dca7ac335b
LoopDeletion depends on loops having dedicated exits.
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llvm-svn: 86180
2009-11-05 21:47:04 +00:00
880c92ac1c
Rename forgetLoopBackedgeTakenCount to forgetLoop, because it
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clears out more information than just the stored backedge taken count.
llvm-svn: 85664
2009-10-31 15:04:55 +00:00
34e38afa96
Simplify this code. LoopDeletion doesn't need to explicit check that
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the loop exiting block dominates the latch block; if ScalarEvolution
can prove that the trip-count is finite, that's sufficient.
llvm-svn: 85165
2009-10-26 22:18:58 +00:00
41d00ac45b
Make LoopDeletion check the maximum backedge taken count, rather than the
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exact backedge taken count, when checking for infinite loops. This allows
it to delete loops with multiple exit conditions.
llvm-svn: 84952
2009-10-23 17:10:01 +00:00
2dd09dbdf7
eliminate VISIBILITY_HIDDEN from Transforms/Scalar. PR4861
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llvm-svn: 80766
2009-09-02 06:11:42 +00:00
c43e47938a
Make makeLoopInvariant report whether it made any changes or not,
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and use this to simplify more code.
llvm-svn: 75722
2009-07-15 01:25:43 +00:00
7bb3173ff7
Tell ScalarEvolution to forget a loop before starting to delete it.
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This way ScalarEvolution can examine the loop to determine what state
it needs to update, if it chooses.
llvm-svn: 75029
2009-07-08 19:14:29 +00:00
af75234955
Change all SCEV* to SCEV *.
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llvm-svn: 74918
2009-07-07 17:06:11 +00:00
65b6056e37
SCEVHandle is no more!
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llvm-svn: 73906
2009-06-22 21:39:50 +00:00
1efabaaa2a
Allow readonly functions to unwind exceptions. Teach
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the optimizers about this. For example, a readonly
function with no uses cannot be removed unless it is
also marked nounwind.
llvm-svn: 71071
2009-05-06 06:49:50 +00:00
48f8222293
Re-apply 70645, converting ScalarEvolution to use
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CallbackVH, with fixes. allUsesReplacedWith need to
walk the def-use chains and invalidate all users of a
value that is replaced. SCEVs of users need to be
recalcualted even if the new value is equivalent. Also,
make forgetLoopPHIs walk def-use chains, since any
SCEV that depends on a PHI should be recalculated when
more information about that PHI becomes available.
llvm-svn: 70927
2009-05-04 22:30:44 +00:00
5036695c32
Revert r70645 for now; it's causing a variety of regressions.
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llvm-svn: 70661
2009-05-03 05:46:20 +00:00
e9a38d16fe
Convert ScalarEvolution to use CallbackVH for its internal map. This
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makes ScalarEvolution::deleteValueFromRecords, and it's code that
subtly needed to be called before ReplaceAllUsesWith, unnecessary.
It also makes ValueDeletionListener unnecessary.
llvm-svn: 70645
2009-05-02 21:19:20 +00:00
c27345f0b4
Tell ScalarEvolution that the loop is being deleted before actually
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deleting it. This will let ScalarEvolution be more complete about
updating its records.
llvm-svn: 70632
2009-05-02 17:29:26 +00:00
0bddac16a8
Rename ScalarEvolution's getIterationCount to getBackedgeTakenCount,
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to more accurately describe what it does. Expand its doxygen comment
to describe what the backedge-taken count is and how it differs
from the actual iteration count of the loop. Adjust names and
comments in associated code accordingly.
llvm-svn: 65382
2009-02-24 18:55:53 +00:00
e669884749
Preserve the DominanceFrontier analysis in the LoopDeletion pass.
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llvm-svn: 65359
2009-02-24 01:21:53 +00:00
e591411fd6
LoopDeletion needs to inform ScalarEvolution when a loop is deleted,
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so that ScalarEvolution doesn't hang onto a dangling Loop*, which
could be a problem if another Loop happens to get allocated at the
same address.
llvm-svn: 65323
2009-02-23 17:10:29 +00:00
7f39e2d85a
Change create*Pass factory functions to return Pass* instead of
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LoopPass*.
- Although less precise, this means they can be used in clients
without RTTI (who would otherwise need to include LoopPass.h, which
eventually includes things using dynamic_cast). This was the
simplest solution that presented itself, but I am happy to use a
better one if available.
llvm-svn: 58010
2008-10-22 23:32:42 +00:00
a79db30d28
Tidy up several unbeseeming casts from pointer to intptr_t.
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llvm-svn: 55779
2008-09-04 17:05:41 +00:00
abd8f41c81
Use use_empty() instead of getNumUses(), avoiding a use list traversal.
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llvm-svn: 52651
2008-06-23 23:23:49 +00:00
f4aece5976
Remove debugging code.
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llvm-svn: 51666
2008-05-29 08:15:48 +00:00
ad5f211b48
Clean ups for loop deletion based on Chris' feedback.
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Also, use SCEV to determine the trip count of the loop, which is more powerful
and accurate that Loop::getTripCount.
llvm-svn: 51179
2008-05-16 04:32:45 +00:00
d78c400b5b
Clean up the use of static and anonymous namespaces. This turned up
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several things that were neither in an anonymous namespace nor static
but not intended to be global.
llvm-svn: 51017
2008-05-13 00:00:25 +00:00
829046b0b4
Improve pass documentation and comments.
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Patch by Matthijs Kooijman!
llvm-svn: 50861
2008-05-08 17:46:35 +00:00
0e1ab4a9be
We need to update PHIs containing the exiting block, not the exit block. We really should come up with better names for these.
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llvm-svn: 50770
2008-05-06 20:55:16 +00:00
0ced13ccd9
This condition got inverted accidentally.
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llvm-svn: 50473
2008-04-30 07:16:33 +00:00
e674600266
A lot of cleanups and documentation improvements, as well as a few corner case fixes. Most
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of this was suggested by Chris.
llvm-svn: 50441
2008-04-29 20:59:33 +00:00
2306a1e098
Rename DeadLoopElimination to LoopDeletion, part 2.
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llvm-svn: 50437
2008-04-29 20:06:54 +00:00
e9f05bd1f0
Rename DeadLoopElimination to LoopDeletion, part one.
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llvm-svn: 50436
2008-04-29 19:58:07 +00:00
Dan Gohman