From: Benjamin Herrenschmidt <bh40@calva.net>
To: Tony Mantler <eek@escape.ca>, linuxppc-dev@lists.linuxppc.org
Subject: Re: question about altivec registers
Date: Fri, 29 Oct 1999 13:58:48 +0200 [thread overview]
Message-ID: <19991029135848.007534@mailhost.mipsys.com> (raw)
In-Reply-To: <v04003a00b43e690932c6@[216.81.26.227]>
On Thu, Oct 28, 1999, Tony Mantler <eek@escape.ca> wrote:
>I think saving registers in a subroutine is a pain no matter how it's
>implemented. If the VRSAVE is used as a count, the subroutine still has to
>save the old value, save the overwritten registers, calculate what the
>proper new value is (think new < old = oops!) then restore the overwritten
>registers and old VRSAVE value when it exits.
In their latest Mac compiler, Metroweks added a pragma for manually
optimising this when you know you'll use a bunch of those registers:
<<
#pragma altivec_vrsave allon is now supported. It sets VRsave assuming
that all altivec registers are in use, best used with
"#pragma altivec_vrsave off" so only the parent routine updates the
vrsave register.
>>
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~1999-10-29 11:58 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-10-25 20:51 question about altivec registers Jim Terman
1999-10-25 22:27 ` Claude Robitaille
1999-10-25 22:31 ` Jim Terman
1999-10-25 22:44 ` erik cameron
1999-10-25 23:28 ` Claude Robitaille
[not found] ` <Pine.LNX.4.10.9910251916060.5902-100000@modemcable220.93-200-24.mtl.mc.vi deotron.net>
1999-10-25 23:53 ` Rob Barris
1999-10-26 18:22 ` Geert Uytterhoeven
1999-10-26 22:13 ` Rob Barris
1999-10-26 22:38 ` Tom Vier
1999-10-26 22:03 ` Tom Vier
1999-10-26 4:42 ` Kumar Gala
1999-10-26 21:52 ` Jim Terman
1999-10-26 22:43 ` Kumar Gala
1999-10-27 8:58 ` Adrian Cox
1999-10-27 13:21 ` Gabriel Paubert
1999-10-27 16:05 ` Geert Uytterhoeven
1999-10-27 18:23 ` Kumar Gala
1999-10-27 22:39 ` Tony Mantler
1999-10-28 11:01 ` Gabriel Paubert
1999-10-28 21:20 ` Tony Mantler
1999-10-29 11:58 ` Benjamin Herrenschmidt [this message]
1999-10-29 12:49 ` Gabriel Paubert
1999-10-30 4:14 ` Tony Mantler
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=19991029135848.007534@mailhost.mipsys.com \
--to=bh40@calva.net \
--cc=eek@escape.ca \
--cc=linuxppc-dev@lists.linuxppc.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 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).