public inbox for gcc-prs@sourceware.org
help / color / mirror / Atom feed
From: rth@gcc.gnu.org
To: gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
jodaman@cegt201.bradley.edu, nobody@gcc.gnu.org
Subject: Re: c/4134: inline assembly - gcc fails to work around register pressure
Date: Tue, 23 Apr 2002 01:18:00 -0000 [thread overview]
Message-ID: <20020423081812.15852.qmail@sources.redhat.com> (raw)
Synopsis: inline assembly - gcc fails to work around register pressure
State-Changed-From-To: open->closed
State-Changed-By: rth
State-Changed-When: Tue Apr 23 01:18:11 2002
State-Changed-Why:
Not a bug. You really have run out of registers.
Your ifdef BUG example requires 7 registers: 3 for
each of the "r" inputs, 1 for the address of the
input memory parameter, and 3 are clobbered and thus
cannot be used.
The i386 has 8 registers one is reserved for the stack pointer, and one is reserved for the frame pointer (at least
without -fomit-frame-pointer), leaving only 6, one short
of the required 7.
As a guess, egcs failed to properly not use one of the
registers marked clobbered.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=4134
next reply other threads:[~2002-04-23 8:18 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-23 1:18 rth [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-04-25 6:56 J.D.
2001-08-27 2:16 jodaman
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=20020423081812.15852.qmail@sources.redhat.com \
--to=rth@gcc.gnu.org \
--cc=gcc-bugs@gcc.gnu.org \
--cc=gcc-gnats@gcc.gnu.org \
--cc=gcc-prs@gcc.gnu.org \
--cc=jodaman@cegt201.bradley.edu \
--cc=nobody@gcc.gnu.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 read-only IMAP folder(s) and NNTP newsgroup(s).