2017-03-21 15:04               ` Christophe LEROY
2017-03-10 13:02   ` Segher Boessenkool [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20170310130222.GG31469@gate.crashing.org \
    --to=segher@kernel.crashing.org \
    --cc=benh@kernel.crashing.org \
    --cc=christophe.leroy@c-s.fr \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linuxppc-dev@lists.ozlabs.org \
    --cc=mpe@ellerman.id.au \
    --cc=oss@buserror.net \
    --cc=paulus@samba.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.