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
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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
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