From: Richard Henderson <rth@twiddle.net>
To: Stefan Hajnoczi <stefanha@redhat.com>, qemu-devel@nongnu.org
Cc: Peter Maydell <peter.maydell@linaro.org>,
Markus Armbruster <armbru@redhat.com>
Subject: Re: [Qemu-devel] [PATCH 3/7] Convert ffs() != 0 callers to ctz32()
Date: Mon, 30 Mar 2015 08:42:28 -0700 [thread overview]
Message-ID: <55196EE4.6010502@twiddle.net> (raw)
In-Reply-To: <1426593410-21405-4-git-send-email-stefanha@redhat.com>
On 03/17/2015 04:56 AM, Stefan Hajnoczi wrote:
> @@ -1989,8 +1989,7 @@ static void omap_mpuio_write(void *opaque, hwaddr addr,
> case 0x04: /* OUTPUT_REG */
> diff = (s->outputs ^ value) & ~s->dir;
> s->outputs = value;
> - while ((ln = ffs(diff))) {
> - ln --;
> + while ((ln = ctz32(diff)) != 32) {
> if (s->handler[ln])
> qemu_set_irq(s->handler[ln], (value >> ln) & 1);
> diff &= ~(1 << ln);
Surely
while (diff != 0) {
ln = ctz32(diff);
...
}
would be a better conversion.
r~
next prev parent reply other threads:[~2015-03-30 15:42 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-17 11:56 [Qemu-devel] [PATCH 0/7] Convert ffs(3) to ctz32() Stefan Hajnoczi
2015-03-17 11:56 ` [Qemu-devel] [PATCH 1/7] bt-sdp: fix broken uuids power-of-2 calculation Stefan Hajnoczi
2015-03-17 14:37 ` Eric Blake
2015-03-17 11:56 ` [Qemu-devel] [PATCH 2/7] Convert (ffs(val) - 1) to ctz32(val) Stefan Hajnoczi
2015-03-17 12:09 ` Peter Maydell
2015-03-17 14:54 ` Stefan Hajnoczi
2015-03-17 11:56 ` [Qemu-devel] [PATCH 3/7] Convert ffs() != 0 callers to ctz32() Stefan Hajnoczi
2015-03-30 15:42 ` Richard Henderson [this message]
2015-03-17 11:56 ` [Qemu-devel] [PATCH 4/7] sd: convert sd_normal_command() ffs(3) call " Stefan Hajnoczi
2015-03-17 11:56 ` [Qemu-devel] [PATCH 5/7] omap_intc: convert ffs(3) to ctz32() in omap_inth_sir_update() Stefan Hajnoczi
2015-03-17 14:58 ` Paolo Bonzini
2015-03-30 15:44 ` Richard Henderson
2015-03-17 11:56 ` [Qemu-devel] [PATCH 6/7] os-win32: drop ffs(3) prototype Stefan Hajnoczi
2015-03-17 11:56 ` [Qemu-devel] [PATCH 7/7] checkpatch: complain about ffs(3) calls Stefan Hajnoczi
2015-03-17 12:02 ` [Qemu-devel] [PATCH 0/7] Convert ffs(3) to ctz32() Stefan Hajnoczi
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=55196EE4.6010502@twiddle.net \
--to=rth@twiddle.net \
--cc=armbru@redhat.com \
--cc=peter.maydell@linaro.org \
--cc=qemu-devel@nongnu.org \
--cc=stefanha@redhat.com \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).