From: Tom Roberts <tjroberts@lucent.com>
To: cal_erickson@mvista.com
Cc: Seong-kyu Ko <sugenius@doit.ajou.ac.kr>,
linuxppc-embedded@lists.linuxppc.org
Subject: Re: Problems of the corss-compiler.
Date: Mon, 28 Aug 2000 14:34:32 -0500 [thread overview]
Message-ID: <39AABEC8.4DDE4CA0@lucent.com> (raw)
In-Reply-To: 39AAA991.32FDF058@mvista.com
Cal Erickson wrote:
> In the MSR of the PPC processor there is a bit
> that indicates whether there is hardware
> floating point unit available.
Beware -- Linux uses the bit to optimize FP-register usage in the
kernel. Basically it starts each process with the bit off, but turns
it on for a process which takes the "FP not avail" trap. The
optimization occurs in context switches where the FP registers are
not saved or restored for processes with this bit off.
This is, of course, for CPUs which have FP units.... IIRC the CPUs
without FP units have the bit hardwired to 0.
Tom Roberts tjroberts@lucent.com
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2000-08-28 19:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-08-28 17:17 Problems of the corss-compiler Seong-kyu Ko
2000-08-28 17:25 ` Ralph Blach
2000-08-28 18:04 ` Cal Erickson
2000-08-28 19:34 ` Tom Roberts [this message]
2000-08-29 4:11 ` software floating point ÁֹαÔ
2000-08-29 4:48 ` Graham Stoney
-- strict thread matches above, loose matches on Subject: below --
2000-08-28 17:38 Problems of the corss-compiler Whitney, John
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=39AABEC8.4DDE4CA0@lucent.com \
--to=tjroberts@lucent.com \
--cc=cal_erickson@mvista.com \
--cc=linuxppc-embedded@lists.linuxppc.org \
--cc=sugenius@doit.ajou.ac.kr \
/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).