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
Anders Carlsson