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88 Commits

Author SHA1 Message Date
Owen Anderson 9517943d11 It is possible to try to merge a not-constant with a constantrage, when dealing with ptrtoint ConstantExpr's. 
Unfortunately, the only testcase I have for this is huge and doesn't reduce well because the error is
sensitive to iteration-order issues, since the problem only occurs when merging values in a particular order.

llvm-svn: 112489
 2010-08-30 17:03:45 +00:00
Owen Anderson 38f6b7fe3b Improve the precision of getConstant(). 
llvm-svn: 112323
 2010-08-27 23:29:38 +00:00
Owen Anderson 6ebbd92380 Use LVI to eliminate conditional branches where we've tested a related condition previously. Update tests for this change. 
This fixes PR5652.

llvm-svn: 112270
 2010-08-27 17:12:29 +00:00
Owen Anderson 4afea9e3c6 In the default address space, any GEP off of null results in a trap value if you try to load it. Thus, 
any load in the default address space that completes implies that the base value that it GEP'd from
was not null.

llvm-svn: 112015
 2010-08-25 01:16:47 +00:00
Owen Anderson a10000006e NULL loads are only invalid in the default address space. 
llvm-svn: 111972
 2010-08-24 22:00:55 +00:00
Owen Anderson b695c83de9 Add support for inferring values for the default cases of switches. 
llvm-svn: 111971
 2010-08-24 21:59:42 +00:00
Owen Anderson da34de1599 Add support for inferring that a load from a pointer implies that it is not null. 
llvm-svn: 111959
 2010-08-24 20:47:29 +00:00
Owen Anderson c62f704576 Don't assume that all constants with integer types are ConstantInts. 
llvm-svn: 111906
 2010-08-24 07:55:44 +00:00
Owen Anderson 80d19f0905 Use ConstantRange to propagate information through value definitions. 
llvm-svn: 111425
 2010-08-18 21:11:37 +00:00
Owen Anderson 208636fa33 Inform LazyValueInfo whenever a block is deleted, to avoid dangling pointer issues. 
llvm-svn: 111382
 2010-08-18 18:39:01 +00:00
Owen Anderson fa7d44687f Fix another iterator invalidation that caused a *really* nasty miscompilation in 403.gcc. 
llvm-svn: 111210
 2010-08-16 23:42:33 +00:00
Owen Anderson 7b974a45db Fix a subtle use-after-free issue. 
llvm-svn: 110863
 2010-08-11 22:36:04 +00:00
Owen Anderson 0bd61240e9 Improve indentation. 
llvm-svn: 110778
 2010-08-11 04:24:25 +00:00
Owen Anderson 5f1dd0967d Now that we're using ConstantRange to represent potential values, make use of that represenation to 
create constraints from comparisons other than eq/neq.

llvm-svn: 110742
 2010-08-10 23:20:01 +00:00
Owen Anderson 185fe00633 Switch over to using ConstantRange to track integral values. 
llvm-svn: 110714
 2010-08-10 20:03:09 +00:00
Owen Anderson 8afac043fb Add ConstantRange information to the debugging output. 
llvm-svn: 110598
 2010-08-09 20:50:46 +00:00
Owen Anderson 0f306a45ad Add the beginnings of infrastructure for range tracking. 
llvm-svn: 110388
 2010-08-05 22:59:19 +00:00
Owen Anderson c3a1413ea1 Split the tag and value members of LVILatticeVal in preparation for expanding the lattice to something that won't fit in two bits. 
llvm-svn: 110383
 2010-08-05 22:10:46 +00:00
Owen Anderson c1561b8400 Add an initial implementation of PHI translation for LazyValueInfo. This involves rolling back some 
of my earlier data structure improvements until I can ensure that there are no iterator invalidation problems.

llvm-svn: 109935
 2010-07-30 23:59:40 +00:00
Owen Anderson e4a0ab69d2 Revert my last two patches to LVI, which recent changes have exposed a miscompilation in. 
llvm-svn: 109889
 2010-07-30 20:56:07 +00:00
Owen Anderson a44f49f189 Pass the queried value by argument rather than in a member, in preparation for supporting PHI translation. 
llvm-svn: 109701
 2010-07-28 23:50:08 +00:00
Owen Anderson 6982dd4e1f Get rid of LVIQuery as a distinct data structure, so that we don't have to initialize a new set of maps on every query. 
llvm-svn: 109679
 2010-07-28 22:07:25 +00:00
Owen Anderson aac5a72139 Rearrange several datastructures in LazyValueInfo to improve compile time. 
This is still not perfect, but better than it was before.

llvm-svn: 109563
 2010-07-27 23:58:11 +00:00
Owen Anderson aa7f66ba67 Add an initial implementation of LazyValueInfo updating for JumpThreading. Disabled for now. 
llvm-svn: 109424
 2010-07-26 18:48:03 +00:00
Owen Anderson a57b97e7e7 Fix batch of converting RegisterPass<> to INTIALIZE_PASS(). 
llvm-svn: 109045
 2010-07-21 22:09:45 +00:00
David Greene 37e9809294 Convert debug messages to use dbgs(). Generally this means 
s/errs/dbgs/g except for certain special cases.

llvm-svn: 92040
 2009-12-23 20:43:58 +00:00
Chris Lattner e58c05780e typo spotted by duncan. 
llvm-svn: 88884
 2009-11-16 03:51:42 +00:00
Chris Lattner 7735878591 teach LVI to infer edge information from switch instructions. 
This allows JT to eliminate a ton of infeasible edges when
handling code like the templates in PatternMatch.h

llvm-svn: 88869
 2009-11-15 20:02:12 +00:00
Chris Lattner b0c0a0df3e fix a logic error that would cause LVI-JT to miscompile 
some conditionals

llvm-svn: 88868
 2009-11-15 20:01:24 +00:00
Chris Lattner 2c708562f5 implement the first stab at caching queries. This isn't correct 
(because the invalidation logic is missing) but LVI isn't enabled
by default anyway.

llvm-svn: 88867
 2009-11-15 20:00:52 +00:00
Chris Lattner af025d3f6e refactor a bunch of code forming the new LazyValueInfoCache 
and LVIQuery classes, no functionality change.

llvm-svn: 88866
 2009-11-15 19:59:49 +00:00
Chris Lattner 22db4b5e0c various fixes to the lattice transfer functions. 
llvm-svn: 86952
 2009-11-12 04:57:13 +00:00
Chris Lattner 565ee2f1bd Add a new getPredicateOnEdge method which returns more rich information for 
constant constraints.  Improve the LVI lattice to include inequality 
constraints.

llvm-svn: 86950
 2009-11-12 04:36:58 +00:00
Chris Lattner d5e25436a1 expose edge information and switch j-t to use it. 
llvm-svn: 86920
 2009-11-12 01:29:10 +00:00
Chris Lattner b584d1e456 move some stuff into DEBUG's and turn on lazy-value-info for 
the basic.ll testcase.

llvm-svn: 86918
 2009-11-12 01:22:16 +00:00
Chris Lattner 19019eaf00 make LazyValueInfo actually to some stuff. This isn't very tested but improves 
strswitch.

llvm-svn: 86889
 2009-11-11 22:48:44 +00:00
Chris Lattner fde1f8d0d8 stub out some LazyValueInfo interfaces, and have JumpThreading 
start using them in a trivial way when -enable-jump-threading-lvi
is passed.  enable-jump-threading-lvi will be my playground for 
awhile.

llvm-svn: 86789
 2009-11-11 02:08:33 +00:00
Chris Lattner 741c94c719 Stub out a new lazy value info pass, which will eventually 
vend value constraint information to the optimizer.

llvm-svn: 86767
 2009-11-11 00:22:30 +00:00