From: Josh Triplett <josh@joshtriplett.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Jeff Garzik <jeff@garzik.org>, Pekka Enberg <penberg@kernel.org>,
Sparse Mailing-list <linux-sparse@vger.kernel.org>
Subject: Re: [PATCH] Re: LLVM and PSEUDO_REG/PSEUDO_PHI
Date: Sun, 28 Aug 2011 10:52:55 -0700 [thread overview]
Message-ID: <20110828175255.GA10203@leaf> (raw)
In-Reply-To: <CA+55aFw5VYSXduhXrtQx5CM4ubvOoHtrbyF74Y_wOQpBxE6Vmw@mail.gmail.com>
On Sun, Aug 28, 2011 at 10:04:54AM -0700, Linus Torvalds wrote:
> On Sun, Aug 28, 2011 at 3:04 AM, Jeff Garzik <jeff@garzik.org> wrote:
> >
> > * need to start integrating struct support. LLVM has a type system where
> > one defines data structures in the IR, then uses 'getelementptr' LLVM
> > instruction to build addresses for complex load/store operations. The Linux
> > kernel uses a lot of function calls (indirect branches) from values buried
> > deep within a struct.
>
> You really shouldn't need to do that.
>
> You should consider all types to be just "blocks of memory", and
> sparse has already calculated all offsets etc for you. As far as LLVM
> is concerned, the memory has no structure, it's just a blob.
I suspect LLVM's optimization passes won't particularly care for that
approach.
- Josh Triplett
--
To unsubscribe from this list: send the line "unsubscribe linux-sparse" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2011-08-28 17:53 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4E5495C9.6050207@kernel.org>
[not found] ` <CA+55aFwLLn30qohqJeBZLVUYWLKUnbBxnL9u+v=4Fx8TpxDQUQ@mail.gmail.com>
[not found] ` <4E55F33C.50203@kernel.org>
[not found] ` <CAOJsxLF-=mPSdKLwmc61ZRTQrLGjPTUwVw+PqabYvGKVRwh9sQ@mail.gmail.com>
[not found] ` <CAOJsxLFMz7fs4ySkizHk43a0fz9VKS5ReWXoJa8cy2AQ6iwRng@mail.gmail.com>
[not found] ` <CA+55aFywG3vBA87W2h1f=-H144MTZesEwp5jVu8ndyBfLX7Sbg@mail.gmail.com>
[not found] ` <alpine.DEB.2.00.1108252046090.6272@localhost6.localdomain6>
[not found] ` <CA+55aFxRkS4HLeW18-q+4Co7kRdiQBv4wnD=GX5ymAGigXR3MQ@mail.gmail.com>
[not found] ` <alpine.DEB.2.00.1108252107210.6272@localhost6.localdomain6>
[not found] ` <4E58731A.7010708@garzik.org>
[not found] ` <alpine.DEB.2.00.1108271104440.2570@localhost6.localdomain6>
[not found] ` <4E58AE9E.1090601@garzik.org>
[not found] ` <4E59478C.9000504@garzik.org>
[not found] ` <alpine.DEB.2.00.1108280815530.2734@localhost6.localdomain6>
2011-08-28 10:04 ` [PATCH] Re: LLVM and PSEUDO_REG/PSEUDO_PHI Jeff Garzik
2011-08-28 10:18 ` Jeff Garzik
2011-08-29 14:45 ` Pekka Enberg
2011-08-28 17:04 ` Linus Torvalds
2011-08-28 17:52 ` Josh Triplett [this message]
2011-08-28 18:23 ` Linus Torvalds
2011-08-28 19:33 ` Jeff Garzik
2011-08-31 12:09 ` Pekka Enberg
2011-08-28 19:31 ` Jeff Garzik
2011-08-28 19:46 ` Linus Torvalds
2011-08-29 14:42 ` Pekka Enberg
2011-08-29 15:14 ` Jeff Garzik
2011-08-29 16:16 ` Josh Triplett
[not found] ` <alpine.DEB.2.00.1108252310490.22479@localhost6.localdomain6>
[not found] ` <CA+55aFy3TUT=BFD+Nb9H6uDBhz427kC4tBc+ehQDs6JBggTuHQ@mail.gmail.com>
[not found] ` <4E573A3E.6060104@kernel.org>
[not found] ` <CA+55aFzbV0OvrtkzbjxvL1tkfF=+6xbBsyWb8XtAcK-YNeKjZw@mail.gmail.com>
[not found] ` <alpine.DEB.2.00.1108271214410.14365@localhost6.localdomain6>
[not found] ` <CA+55aFzbfD4RDe52HCL9mfSYMzFdvP96OiK5ifkfUKNkzjJNrg@mail.gmail.com>
2011-08-29 19:45 ` Pekka Enberg
2011-08-29 19:52 ` Jeff Garzik
2011-08-29 20:32 ` Linus Torvalds
2011-08-29 20:42 ` Pekka Enberg
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=20110828175255.GA10203@leaf \
--to=josh@joshtriplett.org \
--cc=jeff@garzik.org \
--cc=linux-sparse@vger.kernel.org \
--cc=penberg@kernel.org \
--cc=torvalds@linux-foundation.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.