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From: Richard Henderson <rth@twiddle.net>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Why Plan 9 C compilers don't have asm("")
Date: Sun, 22 Jul 2001 08:53:30 -0700	[thread overview]
Message-ID: <20010722085330.A7735@twiddle.net> (raw)
In-Reply-To: <20010721234952.A4349@twiddle.net> <Pine.LNX.4.33.0107220025500.6342-100000@penguin.transmeta.com>
In-Reply-To: <Pine.LNX.4.33.0107220025500.6342-100000@penguin.transmeta.com>; from torvalds@transmeta.com on Sun, Jul 22, 2001 at 12:44:57AM -0700

On Sun, Jul 22, 2001 at 12:44:57AM -0700, Linus Torvalds wrote:
> But if you don't do that, you don't need a stack frame. You just reload GP
> and jump back to the caller.

Hmm.  Yes, that could work.  We'd still be changing the ABI, since
the original source "bsr foo" would really mean "bsr foo+skip ldgp".
But perhaps one that wouldn't matter for all practical purposes.

This would need to be done with a new relocation type so that old
linkers that didn't handle this sort of thing choke, but that's not
a big deal.

If I find the time I may give it a shot and see what sort of 
effect it has on typical code.


r~

  reply	other threads:[~2001-07-22 15:55 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-07-04  3:37 Why Plan 9 C compilers don't have asm("") Rick Hohensee
2001-07-04  3:36 ` Olivier Galibert
2001-07-04  6:24   ` Cort Dougan
2001-07-04  8:03     ` H. Peter Anvin
2001-07-04 17:22     ` Linus Torvalds
2001-07-06  8:38       ` Cort Dougan
2001-07-06 18:44         ` Linus Torvalds
2001-07-06 20:02           ` Cort Dougan
2001-07-08 21:55           ` Victor Yodaiken
2001-07-08 22:28             ` Alan Cox
2001-07-09  1:22             ` Johan Kullstam
2001-07-08 22:29           ` David S. Miller
2001-07-06 11:43       ` David S. Miller
2001-07-21 22:10       ` Richard Henderson
2001-07-22  3:43         ` Linus Torvalds
2001-07-22  3:59           ` Mike Castle
2001-07-22  6:49           ` Richard Henderson
2001-07-22  7:44             ` Linus Torvalds
2001-07-22 15:53               ` Richard Henderson [this message]
2001-07-22 19:08                 ` Linus Torvalds
2001-07-04  7:15 ` pazke
2001-07-04 17:32 ` Don't feed the trooll [offtopic] " Ben LaHaise
2001-07-05  1:02 ` Michael Meissner
2001-07-05  1:54   ` Rick Hohensee
2001-07-05 16:54     ` Michael Meissner
2001-07-04 10:10 Rick Hohensee
2001-07-05  3:26 Rick Hohensee
2001-07-06 17:24 Rick Hohensee
2001-07-06 23:54 ` David S. Miller
2001-07-07  0:16   ` H. Peter Anvin
2001-07-07  0:37   ` David S. Miller
2001-07-07  6:16 Rick Hohensee
     [not found] <mailman.994629840.17424.linux-kernel2news@redhat.com>
2001-07-09  0:08 ` Pete Zaitcev
2001-07-09  0:28   ` Victor Yodaiken
2001-07-09  3:03 Rick Hohensee
2001-07-23  4:39 Rick Hohensee

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