c5f22a7815
PR9634: Don't unconditionally tell the AliasSetTracker that the PreheaderLoad
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is equivalent to any other relevant value; it isn't true in general.
If it is equivalent, the LoopPromoter will tell the AST the equivalence.
Also, delete the PreheaderLoad if it is unused.
Chris, since you were the last one to make major changes here, can you check
that this is sane?
llvm-svn: 129049
2011-04-07 01:35:06 +00:00
57ee5a5db7
remove postdom frontiers, because it is dead. Forward dom frontiers are
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still used by RegionInfo :(
llvm-svn: 128943
2011-04-05 21:57:17 +00:00
c4f0ab397c
Revert r128140 for now.
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llvm-svn: 128149
2011-03-23 15:51:12 +00:00
9ed8d93f55
A global variable with internal linkage where all uses are in one function and whose address is never taken is a non-escaping local object and can't alias anything else.
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llvm-svn: 128140
2011-03-23 02:19:48 +00:00
f6b01ff422
Propagate SCEV no-wrap flags whenever possible.
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This needs review.
llvm-svn: 127638
2011-03-15 00:37:00 +00:00
2afa325811
When SCEV can determine the loop test is X < X, set ExactBECount=0.
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When ExactBECount is a constant, use it for MaxBECount.
When MaxBECount cannot be computed, replace it with ExactBECount.
Fixes PR9424.
llvm-svn: 127342
2011-03-09 17:29:58 +00:00
4f23f2be15
teach SCEV that the scale and addition of an inbounds gep don't NSW.
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This fixes a FIXME in scev-aa.ll (allowing a new no-alias result) and
generally makes things more precise.
llvm-svn: 125449
2011-02-13 03:14:49 +00:00
7936a8a488
Per discussion with Dan G, inbounds geps *certainly* can have
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unsigned overflow (e.g. "gep P, -1"), and while they can have
signed wrap in theoretical situations, modelling an AddRec as
not having signed wrap is going enough for any case we can
think of today. In the future if this isn't enough, we can
revisit this. Modeling them as having NUW isn't causing any
known problems either FWIW.
llvm-svn: 125410
2011-02-11 21:43:33 +00:00
4deda530c2
Add another rdar number.
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llvm-svn: 124125
2011-01-24 17:54:01 +00:00
d4192f71b5
Simplify some code with no functionality change. Make the test a lot more
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robust against smarter optimizations, using the power of FileCheck.
llvm-svn: 124081
2011-01-23 20:06:05 +00:00
bc98f5b78e
Use value ranges to fold ext(trunc) in SCEV when possible.
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llvm-svn: 124062
2011-01-23 06:20:19 +00:00
f07426b40d
Implement requiredTransitive
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The PassManager did not implement the transitivity of requiredTransitive. This
was unnoticed since 2006.
llvm-svn: 123942
2011-01-20 21:03:22 +00:00
5c901f3489
Similarly, analyze truncate through multiply.
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llvm-svn: 123842
2011-01-19 18:56:00 +00:00
5143f0f09b
Add a missed SCEV fold that is required to continue analyzing the IR produced
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by indvars through the scev expander.
trunc(add x, y) --> add(trunc x, y). Currently SCEV largely folds the other way
which is probably wrong, but preserved to minimize churn. Instcombine doesn't
do this fold either, demonstrating a missed optz'n opportunity on code doing
add+trunc+add.
llvm-svn: 123838
2011-01-19 16:59:46 +00:00
e9ea75e3fc
Add a missing SCEV simplification sext(zext x) --> zext x.
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llvm-svn: 123832
2011-01-19 15:56:12 +00:00
44da55b7be
Teach BasicAA to return PartialAlias in cases where both pointers
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are pointing to the same object, one pointer is accessing the entire
object, and the other is access has a non-zero size. This prevents
TBAA from kicking in and saying NoAlias in such cases.
llvm-svn: 123775
2011-01-18 21:16:06 +00:00
31bb4c5811
Revert the testcase from the previous reverted commit.
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llvm-svn: 123227
2011-01-11 09:20:44 +00:00
1032965cbe
add a testcase I missed in previous commit.
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llvm-svn: 123143
2011-01-09 23:52:31 +00:00
10223a3fbf
teach SCEV analysis of PHI nodes that PHI recurences formed
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with GEP instructions are always NUW, because PHIs cannot wrap
the end of the address space.
llvm-svn: 123105
2011-01-09 02:28:48 +00:00
a337f5ec5c
reduce indentation. Print <nuw> and <nsw> when dumping SCEV AddRec's
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that have the bit set.
llvm-svn: 123104
2011-01-09 02:16:18 +00:00
16e42128c2
fix rdar://8813415 - a miscompilation of 164.gzip that loop-idiom
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exposed. It turns out to be a latent bug in basicaa, scary.
llvm-svn: 122772
2011-01-03 21:03:33 +00:00
12fa3c6a94
filecheckize
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llvm-svn: 122771
2011-01-03 21:01:26 +00:00
189508c4c5
-enable-tbaa is on by default now.
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llvm-svn: 121945
2010-12-16 02:53:48 +00:00
e1a17a3473
Make memcpyopt TBAA-aware.
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llvm-svn: 121944
2010-12-16 02:51:19 +00:00
0a2c416894
Move Sub simplifications and additional Add simplifications out of
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instcombine and into InstructionSimplify.
llvm-svn: 121861
2010-12-15 14:07:39 +00:00
c4bf5cac9f
Reapply r121520, PartialAlias implementation for BasicAA, now that
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memdep is updated to handle it.
llvm-svn: 121725
2010-12-13 22:50:24 +00:00
39de62348f
Revert r121520, which may have introduced miscompilations.
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llvm-svn: 121573
2010-12-10 21:48:28 +00:00
041f74e762
Implement PartialAlias checking in BasicAA.
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llvm-svn: 121520
2010-12-10 20:47:03 +00:00
d513faf41f
remove fixme comment too.
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llvm-svn: 120493
2010-11-30 23:25:01 +00:00
370797a1fb
check in *all* files. This is now handled by my previous DSE commit.
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llvm-svn: 120492
2010-11-30 23:23:59 +00:00
6ea8a947e8
test: Check the feature 'loadable_module' with load modules in %llvmshlibdir.
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%llvmshlibdir should be 'bin' on Cygming.
llvm-svn: 120282
2010-11-29 07:58:32 +00:00
22e0e1cecb
Delete unneeded ssp attributes.
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llvm-svn: 118836
2010-11-11 21:08:46 +00:00
dcdfd8dd24
TBAA-enable ArgumentPromotion.
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llvm-svn: 118804
2010-11-11 18:09:32 +00:00
0cc4c7516e
Make Sink tbaa-aware.
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llvm-svn: 118788
2010-11-11 16:21:47 +00:00
3cb92d809b
Add a testcase which demonstrates alias analysis pass precedence.
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llvm-svn: 118755
2010-11-11 01:03:30 +00:00
2e8ca44b81
Fully invalidate cached results when a prior query's size or
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type is insufficient for, or incompatible with, the current query.
llvm-svn: 118721
2010-11-10 21:45:11 +00:00
e3467a7687
Teach FunctionAttrs about the VAArg instruction.
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llvm-svn: 118627
2010-11-09 20:17:38 +00:00
2a9221793a
Add a testcase for a call which BasicAA says only accesses memory through
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its arguments and which TBAA says doesn't write to memory.
llvm-svn: 118439
2010-11-08 20:20:11 +00:00
2cd1fd4a82
Make FunctionAttrs TBAA-aware.
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llvm-svn: 118417
2010-11-08 17:12:04 +00:00
15a43965ac
Teach memdep to use pointsToConstantMemory to determine that loads
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from constant memory don't alias any stores.
llvm-svn: 117636
2010-10-29 01:14:04 +00:00
c16d9afe04
Add a basic testcase for TBAA-aware DSE.
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llvm-svn: 117632
2010-10-29 00:54:02 +00:00
55a028680c
Add some comments.
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llvm-svn: 116957
2010-10-20 22:04:02 +00:00
408beac597
Don't pass the raw invalid pointer used to represent conflicting
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TBAA information to AliasAnalysis.
llvm-svn: 116751
2010-10-18 21:28:00 +00:00
fe8abf88a0
Add a basic testcase for TBAA-aware LICM.
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llvm-svn: 116745
2010-10-18 21:00:09 +00:00
f7a5e20372
Run tbaa before basicaa, since that's how it's expected to be used.
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llvm-svn: 116731
2010-10-18 18:45:59 +00:00
33fcde9b9c
Make TypeBasedAliasAnalysis default to doing nothing, with a command-line
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option to enable it.
llvm-svn: 116722
2010-10-18 18:17:47 +00:00
02538ac4d3
Make BasicAliasAnalysis a normal AliasAnalysis implementation which
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does normal initialization and normal chaining. Change the default
AliasAnalysis implementation to NoAlias.
Update StandardCompileOpts.h and friends to explicitly request
BasicAliasAnalysis.
Update tests to explicitly request -basicaa.
llvm-svn: 116720
2010-10-18 18:04:47 +00:00
65eb03ed6b
Add a simple testcase for tbaa.
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llvm-svn: 116272
2010-10-11 23:54:13 +00:00
0aea752f6d
Remove PointerTracking tests.
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llvm-svn: 115072
2010-09-29 19:20:35 +00:00
ab3a128582
PR7959: Handle negative scales in GEPs correctly in BasicAA for non-64-bit
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targets.
llvm-svn: 114015
2010-09-15 20:08:03 +00:00
bb451461ec
remove some noise from tests.
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llvm-svn: 112889
2010-09-02 22:35:33 +00:00
7983340465
Fix constant-over-index.ll test on windows.
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llvm-svn: 112483
2010-08-30 15:08:02 +00:00
3decde9305
refix PR1143 by making basicaa analyze zexts of indices aggresively,
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which I broke with a recent patch.
llvm-svn: 111452
2010-08-18 23:09:49 +00:00
a25c05ed15
fix a buggy test
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llvm-svn: 111354
2010-08-18 04:55:12 +00:00
a33edcb56c
fix PR7589: In brief:
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gep P, (zext x) != gep P, (sext x)
DecomposeGEPExpression was getting this wrong, confusing
basicaa.
llvm-svn: 111352
2010-08-18 04:28:19 +00:00
c8e38eb60b
filecheckize and detrivialize.
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llvm-svn: 111350
2010-08-18 04:25:43 +00:00
f7495f286a
When analyzing loop exit conditions combined with and and or, don't
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make any assumptions about when the two conditions will agree on when
to permit the loop to exit. This fixes PR7845.
llvm-svn: 110758
2010-08-11 00:12:36 +00:00
7fbe6cb429
RegionInfo: Do not assert if a BB is not part of the dominance tree.
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llvm-svn: 110665
2010-08-10 09:54:35 +00:00
e68958fcdf
Implement a proper getModRefInfo for va_arg.
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llvm-svn: 110458
2010-08-06 18:24:38 +00:00
884dd752c3
Implement AccessesArguments checking in the two-callsite form
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of BasicAA::getModRefInfo. This allows BasicAA to say that two
memset calls to non-aliasing memory locations don't interfere.
llvm-svn: 110393
2010-08-05 23:34:50 +00:00
26ef7c7ab7
Fix memdep's code for reasoning about dependences between two calls. A Ref
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response from getModRefInfo is not useful here. Instead, check for identical
calls only in the NoModRef case.
Reapply r110270, and strengthen it to compensate for the memdep changes.
When both calls are readonly, there is no dependence between them.
llvm-svn: 110382
2010-08-05 22:09:15 +00:00
554b012f67
Revert r110270 for now. It appears to uncover a memdep bug.
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llvm-svn: 110293
2010-08-05 00:43:10 +00:00
109561845b
The trouble with testing for "ModRef" and "NoModRef" is that
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one is a suffix of the other, and FileCheck accepts superstrings.
Adjust the output to avoid this problem.
llvm-svn: 110280
2010-08-04 23:37:55 +00:00
bd33dab633
The two-callsite form of AliasAnalysis::getModRefInfo is documented
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to return Ref if the left callsite only reads memory read or written
by the right callsite; fix BasicAliasAnalysis to implement this.
Add AliasAnalysisEvaluator support for testing the two-callsite
form of getModRefInfo.
llvm-svn: 110270
2010-08-04 22:56:29 +00:00
336734aca6
Add new RegionInfo pass.
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The RegionInfo pass detects single entry single exit regions in a function,
where a region is defined as any subgraph that is connected to the remaining
graph at only two spots.
Furthermore an hierarchical region tree is built.
Use it by calling "opt -regions analyze" or "opt -view-regions".
llvm-svn: 109089
2010-07-22 07:46:31 +00:00
00ef93258a
Remove interprocedural-basic-aa and associated code. The AliasAnalysis
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interface needs implementations to be consistent, so any code which
wants to support different semantics must use a different interface.
It's not currently worthwhile to add a new interface for this new
concept.
Document that AliasAnalysis doesn't support cross-function queries.
llvm-svn: 107776
2010-07-07 14:27:09 +00:00
84f90a387d
Remove context sensitivity concerns from interprocedural-basic-aa, and
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make it more aggressive in cases where both pointers are known to live
in the same function.
llvm-svn: 107420
2010-07-01 20:08:40 +00:00
c0cca7fdda
Revert the part of r107257 which introduced new logic for using
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nsw and nuw flags from IR Instructions. On further consideration,
this isn't valid.
llvm-svn: 107298
2010-06-30 17:27:11 +00:00
725ed0364b
Add a testcase for scev-aa's new capability.
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llvm-svn: 107258
2010-06-30 07:17:47 +00:00
9bbd007f15
Add a few more interesting testcases.
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llvm-svn: 107177
2010-06-29 18:17:11 +00:00
0824affeff
Add an Intraprocedural form of BasicAliasAnalysis, which aims to
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properly handles instructions and arguments defined in different
functions, or across recursive function iterations.
llvm-svn: 107109
2010-06-29 00:50:39 +00:00
7c34ece501
Fix Value::stripPointerCasts and BasicAA to avoid trouble on
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code in unreachable blocks, which have have use-def cycles.
This fixes PR7514.
llvm-svn: 107071
2010-06-28 21:16:52 +00:00
f820bd327d
Allow "exhaustive" trip count evaluation on phi nodes with all
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constant operands.
llvm-svn: 106537
2010-06-22 13:15:46 +00:00
866971ed3d
Fix ScalarEvolution's "exhaustive" trip count evaluation code to avoid
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assuming that loops are in canonical form, as ScalarEvolution doesn't
depend on LoopSimplify itself. Also, with indirectbr not all loops can
be simplified. This fixes PR7416.
llvm-svn: 106389
2010-06-19 14:17:24 +00:00
24ceda8eb0
Revert r106304 (105548 and friends), which are the SCEVComplexityCompare
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optimizations. There is still some nondeterminism remaining.
llvm-svn: 106306
2010-06-18 19:54:20 +00:00
4c807fca97
Reapply 105540, 105542, and 105548, and revert r105732.
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llvm-svn: 106304
2010-06-18 19:26:04 +00:00
e16d569932
Workaround SCEV non-determinism on this test, for now, to get buildbots back to
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green. Dan, please revert this once the real problem is fixed.
llvm-svn: 105732
2010-06-09 17:54:40 +00:00
70910a6ab6
Optimize ScalarEvolution's SCEVComplexityCompare predicate: don't go
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scrounging through SCEVUnknown contents and SCEVNAryExpr operands;
instead just do a simple deterministic comparison of the precomputed
hash data.
Also, since this is more precise, it eliminates the need for the slow
N^2 duplicate detection code.
llvm-svn: 105540
2010-06-07 19:06:13 +00:00
d07d2f9774
Add a comment to this test.
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llvm-svn: 102387
2010-04-26 21:37:43 +00:00
f33bac3afe
ScalarEvolution support for <= and >= loops.
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Also, generalize ScalarEvolutions's min and max recognition to handle
some new forms of min and max that this change makes more common.
llvm-svn: 102234
2010-04-24 03:09:42 +00:00
126a58e084
fix some failures my callgraph dump format change broke.
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llvm-svn: 102197
2010-04-23 18:38:40 +00:00
acd700a24b
Don't attempt to analyze values which are obviously undef. This fixes some
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assertion failures in extreme cases.
llvm-svn: 102042
2010-04-22 01:35:11 +00:00
6635bb26a6
Generalize ScalarEvolution's PHI analysis to handle loops that don't
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have preheaders or dedicated exit blocks, as clients may not otherwise
need to run LoopSimplify.
llvm-svn: 101030
2010-04-12 07:49:36 +00:00
cb45bd9cb3
Pointers to zero-sized objects don't point to overlapping objects.
...
llvm-svn: 100789
2010-04-08 18:11:50 +00:00
3ae2dd2ba5
add newlines at the end of files.
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llvm-svn: 100705
2010-04-07 22:53:17 +00:00
c576ee9040
Reapply address space patch after fixing an issue in MemCopyOptimizer.
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Added support for address spaces and added a isVolatile field to memcpy, memmove, and memset,
e.g., llvm.memcpy.i32(i8*, i8*, i32, i32) -> llvm.memcpy.p0i8.p0i8.i32(i8*, i8*, i32, i32, i1)
llvm-svn: 100304
2010-04-04 03:10:48 +00:00
999c1b927b
Revert r100191 since it breaks objc in clang
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llvm-svn: 100199
2010-04-02 18:43:02 +00:00
a972ab8564
Reapply address space patch after fixing an issue in MemCopyOptimizer.
...
Added support for address spaces and added a isVolatile field to memcpy, memmove, and memset,
e.g., llvm.memcpy.i32(i8*, i8*, i32, i32) -> llvm.memcpy.p0i8.p0i8.i32(i8*, i8*, i32, i32, i1)
llvm-svn: 100191
2010-04-02 18:04:15 +00:00
6f7fd28824
Revert Mon Ping's change 99928, since it broke all the llvm-gcc buildbots.
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llvm-svn: 99948
2010-03-30 22:27:04 +00:00
7460571381
Added support for address spaces and added a isVolatile field to memcpy, memmove, and memset,
...
e.g., llvm.memcpy.i32(i8*, i8*, i32, i32) -> llvm.memcpy.p0i8.p0i8.i32(i8*, i8*, i32, i32, i1)
A update of langref will occur in a subsequent checkin.
llvm-svn: 99928
2010-03-30 20:55:56 +00:00
69451a0950
Avoid analyzing instructions in blocks not reachable from the entry block.
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They are lots of trouble, and they don't matter. This fixes PR6559.
llvm-svn: 98103
2010-03-09 23:46:50 +00:00
7d2c1592f3
remove andersen's tests.
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llvm-svn: 97490
2010-03-01 20:23:15 +00:00
6b1e2a829d
Teach ScalarEvolution how to compute a tripcount for a loop with
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true or false as its exit condition. These are usually eliminated by
SimplifyCFG, but the may be left around during a pass which wishes
to preserve the CFG.
llvm-svn: 96683
2010-02-19 18:12:07 +00:00
80386c10d4
-disable-output is no longer needed with -analyze.
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llvm-svn: 94574
2010-01-26 19:25:59 +00:00
51aaf02821
Fix the the ceiling-division used in computing the MaxBECount so that it doesn't
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have trouble with an intermediate add overflowing. Also, be more conservative
about the case where the induction variable in an SLT loop exit can step past
the RHS of the SLT and overflow in a single step.
Make getSignedRange more aggressive, to recover for some common cases which
the above fixes pessimized.
This addresses rdar://7561161.
llvm-svn: 94512
2010-01-26 04:40:18 +00:00
b478d3e0fc
Fix PR6047
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Nodes that had children outside of the post dominator tree (infinite loops)
where removed from the post dominator tree. This seems to be wrong. Leave them
in the tree.
llvm-svn: 93633
2010-01-16 13:38:07 +00:00
bc694918cc
Use WriteAsOperand instead of getName() to print loop header names,
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so that unnamed blocks are handled.
llvm-svn: 93059
2010-01-09 18:17:45 +00:00
fb4193625a
Delete useless trailing semicolons.
...
llvm-svn: 92740
2010-01-05 17:55:26 +00:00
850a3cd905
gvn is optimizing this better now.
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llvm-svn: 90696
2009-12-06 04:16:05 +00:00
03f90ab0a9
Add a comment about A[i+(j+1)].
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llvm-svn: 90185
2009-12-01 01:38:10 +00:00
Eli Friedman