From: "H. Peter Anvin" <hpa@zytor.com>
To: linux-kernel@vger.kernel.org
Subject: Re: 2.4 kernel & gcc code generation: a bug?
Date: 6 Feb 2001 23:46:28 -0800 [thread overview]
Message-ID: <95qugk$brs$1@cesium.transmeta.com> (raw)
In-Reply-To: <3A8108F8.2476.21D0F5@localhost>
Followup to: <3A8108F8.2476.21D0F5@localhost>
By author: "Ulrich Windl" <Ulrich.Windl@rz.uni-regensburg.de>
In newsgroup: linux.dev.kernel
>
> You'll notice that %edx is not pushed at the start of the function.
> Unless the caller saves that, edx will be spilled. Depending on the
> level of optimization this can be bad. Am I wrong?
>
Yes. %eax, %edx and %ecx are defined as caller-saved registers. Each
function is free to clobber them at will.
Now, if you saw the same for %ebx, %ebp, %esi or %edi, that would be
bad.
-hpa
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/
prev parent reply other threads:[~2001-02-07 7:47 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-02-07 7:36 2.4 kernel & gcc code generation: a bug? Ulrich Windl
2001-02-07 7:46 ` H. Peter Anvin [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='95qugk$brs$1@cesium.transmeta.com' \
--to=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.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.