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Author SHA1 Message Date
Owen Anderson
0eb355ab6b More cleanups of my JumpThreading transforms, including extracting some duplicated code into a helper function. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112634 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-31 20:26:04 +00:00
Owen Anderson
9ba353627a Add an RAII helper to make cleanup of the RecursionSet more fool-proof. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112628 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-31 19:24:27 +00:00
Owen Anderson
869a144f4e Only try to clean up the current block if we changed that block already. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112625 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-31 18:55:52 +00:00
Owen Anderson
c1bdac66ff Refactor my fix for PR5652 to terminate the predecessor lookups after the first failure. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112620 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-31 18:48:48 +00:00
Owen Anderson
7c37f6d2d9 Don't perform an extra traversal of the function just to do cleanup. We can safely simplify instructions after each block has been processed without worrying about iterator invalidation. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112594 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-31 07:55:56 +00:00
Owen Anderson
25e9405272 Rename ValuePropagation to a more descriptive CorrelatedValuePropagation. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112591 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-31 07:48:34 +00:00
Owen Anderson
7aff1cd038 Rename file to something more descriptive. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112590 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-31 07:41:39 +00:00
Owen Anderson
cb21190cbd More Chris-inspired JumpThreading fixes: use ConstantExpr to correctly constant-fold undef, and be more careful with its return value. 
This actually exposed an infinite recursion bug in ComputeValueKnownInPredecessors which theoretically already existed (in JumpThreading's
handling of and/or of i1's), but never manifested before.  This patch adds a tracking set to prevent this case.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112589 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-31 07:36:34 +00:00
Owen Anderson
49998ce46a Fix a typo. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112560 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-30 23:59:30 +00:00
Owen Anderson
a081d15b84 Cleanups suggested by Chris. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112553 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-30 23:34:17 +00:00
Owen Anderson
327ca7bec2 Re-apply r112539, being more careful to respect the return values of the constant folding methods. Additionally, 
use the ConstantExpr::get*() methods to simplify some constant folding.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112550 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-30 23:22:36 +00:00
Owen Anderson
f523b3e087 Add statistics to evaluate this pass. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112545 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-30 22:45:55 +00:00
Owen Anderson
d930f205db Revert r112539. It accidentally introduced a miscompilation. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112543 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-30 22:33:41 +00:00
Owen Anderson
1e35610f20 Fixes and cleanups pointed out by Chris. In general, be careful to handle 0 results from ComputeValueKnownInPredecessors 
(indicating undef), and re-use existing constant folding APIs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112539 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-30 22:07:52 +00:00
Chris Lattner
4455608818 rewrite DwarfEHPrepare to use SSAUpdater to promote its allocas 
instead of PromoteMemToReg.  This allows it to stop using DF and DT,
eliminating a computation of DT and DF from clang -O3.  Clang is now
down to 2 runs of DomFrontier.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112457 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 19:54:28 +00:00
Chris Lattner
cb7f653422 two changes: 1) make AliasSet hold the list of call sites with an 
assertingvh so we get a violent explosion if the pointer dangles.

2) Fix AliasSetTracker::deleteValue to remove call sites with
   by-pointer comparisons instead of by-alias queries.  Using
   findAliasSetForCallSite can cause alias sets to get merged
   when they shouldn't, and can also miss alias sets when the
   call is readonly.

#2 fixes PR6889, which only repros with a .c file :(


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112452 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 18:42:23 +00:00
Chris Lattner
0de5cad74d LICM does get dead instructions input to it. Instead of sinking them 
out of loops, just delete them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112451 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 18:22:25 +00:00
Chris Lattner
d9a5daeb77 use moveBefore instead of remove+insert, it avoids some 
symtab manipulation, so its faster (in addition to being
more elegant)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112450 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 18:18:40 +00:00
Chris Lattner
1b9c848d0a revert 112448 for now. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112449 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 18:11:16 +00:00
Chris Lattner
bb07ed3bb5 optimize LICM::hoist to use moveBefore. Correct its updating 
of AST to remove the hoisted instruction from the AST, since it
is no longer in the loop.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112448 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 18:03:33 +00:00
Chris Lattner
98917503c7 fix some bugs (found by inspection) where LICM would not update 
LICM correctly.  When sinking an instruction, it should not add
entries for the sunk instruction to the AST, it should remove
the entry for the sunk instruction.  The blocks being sunk to
are not in the loop, so their instructions shouldn't be in the
AST (yet)!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112447 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 18:00:00 +00:00
Chris Lattner
4282e32712 rework the ownership of subloop alias information: instead of 
keeping them around until the pass is destroyed, keep them
around a) just when useful (not for outer loops) and b) destroy
them right after we use them.  This should reduce memory use
and fixes potential bugs where a loop is deleted and another
loop gets allocated to the same address.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112446 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 17:46:00 +00:00
Chris Lattner
ea1092374c apparently unswitch had the same "Feature". Stop its 
claims that it preserves domfrontier if it doesn't really.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112445 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 17:23:19 +00:00
Chris Lattner
937790195e now that loop passes don't use DomFrontier, there is no reason 
for the unroller to pretend it supports updating it.  It still
has a horrible hack for DomTree.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112444 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 17:21:35 +00:00
Dan Gohman
4f7e18dee3 Optionally rerun dedicated-register filtering after applying 
other filtering techniques, as those may allow it to filter
out more obviously unprofitable candidates.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112441 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 16:39:22 +00:00
Dan Gohman
25608f7f4b Fix several areas in LSR to do a better job keeping the main 
LSRInstance data structures up to date. This fixes some
pessimizations caused by stale data which will be exposed
in an upcoming change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112440 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 16:32:54 +00:00
Dan Gohman
4aa5c2e90f Refactor the three main groups of code out of 
NarrowSearchSpaceUsingHeuristics into separate functions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112439 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 16:09:42 +00:00
Dan Gohman
e39a47c5b3 Delete a bogus check. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112438 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 15:30:29 +00:00
Dan Gohman
6a83271532 Add some comments. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112437 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 15:27:08 +00:00
Dan Gohman
3902f9fca8 Move this debug output into GenerateAllReuseFormula, to declutter 
the high-level logic.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112436 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 15:21:38 +00:00
Dan Gohman
a7d0d64b7a Delete an unused declaration. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112435 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 15:19:11 +00:00
Dan Gohman
46fd7a6ef8 Do one lookup instead of two. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112434 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 15:18:49 +00:00
Chris Lattner
e418ac832c licm preserves the cfg, it doesn't have to explicitly say it 
preserves domfrontier.  It does preserve AA though.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112419 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 07:02:56 +00:00
Chris Lattner
44e2bd31f1 now that it doesn't use the PromoteMemToReg function, LICM doesn't 
require DomFrontier.  Dropping this doesn't actually save any runs
of the pass though.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112418 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 06:49:44 +00:00
Chris Lattner
e488064922 completely rewrite the memory promotion algorithm in LICM. 
Among other things, this uses SSAUpdater instead of 
PromoteMemToReg.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112417 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 06:43:52 +00:00
Chris Lattner
63a75c13b1 use getUniqueExitBlocks instead of a manual set. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112412 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 05:12:21 +00:00
Chris Lattner
a6a36f59b4 reimplement LICM::sink to use SSAUpdater instead of PromoteMemToReg. 
This leads to much simpler code.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112410 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 04:55:06 +00:00
Chris Lattner
abd2a75900 remove dead proto 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112408 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 04:53:24 +00:00
Chris Lattner
d7bc19dfee reduce indentation in LICM::sink by using early exits, use 
getUniqueExitBlocks instead of getExitBlocks and a manual
set to eliminate dupes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112405 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 04:28:20 +00:00
Chris Lattner
dc1ceb370a modernize this pass a bit: use efficient set/map and reduce indentation. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112404 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-29 04:23:04 +00:00
Chris Lattner
5f88af5376 remove the ABCD and SSI passes. They don't have any clients that 
I'm aware of, aren't maintained, and LVI will be replacing their value.
nlewycky approved this on irc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112355 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-28 03:51:24 +00:00
Chris Lattner
b188a3789e squish dead code. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112350 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-28 03:21:03 +00:00
Benjamin Kramer
6cfabc7974 Update CMake build. Add newline at end of file. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112332 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-28 00:11:12 +00:00
Owen Anderson
a0b59f6bd2 Add a prototype of a new peephole optimizing pass that uses LazyValue info to simplify PHIs and select's. 
This pass addresses the missed optimizations from PR2581 and PR4420.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112325 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-27 23:31:36 +00:00
Owen Anderson
fc2fb17fb7 Fix typos in comments. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112286 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-27 20:32:56 +00:00
Owen Anderson
660cab32fe Use LVI to eliminate conditional branches where we've tested a related condition previously. Update tests for this change. 
This fixes PR5652.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112270 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-27 17:12:29 +00:00
Owen Anderson
62efd3b385 Make JumpThreading smart enough to properly thread StrSwitch when it's compiled with clang++. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112198 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-26 17:40:24 +00:00
Chris Lattner
aafe626c7f remove some llvmcontext arguments that are now dead post-refactoring. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112104 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-25 23:00:45 +00:00
Owen Anderson
53c36c41ae Turn LVI on, previously detected failures should be fixed now. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111923 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-24 17:21:18 +00:00
Owen Anderson
b6ad691ad7 Turn LVI back off, I have a testcase now. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111834 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-23 19:59:27 +00:00