public inbox for gcc@gcc.gnu.org
 help / color / mirror / Atom feed
From: dewar@gnat.com (Robert Dewar)
To: rth@redhat.com, toon@moene.indiv.nluug.nl
Cc: gcc@gcc.gnu.org
Subject: Re: possible gcse failure: not able to eliminate redundant loads
Date: Wed, 18 Dec 2002 18:39:00 -0000	[thread overview]
Message-ID: <20021219012754.5F8D8F28D5@nile.gnat.com> (raw)

> i.e. the dereference is protected by a conditional.  Thus
> we can't hoist the dereference past the conditional (and
> thence out of the loop that started this thread).


it is interesting to note that the IBM compiler group decided that
ensuring that null could be safetly dereferenced, and hence such
references can be hoisted etc, was a major win in C code efficiency.

             reply	other threads:[~2002-12-19  1:28 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-12-18 18:39 Robert Dewar [this message]
2002-12-19  3:02 ` Richard Henderson
2002-12-21 19:49 ` Alexandre Oliva
  -- strict thread matches above, loose matches on Subject: below --
2002-12-21 20:36 Robert Dewar
2002-12-19  7:08 Richard Kenner
2002-12-13  0:39 Sanjiv Kumar Gupta, Noida
2002-12-13  2:42 ` Richard Henderson
2002-12-13 13:10   ` Toon Moene
2002-12-16 10:15     ` Richard Henderson
2002-12-16 11:32       ` Andrew Haley
2002-12-16 13:13       ` Toon Moene
2002-12-16 13:32         ` Richard Henderson
2002-12-16 14:44           ` Toon Moene
2002-12-16 14:48             ` Toon Moene
2002-12-16 15:29               ` Richard Henderson
2002-12-17 15:20                 ` Toon Moene
2002-12-16 15:38               ` Jan Hubicka
2002-12-16 16:40           ` Alex Rosenberg
2002-12-12 23:42 Sanjiv Kumar Gupta, Noida
2002-12-12 21:35 Sanjiv Kumar Gupta, Noida
2002-12-12 21:44 ` Dan Nicolaescu
2002-12-11 22:00 Sanjiv Kumar Gupta, Noida
2002-12-11 22:18 ` Daniel Berlin
2002-12-11 20:32 Sanjiv Kumar Gupta, Noida
2002-12-11  3:30 Sanjiv Kumar Gupta, Noida
2002-12-11 14:53 ` Dale Johannesen
2002-12-11 20:02   ` Daniel Berlin
2002-12-11 20:03     ` Daniel Berlin
2002-12-12 12:25     ` Richard Henderson
2002-12-12 12:28       ` Daniel Berlin
2002-12-12 13:03         ` Richard Henderson
2002-12-12 13:04           ` David Edelsohn
2002-12-12 14:32             ` Richard Henderson
2002-12-12 14:42               ` David Edelsohn
2002-12-12 14:58                 ` Richard Henderson
2002-12-12 15:28                   ` Daniel Berlin
2002-12-13  3:41                     ` Richard Henderson
2002-12-12 20:30                   ` David Edelsohn
2002-12-12 15:29               ` Geoff Keating
2002-12-11  3:27 Sanjiv Kumar Gupta, Noida

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=20021219012754.5F8D8F28D5@nile.gnat.com \
    --to=dewar@gnat.com \
    --cc=gcc@gcc.gnu.org \
    --cc=rth@redhat.com \
    --cc=toon@moene.indiv.nluug.nl \
    /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).