From: "Grigori Fursin" <gfursin@gmail.com>
To: "'Duncan Sands'" <baldrick@free.fr>
Cc: "'Eric Botcazou'" <ebotcazou@adacore.com>, <gcc@gcc.gnu.org>,
"'Steven Bosscher'" <stevenb.gcc@gmail.com>
Subject: RE: dragonegg in FSF gcc?
Date: Sun, 11 Apr 2010 16:37:00 -0000 [thread overview]
Message-ID: <001401cad994$e1cfa730$a56ef590$@com> (raw)
In-Reply-To: <4BC1F6C5.1040401@free.fr>
Hi Duncan,
>how do you compile a program with LLVM? It's not a compiler, it's a set of
>optimization and codegen libraries. You also need a front-end, which takes
>the users code and turns it into the LLVM intermediate representation [IR]. The
>dragonegg plugin takes the output of the gcc-4.5 front-ends, turns it into LLVM
>IR and runs the LLVM optimizers and code generators on it. In other words, it
>is exactly what you need in order to compile programs with LLVM. There is also
>llvm-gcc, which is a hacked version of gcc-4.2 that does much the same thing,
>and for C and C++ there is now the clang front-end to LLVM. The big advantage
>of dragonegg is that it isolates the effect of the LLVM optimizers and code
>generators by removing the effect of having a different front-end. For example,
>if llvm-gcc produces slower code than gcc-4.5, this might be due to front-end
>changes between gcc-4.2 and gcc-4.5 rather than because the gcc optimizers are
>doing a better job. This confounding factor goes away with the dragonegg
>plugin.
Ok. I see what you mean. We simply used llvm-gcc so that's why the confusion ;) ...
Cheers,
Grigori
next prev parent reply other threads:[~2010-04-11 16:34 UTC|newest]
Thread overview: 104+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-09 16:44 Jack Howarth
2010-04-09 18:16 ` Basile Starynkevitch
2010-04-10 13:37 ` Duncan Sands
2010-04-11 12:54 ` Steven Bosscher
2010-04-11 14:17 ` Duncan Sands
2010-04-11 14:57 ` Eric Botcazou
2010-04-11 15:41 ` Duncan Sands
2010-04-11 15:56 ` Robert Dewar
2010-04-11 16:02 ` Grigori Fursin
2010-04-11 16:02 ` Robert Dewar
2010-04-11 16:28 ` Duncan Sands
2010-04-11 16:31 ` Robert Dewar
2010-04-13 16:58 ` Paolo Bonzini
2010-04-11 18:15 ` Andi Kleen
2010-04-11 16:26 ` Duncan Sands
2010-04-11 16:26 ` Robert Dewar
2010-04-11 16:34 ` Duncan Sands
2010-04-11 17:47 ` Robert Dewar
2010-04-11 16:37 ` Grigori Fursin [this message]
2010-04-11 18:50 ` Toon Moene
2010-04-11 21:43 ` Eric Botcazou
2010-04-11 16:32 ` Basile Starynkevitch
2010-04-21 16:52 ` Some benchmark comparison of gcc4.5 and dragonegg (was dragonegg in FSF gcc?) Vladimir Makarov
2010-04-21 17:00 ` Robert Dewar
2010-04-21 17:09 ` Steven Bosscher
2010-04-21 17:57 ` Paolo Bonzini
2010-04-21 18:28 ` Robert Dewar
2010-04-21 18:09 ` Robert Dewar
2010-04-22 10:24 ` Laurent GUERBY
2010-04-21 18:37 ` Basile Starynkevitch
2010-04-21 18:40 ` Robert Dewar
2010-04-21 17:21 ` Vladimir Makarov
2010-04-21 18:23 ` Robert Dewar
2010-04-21 20:54 ` Vladimir Makarov
2010-04-22 6:19 ` Robert Dewar
2010-04-22 18:44 ` Vladimir Makarov
2010-04-21 20:58 ` Toon Moene
2010-04-22 6:29 ` Robert Dewar
2010-04-21 17:05 ` Steven Bosscher
2010-04-21 17:10 ` Vladimir Makarov
2010-04-21 17:55 ` Manuel López-Ibáñez
2010-04-21 18:32 ` Robert Dewar
2010-04-21 19:03 ` Eric Botcazou
2010-04-21 17:42 ` Chris Lattner
2010-04-21 18:19 ` Vladimir Makarov
2010-04-21 18:25 ` Chris Lattner
2010-04-21 18:41 ` Vladimir Makarov
2010-04-21 19:35 ` Duncan Sands
2010-04-21 18:01 ` Duncan Sands
2010-04-21 18:19 ` Vladimir Makarov
2010-04-11 14:30 ` dragonegg in FSF gcc? Jack Howarth
2010-04-11 15:36 ` Manuel López-Ibáñez
2010-04-11 16:33 ` Dave Korn
2010-04-11 19:06 ` Laurent GUERBY
2010-04-11 22:19 ` Manuel López-Ibáñez
2010-04-11 22:26 ` Dave Korn
2010-04-12 7:34 ` Manuel López-Ibáñez
2010-04-12 13:38 ` Jack Howarth
2010-04-12 13:42 ` Robert Dewar
2010-04-12 13:52 ` Richard Guenther
2010-04-12 14:00 ` Jack Howarth
2010-04-12 15:59 ` Steven Bosscher
2010-04-12 16:03 ` Jack Howarth
2010-04-12 16:27 ` Steven Bosscher
2010-04-12 18:03 ` Dave Korn
2010-04-12 14:00 ` Dave Korn
2010-04-12 14:47 ` Manuel López-Ibáñez
2010-04-12 17:58 ` Weddington, Eric
2010-04-12 21:13 ` Toon Moene
2010-04-12 22:51 ` Ian Lance Taylor
2010-04-23 13:50 ` Poor internal documentation (was: dragonegg in FSF gcc?) Philipp Thomas
2010-04-23 14:26 ` Manuel López-Ibáñez
2010-04-24 19:07 ` Documentation legal issues (Was: Re: Poor internal documentation) Joern Rennecke
2010-06-05 10:10 ` Poor internal documentation (was: dragonegg in FSF gcc?) Philipp Thomas
2010-06-05 13:17 ` Jonathan Wakely
2010-04-13 17:15 ` dragonegg in FSF gcc? Paolo Bonzini
2010-04-13 17:18 ` Jack Howarth
2010-04-13 17:22 ` Paolo Bonzini
2010-04-13 19:19 ` Jack Howarth
2010-04-13 19:43 ` Paolo Bonzini
2010-04-13 20:29 ` Diego Novillo
2010-04-13 21:04 ` Steven Bosscher
2010-04-13 21:16 ` Diego Novillo
2010-04-14 14:06 ` Grigori Fursin
2010-04-13 18:05 ` Steven Bosscher
2010-04-13 19:26 ` Andrew Pinski
2010-04-13 19:28 ` Jack Howarth
2010-04-13 17:05 ` Paolo Bonzini
2010-04-13 21:06 ` Testing GCC on Cygwin made substantially easier [was Re: dragonegg in FSF gcc?] Dave Korn
2010-05-26 9:37 ` Laurynas Biveinis
2010-04-13 23:11 ` dragonegg in FSF gcc? Steven Bosscher
2010-04-13 23:43 ` Jack Howarth
2010-04-14 6:48 ` Duncan Sands
2010-04-14 13:54 ` Jack Howarth
2010-04-14 13:59 ` Paolo Bonzini
2010-04-11 14:33 ` Jack Howarth
2010-04-11 15:06 ` David Edelsohn
2010-04-11 15:24 ` Jack Howarth
2010-04-11 16:17 ` Duncan Sands
2010-04-11 16:20 ` Jack Howarth
2010-04-11 22:48 ` Jonathan Wakely
2010-04-12 13:35 ` Duncan Sands
2010-04-12 15:03 ` Alfred M. Szmidt
2010-04-12 15:34 ` Jack Howarth
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