Am 05.03.2013 18:32, schrieb Vincent Lejeune:
LICM stands for Loop Invariant Code Motion.
Instructions that does not depend of loop index are moved outside of loop body.
(This solves one of llvm generated code Vadim pointed in another thread)
DCE is DeadCodeElimination...I don't know the difference between "classic" DCE
and aggressive DCE though.
If I understand it correctly the DCE pass just removes the trivial dead
instructions, e.g. not used and doesn't have a side effect. While the
aggressive DCE pass goes a bit more into the depth. For example imagine
a loop with an unused variable incremented, the increment depends on
itself, but it's completely useless...
Christian.
----- Mail original -----
De : Michel Dänzer <mic...@daenzer.net>
À : Christian König <deathsim...@vodafone.de>
Cc : mesa-dev@lists.freedesktop.org
Envoyé le : Mardi 5 mars 2013 18h20
Objet : Re: [Mesa-dev] [PATCH 7/7] radeon/llvm: enable LICM and DCE pass
On Die, 2013-03-05 at 15:27 +0100, Christian König wrote:
From: Christian König <christian.koe...@amd.com>
Signed-off-by: Christian König <christian.koe...@amd.com>
This could use a little more information, e.g.: What are LICM and DCE?
Why is it a good idea to enable them?
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Debian, X and DRI developer
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